App Figure 9 – Observed vs Predicted Conventional Crusher
Transcript of App Figure 9 – Observed vs Predicted Conventional Crusher
SMC Test Report on Twenty Samples from Mt Todd Project Vista Gold Australia Pty Ltd
JKTech Job No. 11001 / P71 28
App Figure 9 – Observed vs Predicted Conventional Crusher Specific Energy
B 3.3 HPGRs
Validation of equation 1 for HPGRs used data from 18 different circuits (35 data sets) including laboratory, pilot and industrial scale equipment. Observed vs predicted specific energies are given in App Figure 10. The data relate to HPGRs operating with specific grinding forces typically in the range 2.5-3.5 N/mm2. The observed specific energies relate to power delivered by the roll drive shafts. Motor input power for full scale machines is expected to be 8-10% higher.
y = 0.9981x
R2 = 0.9669
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
predicted (kWh/t)
observ
ed (kW
h/t) 1
SMC Test Report on Twenty Samples from Mt Todd Project Vista Gold Australia Pty Ltd
JKTech Job No. 11001 / P71 29
App Figure 10 – Observed vs Predicted HPGR Specific Energy
B 4 WORKED EXAMPLES
A SMC Test® and Bond ball work index test were carried out on a representative ore sample. The following results were obtained:
SMC Test:
Mia = 19.4 kWh/t
Mic = 7.2 kWh/t
Mih = 13.9 kWh/t
Bond test carried out with a 150 micron closing screen:
Mib = 18.8 kWh/t
Three circuits are to be evaluated:
SABC
HPGR/ball mill
Conventional crushing/ball mill
The overall specific grinding energy to reduce a primary crusher product with a P80 of 100 mm to a final product P80 of 106 µm needs to be estimated.
B 4.1 SABC Circuit
Coarse particle tumbling mill specific energy
y = 1.0006x
R2 = 0.9514
0
0.5
1
1.5
2
2.5
3
3.5
4
0 0.5 1 1.5 2 2.5 3 3.5 4
Predicted (kWh/t)
Observ
ed (kW
h/t) 1
SMC Test Report on Twenty Samples from Mt Todd Project Vista Gold Australia Pty Ltd
JKTech Job No. 11001 / P71 30
Combining eq 2 and 4:
( )1000000/100000295.0()1000000/750295.0(100000750*4*4.19*95.0
+−+−−=aW
= 9.6 kWh/t
Fine particle tumbling mill specific energy
Combining eq 2 and 5:
( )1000000/750295.0()1000000/106295.0(750106*4*8.18
+−+−−=bW
= 8.4 kWh/t
Pebble crusher specific energy
In this circuit, it is assumed that the pebble crusher feed P80 is 52.5mm. As a rule of thumb this value can be estimated by assuming that it is 0.75 of the nominal pebble port aperture (in this case the pebble port aperture is 70mm). The pebble crusher is set to give a product P80 of 12mm. The pebble crusher feed rate is expected to be 25% of new feed tph.
Combining eq 2 and 7:
( )1000000/52500295.0()1000000/12000295.0(5250012000*4*2.7*19.1
+−+−−=cW
= 1.12 kWh/t when expressed in terms of the crusher feed rate
= 1.12 * 0.25 kWh/t when expressed in terms of the SABC circuit new feed rate
= 0.3 kWh/t of SAG mill circuit new feed
Total net comminution specific energy:
From eq 3:
WT = 9.6 + 8.4 + 0.3 kWh/t
= 18.3 kWh/t
B 4.2 HPGR/Ball Milling Circuit
In this circuit primary crusher product is reduced to a HPGR circuit feed P80 of 35 mm by closed circuit secondary crushing. The HPGR is also in closed circuit and reduces the 35 mm feed to a circuit product P80 of 4 mm. This is then fed to a closed circuit ball mill which takes the grind down to a P80 of 106 µm.
Secondary crushing specific energy
Combining eq 2 and 7:
( )1000000/100000295.0()1000000/35000295.0(10000035000*4*2.7*1
+−+−−=cW
SMC Test Report on Twenty Samples from Mt Todd Project Vista Gold Australia Pty Ltd
JKTech Job No. 11001 / P71 31
= 0.6 kWh/t
HPGR specific energy
Combining eq 2 and 8:
( )1000000/35000295.0()1000000/4000295.0(350004000*4*9.13*1
+−+−−=cW
= 2.9 kWh/t
Coarse particle tumbling mill specific energy
Combining eq 2 and 4:
( )1000000/4000295.0()1000000/750295.0(4000750*4*4.19*1
+−+−−=aW
= 4.5 kWh/t
Fine particle tumbling mill specific energy
Combining eq 2 and 5:
( )1000000/750295.0()1000000/106295.0(750106*4*8.18
+−+−−=bW
= 8.4 kWh/t
Total net comminution specific energy:
From eq 3:
WT = 4.5 + 8.4 + 0.6 + 2.9 kWh/t
= 16.4 kWh/t
B 4.3 Conventional Crushing/Ball Milling Circuit
In this circuit primary crusher product is reduced in size to P80 of 6.5 mm via a secondary/tertiary crushing circuit (closed). This is then fed to a closed circuit ball mill which grinds to a P80 of 106 µm.
Secondary/tertiary crushing specific energy
Combining eq 2 and 7:
( )1000000/100000295.0()1000000/6500295.0(1000006500*4*2.7*1
+−+−−=cW
= 1.7 kWh/t
Coarse particle tumbling mill specific energy
Combining eq 2 and 4:
SMC Test Report on Twenty Samples from Mt Todd Project Vista Gold Australia Pty Ltd
JKTech Job No. 11001 / P71 32
( )1000000/6500295.0()1000000/750295.0(6500750*4*4.19*1
+−+−−=aW
= 5.5 kWh/t
Fine particle tumbling mill specific energy
Combining eq 2 and 5:
( )1000000/750295.0()1000000/106295.0(750106*4*8.18
+−+−−=bW
= 8.4 kWh/t
Size distribution correction
( )1000000/100000295.0()1000000/6500295.0(1000006500*4*4.19*19.0
+−+−−=sW
= 0.9 kWh/t
Total net comminution specific energy:
From eq 3:
WT = 5.5 + 8.4 + 1.7 + 0.9 kWh/t
= 16.5 kWh/t
B 5 REFERENCES
Morrell, S., 2004a. Predicting the Specific Energy of Autogenous and Semi-autogenous Mills from Small Diameter Drill Core Samples. Minerals Engineering, Vol 17/3 pp 447-451
Morrell, S., 2004b. An Alternative Energy-Size Relationship To That Proposed By Bond For The Design and Optimisation Of Grinding Circuits. International Journal of Mineral Processing, 74, 133-141.
Morrell, S., 2006. Rock Characterisation for High Pressure Grinding Rolls Circuit Design, Proc International Autogenous and Semi Autogenous Grinding Technology,Vancouver, vol IV pp 267-278.
Morrell,S., 2008a, A method for predicting the specific energy requirement of comminution circuits and assessing their energy utilisation efficiency, Minerals Engineering, Vol. 21, No. 3.
Morrell,S., 2008b, Predicting the Overall Specific Energy Requirements of AG/SAG, Ball Mill and HPGR Circuits on the Basis of Small-Scale Laboratory Ore Characterisation Tests, Proceedings Procemin Conference, Santiago, Chile
Stephenson, I.;1997, The downstream effects of high pressure grinding rolls processing, PhD Thesis, Julius Kruttschnitt Mineral Research Centre, Department of Mining and Metallurgical Engineering, University of Queensland.
SMC Test Report on Twenty Samples from Mt Todd Project Vista Gold Australia Pty Ltd
JKTech Job No. 11001 / P71 33
Schonert, K., 1991. Advances in comminution fundamental, and impacts on technology. XVII International Mineral Processing Congress, Dresden, Volume 1,: pp 1-21.
Shi, F., Lambert, S., Daniel, M.J., 2006, Measurement of the effect of HPGR treating platinum ores. SAG 2006, Vancouver, 23-27 September 2006.
Report No. A13575 Part 1
APPENDIX XI
Mt Todd Variability Gold Ore Drill Core
Bond Ball Mill Work Index Determination
Details and Results
BOND BALL MILL CLOSED CIRCUIT GRINDABILITY : 106 MICROMETERS
SAMPLE IDENTITY COMPOSITE #4
CLIENT VISTA GOLD CORPORATION: MT TODD FEASIBILITY
PROJECT No A13575
DATE Jun-11
WT OF WT OF
PERIOD REVS WT OF WT OF WT WT NET WT NET WT CIRC'TING FRESH U/SIZE
OF 700 NEW OF OF OF OF LOAD FEED IN FEED
MILL mls FEED O/SIZE U/SIZE U/SIZE U/SIZE ADDED TO TO NEXT
PER REV NEXT CYCLE
(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)
1 240 1250.5 1250.5 1028.3 222.2 141.0 0.588 463 222.2 14.4
2 583 1250.5 222.2 872.0 378.5 364.1 0.624 230 378.5 24.6
3 533 1250.5 378.5 870.7 379.8 355.2 0.666 229 379.8 24.6
4 499 1250.5 379.8 890.1 360.4 335.8 0.673 247 360.4 23.4
5 496 1250.5 360.4 893.2 357.3 333.9 0.673 250 357.3 23.2
6 496 1250.5 357.3 893.2 357.3 334.1 0.674 250 357.3 23.2
Note : * = Ex grinding mill
PRODUCT IN THE FEED 6.49 (%)
BULK DENSITY 1.7864 (t/m3)
IDEAL POTENTIAL PRODUCT 357.3 (g)
AVERAGE EQUILIBRIUM CIRC LOAD 250 (%)
AVERAGE PRODUCT 0.673 (g/rev)
80 % PASSING FEED SIZE 2656 (µm)
80 % PASSING PRODUCT SIZE 80 (µm)
BOND BALL MILL WORK INDEX ( Kilowatt hours / dry tonne ) : 25.0
BOND BALL MILL GRINDABILITY TEST FEED AND PRODUCT SIZINGS
COMPOSITE #4A13575
FEED TO PERIOD No. 1 EQUILIBRIUM PRODUCTS
Size Weight Retained Passing Size Weight Retained Passing
(mm) (g) (%) (%) (mm) (g) (%) (%)
2.800 126.7 15.31 84.69 0.090 48.8 13.66 86.34
2.000 216.3 26.14 58.55 0.075 32.6 9.12 77.22
1.400 150.5 18.19 40.36 0.063 24.4 6.83 70.39
1.000 81.7 9.87 30.49 0.045 46.5 13.01 57.37
0.600 84.1 10.16 20.33 -0.045 205.0 57.37
0.300 64.5 7.79 12.53
0.150 38.3 4.63 7.90 TOTAL 357.3 100.00
0.106 11.7 1.41 6.49
-0.106 53.7 6.49 P 80 (µm) : 80
TOTAL 827.5 100.00
F 80 (µm) : 2656
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
10 100 1000 10000
% P
AS
SIN
G
SIZE (MICROMETERS)
BOND BALL MILL GRINDABILITY : FEED & PRODUCT SIZEDISTRIBUTION
BOND BALL MILL CLOSED CIRCUIT GRINDABILITY : 106 MICROMETERS
SAMPLE IDENTITY COMPOSITE #10
CLIENT VISTA GOLD CORPORATION: MT TODD FEASIBILITY
PROJECT No A13575
DATE Jun-11
WT OF WT OF
PERIOD REVS WT OF WT OF WT WT NET WT NET WT CIRC'TING FRESH U/SIZE
OF 700 NEW OF OF OF OF LOAD FEED IN FEED
MILL mls FEED O/SIZE U/SIZE U/SIZE U/SIZE ADDED TO TO NEXT
PER REV NEXT CYCLE
(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)
1 200 1173.0 1173.0 974.6 198.4 117.2 0.586 491 198.4 13.7
2 548 1173.0 198.4 820.1 352.9 339.2 0.619 232 352.9 24.4
3 502 1173.0 353.0 818.8 354.2 329.8 0.657 231 354.2 24.5
4 473 1173.0 354.2 837.9 335.1 310.6 0.657 250 335.1 23.2
5 475 1173.0 335.1 837.9 335.1 311.9 0.657 250 335.1 23.2
Note : * = Ex grinding mill
PRODUCT IN THE FEED 6.92 (%)
BULK DENSITY 1.6757 (t/m3)
IDEAL POTENTIAL PRODUCT 335.1 (g)
AVERAGE EQUILIBRIUM CIRC LOAD 250 (%)
AVERAGE PRODUCT 0.657 (g/rev)
80 % PASSING FEED SIZE 2795 (µm)
80 % PASSING PRODUCT SIZE 77 (µm)
BOND BALL MILL WORK INDEX ( Kilowatt hours / dry tonne ) : 24.8
BOND BALL MILL GRINDABILITY TEST FEED AND PRODUCT SIZINGS
COMPOSITE #10A13575
FEED TO PERIOD No. 1 EQUILIBRIUM PRODUCTS
Size Weight Retained Passing Size Weight Retained Passing
(mm) (g) (%) (%) (mm) (g) (%) (%)
2.800 168.5 19.87 80.13 0.090 38.6 11.52 88.48
2.000 200.9 23.69 56.45 0.075 31.8 9.49 78.99
1.400 147.8 17.43 39.02 0.063 22.4 6.68 72.31
1.000 79.2 9.34 29.69 0.045 45.6 13.61 58.70
0.600 77.3 9.11 20.57 -0.045 196.7 58.70
0.300 64.5 7.60 12.97
0.150 38.7 4.56 8.41 TOTAL 335.1 100.00
0.106 12.6 1.49 6.92
-0.106 58.7 6.92 P 80 (µm) : 77
TOTAL 848.2 100.00
F 80 (µm) : 2795
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
10 100 1000 10000
% P
AS
SIN
G
SIZE (MICROMETERS)
BOND BALL MILL GRINDABILITY : FEED & PRODUCT SIZEDISTRIBUTION
BOND BALL MILL CLOSED CIRCUIT GRINDABILITY : 106 MICROMETERS
SAMPLE IDENTITY COMPOSITE #13
CLIENT VISTA GOLD CORPORATION: MT TODD FEASIBILITY
PROJECT No A13575
DATE Jun-11
WT OF WT OF
PERIOD REVS WT OF WT OF WT WT NET WT NET WT CIRC'TING FRESH U/SIZE
OF 700 NEW OF OF OF OF LOAD FEED IN FEED
MILL mls FEED O/SIZE U/SIZE U/SIZE U/SIZE ADDED TO TO NEXT
PER REV NEXT CYCLE
(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)
1 250 1215.9 1215.9 1011.9 204.0 143.5 0.574 496 204.0 10.2
2 588 1215.9 204.0 878.8 337.1 326.9 0.556 261 337.1 16.8
3 595 1215.9 337.1 850.7 365.2 348.4 0.586 233 365.2 18.2
4 562 1215.9 365.2 868.5 347.4 329.2 0.586 250 347.4 17.3
5 564 1215.9 347.4 868.5 347.4 330.1 0.585 250 347.4 17.3
Note : * = Ex grinding mill
PRODUCT IN THE FEED 4.98 (%)
BULK DENSITY 1.7370 (t/m3)
IDEAL POTENTIAL PRODUCT 347.4 (g)
AVERAGE EQUILIBRIUM CIRC LOAD 250 (%)
AVERAGE PRODUCT 0.586 (g/rev)
80 % PASSING FEED SIZE 2478 (µm)
80 % PASSING PRODUCT SIZE 77 (µm)
BOND BALL MILL WORK INDEX ( Kilowatt hours / dry tonne ) : 27.7
BOND BALL MILL GRINDABILITY TEST FEED AND PRODUCT SIZINGS
COMPOSITE #13A13575
FEED TO PERIOD No. 1 EQUILIBRIUM PRODUCTS
Size Weight Retained Passing Size Weight Retained Passing
(mm) (g) (%) (%) (mm) (g) (%) (%)
2.800 68.2 8.28 91.72 0.090 42.4 12.20 87.80
2.000 239.6 29.10 62.62 0.075 31.3 9.01 78.79
1.400 174.2 21.16 41.46 0.063 23.0 6.62 72.16
1.000 92.0 11.17 30.29 0.045 45.7 13.15 59.01
0.600 92.8 11.27 19.02 -0.045 205.0 59.01
0.300 68.6 8.33 10.69
0.150 34.9 4.24 6.45 TOTAL 347.4 100.00
0.106 12.1 1.47 4.98
-0.106 41.0 4.98 P 80 (µm) : 77
TOTAL 823.4 100.00
F 80 (µm) : 2478
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
10 100 1000 10000
% P
AS
SIN
G
SIZE (MICROMETERS)
BOND BALL MILL GRINDABILITY : FEED & PRODUCT SIZEDISTRIBUTION
BOND BALL MILL CLOSED CIRCUIT GRINDABILITY : 106 MICROMETERS
SAMPLE IDENTITY COMPOSITE #24
CLIENT VISTA GOLD CORPORATION: MT TODD FEASIBILITY
PROJECT No A13575
DATE Jun-11
WT OF WT OF
PERIOD REVS WT OF WT OF WT WT NET WT NET WT CIRC'TING FRESH U/SIZE
OF 700 NEW OF OF OF OF LOAD FEED IN FEED
MILL mls FEED O/SIZE U/SIZE U/SIZE U/SIZE ADDED TO TO NEXT
PER REV NEXT CYCLE
(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)
1 200 1251.9 1251.9 1055.2 196.7 114.4 0.572 536 196.7 12.9
2 602 1251.9 196.7 887.3 364.6 351.7 0.584 243 364.6 24.0
3 571 1251.9 364.6 865.6 386.3 362.3 0.635 224 386.3 25.4
4 524 1251.9 386.3 886.5 365.4 340.0 0.649 243 365.4 24.0
5 514 1251.9 365.4 887.4 364.5 340.5 0.662 243 364.5 23.9
6 504 1251.9 364.5 894.2 357.7 333.8 0.662 250 357.7 23.5
7 505 1251.9 357.7 894.2 357.7 334.2 0.662 250 357.7 23.5
Note : * = Ex grinding mill
PRODUCT IN THE FEED 6.57 (%)
BULK DENSITY 1.7884 (t/m3)
IDEAL POTENTIAL PRODUCT 357.7 (g)
AVERAGE EQUILIBRIUM CIRC LOAD 250 (%)
AVERAGE PRODUCT 0.662 (g/rev)
80 % PASSING FEED SIZE 2662 (µm)
80 % PASSING PRODUCT SIZE 74 (µm)
BOND BALL MILL WORK INDEX ( Kilowatt hours / dry tonne ) : 24.4
BOND BALL MILL GRINDABILITY TEST FEED AND PRODUCT SIZINGS
COMPOSITE #24A13575
FEED TO PERIOD No. 1 EQUILIBRIUM PRODUCTS
Size Weight Retained Passing Size Weight Retained Passing
(mm) (g) (%) (%) (mm) (g) (%) (%)
2.800 126.5 15.34 84.66 0.090 40.5 11.32 88.68
2.000 223.7 27.12 57.55 0.075 30.0 8.39 80.29
1.400 146.3 17.74 39.81 0.063 20.4 5.70 74.59
1.000 80.3 9.73 30.08 0.045 42.7 11.94 62.65
0.600 79.8 9.67 20.40 -0.045 224.1 62.65
0.300 66.9 8.11 12.29
0.150 36.5 4.42 7.87 TOTAL 357.7 100.00
0.106 10.7 1.30 6.57
-0.106 54.2 6.57 P 80 (µm) : 74
TOTAL 824.9 100.00
F 80 (µm) : 2662
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
10 100 1000 10000
% P
AS
SIN
G
SIZE (MICROMETERS)
BOND BALL MILL GRINDABILITY : FEED & PRODUCT SIZEDISTRIBUTION
BOND BALL MILL CLOSED CIRCUIT GRINDABILITY : 106 MICROMETERS
SAMPLE IDENTITY COMPOSITE #27
CLIENT VISTA GOLD CORPORATION: MT TODD FEASIBILITY
PROJECT No A13575
DATE Jun-11
WT OF WT OF
PERIOD REVS WT OF WT OF WT WT NET WT NET WT CIRC'TING FRESH U/SIZE
OF 700 NEW OF OF OF OF LOAD FEED IN FEED
MILL mls FEED O/SIZE U/SIZE U/SIZE U/SIZE ADDED TO TO NEXT
PER REV NEXT CYCLE
(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)
1 200 1270.8 1270.8 1056.5 214.3 107.5 0.538 493 214.3 18.0
2 642 1270.8 214.3 902.5 368.3 350.3 0.546 245 368.3 30.9
3 609 1270.8 368.3 885.5 385.3 354.4 0.582 230 385.3 32.4
4 568 1270.8 385.3 883.5 387.3 354.9 0.625 228 387.3 32.5
5 529 1270.8 387.3 917.0 353.8 321.3 0.607 259 353.8 29.7
6 549 1270.8 353.8 903.5 367.3 337.6 0.615 246 367.3 30.9
7 540 1270.8 367.3 907.7 363.1 332.2 0.615 250 363.1 30.5
8 541 1270.8 363.1 907.7 363.1 332.6 0.615 250 363.1 30.5
Note : * = Ex grinding mill
PRODUCT IN THE FEED 8.40 (%)
BULK DENSITY 1.8154 (t/m3)
IDEAL POTENTIAL PRODUCT 363.1 (g)
AVERAGE EQUILIBRIUM CIRC LOAD 250 (%)
AVERAGE PRODUCT 0.615 (g/rev)
80 % PASSING FEED SIZE 2552 (µm)
80 % PASSING PRODUCT SIZE 77 (µm)
BOND BALL MILL WORK INDEX ( Kilowatt hours / dry tonne ) : 26.6
BOND BALL MILL GRINDABILITY TEST FEED AND PRODUCT SIZINGS
COMPOSITE #27A13575
FEED TO PERIOD No. 1 EQUILIBRIUM PRODUCTS
Size Weight Retained Passing Size Weight Retained Passing
(mm) (g) (%) (%) (mm) (g) (%) (%)
2.800 120.0 14.46 85.54 0.090 45.4 12.50 87.50
2.000 147.9 17.83 67.71 0.075 32.1 8.84 78.66
1.400 146.6 17.67 50.04 0.063 22.3 6.14 72.51
1.000 96.6 11.64 38.40 0.045 42.7 11.76 60.75
0.600 100.4 12.10 26.30 -0.045 220.6 60.75
0.300 86.7 10.45 15.85
0.150 47.9 5.77 10.08 TOTAL 363.1 100.00
0.106 13.9 1.68 8.40
-0.106 69.7 8.40 P 80 (µm) : 77
TOTAL 829.7 100.00
F 80 (µm) : 2552
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
10 100 1000 10000
% P
AS
SIN
G
SIZE (MICROMETERS)
BOND BALL MILL GRINDABILITY : FEED & PRODUCT SIZEDISTRIBUTION
BOND BALL MILL CLOSED CIRCUIT GRINDABILITY : 106 MICROMETERS
SAMPLE IDENTITY COMPOSITE #28
CLIENT VISTA GOLD CORPORATION: MT TODD FEASIBILITY
PROJECT No A13575
DATE Jun-11
WT OF WT OF
PERIOD REVS WT OF WT OF WT WT NET WT NET WT CIRC'TING FRESH U/SIZE
OF 700 NEW OF OF OF OF LOAD FEED IN FEED
MILL mls FEED O/SIZE U/SIZE U/SIZE U/SIZE ADDED TO TO NEXT
PER REV NEXT CYCLE
(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)
1 250 1203.5 1203.5 1013.1 190.4 124.2 0.497 532 190.4 10.5
2 671 1203.5 190.4 825.3 378.2 367.7 0.548 218 378.2 20.8
3 589 1203.5 378.2 849.8 353.7 332.9 0.565 240 353.7 19.5
4 574 1203.5 353.7 859.6 343.9 324.4 0.565 250 343.9 18.9
5 575 1203.5 343.9 859.6 343.9 325.0 0.565 250 343.9 18.9
Note : * = Ex grinding mill
PRODUCT IN THE FEED 5.50 (%)
BULK DENSITY 1.7193 (t/m3)
IDEAL POTENTIAL PRODUCT 343.9 (g)
AVERAGE EQUILIBRIUM CIRC LOAD 250 (%)
AVERAGE PRODUCT 0.565 (g/rev)
80 % PASSING FEED SIZE 2497 (µm)
80 % PASSING PRODUCT SIZE 74 (µm)
BOND BALL MILL WORK INDEX ( Kilowatt hours / dry tonne ) : 27.7
BOND BALL MILL GRINDABILITY TEST FEED AND PRODUCT SIZINGS
COMPOSITE #28A13575
FEED TO PERIOD No. 1 EQUILIBRIUM PRODUCTS
Size Weight Retained Passing Size Weight Retained Passing
(mm) (g) (%) (%) (mm) (g) (%) (%)
2.800 81.1 9.25 90.75 0.090 35.5 10.32 89.68
2.000 248.9 28.40 62.35 0.075 30.7 8.93 80.75
1.400 189.0 21.56 40.79 0.063 21.5 6.25 74.50
1.000 98.5 11.24 29.55 0.045 46.0 13.38 61.12
0.600 95.3 10.87 18.68 -0.045 210.2 61.12
0.300 68.3 7.79 10.88
0.150 36.8 4.20 6.69 TOTAL 343.9 100.00
0.106 10.4 1.19 5.50
-0.106 48.2 5.50 P 80 (µm) : 74
TOTAL 876.5 100.00
F 80 (µm) : 2497
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
10 100 1000 10000
% P
AS
SIN
G
SIZE (MICROMETERS)
BOND BALL MILL GRINDABILITY : FEED & PRODUCT SIZEDISTRIBUTION
BOND BALL MILL CLOSED CIRCUIT GRINDABILITY : 106 MICROMETERS
SAMPLE IDENTITY COMPOSITE #42
CLIENT VISTA GOLD CORPORATION: MT TODD FEASIBILITY
PROJECT No A13575
DATE Jun-11
WT OF WT OF
PERIOD REVS WT OF WT OF WT WT NET WT NET WT CIRC'TING FRESH U/SIZE
OF 700 NEW OF OF OF OF LOAD FEED IN FEED
MILL mls FEED O/SIZE U/SIZE U/SIZE U/SIZE ADDED TO TO NEXT
PER REV NEXT CYCLE
(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)
1 200 1227.8 1227.8 139.9 1087.9 1021.1 5.105 13 1087.9 59.2
2 562 1227.8 188.1 890.2 337.6 278.4 0.495 264 337.6 18.4
3 571 1227.8 337.6 846.3 381.5 363.1 0.636 222 381.5 20.8
4 519 1227.8 381.5 863.2 364.6 343.8 0.662 237 364.6 19.8
5 500 1227.8 364.6 877.0 350.8 331.0 0.662 250 350.8 19.1
6 501 1227.8 350.8 877.0 350.8 331.7 0.662 250 350.8 19.1
Note : * = Ex grinding mill
PRODUCT IN THE FEED 5.44 (%)
BULK DENSITY 1.7540 (t/m3)
IDEAL POTENTIAL PRODUCT 350.8 (g)
AVERAGE EQUILIBRIUM CIRC LOAD 250 (%)
AVERAGE PRODUCT 0.662 (g/rev)
80 % PASSING FEED SIZE 2525 (µm)
80 % PASSING PRODUCT SIZE 75 (µm)
BOND BALL MILL WORK INDEX ( Kilowatt hours / dry tonne ) : 24.6
BOND BALL MILL GRINDABILITY TEST FEED AND PRODUCT SIZINGS
COMPOSITE #42A13575
FEED TO PERIOD No. 1 EQUILIBRIUM PRODUCTS
Size Weight Retained Passing Size Weight Retained Passing
(mm) (g) (%) (%) (mm) (g) (%) (%)
2.800 84.6 9.68 90.32 0.090 39.4 11.23 88.77
2.000 262.8 30.05 60.27 0.075 30.9 8.81 79.96
1.400 177.8 20.33 39.94 0.063 21.5 6.13 73.83
1.000 92.2 10.54 29.39 0.045 45.2 12.88 60.95
0.600 92.4 10.57 18.82 -0.045 213.8 60.95
0.300 68.7 7.86 10.97
0.150 35.4 4.05 6.92 TOTAL 350.8 100.00
0.106 12.9 1.48 5.44
-0.106 47.6 5.44 P 80 (µm) : 75
TOTAL 874.4 100.00
F 80 (µm) : 2525
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
10 100 1000 10000
% P
AS
SIN
G
SIZE (MICROMETERS)
BOND BALL MILL GRINDABILITY : FEED & PRODUCT SIZEDISTRIBUTION
BOND BALL MILL CLOSED CIRCUIT GRINDABILITY : 106 MICROMETERS
SAMPLE IDENTITY COMPOSITE #47
CLIENT VISTA GOLD CORPORATION: MT TODD FEASIBILITY
PROJECT No A13575
DATE Jun-11
WT OF WT OF
PERIOD REVS WT OF WT OF WT WT NET WT NET WT CIRC'TING FRESH U/SIZE
OF 700 NEW OF OF OF OF LOAD FEED IN FEED
MILL mls FEED O/SIZE U/SIZE U/SIZE U/SIZE ADDED TO TO NEXT
PER REV NEXT CYCLE
(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)
1 250 1226.1 1226.1 1029.1 197.0 136.1 0.544 522 197.0 9.8
2 625 1226.1 197.0 870.7 355.4 345.6 0.553 245 355.4 17.6
3 602 1226.1 355.4 866.3 359.8 342.2 0.568 241 359.8 17.9
4 585 1226.1 359.8 875.8 350.3 332.4 0.568 250 350.3 17.4
5 586 1226.1 350.3 875.8 350.3 332.9 0.568 250 350.3 17.4
Note : * = Ex grinding mill
PRODUCT IN THE FEED 4.97 (%)
BULK DENSITY 1.7516 (t/m3)
IDEAL POTENTIAL PRODUCT 350.3 (g)
AVERAGE EQUILIBRIUM CIRC LOAD 250 (%)
AVERAGE PRODUCT 0.568 (g/rev)
80 % PASSING FEED SIZE 2646 (µm)
80 % PASSING PRODUCT SIZE 68 (µm)
BOND BALL MILL WORK INDEX ( Kilowatt hours / dry tonne ) : 26.3
BOND BALL MILL GRINDABILITY TEST FEED AND PRODUCT SIZINGS
COMPOSITE #47A13575
FEED TO PERIOD No. 1 EQUILIBRIUM PRODUCTS
Size Weight Retained Passing Size Weight Retained Passing
(mm) (g) (%) (%) (mm) (g) (%) (%)
2.800 116.9 14.70 85.30 0.090 33.0 9.56 90.44
2.000 218.5 27.47 57.83 0.075 24.3 7.04 83.41
1.400 153.3 19.27 38.56 0.063 21.2 6.14 77.27
1.000 82.4 10.36 28.20 0.045 42.5 12.31 64.96
0.600 82.6 10.38 17.81 -0.045 224.3 64.96
0.300 61.0 7.67 10.15
0.150 32.8 4.12 6.02 TOTAL 345.3 100.00
0.106 8.4 1.06 4.97
-0.106 39.5 4.97 P 80 (µm) : 68
TOTAL 795.4 100.00
F 80 (µm) : 2646
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
10 100 1000 10000
% P
AS
SIN
G
SIZE (MICROMETERS)
BOND BALL MILL GRINDABILITY : FEED & PRODUCT SIZEDISTRIBUTION
BOND BALL MILL CLOSED CIRCUIT GRINDABILITY : 106 MICROMETERS
SAMPLE IDENTITY COMPOSITE #52
CLIENT VISTA GOLD CORPORATION: MT TODD FEASIBILITY
PROJECT No A13575
DATE Jun-11
WT OF WT OF
PERIOD REVS WT OF WT OF WT WT NET WT NET WT CIRC'TING FRESH U/SIZE
OF 700 NEW OF OF OF OF LOAD FEED IN FEED
MILL mls FEED O/SIZE U/SIZE U/SIZE U/SIZE ADDED TO TO NEXT
PER REV NEXT CYCLE
(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)
1 250 1163.0 1163.0 983.0 180.0 127.9 0.512 546 180.0 8.1
2 634 1163.0 180.0 817.1 345.9 337.8 0.533 236 345.9 15.5
3 595 1163.0 345.9 803.1 359.9 344.4 0.579 223 359.9 16.1
4 546 1163.0 359.9 823.3 339.7 323.6 0.593 242 339.7 15.2
5 535 1163.0 339.7 830.7 332.3 317.1 0.593 250 332.3 14.9
6 536 1163.0 332.3 830.7 332.3 317.4 0.592 250 332.3 14.9
Note : * = Ex grinding mill
PRODUCT IN THE FEED 4.48 (%)
BULK DENSITY 1.6614 (t/m3)
IDEAL POTENTIAL PRODUCT 332.3 (g)
AVERAGE EQUILIBRIUM CIRC LOAD 250 (%)
AVERAGE PRODUCT 0.592 (g/rev)
80 % PASSING FEED SIZE 2586 (µm)
80 % PASSING PRODUCT SIZE 80 (µm)
BOND BALL MILL WORK INDEX ( Kilowatt hours / dry tonne ) : 28.0
BOND BALL MILL GRINDABILITY TEST FEED AND PRODUCT SIZINGS
COMPOSITE #52A13575
FEED TO PERIOD No. 1 EQUILIBRIUM PRODUCTS
Size Weight Retained Passing Size Weight Retained Passing
(mm) (g) (%) (%) (mm) (g) (%) (%)
2.800 104.4 12.51 87.49 0.090 46.8 14.08 85.92
2.000 234.0 28.03 59.46 0.075 30.2 9.09 76.83
1.400 165.8 19.86 39.60 0.063 21.1 6.35 70.48
1.000 91.5 10.96 28.64 0.045 44.3 13.33 57.15
0.600 87.5 10.48 18.16 -0.045 189.9 57.15
0.300 69.6 8.34 9.82
0.150 35.0 4.19 5.63 TOTAL 332.3 100.00
0.106 9.6 1.15 4.48
-0.106 37.4 4.48 P 80 (µm) : 80
TOTAL 834.8 100.00
F 80 (µm) : 2586
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
10 100 1000 10000
% P
AS
SIN
G
SIZE (MICROMETERS)
BOND BALL MILL GRINDABILITY : FEED & PRODUCT SIZEDISTRIBUTION
BOND BALL MILL CLOSED CIRCUIT GRINDABILITY : 106 MICROMETERS
SAMPLE IDENTITY COMPOSITE #55
CLIENT VISTA GOLD CORPORATION: MT TODD FEASIBILITY
PROJECT No A13575
DATE Jun-11
WT OF WT OF
PERIOD REVS WT OF WT OF WT WT NET WT NET WT CIRC'TING FRESH U/SIZE
OF 700 NEW OF OF OF OF LOAD FEED IN FEED
MILL mls FEED O/SIZE U/SIZE U/SIZE U/SIZE ADDED TO TO NEXT
PER REV NEXT CYCLE
(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)
1 200 1176.5 1176.5 998.4 178.1 113.7 0.568 561 178.1 9.8
2 574 1176.5 178.1 829.4 347.1 337.3 0.588 239 347.1 19.0
3 540 1176.5 347.1 825.6 350.9 331.9 0.615 235 350.9 19.2
4 516 1176.5 350.9 844.6 331.9 312.7 0.606 254 331.9 18.2
5 525 1176.5 331.9 840.4 336.1 317.9 0.606 250 336.1 18.4
6 525 1176.5 336.1 840.4 336.1 317.7 0.605 250 336.1 18.4
Note : * = Ex grinding mill
PRODUCT IN THE FEED 5.48 (%)
BULK DENSITY 1.6807 (t/m3)
IDEAL POTENTIAL PRODUCT 336.1 (g)
AVERAGE EQUILIBRIUM CIRC LOAD 250 (%)
AVERAGE PRODUCT 0.605 (g/rev)
80 % PASSING FEED SIZE 2575 (µm)
80 % PASSING PRODUCT SIZE 71 (µm)
BOND BALL MILL WORK INDEX ( Kilowatt hours / dry tonne ) : 25.5
BOND BALL MILL GRINDABILITY TEST FEED AND PRODUCT SIZINGS
COMPOSITE #55A13575
FEED TO PERIOD No. 1 EQUILIBRIUM PRODUCTS
Size Weight Retained Passing Size Weight Retained Passing
(mm) (g) (%) (%) (mm) (g) (%) (%)
2.800 101.3 11.80 88.20 0.090 30.6 9.10 90.90
2.000 250.2 29.15 59.05 0.075 28.9 8.60 82.30
1.400 173.2 20.18 38.87 0.063 21.2 6.31 75.99
1.000 92.3 10.75 28.12 0.045 44.5 13.24 62.75
0.600 90.3 10.52 17.60 -0.045 210.9 62.75
0.300 63.5 7.40 10.21
0.150 30.4 3.54 6.66 TOTAL 336.1 100.00
0.106 10.2 1.19 5.48
-0.106 47.0 5.48 P 80 (µm) : 71
TOTAL 858.4 100.00
F 80 (µm) : 2575
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
10 100 1000 10000
% P
AS
SIN
G
SIZE (MICROMETERS)
BOND BALL MILL GRINDABILITY : FEED & PRODUCT SIZEDISTRIBUTION
BOND BALL MILL CLOSED CIRCUIT GRINDABILITY : 106 MICROMETERS
SAMPLE IDENTITY COMPOSITE #56
CLIENT VISTA GOLD CORPORATION: MT TODD FEASIBILITY
PROJECT No A13575
DATE Jun-11
WT OF WT OF
PERIOD REVS WT OF WT OF WT WT NET WT NET WT CIRC'TING FRESH U/SIZE
OF 700 NEW OF OF OF OF LOAD FEED IN FEED
MILL mls FEED O/SIZE U/SIZE U/SIZE U/SIZE ADDED TO TO NEXT
PER REV NEXT CYCLE
(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)
1 250 1232.1 1232.1 1057.5 174.6 119.4 0.478 606 174.6 7.8
2 721 1232.1 174.6 864.2 367.9 360.1 0.499 235 367.9 16.5
3 672 1232.1 367.9 848.8 383.3 366.8 0.546 221 383.3 17.2
4 613 1232.1 383.3 856.0 376.1 358.9 0.586 228 376.1 16.8
5 572 1232.1 376.1 874.8 357.3 340.5 0.595 245 357.3 16.0
6 565 1232.1 357.3 880.1 352.0 336.0 0.595 250 352.0 15.8
7 565 1232.1 352.0 880.1 352.0 336.2 0.595 250 352.0 15.8
Note : * = Ex grinding mill
PRODUCT IN THE FEED 4.48 (%)
BULK DENSITY 1.7601 (t/m3)
IDEAL POTENTIAL PRODUCT 352.0 (g)
AVERAGE EQUILIBRIUM CIRC LOAD 250 (%)
AVERAGE PRODUCT 0.595 (g/rev)
80 % PASSING FEED SIZE 2521 (µm)
80 % PASSING PRODUCT SIZE 78 (µm)
BOND BALL MILL WORK INDEX ( Kilowatt hours / dry tonne ) : 27.4
BOND BALL MILL GRINDABILITY TEST FEED AND PRODUCT SIZINGS
COMPOSITE #56A13575
FEED TO PERIOD No. 1 EQUILIBRIUM PRODUCTS
Size Weight Retained Passing Size Weight Retained Passing
(mm) (g) (%) (%) (mm) (g) (%) (%)
2.800 85.8 10.50 89.50 0.090 42.3 12.02 87.98
2.000 223.1 27.29 62.21 0.075 34.0 9.66 78.33
1.400 160.2 19.60 42.61 0.063 23.0 6.53 71.79
1.000 92.5 11.32 31.29 0.045 47.4 13.46 58.33
0.600 93.0 11.38 19.92 -0.045 205.3 58.33
0.300 75.6 9.25 10.67
0.150 39.7 4.86 5.81 TOTAL 352.0 100.00
0.106 10.9 1.33 4.48
-0.106 36.6 4.48 P 80 (µm) : 78
TOTAL 817.4 100.00
F 80 (µm) : 2521
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
10 100 1000 10000
% P
AS
SIN
G
SIZE (MICROMETERS)
BOND BALL MILL GRINDABILITY : FEED & PRODUCT SIZEDISTRIBUTION
BOND BALL MILL CLOSED CIRCUIT GRINDABILITY : 106 MICROMETERS
SAMPLE IDENTITY COMPOSITE #57
CLIENT VISTA GOLD CORPORATION: MT TODD FEASIBILITY
PROJECT No A13575
DATE Jun-11
WT OF WT OF
PERIOD REVS WT OF WT OF WT WT NET WT NET WT CIRC'TING FRESH U/SIZE
OF 700 NEW OF OF OF OF LOAD FEED IN FEED
MILL mls FEED O/SIZE U/SIZE U/SIZE U/SIZE ADDED TO TO NEXT
PER REV NEXT CYCLE
(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)
1 200 1297.0 1297.0 1113.6 183.4 108.2 0.541 607 183.4 10.6
2 665 1297.0 183.4 931.5 365.5 354.9 0.534 255 365.5 21.2
3 655 1297.0 365.5 897.4 399.6 378.4 0.578 225 399.6 23.2
4 601 1297.0 399.6 934.7 362.3 339.1 0.564 258 362.3 21.0
5 619 1297.0 362.3 926.4 370.6 349.6 0.565 250 370.6 21.5
6 618 1297.0 370.6 926.4 370.6 349.1 0.565 250 370.6 21.5
Note : * = Ex grinding mill
PRODUCT IN THE FEED 5.80 (%)
BULK DENSITY 1.8529 (t/m3)
IDEAL POTENTIAL PRODUCT 370.6 (g)
AVERAGE EQUILIBRIUM CIRC LOAD 250 (%)
AVERAGE PRODUCT 0.565 (g/rev)
80 % PASSING FEED SIZE 2471 (µm)
80 % PASSING PRODUCT SIZE 75 (µm)
BOND BALL MILL WORK INDEX ( Kilowatt hours / dry tonne ) : 28.1
BOND BALL MILL GRINDABILITY TEST FEED AND PRODUCT SIZINGS
COMPOSITE #57A13575
FEED TO PERIOD No. 1 EQUILIBRIUM PRODUCTS
Size Weight Retained Passing Size Weight Retained Passing
(mm) (g) (%) (%) (mm) (g) (%) (%)
2.800 75.6 9.35 90.65 0.090 40.8 11.01 88.99
2.000 209.3 25.88 64.77 0.075 33.6 9.07 79.92
1.400 153.9 19.03 45.75 0.063 24.7 6.67 73.26
1.000 90.8 11.23 34.52 0.045 49.3 13.30 59.95
0.600 99.8 12.34 22.18 -0.045 222.2 59.95
0.300 77.1 9.53 12.65
0.150 40.6 5.02 7.63 TOTAL 370.6 100.00
0.106 14.8 1.83 5.80
-0.106 46.9 5.80 P 80 (µm) : 75
TOTAL 808.8 100.00
F 80 (µm) : 2471
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
10 100 1000 10000
% P
AS
SIN
G
SIZE (MICROMETERS)
BOND BALL MILL GRINDABILITY : FEED & PRODUCT SIZEDISTRIBUTION
BOND BALL MILL CLOSED CIRCUIT GRINDABILITY : 106 MICROMETERS
SAMPLE IDENTITY COMPOSITE #58
CLIENT VISTA GOLD CORPORATION: MT TODD FEASIBILITY
PROJECT No A13575
DATE Jun-11
WT OF WT OF
PERIOD REVS WT OF WT OF WT WT NET WT NET WT CIRC'TING FRESH U/SIZE
OF 700 NEW OF OF OF OF LOAD FEED IN FEED
MILL mls FEED O/SIZE U/SIZE U/SIZE U/SIZE ADDED TO TO NEXT
PER REV NEXT CYCLE
(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)
1 250 1218.6 1218.6 1022.1 196.5 139.2 0.557 520 196.5 9.2
2 609 1218.6 196.5 887.1 331.5 322.3 0.529 268 331.5 15.6
3 629 1218.6 331.5 856.6 362.0 346.4 0.551 237 362.0 17.0
4 601 1218.6 362.0 841.2 377.4 360.4 0.600 223 377.4 17.8
5 551 1218.6 377.4 879.5 339.1 321.3 0.583 259 339.1 16.0
6 570 1218.6 339.1 870.4 348.2 332.2 0.583 250 348.2 16.4
7 569 1218.6 348.2 870.4 348.2 331.8 0.583 250 348.2 16.4
Note : * = Ex grinding mill
PRODUCT IN THE FEED 4.70 (%)
BULK DENSITY 1.7409 (t/m3)
IDEAL POTENTIAL PRODUCT 348.2 (g)
AVERAGE EQUILIBRIUM CIRC LOAD 250 (%)
AVERAGE PRODUCT 0.583 (g/rev)
80 % PASSING FEED SIZE 2790 (µm)
80 % PASSING PRODUCT SIZE 77 (µm)
BOND BALL MILL WORK INDEX ( Kilowatt hours / dry tonne ) : 27.6
BOND BALL MILL GRINDABILITY TEST FEED AND PRODUCT SIZINGS
COMPOSITE #58A13575
FEED TO PERIOD No. 1 EQUILIBRIUM PRODUCTS
Size Weight Retained Passing Size Weight Retained Passing
(mm) (g) (%) (%) (mm) (g) (%) (%)
2.800 164.8 19.68 80.32 0.090 42.6 12.24 87.76
2.000 207.9 24.82 55.50 0.075 32.1 9.22 78.54
1.400 152.8 18.24 37.26 0.063 23.1 6.63 71.91
1.000 84.9 10.14 27.13 0.045 44.5 12.78 59.13
0.600 84.7 10.11 17.01 -0.045 205.9 59.13
0.300 60.8 7.26 9.75
0.150 30.7 3.67 6.09 TOTAL 348.2 100.00
0.106 11.6 1.38 4.70
-0.106 39.4 4.70 P 80 (µm) : 77
TOTAL 837.6 100.00
F 80 (µm) : 2790
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
10 100 1000 10000
% P
AS
SIN
G
SIZE (MICROMETERS)
BOND BALL MILL GRINDABILITY : FEED & PRODUCT SIZEDISTRIBUTION
BOND BALL MILL CLOSED CIRCUIT GRINDABILITY : 106 MICROMETERS
SAMPLE IDENTITY COMPOSITE #60
CLIENT VISTA GOLD CORPORATION: MT TODD FEASIBILITY
PROJECT No A13575
DATE Jun-11
WT OF WT OF
PERIOD REVS WT OF WT OF WT WT NET WT NET WT CIRC'TING FRESH U/SIZE
OF 700 NEW OF OF OF OF LOAD FEED IN FEED
MILL mls FEED O/SIZE U/SIZE U/SIZE U/SIZE ADDED TO TO NEXT
PER REV NEXT CYCLE
(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)
1 200 1180.5 1180.5 1012.9 167.6 103.2 0.516 604 167.6 9.1
2 636 1180.5 167.6 836.5 344.0 334.9 0.526 243 344.0 18.8
3 605 1180.5 344.0 818.5 362.0 343.2 0.567 226 362.0 19.8
4 560 1180.5 362.0 833.9 346.6 326.8 0.584 241 346.6 18.9
5 545 1180.5 346.6 843.2 337.3 318.4 0.584 250 337.3 18.4
6 546 1180.5 337.3 843.2 337.3 318.9 0.584 250 337.3 18.4
Note : * = Ex grinding mill
PRODUCT IN THE FEED 5.46 (%)
BULK DENSITY 1.6864 (t/m3)
IDEAL POTENTIAL PRODUCT 337.3 (g)
AVERAGE EQUILIBRIUM CIRC LOAD 250 (%)
AVERAGE PRODUCT 0.584 (g/rev)
80 % PASSING FEED SIZE 2749 (µm)
80 % PASSING PRODUCT SIZE 79 (µm)
BOND BALL MILL WORK INDEX ( Kilowatt hours / dry tonne ) : 27.8
BOND BALL MILL GRINDABILITY TEST FEED AND PRODUCT SIZINGS
COMPOSITE #60A13575
FEED TO PERIOD No. 1 EQUILIBRIUM PRODUCTS
Size Weight Retained Passing Size Weight Retained Passing
(mm) (g) (%) (%) (mm) (g) (%) (%)
2.800 153.1 18.45 81.55 0.090 40.7 12.07 87.93
2.000 202.4 24.39 57.17 0.075 35.0 10.38 77.56
1.400 150.2 18.10 39.07 0.063 23.7 7.03 70.53
1.000 83.8 10.10 28.98 0.045 48.2 14.29 56.24
0.600 84.4 10.17 18.81 -0.045 189.7 56.24
0.300 62.7 7.55 11.25
0.150 34.3 4.13 7.12 TOTAL 337.3 100.00
0.106 13.8 1.66 5.46
-0.106 45.3 5.46 P 80 (µm) : 79
TOTAL 830.0 100.00
F 80 (µm) : 2749
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
10 100 1000 10000
% P
AS
SIN
G
SIZE (MICROMETERS)
BOND BALL MILL GRINDABILITY : FEED & PRODUCT SIZEDISTRIBUTION
BOND BALL MILL CLOSED CIRCUIT GRINDABILITY : 106 MICROMETERS
SAMPLE IDENTITY COMPOSITE #61
CLIENT VISTA GOLD CORPORATION: MT TODD FEASIBILITY
PROJECT No A13575
DATE Jun-11
WT OF WT OF
PERIOD REVS WT OF WT OF WT WT NET WT NET WT CIRC'TING FRESH U/SIZE
OF 700 NEW OF OF OF OF LOAD FEED IN FEED
MILL mls FEED O/SIZE U/SIZE U/SIZE U/SIZE ADDED TO TO NEXT
PER REV NEXT CYCLE
(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)
1 250 1247.1 1247.1 1043.3 203.8 144.7 0.579 512 203.8 9.7
2 599 1247.1 203.8 913.0 334.1 324.4 0.542 273 334.1 15.8
3 629 1247.1 334.1 881.2 365.9 350.1 0.557 241 365.9 17.3
4 609 1247.1 365.9 890.8 356.3 339.0 0.557 250 356.3 16.9
5 610 1247.1 356.3 890.8 356.3 339.4 0.556 250 356.3 16.9
Note : * = Ex grinding mill
PRODUCT IN THE FEED 4.74 (%)
BULK DENSITY 1.7816 (t/m3)
IDEAL POTENTIAL PRODUCT 356.3 (g)
AVERAGE EQUILIBRIUM CIRC LOAD 250 (%)
AVERAGE PRODUCT 0.557 (g/rev)
80 % PASSING FEED SIZE 2792 (µm)
80 % PASSING PRODUCT SIZE 76 (µm)
BOND BALL MILL WORK INDEX ( Kilowatt hours / dry tonne ) : 28.2
BOND BALL MILL GRINDABILITY TEST FEED AND PRODUCT SIZINGS
COMPOSITE #61A13575
FEED TO PERIOD No. 1 EQUILIBRIUM PRODUCTS
Size Weight Retained Passing Size Weight Retained Passing
(mm) (g) (%) (%) (mm) (g) (%) (%)
2.800 169.7 19.75 80.25 0.090 38.6 10.83 89.17
2.000 214.9 25.01 55.25 0.075 33.9 9.51 79.65
1.400 152.1 17.70 37.55 0.063 23.5 6.60 73.06
1.000 86.9 10.11 27.44 0.045 49.1 13.78 59.28
0.600 87.0 10.12 17.31 -0.045 211.2 59.28
0.300 63.4 7.38 9.94
0.150 32.7 3.80 6.13 TOTAL 356.3 100.00
0.106 12.0 1.40 4.74
-0.106 40.7 4.74 P 80 (µm) : 76
TOTAL 859.4 100.00
F 80 (µm) : 2792
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
10 100 1000 10000
% P
AS
SIN
G
SIZE (MICROMETERS)
BOND BALL MILL GRINDABILITY : FEED & PRODUCT SIZEDISTRIBUTION
BOND BALL MILL CLOSED CIRCUIT GRINDABILITY : 106 MICROMETERS
SAMPLE IDENTITY COMPOSITE #62
CLIENT VISTA GOLD CORPORATION: MT TODD FEASIBILITY
PROJECT No A13575
DATE Jun-11
WT OF WT OF
PERIOD REVS WT OF WT OF WT WT NET WT NET WT CIRC'TING FRESH U/SIZE
OF 700 NEW OF OF OF OF LOAD FEED IN FEED
MILL mls FEED O/SIZE U/SIZE U/SIZE U/SIZE ADDED TO TO NEXT
PER REV NEXT CYCLE
(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)
1 200 1264.3 1264.3 1056.3 208.0 120.9 0.604 508 208.0 14.3
2 574 1264.3 208.0 907.7 356.6 342.3 0.596 255 356.6 24.6
3 565 1264.3 356.6 865.8 398.5 373.9 0.662 217 398.5 27.5
4 504 1264.3 398.5 903.1 361.2 333.7 0.662 250 361.2 24.9
5 508 1264.3 361.2 903.1 361.2 336.3 0.662 250 361.2 24.9
Note : * = Ex grinding mill
PRODUCT IN THE FEED 6.89 (%)
BULK DENSITY 1.8061 (t/m3)
IDEAL POTENTIAL PRODUCT 361.2 (g)
AVERAGE EQUILIBRIUM CIRC LOAD 250 (%)
AVERAGE PRODUCT 0.662 (g/rev)
80 % PASSING FEED SIZE 2534 (µm)
80 % PASSING PRODUCT SIZE 77 (µm)
BOND BALL MILL WORK INDEX ( Kilowatt hours / dry tonne ) : 25.1
BOND BALL MILL GRINDABILITY TEST FEED AND PRODUCT SIZINGS
COMPOSITE #62A13575
FEED TO PERIOD No. 1 EQUILIBRIUM PRODUCTS
Size Weight Retained Passing Size Weight Retained Passing
(mm) (g) (%) (%) (mm) (g) (%) (%)
2.800 85.9 10.44 89.56 0.090 44.7 12.37 87.63
2.000 236.3 28.72 60.84 0.075 32.9 9.11 78.52
1.400 164.9 20.04 40.80 0.063 22.8 6.31 72.21
1.000 83.5 10.15 30.65 0.045 47.4 13.12 59.08
0.600 83.7 10.17 20.48 -0.045 213.4 59.08
0.300 63.5 7.72 12.76
0.150 34.9 4.24 8.52 TOTAL 361.2 100.00
0.106 13.4 1.63 6.89
-0.106 56.7 6.89 P 80 (µm) : 77
TOTAL 822.8 100.00
F 80 (µm) : 2534
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
10 100 1000 10000
% P
AS
SIN
G
SIZE (MICROMETERS)
BOND BALL MILL GRINDABILITY : FEED & PRODUCT SIZEDISTRIBUTION
BOND BALL MILL CLOSED CIRCUIT GRINDABILITY : 106 MICROMETERS
SAMPLE IDENTITY COMPOSITE #63
CLIENT VISTA GOLD CORPORATION: MT TODD FEASIBILITY
PROJECT No A13575
DATE Jun-11
WT OF WT OF
PERIOD REVS WT OF WT OF WT WT NET WT NET WT CIRC'TING FRESH U/SIZE
OF 700 NEW OF OF OF OF LOAD FEED IN FEED
MILL mls FEED O/SIZE U/SIZE U/SIZE U/SIZE ADDED TO TO NEXT
PER REV NEXT CYCLE
(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)
1 200 1242.1 1242.1 1066.2 175.9 108.7 0.543 606 175.9 9.5
2 636 1242.1 175.9 880.5 361.6 352.1 0.554 244 361.6 19.6
3 606 1242.1 361.6 874.9 367.2 347.6 0.574 238 367.2 19.9
4 584 1242.1 367.2 872.2 369.9 350.0 0.599 236 369.9 20.0
5 559 1242.1 369.9 877.6 364.5 344.5 0.616 241 364.5 19.7
6 544 1242.1 364.5 887.2 354.9 335.2 0.616 250 354.9 19.2
7 545 1242.1 354.9 887.2 354.9 335.7 0.616 250 354.9 19.2
Note : * = Ex grinding mill
PRODUCT IN THE FEED 5.41 (%)
BULK DENSITY 1.7744 (t/m3)
IDEAL POTENTIAL PRODUCT 354.9 (g)
AVERAGE EQUILIBRIUM CIRC LOAD 250 (%)
AVERAGE PRODUCT 0.616 (g/rev)
80 % PASSING FEED SIZE 2668 (µm)
80 % PASSING PRODUCT SIZE 78 (µm)
BOND BALL MILL WORK INDEX ( Kilowatt hours / dry tonne ) : 26.7
BOND BALL MILL GRINDABILITY TEST FEED AND PRODUCT SIZINGS
COMPOSITE #63A13575
FEED TO PERIOD No. 1 EQUILIBRIUM PRODUCTS
Size Weight Retained Passing Size Weight Retained Passing
(mm) (g) (%) (%) (mm) (g) (%) (%)
2.800 126.3 15.97 84.03 0.090 44.6 12.57 87.43
2.000 193.0 24.40 59.63 0.075 34.3 9.66 77.77
1.400 159.7 20.19 39.44 0.063 24.0 6.76 71.01
1.000 82.2 10.39 29.05 0.045 47.0 13.24 57.76
0.600 82.5 10.43 18.62 -0.045 205.0 57.76
0.300 60.7 7.67 10.95
0.150 31.8 4.02 6.93 TOTAL 354.9 100.00
0.106 12.0 1.52 5.41
-0.106 42.8 5.41 P 80 (µm) : 78
TOTAL 791.0 100.00
F 80 (µm) : 2668
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
10 100 1000 10000
% P
AS
SIN
G
SIZE (MICROMETERS)
BOND BALL MILL GRINDABILITY : FEED & PRODUCT SIZEDISTRIBUTION
BOND BALL MILL CLOSED CIRCUIT GRINDABILITY : 106 MICROMETERS
SAMPLE IDENTITY COMPOSITE #65
CLIENT VISTA GOLD CORPORATION: MT TODD FEASIBILITY
PROJECT No A13575
DATE Jun-11
WT OF WT OF
PERIOD REVS WT OF WT OF WT WT NET WT NET WT CIRC'TING FRESH U/SIZE
OF 700 NEW OF OF OF OF LOAD FEED IN FEED
MILL mls FEED O/SIZE U/SIZE U/SIZE U/SIZE ADDED TO TO NEXT
PER REV NEXT CYCLE
(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)
1 200 1276.9 1276.9 1025.8 251.1 166.8 0.834 409 251.1 16.6
2 417 1276.9 251.1 1009.1 267.8 251.2 0.602 377 267.8 17.7
3 576 1276.9 267.8 887.7 389.2 371.5 0.645 228 389.2 25.7
4 526 1276.9 389.2 888.9 388.0 362.3 0.689 229 388.0 25.6
5 492 1276.9 388.0 912.1 364.8 339.2 0.689 250 364.8 24.1
6 494 1276.9 364.8 912.1 364.8 340.7 0.690 250 364.8 24.1
Note : * = Ex grinding mill
PRODUCT IN THE FEED 6.60 (%)
BULK DENSITY 1.8241 (t/m3)
IDEAL POTENTIAL PRODUCT 364.8 (g)
AVERAGE EQUILIBRIUM CIRC LOAD 250 (%)
AVERAGE PRODUCT 0.690 (g/rev)
80 % PASSING FEED SIZE 2619 (µm)
80 % PASSING PRODUCT SIZE 80 (µm)
BOND BALL MILL WORK INDEX ( Kilowatt hours / dry tonne ) : 24.6
BOND BALL MILL GRINDABILITY TEST FEED AND PRODUCT SIZINGS
COMPOSITE #65A13575
FEED TO PERIOD No. 1 EQUILIBRIUM PRODUCTS
Size Weight Retained Passing Size Weight Retained Passing
(mm) (g) (%) (%) (mm) (g) (%) (%)
2.800 97.4 14.57 85.43 0.090 49.0 13.43 86.57
2.000 160.6 24.03 61.39 0.075 35.5 9.73 76.84
1.400 138.7 20.75 40.64 0.063 24.5 6.72 70.12
1.000 70.0 10.47 30.17 0.045 47.3 12.96 57.16
0.600 67.4 10.09 20.08 -0.045 208.5 57.16
0.300 51.3 7.68 12.40
0.150 28.8 4.31 8.10 TOTAL 364.8 100.00
0.106 10.0 1.50 6.60
-0.106 44.1 6.60 P 80 (µm) : 80
TOTAL 668.3 100.00
F 80 (µm) : 2619
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
10 100 1000 10000
% P
AS
SIN
G
SIZE (MICROMETERS)
BOND BALL MILL GRINDABILITY : FEED & PRODUCT SIZEDISTRIBUTION
BOND BALL MILL CLOSED CIRCUIT GRINDABILITY : 106 MICROMETERS
SAMPLE IDENTITY COMPOSITE #69
CLIENT VISTA GOLD CORPORATION: MT TODD FEASIBILITY
PROJECT No A13575
DATE Jun-11
WT OF WT OF
PERIOD REVS WT OF WT OF WT WT NET WT NET WT CIRC'TING FRESH U/SIZE
OF 700 NEW OF OF OF OF LOAD FEED IN FEED
MILL mls FEED O/SIZE U/SIZE U/SIZE U/SIZE ADDED TO TO NEXT
PER REV NEXT CYCLE
(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)
1 200 1267.6 1267.6 1047.4 220.2 141.7 0.709 476 220.2 13.6
2 492 1267.6 220.2 943.1 324.5 310.9 0.632 291 324.5 20.1
3 541 1267.6 324.5 867.5 400.1 380.0 0.702 217 400.1 24.8
4 480 1267.6 400.1 905.4 362.2 337.4 0.703 250 362.2 22.4
5 483 1267.6 362.2 905.4 362.2 339.8 0.703 250 362.2 22.4
Note : * = Ex grinding mill
PRODUCT IN THE FEED 6.19 (%)
BULK DENSITY 1.8109 (t/m3)
IDEAL POTENTIAL PRODUCT 362.2 (g)
AVERAGE EQUILIBRIUM CIRC LOAD 250 (%)
AVERAGE PRODUCT 0.703 (g/rev)
80 % PASSING FEED SIZE 2685 (µm)
80 % PASSING PRODUCT SIZE 76 (µm)
BOND BALL MILL WORK INDEX ( Kilowatt hours / dry tonne ) : 23.6
BOND BALL MILL GRINDABILITY TEST FEED AND PRODUCT SIZINGS
COMPOSITE #69A13575
FEED TO PERIOD No. 1 EQUILIBRIUM PRODUCTS
Size Weight Retained Passing Size Weight Retained Passing
(mm) (g) (%) (%) (mm) (g) (%) (%)
2.800 109.5 16.29 83.71 0.090 41.5 11.46 88.54
2.000 172.5 25.67 58.04 0.075 34.2 9.44 79.10
1.400 126.4 18.81 39.23 0.063 22.4 6.18 72.91
1.000 68.1 10.13 29.09 0.045 47.0 12.98 59.94
0.600 66.3 9.87 19.23 -0.045 217.1 59.94
0.300 50.2 7.47 11.76
0.150 28.1 4.18 7.57 TOTAL 362.2 100.00
0.106 9.3 1.38 6.19
-0.106 41.6 6.19 P 80 (µm) : 76
TOTAL 672.0 100.00
F 80 (µm) : 2685
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
10 100 1000 10000
% P
AS
SIN
G
SIZE (MICROMETERS)
BOND BALL MILL GRINDABILITY : FEED & PRODUCT SIZEDISTRIBUTION
BOND BALL MILL CLOSED CIRCUIT GRINDABILITY : 106 MICROMETERS
SAMPLE IDENTITY COMPOSITE #74
CLIENT VISTA GOLD CORPORATION: MT TODD FEASIBILITY
PROJECT No A13575
DATE Jun-11
WT OF WT OF
PERIOD REVS WT OF WT OF WT WT NET WT NET WT CIRC'TING FRESH U/SIZE
OF 700 NEW OF OF OF OF LOAD FEED IN FEED
MILL mls FEED O/SIZE U/SIZE U/SIZE U/SIZE ADDED TO TO NEXT
PER REV NEXT CYCLE
(g) (g) (g)* (g)* (g)* (g) (%) CYCLE (g) (g)
1 200 1229.5 1229.5 1035.5 194.0 132.4 0.662 534 194.0 9.7
2 516 1229.5 194.0 905.0 324.5 314.8 0.610 279 324.5 16.3
3 549 1229.5 324.5 847.4 382.1 365.8 0.666 222 382.1 19.1
4 498 1229.5 382.1 869.9 359.6 340.5 0.684 242 359.6 18.0
5 487 1229.5 359.6 878.2 351.3 333.3 0.684 250 351.3 17.6
6 488 1229.5 351.3 878.2 351.3 333.7 0.684 250 351.3 17.6
Note : * = Ex grinding mill
PRODUCT IN THE FEED 5.01 (%)
BULK DENSITY 1.7564 (t/m3)
IDEAL POTENTIAL PRODUCT 351.3 (g)
AVERAGE EQUILIBRIUM CIRC LOAD 250 (%)
AVERAGE PRODUCT 0.684 (g/rev)
80 % PASSING FEED SIZE 2652 (µm)
80 % PASSING PRODUCT SIZE 81 (µm)
BOND BALL MILL WORK INDEX ( Kilowatt hours / dry tonne ) : 24.9
BOND BALL MILL GRINDABILITY TEST FEED AND PRODUCT SIZINGS
COMPOSITE #74A13575
FEED TO PERIOD No. 1 EQUILIBRIUM PRODUCTS
Size Weight Retained Passing Size Weight Retained Passing
(mm) (g) (%) (%) (mm) (g) (%) (%)
2.800 100.5 14.85 85.15 0.090 46.9 13.70 86.30
2.000 189.1 27.94 57.22 0.075 34.4 10.05 76.25
1.400 134.4 19.86 37.36 0.063 24.7 7.22 69.03
1.000 70.2 10.37 26.99 0.045 46.3 13.53 55.51
0.600 65.7 9.71 17.28 -0.045 190.0 55.51
0.300 48.3 7.14 10.15
0.150 26.4 3.90 6.25 TOTAL 342.3 100.00
0.106 8.4 1.24 5.01
-0.106 33.9 5.01 P 80 (µm) : 81
TOTAL 676.9 100.00
F 80 (µm) : 2652
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
10 100 1000 10000
% P
AS
SIN
G
SIZE (MICROMETERS)
BOND BALL MILL GRINDABILITY : FEED & PRODUCT SIZEDISTRIBUTION
Report No. A13575 Part 1
APPENDIX XII
Mt Todd Variability Gold Ore Drill Core
• Mineralogy (MLA) Report MIN815 • LIMS Testwork
Details and Results
Qu
TheALS Am
uantitativ
Six (6
e results containmmtec accepts n
ve Automco
6) DiamonMt T
Vista Go(Proj
Minera
J
ned in this reporno responsibility
ated Minonducted on
nd Core STodd Proj
for
old Corpoject A135
alogy RepMIN815
uly 201
rt relate only to ty for the represe
eralogica
Samples frect
oration 75)
port No. 5
11
the sample(s) suntativeness of th
al Analysis
rom
bmitted for testhe sample(s) sub
is
ting. bmitted.
SUMMA 1.
2.
3.
4.
5.
APPE Append Append
ARY
INTRODUC
SAMPLES R
SAMPLE PR
ANALYTICA
RESULTS
5.1 Qua
5.2 Calc
5.3 Tex
5.3.1
5.3.2
5.3.3
5.3.4
5.3.5
5.3.6
ENDICES
dix I Q
dix II P
T
CTION
RECEIVED
REPARATIO
AL PROCED
antitative M
culated Par
xtural Indica
1 Comp
2 Comp
3 Comp
4 Comp
5 Comp.
6 Comp.
S
Quantitative
Particle Imag
TABLE O
ON
DURES
Mineralogy
rticle and G
ations (Par
#16 VB11-0
#19 VB11-0
#26 VB11-0
#33 VB12-0
. #39 VB12–
. #91 VB12–
Mineralogy
ges
OF CON
y and Gold-
Grain Size
rticle Image
001 349-36
001 380-39
001 456-46
002 284-29
–002 45–35
–010 18.80–
y and SEM Im
NTENT
Silver Mine
es)
60 m
9 1m
65 m
94 m
5 m
–29.92 m
mages of D
Mineralogy R
TS
eralisation
etected Gol
Report No. MIN
ld-Silver Min
N815 (A13575)
PAGE NO.
(i)
1
1
2
2
2
2
5
7
7
7
7
8
8
8
neral Grains
)
.
s
The minCorpora A summ
neralogical ation was re
mary of sign
The modal as indicativproduce stathe samplesexpected amica/clays tthis. Asideincluding pthe dominalarge pyrrhothe chalcopComp #26 galena in th
From the manalysis it argentian gcould contahigh bismupresent wit
The generathe bounda
examinatioequested by
ificant findin
mineralogive values, atistically ros does shows the quartzthan quartze from the
pyrite, pyrrhant sulphideotite grain dpyrite showsshowing ne
he samples w
manual SEMwas found
gold. It was aain a very tth peak heih the bismu
l gold mineary between
SU
on of six (6) y the ALS Am
ngs follows:
cal data obas measure
obust minerws dominanz vein was , and later e
e silicates, sotite, chalcoe is pyrite, detected in s a significaearly 1% chwere only d
M EDS analy that the malso found ttrace amounight exact quth.
eralisation fo the vein an
Page i of i
UMMAR
core sampmmtec gold
:
btained for tement of aral populatice of quartztargeted. In
examinationseveral sulpopyrite, sphwith the nothe measur
ant occurrenhalcopyrite cdetected at t
ysis of the dmajority of that the bismnt of platin
quantificatio
or all samplend the host
RY
ples from thd processing
the 6 polisha single 2Dions. Howez and mica/nterestingly,n of the minphides werhalerite andotable exceement area
nce in the Vconcentratiotrace amoun
detected gothe gold o
muth detectum. Howe
on could not
es occurredrock.
Mineralogy R
he Mt Todd g team.
hed sectionsD cross-secever, the ind/clays in all s Comp #33eral map wie also dete galena. In
eption of Co. Of the rem
VB11 sampleon. The remnts.
old grains doccurred asted with thever, due to t be carried
within the
Report No. MIN
Project for
s should bectional surfdicative misamples, wh3 indicates ill reveal theected in thn most of tomp #26 wmaining sulpes, with Commaining sph
during the gs both puree gold was m peak overl out on trac
quartz vein,
N815 (A13575)
r Vista Gold
e taken onlyace cannotneralogy ofhich is to bemuch moree reason forhe samples,he samples
which had aphides, onlymp #16 andhalerite and
gold searche gold andmetallic andlap and thece platinum
, or close to
)
d
y t f e e r , s a y d d
h d d e
m
o
1.
The minCorpora The aim
The minproject Mineral
2.
The sam
Com
Com
Com
Com
Com
Com
INTRO
neralogical ation was re
m of the min
Gold miner
Modal mine
neralogical operator logy).
SAMPL
mple details
Samp
mp. #16 VB11
mp. #19 VB11
mp. #26 VB11
mp. #33 VB12
mp. #39 VB12
p. #91 VB12 –
ODUCTI
examinatioequested by
neralogical i
ral composi
eralogy of t
work was rand was u
LES REC
are listed in
ple Name
1 – 001 349 – 3
1 – 001 380 – 3
1 – 001 456 – 4
2 – 002 284 – 2
2 – 002 345 – 3
– 010 18.80 – 2
ON
on of six (6)y the ALS Am
investigatio
tion, occurr
the samples
requested bundertaken
CEIVED
n the table b
360 m
391 m
467 m
294 m
355 m
29.92 m
Page 1 of 8
core sampmmtec gold
ons is to cha
rence and a
s
by Mr Way and supe
D
below:
Sample Ty
Core
Core
ples from thd processing
aracterise th
ssociations
yne Hardingervised by
ype Ma
Mineralogy R
he Mt Todd g team.
he following
g (ALS AmmDr Chi Vi
ass % Retaine
N/A
N/A
Report No. MIN
Project for
g:
mtec) on beinh Ly (AL
ed MinSam
MIN
MIN
MIN
MIN
MIN
MIN
N815 (A13575)
r Vista Gold
ehalf of theLS Ammtec
neralogy mple No.
N815A1A
N815B1A
N815C1A
N815D1A
N815E1A
N815F1A
)
d
e c
3.
The qurectangwere thblocks wthe polisample
4. A
All samSEM Par The momode ofalse coelectronachieve15 μm. A brighbackscaScanner(Energy
5.
5.1
During Data va
SAMPL
artz vein rular blocks,
hen embeddwere cut baished sectio was then ca
ANALY
ples have brticle Scann
odal mineralof analysis molour imagen intensity t reasonable
ht mineral attering incr. All selec
y Dispersive
RESULT
Quantita
automated
lidation allo
LE PREP
running thr, containingded into a tck to expos
on holder, bearbon coate
YTICAL
been analyseer for the g
logical and tmode on thee of the sao infer the me analysis t
search focluding golcted grains Detector, E
TS
ative Min
analysis, the
owed simpli
PARAT
ough each this vein, wtwo-part epse a fresh suefore being
ed prior to in
PROCE
ed with QEMold mineral
textural anae QEMSCANmple. Themineralogy imes and re
or the phad-rich mine
s were indivDS, standard
neralogy
e data resul
fication of t
Page 2 of 8
ION
of the sawere cut fropoxy resin, aurface of the polished dntroduction
EDURE
MSCAN instl search.
alysis of the N, which raste system us of each pixeesolution a
ases with eral phasesvidually valdless).
and Gol
lted in an ex
the mineral
mples was m the receiand allowede sample anown to a 1 into the ins
ES
rument for
sample wasters over theses the chael in generall samples
high atoms was undlidated usin
d-Silver
xtensive min
list into foll
Mineralogy R
isolated aved core sad to set oved trimmed micron diamstrument fo
quantitative
s carried oute whole anaracteristic x
ation of the were run a
ic density ertaken wit
ng X-ray sp
Minerali
neral list.
owing mine
Report No. MIN
and thin seamples. Theernight. On down in sizmond paste
or analysis.
e mineralog
t using the alysis area gx-ray and b false colourt a pixel re
and stronth Zeiss SEpectrum sp
isation
eral groupin
N815 (A13575)
ection sizedese samplesnce set, theze to fit into finish. The
gy and Zeiss
Field Imageenerating a
back scatterr image. Toesolution of
ng electronEM Particleot analyses
ngs:
)
d s e o e
s
e a r o f
n e s
Min
P
Ch
S
Ar
M
C
F
Min
Mi
The quathe data
M
neral Group
Gold
Silver
Bismuth
Pyrite
Pyrrhotite
halcopyrite
Sphalerite
Galena
rsenopyrite
Quartz
Mica/Clays
arbonates
Fe Oxides
nor Silicates
inor Phases
antitative ma appear in
Mineral Group
Gold
Silver
Bismuth
Pyrite
Pyrrhotite
Chalcopyrit
Sphalerite
Galena
Arsenopyri
Quartz
Mica/Clay
Carbonate
Fe Oxides
Minor Silica
Minor Phas
Defined
Defined
Defined
mineralogy foAppendix I.
ping
e
te
e
ite
s
es
s
tes
ses
d as any pixel
d as any pixel
d as any pixel r
Predominant
Pred
or the samp
Comp. #16 V349 – 3
0.0
0.0
0.0
16.
0.2
0.9
0.0
0.0
0.0
75.
6.1
0.0
0.0
0.0
0.0
Page 3 of 8
Minera
l reporting Au
l reporting Ag
reporting Bi in
tly muscovite,
Predominan
dominantly goe
O
All
ples is show
MINERA
VB11 – 001 360 m
09
00
09
79
23
94
00
03
06
50
15
02
07
00
02
l Formula or
in the automa
in the automa
n the automate
FeS2
FeS(1-n) (n=0-0
FeCuS2
(Zn, Fe)S
PbS
FeAsS
SiO2
and secondary
ntly calcite and
oethitic/limonit
Other trace sili
ll other trace m
wn in the ta
AL MASS PERC
Comp. #19 380 –
0.0
0.0
0.0
37
0.0
0.0
0.0
0.1
0.0
56
0.1
5.9
0.0
0.0
0.0
Mineralogy R
Description
ated X-ray scan
ated X-ray sca
ted X-ray scan
0.17)
S
ry biotite, kaol
d minor dolom
tic hydrated iro
licates
minerals
bles below.
CENT (%) IN S
VB11 – 001 391 m
00
00
00
.33
03
06
01
18
00
.35
13
90
01
00
01
Report No. MIN
an (Mainly arge
an (Mainly silve
n (Mainly meta
linite and chlo
mite
on oxides
Bar charts
SAMPLE
Comp. #26 456 –
0.
0.
0.
0.
16
0.
0.
0.
0.
50
30
0.
0.
0.
0.
N815 (A13575)
entian gold)
er sulphide)
allic bismuth)
orite.
s illustrating
VB11 – 001 467 m
00
00
00
80
6.82
84
14
02
00
0.44
0.66
02
09
04
13
)
g
M
Mineral Group
Gold
Silver
Bismuth
Pyrite
Pyrrhotite
Chalcopyrit
Sphalerite
Galena
Arsenopyri
Quartz
Mica/Clay
Carbonate
Fe Oxides
Minor Silica
Minor Phas
The modal as indicativproduce stathe sampleexpected asmica/clays tthis. Asideincluding pdominant spyrrhotite gchalcopyriteComp #26 galena in th
From the manalysis it argentian gand could cthe high bplatinum pr
ping
e
te
e
ite
s
es
s
tes
ses
mineralogive values, atistically ros does shows the quartzthan quartze from theyrite, pyrrhosulphide is grain detecte shows a showing ne
he samples w
manual SEMwas found
gold. It wascontain a v
bismuth pearesent with
Comp. #33 V284 – 2
0.0
0.0
0.0
4.0
0.1
0.0
0.0
0.0
0.0
12.
70.
2.1
1.6
7.0
2.0
cal data obas measure
obust minerw dominancz vein was t, and later e
e silicates, sotite, chalco pyrite, witted in the msignificant
early 1% chwere only d
M EDS analy that the ms also foundery trace amak height ethe bismuth
Page 4 of 8
MINERA
VB12 – 002 294 m
00
00
00
04
12
07
08
04
00
16
68
12
62
00
08
btained for tement of aral populatice of quartztargeted. Inexaminationseveral sulp
opyrite, sphath the nota
measuremenoccurrence
halcopyrite cdetected at t
ysis of the dmajority of d that the bmount of pexact quanth.
AL MASS PERC
Comp. #39 345 –
0.0
0.0
0.0
13
0.4
0.0
0.0
0.0
0.0
26
58
0.6
0.0
0.2
0.2
the 6 polisha single 2Dions. Howez and mica/cnterestinglyn of the minphides weralerite and gable exceptnt area. Of in the VB1concentratiotrace amoun
detected gothe gold o
bismuth detlatinum. H
tification co
Mineralogy R
CENT (%) IN S
VB12 – 002 355 m
00
00
00
.30
41
06
00
04
00
.99
.00
64
09
24
22
hed sectionsD cross-secever, the indclays in all s, Comp #33eral map wie also detegalena. In mtion of Cothe remaini11 sampleson. The remnts.
old grains doccurred astected with owever, du
ould not be
Report No. MIN
SAMPLE
Comp. #91 18.80 –
0.
0.
0.
23
0.
0.
0.
0.
0.
57
14
0.
3.
0.
0.
s should bectional surfdicative misamples, wh3 indicates ill reveal theected in th
most of the smp #26 wing sulphid
s, with Commaining sph
during the gs both pure the gold we to peak o
e carried ou
N815 (A13575)
VB12 – 010 29.92 m
02
00
02
.50
46
09
00
00
00
7.58
4.53
10
62
02
05
e taken onlyace cannotneralogy of
hich is to bemuch moree reason forhe samples,samples the
with a largees, only the
mp #16 andhalerite and
gold searche gold andwas metallicoverlap andut on trace
)
y t f e e r ,
e e e d d
h d c d e
5.2
The avemineralgrain sisome mparticle
M
Calculate
erage grainl grains andizes are to
minor miner selection.
Mineral Group
Gold
Silver
Bismuth
Pyrite
Pyrrhotite
Chalcopyrit
Sphalerite
Galena
Arsenopyri
Quartz
Mica/Clay
Carbonate
Fe Oxides
Minor Silica
Minor Phas
ed Partic
n size estimd approxima
some exterals can be
ping
e
te
e
ite
s
es
s
tes
ses
cle and G
mations are ated to sphnt under-es affected by
Comp. #16 V349 – 3
27
26
25
29
44
23
48
43
10
72
78
45
59
34
43
Page 5 of 8
Grain Size
produced heres of a cstimated esy the small
AVERA
VB11 – 001 360 m
7
6
5
97
4
32
8
3
02
29
8
5
9
4
3
e
from two-certain diamspecially in l number of
AGE PARTICLE(μm
Comp. #19 380 –
0
2
0
84
3
4
3
4
4
21
8
43
5
3
3
Mineralogy R
dimensionameter. Typic
an unsizedf grains inte
E AND GRAINm) VB11 – 001 391 m
0
3
0
43
7
1
6
7
5
43
7
39
2
1
4
Report No. MIN
al random cally both p
d sample. Sercepted w
N SIZES
Comp. #26 456 –
2
0
2
9
33
11
9
3
3
15
9
4
4
3
3
N815 (A13575)
sections ofparticle andStatistics of
with random
VB11 – 001 467 m
25
0
25
91
36
18
91
33
34
59
92
45
47
32
34
)
f d f
m
M
Mineral Group
Gold
Silver
Bismuth
Pyrite
Pyrrhotite
Chalcopyrit
Sphalerite
Galena
Arsenopyri
Quartz
Mica/Clay
Carbonate
Fe Oxides
Minor Silica
Minor Phas
The calculaas the size occur as “g
Of the minrelative to which are aThe other sdata suggethat the minsufficient
It should albeen givenmeans the
ping
e
te
e
ite
s
es
s
tes
ses
ted average for the bulrains”.
erals forminthe other m
also the twosilicates in test coarse m
mica/clays ar to different
lso be note here, they minimal rep
Comp. #33 V284 – 2
0
0
0
27
35
53
31
27
32
32
11
49
25
28
24
e grain size k material w
ng “grains” minerals, aso samples whe sample a
mica/clays, tre fine graitiate the ind
d that the a only represportable gra
Page 6 of 8
AVERA
VB12 – 002 294 m
0
0
0
77
5
3
1
7
2
2
19
9
5
8
4
data providwall rock an
in the samps is the chawhich contaare generalthe textural ined. This dividual grai
although essent the upain size is ~2
AGE PARTICLE(μm
Comp. #39 345 –
0
0
0
35
5
4
4
7
10
8
15
8
2
2
2
ded here shond vein will
ple, the pyralcopyrite inain the highly fine. It s data from is because
ins.
stimates of pper limit as22 μm.
Mineralogy R
E AND GRAINm) VB12 – 002 355 m
0
0
0
51
4
6
0
6
06
1
57
9
9
6
9
ould be take be over es
rite and pyrn the Compest concenthould be nothe minera the resolut
the gold ans the analys
Report No. MIN
N SIZES
Comp. #91 18.80 –
2
0
2
26
2
6
3
0
7
26
6
3
10
3
3
en as indicastimated as
rrhotite are p #16 and tration of coted that al
al maps woution of the
nd silver grasis resolutio
N815 (A13575)
VB12 – 010 29.92 m
26
0
24
60
29
66
35
0
72
65
68
35
03
37
38
ative values,it does not
very coarseComp #26,halcopyrite.lthough theuld suggest
e analysis is
ain size hasn at 15 μm
)
, t
e , .
e t s
s m
5.3
A false sample, Field im 5.3.1
The minpyrite amica/clagrainedthe goldwith meclearly small gothe mic 5.3.2
The minwith noinclusiocalcite During in the qdue to t 5.3.3
The falshost wathroughsparselypyrrhotsome mmineralcapturesphalerigrain inThe fielquartz v
Textural
colour min, with both m
mages illustr
Comp #16
neral map ond chalcopyay intrusion
d with intergd deportmeetallic bismureflects the old pixels (reous wall ro
Comp #19
neral map o evidence o
ons are cleamineralisatithe gold se
quartz vein. the small nu
Comp #26
se colour mall rock of hout the samy populatedite minerali
mineralisatiolisation, boted in the anite mineralis
ntergrown wld scan was vein.
l Indicati
neral map omineralogic
ating miner
6 VB11-00
of this sampyrite inclusion has also bgrowths of ent in the veuth also inte gold mine
red) dissemiock.
9 VB11-00
of this sampof the mica/crly seen in ion with tharch analys However, umber and s
6 VB11-00
mineral map mica/clay mple with ad by mica/clsation, mainon of chalcth pyrrhotitalysis area isation in the
with pyrrhot also able t
ions (Part
of the sampcal informati
ral maps and
1 349-360
le clearly shons, and finbeen measuquartz. Froein show a erspersed w
eralisation, winated throu
1 380-39
ple also shoclay wall rocthe false co
he pyrite whis only a sinno gold gr
size of the g
1 456-465
of this sammineralogyn area of delay. Unlike nly as a largcopyrite witte and chalis a fracturee sample. Tite/pyrite ano detect a f
Page 7 of 8
ticle Ima
ple is produion and text
d textural ch
0 m
hows the quner grain pyrured and thom the goldnuggety go
with the golwith carefulughout the
1m
ows the quack. As with olour minerhich is not
ngle argentiaains were d
gold grains p
5 m
mple vividlyy. The graenser “large the other V
ge intrusion thin it, but lcopyrite, we near the “The gold send again alsfew pixels o
ages)
uced duringtural inform
haracteristic
artz vein, tarrhotite inclhe image shd search anold dissemind. The greyl examinatioquartz vein,
artz vein dothe VB11-0ral map, bu seen in than gold gra
detected dupresent in th
y shows theain size of er” mica/clayVB11-001 sa at the “top there is a
within the wbase” of thearch analysiso in close of gold alon
Mineralogy R
g the Field ation obtain
c appear in A
argeted for tusions. Withows that talysis of thenated throuy scale imagon of the im, with little t
ominating th01 349-360 t the samphe other twin of ~20 μring the fiehe sample.
quartz veinthe mica/c
y grains andamples, this” of the vein
also a smalwall rock. Ae vein whichis also only association ng a fractur
Report No. MIN
Image ananable from
Appendix II.
this analysisthin the anathe mica/clae sample, e
ughout the qge of the samage reveato none bei
he entire fie m sample, le also show
wo VB11-00m in size w
eld scan, wh
n running tclay seems d areas whics sample shn. The vein ll amount oAn interesth also carrie detected a with metalre running t
N815 (A13575)
lysis of thethe image.
.
s, with largealysis area, aays are fineexamples ofquartz vein,ample morealing all theng found in
eld of view,large pyritews areas of01 samples.as detected
hich may be
through the to changech are moreows mainly also showsof sulphideting featurees the main single goldlic bismuth.through the
)
e
e a e f ,
e e n
, e f .
d e
e e e y s e e n d .
e
5.3.4
The mindenselythan qucalcite avein. Nsample. 5.3.5
The falsmica/clapyrite agold sea 5.3.6
The falsvein divveins. Avein, wpreviouoxide. Aseveral bismuth
Comp #33
neral map fy mineralizeuartz and thand pyrite mo gold was .
Comp. #3
se colour may wall rocknd calcite march analysi
Comp. #9
se colour imverging intoAs with the ith pyrite bs samples tAlthough nsingle pixe
h.
3 VB12-00
for this samed mica/clayhe other is mineralizatio detected ei
9 VB12–00
ineral map k matrix. Asmineralisatiois or the fiel
1 VB12–01
mage obtaino two separa previous sabeing the mthe pyrite mo gold was
el sized go
2 284-294
mple shows ys. One of heavily inton, with evidither during
02 45–355
of this samp with the pr
on. As with ld scan analy
10 18.80–
ned for this ate veins, wamples thermain sulphi
mineralisatio detected dld grains, w
Page 8 of 8
4 m
two veins the veins itergrown widence of qu
g the gold se
5 m
ple also clerevious sam the previoulysis.
–29.92 m
sample repwith the micre is significide mineral
on seems toduring the gwhich are a
running thris, howeverith pyrite. uartz veiningearch analys
arly shows tmple the qua
us sample n
presents a seca/clay wall ant sulphidl detected also be clo
gold search, all closely a
Mineralogy R
rough the h, dominatedThe mica/c
g along the sis or the fie
the quartz vartz vein is hno gold was
ection of throck interpe mineralisain the sam
osely associa the field imassociated a
Report No. MIN
host rock cod by mica/cclay vein als two boundeld scan ana
vein runningheavily inters detected e
he core withosed betweation within
mple. Howeated with a
mage analysalso with t
N815 (A13575)
onsisting ofclays ratherso contains
daries of thealysis of this
g through argrown witheither in the
h the quartzeen the twon the quartzever, unlikereas of ironsis detectedthe metallic
)
f r s e s
a h e
z o z e n d c
MINEERALO
OGY AAPPEN
Mineralogy R
NDICE
Report No. MIN
ES
N815 (A13575))
Qu
uantitatiDetect
MINAP
ive Mineted Gold
NERALPPEND
eralogyd-Silver
LOGY DIX I
y and SEr Minera
Mineralogy R
EM Imagal Grain
Report No. MIN
ges of ns
N815 (A13575))
Mas
s (%
)
Ap
ppendix I - Pagge 1 Mineralogy RReport No. MINN815 (A13575))
G
Grai
Gr
rain 2 – Metallic Bi
Grain 3 - –
Grain 4 – Met
Grain 9 – Met
in 10 – Au/Bi alloy?
rain 1 – 74% Au – 2
i
– Metallic Bi
tallic Bi
tallic Bi
?
Ap
VB1
26% Ag
Grain 8 – Meta
ppendix I - Pag
11-001 349
Field On
NB: Galen
allic Bi
ge 2
9-360 m
ne
na
Mineralogy R
Grain 6
Grain 7 – Met
Matri
Report No. MIN
Grain 5 – 77% A
6 – 75% Au – 25% A
tallic Bi
ix – Quartz
N815 (A13575)
Au – 23% Ag
Ag
)
G
Grain 3
rain 1 – Metallic Bi
Ap
– 100% Au
Ma
ppendix I - Pag
Field Tw
atrix – Quartz
ge 3
wo
Grain
Grain 2
Mineralogy R
1 – 100% Au
– Metallic Bi
Report No. MINN815 (A13575)
)
Grain 5
Grain 2 – 77%
5 – Metallic Bi
Ap
Au – 23% Ag
ppendix I - Pag
Field Thre
G
ge 4
ree
Grain 1 – 93% Au –
Mineralogy R
– 7% Ag
Grain 3 – A
Matr
Report No. MIN
Au/Bi Alloy?
Grain 4
rix – Quartz
N815 (A13575)
4 – Metallic Bi
)
Grain 2 – Met
Ap
tallic Bi
Matrix 2 – Quartz
ppendix I - Pag
Field Fou
z
ge 5
ur
Grain 1 –
Mineralogy R
79% Au – 21% Ag
Report No. MIN
Multiple Grain – G
N815 (A13575)
Matrix 1 – Pyrite
Galena
)
Grain 5 –
Ap
VB1
– 92% Au – 8% Ag
ppendix I - Pag
11-001 380
Field On
ge 6
0-391 m
ne
Mineralogy RReport No. MINN815 (A13575)
)
Silicate – Iron A
Ap
VB1
luminosilicate
ppendix I - Pag
11-001 456
Field On
Grain 2 – Metall
ge 7
6-467m
ne
Grain 1 – 78%
lic Bi
Mineralogy R
% Au – 22% Ag
Matrix
Report No. MIN
x – Pyrrhotite
N815 (A13575)
)
MINAP
Par
NERALPPEND
rticle Im
LOGY DIX II
mages
Mineralogy RReport No. MINN815 (A13575))
The c
colour le
Full Co
BaGoSilvBisPyrPyrChSpGaArsQuMicCaFe MinMin
Ap
egend is apresen
olour Legen
ckgrounldversmuthriterrhotitealcopyrhaleritelenasenopyrartz
ca/Clayrbonate Oxidesnor Silicnor Pha
ppendix II - Pag
applicabnted in th
nd
nd
ritee
rite
ses
catesses
ge 1
ble to all his report
Grey S
BacGolSilvBisPyrPyrChaSphGalArsQuaMicCarFe OMinMin
Minera
Mineralogy R
l particle rt.
Scale Legen
ckgrounldvermuthriterrhotitealcopyrihaleritelenasenopyriartza/ClaysrbonatesOxides
nor Silicanor Phas
al Nam
Report No. MIN
images
nd
d
te
ite
s
atesses
e
N815 (A13575)
)
Comp. #16
Ap
16 VB11 – 00
ppendix II - Pag
001 349-360
ge 2
0 m (Full Co
Mineralogy R
olour Legen
Report No. MIN
nd)
N815 (A13575)
)
Comp. #1
Ap
16 VB11 – 0
ppendix II - Pag
001 349-360
ge 3
60 m (Grey S
Mineralogy R
Scale Legen
Report No. MIN
nd)
N815 (A13575)
)
Comp. #19
Ap
19 VB11 – 00
ppendix II - Pag
001 380-391
ge 4
1 m (Full Co
Mineralogy R
olour Legen
Report No. MIN
nd)
N815 (A13575)
)
Comp. #1
Ap
19 VB11 – 0
ppendix II - Pag
001 380-391
ge 5
1 m (Grey S
Mineralogy R
Scale Legen
Report No. MIN
nd)
N815 (A13575)
)
Comp. #26
Ap
26 VB11 – 00
ppendix II - Pag
001 456-467
ge 6
7 m (Full Co
Mineralogy R
olour Legen
Report No. MIN
nd)
N815 (A13575)
)
Comp. # 2
Ap
26 VB11 – 0
ppendix II - Pag
001 456-467
ge 7
7 m (Full Co
Mineralogy R
Colour Legen
Report No. MIN
end)
N815 (A13575)
)
Comp. #3
Ap
33 VB12 – 00
ppendix II - Pag
002 284-294
ge 8
4 m (Full Co
Mineralogy R
olour Legen
Report No. MIN
nd)
N815 (A13575)
)
Comp. #3
Ap
33 VB12 – 0
ppendix II - Pag
002 284-294
ge 9
4 m (Grey S
Mineralogy R
Scale Legen
Report No. MIN
nd)
N815 (A13575)
)
Comp. #39
App
39 VB12 – 00
ppendix II - Pag
002 345-355
ge 10
5 m (Full Co
Mineralogy R
olour Legen
Report No. MIN
nd)
N815 (A13575)
)
Comp. #3
App
39 VB12 – 0
ppendix II - Pag
002 345-355
ge 11
5 m (Grey L
Mineralogy R
Level Legen
Report No. MIN
nd)
N815 (A13575)
)
C
Comp. #91 V
App
VB12 – 010
ppendix II - Pag
0 18.80-29.9
ge 12
92 m (Full C
Mineralogy R
Colour Leg
Report No. MIN
gend)
N815 (A13575)
)
C
Comp. #91
App
1 VB12 – 010
ppendix II - Pag
0 18.80-29.
ge 13
.92 m (Grey
Mineralogy R
y Scale Lege
Report No. MIN
gend)
N815 (A13575)
)
PROJECT A13575
CLIENT VISTA GOLD CORPORATION
TEST DESCRIPTION DRY LIMS MAGNETIC SEPARATION TESTWORK @ 1100G
VB11 003 519-535m COMPOSITE # 79
GRIND P100 : 3.35 mm
DATE Aug-11
MASS
(g) Au, g/t Ag, ppm Cu, ppm Fe, % S, % Mass Au Ag Cu Fe S
MAGS 416.7 0.34 0.6 645 6.34 1.34 8.34 18.09 26.68 27.46 11.01 30.33
NON‐MAGS 4580.7 0.14 0.15 155 4.66 0.28 91.66 81.91 73.32 72.54 88.99 69.67
CALC. FEED 4997.4 0.16 0.19 196 4.80 0.37 100.00 100.00 100.00 100.00 100.00 100.00
ASSAY FEED 5000
SAMPLE
STREAMASSAY Distribution [%]
Report No. A13575 Part 1
APPENDIX XIII
Variability Composites (99 Samples)
Head Analysis
Details and Results
ANALYTE UNIT
Au1 g/t 0.42 0.43 1.29 2.16 1.53
Au2 g/t 0.43 0.42 1.20 2.28 1.47
Au3 g/t n/a n/a n/a 2.43 n/a
Au4 g/t n/a n/a n/a 2.37 n/a
Ag g/t 0.3 2.5 1.0 1.1 0.8
As ppm 50 50 30 40 20
Al % 6.76 6.92 6.24 6.48 6.08
Ba ppm 400 400 400 300 300
Be ppm 2.2 2.4 1.9 2.1 1.8
Bi ppm < 10 < 10 < 10 < 10 < 10Ctotal % 0.15 0.33 0.21 0.18 0.24
Corganic % < 0.03 < 0.03 0.06 0.06 0.09
CO32-
% 0.75 1.65 1.05 0.90 1.20
Ca ppm 7000 7000 4000 4000 4000
Cd ppm < 5 10 < 5 < 5 < 5
Co ppm 25 25 20 25 20
Cr ppm 50 40 60 50 40
Cu ppm 108 168 346 414 656
CN Sol. Cu ppm 26 34 144 116 274
Fe % 5.08 4.90 5.32 5.80 5.20
Hg ppm < 0.1 < 0.1 < 0.1 < 0.1 < 0.1
K % 2.60 2.80 2.80 3.00 2.60
Li ppm 20 20 15 15 10
Mg % 1.32 1.36 1.12 1.16 1.00
Mn ppm 500 700 400 400 300
Mo ppm < 5 < 5 < 5 < 5 < 5
Na ppm 8640 4220 540 440 500
Ni ppm 55 45 45 40 40
P ppm 600 600 600 600 500
Pb ppm 115 3945 170 140 140Stotal % 0.48 0.92 1.34 1.76 1.66
Ssulfide % 0.40 0.80 1.10 1.48 1.38
Sb ppm 2.5 2.7 1.2 1.1 1.2SiO2 % 66.0 63.4 63.4 62.8 62.8
Sn ppm 50 50 50 50 50
Sr ppm 36 32 16 16 8
Te ppm < 0.2 < 0.2 < 0.2 < 0.2 0.2
Th ppm 14 16 12 14 12
Ti ppm 4000 3800 3800 3600 3400
U ppm 3.3 3.6 3.3 3.4 3.4
V ppm 108 96 98 98 88
Y ppm 26 24 24 24 22
Zn ppm 704 5128 468 246 470
Zr ppm 175 155 175 160 175
True SG g/mL 2.7792 2.7761 2.8051 2.7750 2.8073
COMPOSITE #4
COMPOSITE #5
COMPOSITE #1
COMPOSITE #2
COMPOSITE #3
COMPREHENSIVE HEAD ANALYSIS: VARIABILITY COMPOSITES
A13575 MT TODD PROJECT FEASBILITY STUDY
VISTA GOLD CORPORATION
ANALYTE UNIT
Au1 g/t 1.62 1.76 1.89 1.35 0.91
Au2 g/t 1.58 1.83 2.04 1.36 0.87
Au3 g/t n/a n/a 2.28 n/a n/a
Au4 g/t n/a n/a 1.92 n/a n/a
Ag g/t 1.2 1.5 1.2 1.1 0.9
As ppm 40 50 30 70 40
Al % 5.88 6.48 5.68 6.00 5.92
Ba ppm 300 300 300 300 300
Be ppm 1.9 2.1 1.8 1.9 1.9
Bi ppm < 0.1 < 0.1 < 0.1 < 0.1 < 0.1Ctotal % 0.24 0.18 0.15 0.12 0.12
Corganic % < 0.03 < 0.03 < 0.03 < 0.03 < 0.03
CO32-
% 1.20 0.90 0.75 0.60 0.60
Ca ppm 4000 4000 3000 3000 3000
Cd ppm < 5 < 5 < 5 < 5 < 5
Co ppm 20 20 20 35 25
Cr ppm 40 40 40 50 40
Cu ppm 454 570 698 470 384
CN Sol. Cu ppm 220 284 360 228 170
Fe % 4.68 5.76 5.06 5.50 4.94
Hg ppm 0.7 < 0.1 < 0.1 < 0.1 < 0.1
K % 2.40 2.60 2.40 2.40 2.40
Li ppm 15 20 20 15 15
Mg % 1.08 1.20 1.00 1.24 1.24
Mn ppm 300 300 300 400 400
Mo ppm < 5 < 5 < 5 < 5 < 5
Na ppm 540 320 400 220 480
Ni ppm 40 45 35 40 40
P ppm 600 600 600 700 600
Pb ppm 665 365 655 1100 415Stotal % 1.40 1.56 1.54 1.52 1.24
Ssulfide % 1.20 1.36 1.32 1.24 1.06
Sb ppm 14.3 1.5 1.7 1.5 1.4SiO2 % 55.0 66.6 57.2 66.6 62.2
Sn ppm < 50 < 50 100 50 < 50
Sr ppm 10 10 12 16 12
Te ppm < 0.2 < 0.2 < 0.2 < 0.2 < 0.2
Th ppm 12 12 12 14 12
Ti ppm 3200 3800 3200 3800 3600
U ppm 3.2 3.1 3.2 3.1 3.3
V ppm 94 90 94 100 98
Y ppm 22 24 22 24 22
Zn ppm 1030 894 1018 742 1720
Zr ppm 170 160 165 170 180
True SG g/mL 2.8121 2.7733 2.8195 2.7868 2.7992
COMPOSITE #9
COMPOSITE #10
COMPOSITE #7
COMPOSITE #8
COMPOSITE #6
ANALYTE UNIT
Au1 g/t 0.70 1.08 1.01 0.42 0.54
Au2 g/t 0.70 1.08 0.98 0.42 0.51
Au3 g/t n/a n/a n/a n/a n/a
Au4 g/t n/a n/a n/a n/a n/a
Ag g/t 1.2 1.0 1.2 3.1 1.0
As ppm 40 40 70 190 50
Al % 6.20 6.92 7.68 7.16 6.60
Ba ppm 300 400 500 400 400
Be ppm 2.0 2.7 3.1 2.8 1.8
Bi ppm < 10 < 10 < 10 < 10 < 10Ctotal % 0.15 0.24 0.12 0.21 0.15
Corganic % < 0.03 < 0.03 < 0.03 < 0.03 < 0.03
CO32-
% 0.75 1.20 0.60 0.65 0.75
Ca ppm 3000 4000 3000 6000 4000
Cd ppm 5 5 5 15 < 5
Co ppm 20 25 25 25 20
Cr ppm 40 50 50 40 50
Cu ppm 362 330 228 732 886
CN Sol. Cu ppm 158 156 80 210 438
Fe % 4.78 5.16 5.74 5.16 5.32
Hg ppm < 0.1 < 0.1 < 0.1 < 0.1 < 0.1
K % 2.40 2.80 3.20 2.80 2.80
Li ppm 20 20 20 25 15
Mg % 1.28 1.24 1.32 1.64 1.20
Mn ppm 400 400 400 400 300
Mo ppm < 5 < 5 < 5 < 5 < 5
Na ppm 540 1660 800 460 1480
Ni ppm 40 40 35 35 50
P ppm 600 600 800 600 600
Pb ppm 825 540 865 6135 350Stotal % 0.92 1.02 1.30 1.38 1.34
Ssulfide % 0.70 0.88 1.12 1.06 1.12
Sb ppm 1.4 1.8 2.2 6.4 1.2SiO2 % 66.8 58.0 59.8 60.8 67.8
Sn ppm < 50 < 50 100 < 50 50
Sr ppm 14 16 18 12 10
Te ppm < 0.2 < 0.2 < 0.2 < 0.2 < 0.2
Th ppm 12 14 16 14 14
Ti ppm 3800 3400 3600 3400 3600
U ppm 3.1 3.5 3.9 3.5 3.1
V ppm 92 96 84 86 86
Y ppm 24 24 28 26 24
Zn ppm 2166 2222 2782 4580 600
Zr ppm 155 160 165 150 160
True SG g/mL 2.7480 2.7983 2.7799 2.8117 2.7554
COMPOSITE #11
COMPOSITE #12
COMPOSITE #13
COMPOSITE #14
COMPOSITE #15
ANALYTE UNIT
Au1 g/t 1.79 1.20 0.93 0.54 1.32
Au2 g/t 1.93 1.22 1.16 0.53 1.32
Au3 g/t 1.81 n/a 1.01 n/a n/a
Au4 g/t 1.86 n/a 0.95 n/a n/a
Ag g/t 1.4 0.8 2.3 2.2 2.1
As ppm 820 20 120 970 410
Al % 6.92 7.00 7.56 6.76 6.72
Ba ppm 500 500 400 400 300
Be ppm 2.4 2.0 2.7 10.8 2.7
Bi ppm < 10 < 10 < 10 < 10 < 10Ctotal % 0.06 0.06 0.39 0.36 0.81
Corganic % < 0.03 < 0.03 < 0.03 < 0.03 < 0.03
CO32-
% 0.30 0.30 1.95 1.80 4.05
Ca ppm 2000 2000 5000 6000 15000
Cd ppm < 5 < 5 < 5 < 5 10.00
Co ppm 20 15 50 230 40
Cr ppm 40 40 50 50 50
Cu ppm 592 540 1014 1546 1118
CN Sol. Cu ppm 258 156 420 638 508
Fe % 4.52 5.10 5.22 4.72 4.88
Hg ppm < 0.1 < 0.1 < 0.1 < 0.1 < 0.1
K % 2.80 3.00 3.20 2.60 2.80
Li ppm 20 15 25 25 25
Mg % 1.16 1.16 1.64 1.44 1.92
Mn ppm 200 200 500 600 600
Mo ppm < 5 < 5 < 5 < 5 < 5
Na ppm 680 920 340 540 260
Ni ppm 25 35 50 85 40
P ppm 500 500 600 600 700
Pb ppm 195 45 485 620 665Stotal % 1.34 1.56 1.30 1.32 1.74
Ssulfide % 1.08 1.24 1.20 1.22 1.48
Sb ppm 1.7 0.6 2.8 7.1 3.2SiO2 % 62.6 63.6 61.0 64.6 62.0
Sn ppm 100 100 50 50 100
Sr ppm 8 8 12 8 10
Te ppm 0.4 0.6 < 0.2 < 0.2 0.4
Th ppm 16 14 16 14 14
Ti ppm 2600 3000 3400 3400 3200
U ppm 4.3 3.6 3.4 3.1 3.0
V ppm 60 72 80 84 78
Y ppm 26 24 28 24 24
Zn ppm 188 48 1008 972 4654
Zr ppm 170 165 145 150 140
True SG g/mL 2.7564 2.7994 2.7898 2.8844 2.8167
COMPOSITE #17
COMPOSITE #18
COMPOSITE #19
COMPOSITE #16
COMPOSITE #20
ANALYTE UNIT
Au1 g/t 1.22 0.86 0.90 1.46 1.93
Au2 g/t 1.14 0.74 0.72 1.43 2.14
Au3 g/t n/a 0.95 1.00 n/a 2.10
Au4 g/t n/a 1.01 0.84 n/a 2.23
Ag g/t 1.1 0.4 0.4 0.5 1.0
As ppm 30 20 10 180 30
Al % 7.52 6.80 7.88 8.08 7.08
Ba ppm 400 700 500 500 500
Be ppm 2.7 2.6 2.3 2.5 2.6
Bi ppm < 10 < 10 < 10 < 10 < 10Ctotal % < 0.03 < 0.03 0.03 0.09 0.06
Corganic % < 0.03 < 0.03 < 0.03 < 0.03 < 0.03
CO32-
% < 0.03 < 0.03 0.15 0.45 0.30
Ca ppm 2000 2000 3000 2000 2000
Cd ppm < 5 < 5 < 5 < 5 < 5
Co ppm 20 15 15 20 15
Cr ppm 50 50 40 50 20
Cu ppm 1100 510 522 464 742
CN Sol. Cu ppm 480 100 78 106 210
Fe % 5.60 4.88 5.62 5.60 4.68
Hg ppm < 0.1 < 0.1 3.2 < 0.1 < 0.1
K % 3.20 3.20 3.80 3.60 3.60
Li ppm 20 20 20 15 15
Mg % 1.20 1.08 1.12 1.16 0.80
Mn ppm 200 200 300 200 200
Mo ppm < 5 < 5 < 5 < 5 < 5
Na ppm 580 720 180 640 520
Ni ppm 40 40 40 35 25
P ppm 700 600 600 600 500
Pb ppm 340 40 35 55 60Stotal % 2.06 1.50 1.48 1.60 1.66
Ssulfide % 1.70 1.16 1.20 1.16 1.42
Sb ppm 1.1 0.8 0.6 0.7 0.5SiO2 % 62.4 55.6 63.0 61.2 66.2
Sn ppm 100 50 100 100 100
Sr ppm 12 10 16 10 10
Te ppm < 0.2 0.2 < 0.2 < 0.2 0.2
Th ppm 14 12 14 16 20
Ti ppm 3400 3200 3600 3200 2000
U ppm 3.3 3.5 2.3 3.9 4.7
V ppm 86 86 66 74 36
Y ppm 24 22 26 26 28
Zn ppm 562 80 38 36 56
Zr ppm 145 150 55 150 140
True SG g/mL 2.7880 2.8099 2.7746 2.8277 2.7527
COMPOSITE #21
COMPOSITE #22
COMPOSITE #23
COMPOSITE #24
COMPOSITE #25
ANALYTE UNIT
Au1 g/t 1.01 0.71 0.51 2.31 3.83
Au2 g/t 1.04 0.70 0.54 2.35 3.76
Au3 g/t n/a n/a n/a n/a n/a
Au4 g/t n/a n/a n/a n/a n/a
Ag g/t 0.6 0.5 0.5 1.4 1.9
As ppm < 10 60 50 110 11100
Al % 8.84 9.20 8.72 7.60 6.44
Ba ppm 600 600 600 700 700
Be ppm 3.0 3.2 2.5 3.1 2.6
Bi ppm < 10 < 10 < 10 < 10 < 10Ctotal % < 0.03 < 0.03 < 0.03 0.06 0.12
Corganic % < 0.03 < 0.03 < 0.03 < 0.03 < 0.03
CO32-
% < 0.03 < 0.03 < 0.03 30.00 0.60
Ca ppm 2000 3000 3000 2000 3000
Cd ppm < 5 < 5 < 5 < 5 30
Co ppm 15 20 15 20 25
Cr ppm 50 60 50 50 30
Cu ppm 662 4740 522 528 680
CN Sol. Cu ppm 122 96 96 238 268
Fe % 5.88 5.68 5.62 5.00 4.78
Hg ppm < 0.1 < 0.1 < 0.1 < 0.1 < 0.1
K % 4.40 4.20 4.00 3.20 2.60
Li ppm 20 25 20 20 15
Mg % 1.20 1.24 1.04 1.24 0.92
Mn ppm 200 300 200 300 200
Mo ppm < 5 < 5 < 5 < 5 < 5
Na ppm 680 1040 2400 3360 3860
Ni ppm 40 40 40 35 30
P ppm 600 600 600 600 500
Pb ppm 50 55 40 335 190Stotal % 1.56 1.10 1.38 0.90 2.10
Ssulfide % 1.24 0.88 1.02 0.72 1.98
Sb ppm 0.8 1.8 0.4 1.3 5.8SiO2 % 60.8 58.8 61.4 65.4 66.0
Sn ppm 100 150 50 100 < 50
Sr ppm 10 10 12 12 10
Te ppm < 0.2 < 0.2 < 0.2 0.2 0.4
Th ppm 18 16 18 18 16
Ti ppm 3600 3600 3600 3200 2000
U ppm 3.4 3.6 3.6 3.7 4.1
V ppm 84 88 76 76 40
Y ppm 28 28 28 28 28
Zn ppm 70 108 42 766 446
Zr ppm 145 140 150 170 165
True SG g/mL 2.8111 2.7773 2.7981 2.7987 2.7904
VISTA GOLD CORPORATION
A13575 MT TODD PROJECT FEASBILITY STUDY
COMPREHENSIVE HEAD ANALYSIS: VARIABILITY COMPOSITES
COMPOSITE #26
COMPOSITE #27
COMPOSITE #28
COMPOSITE #29
COMPOSITE #30
ANALYTE UNIT
Au1 g/t 0.57 0.33 0.23 0.39 0.36
Au2 g/t 0.52 0.36 0.22 0.37 0.39
Au3 g/t n/a n/a n/a n/a n/a
Au4 g/t n/a n/a n/a n/a n/a
Ag g/t 1.1 1.0 1.0 8.4 1.4
As ppm 110 150 40 140 50
Al % 7.28 5.80 8.48 7.36 6.64
Ba ppm 700 400 500 500 400
Be ppm 3.0 2.9 3.4 5.1 4.0
Bi ppm < 10 < 10 < 10 < 10 < 10Ctotal % 0.09 0.51 0.18 0.63 0.18
Corganic % < 0.03 0.06 < 0.03 < 0.03 < 0.03
CO32-
% 0.45 2.55 0.90 3.15 0.90
Ca ppm 3000 7000 4000 7000 4000
Cd ppm < 5 < 5 < 5 25 5
Co ppm 15 35 20 60 25
Cr ppm 30 40 50 50 50
Cu ppm 250 156 122 762 312
CN Sol. Cu ppm 104 60 66 72 90
Fe % 4.20 3.80 5.12 5.40 4.88
Hg ppm < 0.1 < 0.1 < 0.1 < 0.1 < 0.1
K % 3.00 2.40 3.40 3.40 3.00
Li ppm 25 25 25 25 20
Mg % 1.32 1.40 1.56 2.04 1.32
Mn ppm 300 400 400 900 400
Mo ppm < 5 < 5 < 5 < 5 < 5
Na ppm 1680 1340 2600 1000 2300
Ni ppm 25 45 30 50 45
P ppm 500 600 700 400 400
Pb ppm 535 715 200 2110 545Stotal % 0.52 0.40 0.30 0.90 1.04
Ssulfide % 0.48 0.32 0.22 0.90 1.04
Sb ppm 1.5 3.6 1.6 5.7 2.0SiO2 % 68.8 55.2 61.6 59.4 66.8
Sn ppm 150 50 50 < 50 50
Sr ppm 8 12 14 8 10
Te ppm < 0.2 < 0.2 < 0.2 0.6 0.4
Th ppm 18 12 18 16 14
Ti ppm 2800 2800 3400 3400 3600
U ppm 4.1 3.1 3.6 3.0 3.2
V ppm 58 80 82 84 88
Y ppm 28 20 28 26 22
Zn ppm 750 614 450 7402 2014
Zr ppm 185 150 155 140 165
True SG g/mL 2.7729 2.7434 2.7919 2.8326 2.7989
COMPOSITE #32
COMPOSITE #33
COMPOSITE #34
COMPOSITE #35
COMPOSITE #31
ANALYTE UNIT
Au1 g/t 0.86 1.25 0.75 3.04 1.04
Au2 g/t 0.91 1.18 0.68 3.79 1.10
Au3 g/t n/a n/a n/a n/a n/a
Au4 g/t n/a n/a n/a n/a n/a
Ag g/t 2.2 2.0 1.3 0.7 0.7
As ppm 90 180 320 60 40
Al % 7.12 6.56 8.04 7.48 7.72
Ba ppm 400 400 500 500 500
Be ppm 3.5 3.8 4.1 3.8 4.3
Bi ppm < 10 < 10 < 10 < 10 < 10Ctotal % 0.18 0.30 0.21 0.15 0.09
Corganic % < 0.03 < 0.03 < 0.03 < 0.03 < 0.03
CO32-
% 0.90 1.50 1.05 0.75 0.45
Ca ppm 5000 7000 5000 3000 3000
Cd ppm 10 < 5 < 5 < 5 < 5
Co ppm 20 25 60 15 20
Cr ppm 50 50 60 50 60
Cu ppm 486 642 680 820 842
CN Sol. Cu ppm 128 120 240 50 42
Fe % 4.80 5.10 5.72 5.94 6.28
Hg ppm < 0.1 < 0.1 < 0.1 < 0.1 < 0.1
K % 3.20 3.00 3.40 3.40 3.60
Li ppm 20 20 25 20 15
Mg % 1.44 1.48 1.52 1.20 1.24
Mn ppm 300 500 600 300 300
Mo ppm < 5 < 5 < 5 < 5 < 5
Na ppm 1040 1020 1060 920 1040
Ni ppm 40 40 45 35 30
P ppm 300 400 500 400 400
Pb ppm 1360 685 650 40 75Stotal % 1.34 1.50 1.34 1.70 1.92
Ssulfide % 1.32 1.50 1.34 1.52 1.86
Sb ppm 1.9 2.5 2.9 1.1 1.2SiO2 % 66.0 65.4 60.4 64.0 64.4
Sn ppm 50 < 50 < 50 50 < 50
Sr ppm 8 10 10 8 8
Te ppm 0.6 0.2 0.2 0.4 0.4
Th ppm 16 12 16 14 14
Ti ppm 3400 3400 3400 3400 3600
U ppm 3.2 3.1 3.4 3.3 3.4
V ppm 86 84 94 86 88
Y ppm 26 22 26 26 24
Zn ppm 2966 1886 1368 176 342
Zr ppm 155 155 140 150 145
True SG g/mL 2.7745 2.8198 2.7987 2.8385 2.8066
COMPOSITE #36
COMPOSITE #37
COMPOSITE #38
COMPOSITE #39
COMPOSITE #40
ANALYTE UNIT
Au1 g/t 1.90 1.18 0.64 2.25 3.78
Au2 g/t 1.97 1.27 0.64 2.10 3.77
Au3 g/t n/a n/a n/a 1.94 n/a
Au4 g/t n/a n/a n/a 2.09 n/a
Ag g/t 0.6 0.7 < 0.3 1.4 2.0
As ppm 20 20 10 60 30
Al % 7.72 7.36 8.28 6.96 8.32
Ba ppm 500 500 600 600 600
Be ppm 3.7 4.4 4.9 5.6 4.2
Bi ppm < 10 < 10 < 10 < 10 < 10Ctotal % 0.06 0.09 0.12 0.12 0.09
Corganic % < 0.03 < 0.03 < 0.03 < 0.03 < 0.03
CO32-
% 0.30 0.45 0.60 0.60 0.45
Ca ppm 2000 3000 3000 3000 3000
Cd ppm < 5 < 5 < 5 < 5 < 5
Co ppm 20 20 15 15 25
Cr ppm 50 50 40 20 50
Cu ppm 492 498 370 652 1088
CN Sol. Cu ppm 204 74 104 86 166
Fe % 6.16 5.70 5.24 5.10 7.14
Hg ppm < 0.1 < 0.1 < 0.1 < 0.1 < 0.1
K % 3.60 3.40 4.00 3.80 3.80
Li ppm 20 30 20 15 20
Mg % 1.20 1.32 1.28 0.84 1.20
Mn ppm 300 300 300 300 400
Mo ppm < 5 < 5 < 5 < 5 < 5
Na ppm 920 980 1000 780 1120
Ni ppm 40 40 30 30 40
P ppm 400 300 400 300 400
Pb ppm 15 25 10 265 70Stotal % 1.82 1.48 1.10 2.04 2.50
Ssulfide % 1.70 1.40 1.00 1.84 2.38
Sb ppm 1.1 1.7 0.9 1.3 1.3SiO2 % 63.6 63.8 64.2 66.6 60.8
Sn ppm 50 50 100 50 50
Sr ppm 8 14 10 12 12
Te ppm 0.2 0.2 < 0.2 0.2 0.4
Th ppm 14 14 18 24 14
Ti ppm 3600 3600 2800 1600 3400
U ppm 3.3 3.3 4.5 5.7 3.4
V ppm 90 88 66 24 80
Y ppm 24 24 30 30 26
Zn ppm 76 84 124 814 434
Zr ppm 155 155 175 160 140
True SG g/mL 2.8388 2.7812 2.8219 2.7752 2.8815
COMPOSITE #41
COMPOSITE #42
COMPOSITE #45
COMPOSITE #43
COMPOSITE #44
ANALYTE UNIT
Au1 g/t 0.44 0.62 0.41 0.44 1.04
Au2 g/t 0.50 0.60 0.42 0.41 1.21
Au3 g/t n/a n/a n/a n/a 0.97
Au4 g/t n/a n/a n/a n/a 1.06
Ag g/t 0.5 0.5 1.6 0.6 1.0
As ppm < 10 20 630 < 10 20
Al % 8.48 8.84 8.32 8.68 8.00
Ba ppm 600 600 500 600 500
Be ppm 4.3 5.3 4.4 4.9 4.5
Bi ppm < 10 < 10 < 10 < 10 < 10Ctotal % 0.03 0.06 0.06 0.06 < 0.03
Corganic % < 0.03 < 0.03 < 0.03 < 0.03 < 0.03
CO32-
% 0.15 0.30 0.30 0.30 < 0.03
Ca ppm 3000 2000 2000 3000 2000
Cd ppm < 5 < 5 < 5 < 5 < 5
Co ppm 15 15 20 15 15
Cr ppm 50 60 50 50 50
Cu ppm 390 536 868 622 926
CN Sol. Cu ppm 58 156 150 80 48
Fe % 5.76 6.06 6.52 6.24 6.26
Hg ppm < 0.1 < 0.1 < 0.1 < 0.1 < 0.1
K % 4.20 4.20 3.60 4.20 3.80
Li ppm 20 20 20 20 15
Mg % 1.20 1.24 1.16 1.28 1.04
Mn ppm 300 300 400 300 200
Mo ppm < 5 < 5 < 5 < 5 < 5
Na ppm 960 980 1180 1060 720
Ni ppm 40 35 35 30 35
P ppm 400 400 500 500 400
Pb ppm 10 15 115 5 10Stotal % 1.28 1.20 1.58 1.30 2.04
Ssulfide % 1.20 1.08 1.44 1.20 1.82
Sb ppm 0.8 1.1 2.3 0.8 0.8SiO2 % 61.4 59.2 62.0 60.8 63.2
Sn ppm 50 100 < 50 < 50 100
Sr ppm 14 12 12 12 8
Te ppm < 0.2 < 0.2 0.2 0.2 0.2
Th ppm 16 16 16 18 16
Ti ppm 3400 3400 3200 3200 3400
U ppm 3.7 3.4 3.9 4.3 3.7
V ppm 66 82 78 76 74
Y ppm 26 26 26 28 26
Zn ppm 44 76 280 62 40
Zr ppm 160 140 155 140 160
True SG g/mL 2.7958 2.8343 2.8088 2.7878 2.8419
COMPOSITE #46
COMPOSITE #47
COMPOSITE #48
COMPOSITE #49
COMPOSITE #50
ANALYTE UNIT
Au1 g/t 0.62 0.62 0.98 0.29 0.13
Au2 g/t 0.64 0.67 0.84 0.26 0.11
Au3 g/t n/a n/a 0.98 n/a n/a
Au4 g/t n/a n/a 1.35 n/a n/a
Ag g/t 0.8 0.7 1.0 0.5 0.4
As ppm < 10 10 10 780 80
Al % 7.28 7.68 8.84 8.56 7.96
Ba ppm 500 600 600 600 500
Be ppm 4.8 4.4 5.1 4.5 4.5
Bi ppm < 10 < 10 < 10 < 10 < 10Ctotal % 0.03 < 0.03 < 0.03 < 0.03 0.09
Corganic % < 0.03 < 0.03 < 0.03 < 0.03 < 0.03
CO32-
% 0.15 < 0.03 < 0.03 < 0.03 0.45
Ca ppm 2000 3000 4000 3000 5000
Cd ppm < 5 < 5 < 5 < 5 < 5
Co ppm 10 15 20 20 20
Cr ppm 30 50 50 50 50
Cu ppm 784 614 808 310 358
CN Sol. Cu ppm 46 98 50 118 354
Fe % 5.02 4.74 6.12 5.60 5.30
Hg ppm < 0.1 < 0.1 < 0.1 < 0.1 < 0.1
K % 4.00 4.00 4.40 4.20 3.80
Li ppm 15 15 20 15 15
Mg % 0.92 1.00 1.16 1.12 1.04
Mn ppm 200 200 300 300 300
Mo ppm < 5 < 5 < 5 < 5 < 5
Na ppm 980 2580 2400 3420 3480
Ni ppm 30 35 40 40 35
P ppm 200 400 400 400 400
Pb ppm < 5 < 5 < 5 < 5 5Stotal % 1.48 0.94 1.30 0.94 0.98
Ssulfide % 1.32 0.82 1.24 0.90 0.88
Sb ppm 0.5 0.4 0.7 1.1 1.2SiO2 % 67.2 65.4 61.8 61.4 65.2
Sn ppm 50 < 50 50 < 50 100
Sr ppm 8 12 18 14 14
Te ppm 0.2 < 0.2 0.4 1.0 0.4
Th ppm 26 18 16 18 16
Ti ppm 2400 3000 3600 3600 3400
U ppm 6.3 4.6 3.8 3.7 3.7
V ppm 40 64 82 80 78
Y ppm 30 26 28 28 26
Zn ppm 24 26 30 24 40
Zr ppm 160 165 145 155 170
True SG g/mL 2.7583 2.7860 2.7790 2.8149 2.7832
COMPOSITE #51
COMPOSITE #52
COMPOSITE #53
COMPOSITE #54
COMPOSITE #55
VISTA GOLD CORPORATION
A13575 MT TODD PROJECT FEASABILITY STUDY
COMPREHENSIVE HEAD ANALYSIS: VARIABILITY COMPOSITES
ANALYTE UNIT
Au1 g/t 0.72 1.56 0.53 0.31 0.25
Au2 g/t 0.80 1.37 0.59 0.37 0.26
Au3 g/t n/a 1.36 n/a n/a n/a
Au4 g/t n/a 1.33 n/a n/a n/a
Ag g/t 0.3 0.4 < 0.3 0.5 0.4
As ppm 20 80 30 340 140
Al % 7.44 7.32 7.12 6.72 6.36
Ba ppm 600 600 600 500 400
Be ppm 4.9 4.7 4.7 4.5 4.0
Bi ppm < 10 10 < 10 < 10 < 10Ctotal % 0.12 0.09 0.12 0.12 0.18
Corganic % < 0.03 < 0.03 < 0.03 < 0.03 0.06
CO32-
% 0.60 0.45 0.60 0.60 0.60
Ca ppm 6000 5000 11000 7000 5000
Cd ppm < 5 < 5 < 5 < 5 < 5
Co ppm 20 20 25 20 20
Cr ppm 50 40 40 50 40
Cu ppm 216 328 200 150 136
CN Sol. Cu ppm 110 284 98 132 54
Fe % 5.94 5.30 5.40 5.02 4.96
Hg ppm < 0.1 < 0.1 < 0.1 < 0.1 < 0.1
K % 3.80 3.60 3.20 2.40 2.40
Li ppm 25 30 30 20 15
Mg % 1.28 1.12 1.36 1.28 1.24
Mn ppm 500 400 500 500 400
Mo ppm < 5 < 5 < 5 < 5 < 5
Na ppm 1660 1860 7460 9700 7620
Ni ppm 40 35 45 45 40
P ppm 400 400 500 400 400
Pb ppm 45 10 15 120 85Stotal % 0.72 0.72 0.24 0.34 0.36
Ssulfide % 0.62 0.64 0.20 0.32 0.30
Sb ppm 1.0 1.1 0.7 1.0 1.4SiO2 % 64.2 63.2 64.6 65.8 67.4
Sn ppm < 50 < 50 < 50 < 50 50
Sr ppm 26 22 78 36 30
Te ppm 0.2 0.2 < 0.2 < 0.2 < 0.2
Th ppm 14 16 16 14 14
Ti ppm 3600 3200 4000 4000 4000
U ppm 3.4 3.6 3.4 3.4 3.1
V ppm 88 74 100 100 98
Y ppm 26 26 26 24 24
Zn ppm 190 66 86 222 80
Zr ppm 155 170 180 185 190
True SG g/mL 2.8089 2.7702 2.7872 2.7425 2.7372
COMPOSITE #56
COMPOSITE #57
COMPOSITE #58
COMPOSITE #59
COMPOSITE #60
ANALYTE UNIT
Au1 g/t 0.51 0.58 0.69 0.50 0.53
Au2 g/t 0.51 0.54 0.64 0.56 0.59
Au3 g/t n/a n/a n/a n/a n/a
Au4 g/t n/a n/a n/a n/a n/a
Ag g/t 0.6 0.5 0.9 0.3 0.4
As ppm 110 150 90 30 30
Al % 7.00 6.48 7.24 6.96 6.28
Ba ppm 500 500 500 700 400
Be ppm 4.7 4.1 4.9 4.8 3.8
Bi ppm < 10 < 10 < 10 < 10 < 10Ctotal % 0.11 0.12 0.09 0.21 0.27
Corganic % 0.03 < 0.03 < 0.03 0.03 0.09
CO32-
% 0.40 0.60 0.45 0.90 0.90
Ca ppm 6000 3000 5000 18000 7000
Cd ppm < 5 < 5 < 5 < 5 < 5
Co ppm 20 20 20 30 20
Cr ppm 40 40 40 20 40
Cu ppm 154 238 342 130 178
CN Sol. Cu ppm 82 194 72 192 214
Fe % 5.50 4.96 5.80 6.80 4.90
Hg ppm < 0.1 < 0.1 < 0.1 < 0.1 < 0.1
K % 3.00 2.80 3.60 3.20 3.00
Li ppm 20 15 20 15 15
Mg % 1.48 1.16 1.28 1.52 1.08
Mn ppm 400 300 400 800 500
Mo ppm < 5 < 5 < 5 < 5 < 5
Na ppm 7240 2620 1740 6460 2480
Ni ppm 35 35 30 25 35
P ppm 500 400 400 1100 400
Pb ppm 355 190 150 20 145Stotal % 0.50 0.84 1.18 0.98 0.68
Ssulfide % 0.46 0.70 0.98 0.78 0.54
Sb ppm 1.2 1.6 1.2 0.8 1.4SiO2 % 63.4 68.0 65.0 60.4 67.0
Sn ppm 50 < 50 < 50 < 50 < 50
Sr ppm 38 14 22 102 18
Te ppm < 0.2 < 0.2 < 0.2 < 0.2 < 0.2
Th ppm 14 16 16 14 14
Ti ppm 3800 3200 3600 5800 3600
U ppm 3.4 4.0 3.6 3.4 3.0
V ppm 96 72 82 160 92
Y ppm 26 26 26 28 24
Zn ppm 680 478 270 134 342
Zr ppm 170 170 165 180 175
True SG g/mL 2.7906 2.7660 2.8152 2.7950 2.7989
COMPOSITE #61
COMPOSITE #62
COMPOSITE #63
COMPOSITE #64
COMPOSITE #65
ANALYTE UNIT
Au1 g/t 1.06 0.94 1.36 1.62 2.68
Au2 g/t 1.00 0.92 1.25 1.47 2.72
Au3 g/t n/a n/a 1.23 1.52 n/a
Au4 g/t n/a n/a 1.18 1.56 n/a
Ag g/t 0.6 0.3 0.6 0.6 0.5
As ppm 30 50 30 20 10
Al % 6.40 7.08 6.72 6.36 6.36
Ba ppm 400 400 500 400 400
Be ppm 4.1 3.7 3.7 4.5 3.7
Bi ppm < 10 < 10 < 10 < 10 10Ctotal % 0.21 0.12 0.12 0.12 0.09
Corganic % 0.03 < 0.03 < 0.03 < 0.03 < 0.03
CO32-
% 0.90 0.60 0.60 0.60 0.45
Ca ppm 5000 5500 4900 3900 4750
Cd ppm < 5 < 5 < 5 < 5 < 5
Co ppm 20 20 20 20 20
Cr ppm 40 40 40 40 30
Cu ppm 236 336 398 596 544
CN Sol. Cu ppm 244 86 110 118 234
Fe % 5.30 6.00 5.92 5.60 6.14
Hg ppm < 0.1 0.1 < 0.1 < 0.1 < 0.1
K % 2.80 2.60 2.80 2.40 2.60
Li ppm 15 15 20 15 15
Mg % 1.12 1.12 1.12 1.08 1.08
Mn ppm 500 500 600 500 500
Mo ppm < 5 < 5 < 5 < 5 < 5
Na ppm 980 860 400 260 480
Ni ppm 35 35 35 40 40
P ppm 400 400 400 400 400
Pb ppm 295 10 15 15 225Stotal % 0.98 1.12 1.10 1.42 1.82
Ssulfide % 0.78 0.98 0.90 1.10 1.32
Sb ppm 1.4 1.2 1.5 1.5 1.2SiO2 % 67.8 67.6 66.8 60.6 64.4
Sn ppm < 50 100 < 50 50 100
Sr ppm 12 14 14 10 14
Te ppm < 0.2 < 0.2 < 0.2 < 0.2 0.2
Th ppm 14 14 14 16 14
Ti ppm 3800 4000 4000 3400 3800
U ppm 3.1 3.1 3.1 3.2 3.3
V ppm 94 94 94 86 88
Y ppm 24 24 24 24 24
Zn ppm 304 52 58 62 90
Zr ppm 180 155 165 160 175
True SG g/mL 2.7699 2.8278 2.8132 2.7853 2.8340
COMPOSITE #66
COMPOSITE #67
COMPOSITE #68
COMPOSITE #69
COMPOSITE #70
ANALYTE UNIT
Au1 g/t 1.11 0.45 0.60 0.48 0.19
Au2 g/t 1.15 0.43 0.52 0.46 0.22
Au3 g/t n/a n/a n/a n/a n/a
Au4 g/t n/a n/a n/a n/a n/a
Ag g/t < 0.3 < 0.3 0.7 < 0.3 0.4
As ppm 80 20 120 20 40
Al % 6.20 6.16 6.36 6.88 7.44
Ba ppm 400 300 300 400 400
Be ppm 3.4 3.7 3.9 4.1 4.8
Bi ppm < 10 < 10 < 10 < 10 < 10Ctotal % 0.09 0.06 0.30 0.12 0.06
Corganic % < 0.03 < 0.03 0.06 < 0.03 < 0.03
CO32-
% 0.45 0.30 1.20 0.60 0.30
Ca ppm 3750 3100 9100 3300 2600
Cd ppm < 5 < 5 < 5 < 5 < 5
Co ppm 25 20 20 20 20
Cr ppm 40 40 40 40 40
Cu ppm 226 208 530 246 184
CN Sol. Cu ppm 48 40 204 94 72
Fe % 5.14 4.92 5.04 5.24 5.16
Hg ppm < 0.1 < 0.1 < 0.1 < 0.1 < 0.1
K % 2.20 2.20 2.20 2.40 2.60
Li ppm 15 15 15 20 20
Mg % 1.24 1.40 1.68 1.36 1.48
Mn ppm 400 400 600 500 500
Mo ppm < 5 < 5 < 5 < 5 < 5
Na ppm 4460 3300 1440 4620 4680
Ni ppm 40 35 40 35 35
P ppm 400 400 400 400 500
Pb ppm 10 20 150 45 595Stotal % 0.88 0.62 0.70 0.70 0.44
Ssulfide % 0.64 0.54 0.62 0.54 0.34
Sb ppm 1.0 0.8 2.4 1.2 1.4SiO2 % 67.2 67.4 67.2 71.4 70.0
Sn ppm < 50 < 50 350 50 50
Sr ppm 16 14 10 14 14
Te ppm < 0.2 < 0.2 < 0.2 < 0.2 < 0.2
Th ppm 12 12 12 12 14
Ti ppm 4000 4000 4000 4200 4200
U ppm 3.0 2.8 2.8 3.0 3.1
V ppm 102 100 92 92 98
Y ppm 22 22 22 22 24
Zn ppm 46 32 538 148 908
Zr ppm 180 175 160 165 170
True SG g/mL 2.7633 2.7837 2.7565 2.7932 2.7510
COMPOSITE #71
COMPOSITE #72
COMPOSITE #73
COMPOSITE #74
COMPOSITE #75
ANALYTE UNIT
Au1 g/t 0.48 0.44 0.38 0.13 0.47
Au2 g/t 0.43 0.40 0.42 0.13 0.58
Au3 g/t n/a n/a n/a n/a 0.50
Au4 g/t n/a n/a n/a n/a 0.46
Ag g/t 0.5 0.5 1.2 0.5 < 0.3
As ppm 70 80 40 40 60
Al % 8.08 6.84 7.88 7.16 7.48
Ba ppm 500 400 500 400 500
Be ppm 5.1 4.2 5.3 5.4 3.8
Bi ppm < 10 < 10 < 10 < 10 < 10Ctotal % 0.09 0.09 0.12 0.12 < 0.03
Corganic % < 0.03 < 0.03 < 0.03 < 0.03 < 0.03
CO32-
% 0.45 0.45 0.60 0.60 < 0.03
Ca ppm 2650 3750 4600 4450 1050
Cd ppm < 5 < 5 15 < 5 < 5
Co ppm 20 20 30 25 20
Cr ppm 40 40 40 40 50
Cu ppm 256 238 468 140 238
CN Sol. Cu ppm 84 86 172 74 204
Fe % 6.04 5.24 6.24 4.76 5.16
Hg ppm < 0.1 < 0.1 < 0.1 < 0.1 < 0.1
K % 3.20 2.20 2.80 2.40 2.60
Li ppm 20 15 20 20 20
Mg % 1.44 1.24 1.40 1.24 1.44
Mn ppm 400 500 600 500 300
Mo ppm < 5 < 5 < 5 < 5 < 5
Na ppm 3220 7520 5400 7680 3500
Ni ppm 40 40 30 35 35
P ppm 500 300 500 400 300
Pb ppm 605 445 1215 635 25Stotal % 0.94 0.74 1.00 0.36 0.82
Ssulfide % 0.80 0.50 0.84 0.26 0.72
Sb ppm 1.7 1.4 2.3 1.3 0.9SiO2 % 64.4 67.6 62.6 64.6 67.2
Sn ppm 100 < 50 150 < 50 100
Sr ppm 16 24 26 32 10
Te ppm < 0.2 < 0.2 < 0.2 < 0.2 0.4
Th ppm 18 14 16 14 14
Ti ppm 4000 3800 3400 3600 3800
U ppm 3.1 3.2 3.3 3.5 3.0
V ppm 94 90 82 86 92
Y ppm 26 24 24 22 24
Zn ppm 864 306 4148 1032 74
Zr ppm 180 170 140 150 160
True SG g/mL 2.8181 2.7528 2.8224 2.7418 2.8062
COMPOSITE #79
COMPOSITE #80
COMPOSITE #76
COMPOSITE #77
VISTA GOLD CORPORATION
A13575 MT TODD PROJECT FEASABILITY STUDY
COMPREHENSIVE HEAD ANALYSIS: VARIABILITY COMPOSITES
COMPOSITE #78
ANALYTE UNIT
Au1 g/t 0.61 0.38 0.18 0.54 0.54
Au2 g/t 0.61 0.34 0.19 0.49 0.48
Au3 g/t n/a n/a n/a n/a n/a
Au4 g/t n/a n/a n/a n/a n/a
Ag g/t < 0.3 < 0.3 < 0.3 0.4 0.4
As ppm 40 30 30 20 20
Al % 7.12 7.92 7.04 7.20 8.40
Ba ppm 400 400 400 400 500
Be ppm 4.1 5.0 5.0 4.4 5.8
Bi ppm < 10 10 < 10 < 10 < 10Ctotal % 0.03 0.06 0.03 0.09 0.06
Corganic % < 0.03 < 0.03 < 0.03 < 0.03 < 0.03
CO32-
% 0.15 0.30 0.15 0.45 0.30
Ca ppm 2000 550 600 2350 1600
Cd ppm < 5 < 5 < 5 < 5 < 5
Co ppm 20 25 25 20 20
Cr ppm 50 50 40 50 50
Cu ppm 230 162 148 304 258
CN Sol. Cu ppm 184 134 80 134 100
Fe % 5.24 5.38 4.58 5.24 5.70
Hg ppm < 0.1 < 0.1 < 0.1 < 0.1 < 0.1
K % 2.40 2.80 2.60 2.40 3.60
Li ppm 20 15 20 20 20
Mg % 1.28 1.28 1.20 1.24 1.36
Mn ppm 300 400 300 400 400
Mo ppm < 5 < 5 < 5 < 5 < 5
Na ppm 4760 800 1780 4420 820
Ni ppm 45 40 45 40 40
P ppm 400 300 200 500 500
Pb ppm 15 105 80 55 30Stotal % 0.82 0.78 0.70 0.86 1.04
Ssulfide % 0.70 0.68 0.62 0.74 0.90
Sb ppm 0.8 1.1 1.1 0.7 1.0SiO2 % 64.4 64.8 62.2 66.2 59.8
Sn ppm < 50 50 < 50 100 50
Sr ppm 16 6 8 12 10
Te ppm 0.6 0.6 0.2 0.2 0.2
Th ppm 14 16 16 14 16
Ti ppm 3800 3800 3400 3800 3400
U ppm 3.1 3.2 3.6 3.2 3.5
V ppm 98 98 80 92 88
Y ppm 22 24 24 22 26
Zn ppm 72 192 276 200 128
Zr ppm 170 160 185 170 150
True SG g/mL 2.7570 2.8207 2.7533 2.7975 2.7915
COMPOSITE #81
COMPOSITE #82
COMPOSITE #83
COMPOSITE #84
COMPOSITE #85
ANALYTE UNIT
Au1 g/t 1.26 0.85 1.25 0.53 0.38
Au2 g/t 1.44 0.67 1.21 0.40 0.38
Au3 g/t n/a n/a n/a n/a n/a
Au4 g/t n/a n/a n/a n/a n/a
Ag g/t 0.4 0.6 0.5 0.7 < 0.3
As ppm 10 20 130 20 40
Al % 8.76 6.80 6.32 7.12 7.40
Ba ppm 500 400 400 500 400
Be ppm 4.5 3.3 3.3 3.6 3.8
Bi ppm < 10 < 10 < 10 < 10 < 10Ctotal % 0.06 0.03 0.06 0.06 0.03
Corganic % < 0.03 < 0.03 < 0.03 < 0.03 < 0.03
CO32-
% 0.30 0.15 0.30 0.30 0.15
Ca ppm 600 900 950 1000 1150
Cd ppm < 5 < 5 < 5 < 5 < 5
Co ppm 20 20 20 20 20
Cr ppm 50 40 40 50 50
Cu ppm 460 824 516 934 176
CN Sol. Cu ppm 76 140 124 304 118
Fe % 6.22 6.42 5.40 5.76 5.30
Hg ppm < 0.1 < 0.1 < 0.1 < 0.1 < 0.1
K % 3.40 2.40 2.20 2.60 2.40
Li ppm 20 15 15 15 20
Mg % 1.40 1.12 1.12 1.20 1.40
Mn ppm 300 300 300 300 300
Mo ppm < 5 < 5 < 5 < 5 < 5
Na ppm 720 440 640 460 4440
Ni ppm 35 40 35 35 40
P ppm 400 400 400 400 400
Pb ppm 15 10 15 60 20Stotal % 1.30 2.10 1.42 1.60 0.78
Ssulfide % 1.10 1.60 1.24 1.40 0.70
Sb ppm 0.8 0.8 0.7 0.9 0.9SiO2 % 63.8 65.6 64.0 67.4 67.4
Sn ppm 150 50 50 100 50
Sr ppm 4 4 4 6 10
Te ppm 0.4 0.4 0.6 0.4 0.2
Th ppm 16 12 12 12 12
Ti ppm 3600 3800 3600 3600 3800
U ppm 3.3 3.0 2.9 2.9 3.1
V ppm 90 92 86 86 96
Y ppm 26 24 22 24 24
Zn ppm 34 40 32 252 48
Zr ppm 145 175 180 150 170
True SG g/mL 2.8331 2.7928 2.8119 2.3727 2.7863
COMPOSITE #86
COMPOSITE #87
COMPOSITE #88
COMPOSITE #89
COMPOSITE #90
ANALYTE UNIT
Au1 g/t 0.64 0.42 0.19 0.30 0.60
Au2 g/t 0.62 0.41 0.18 0.29 0.59
Au3 g/t 0.63 0.45 n/a 0.33 n/a
Au4 g/t 0.61 0.43 n/a 0.30 n/a
Ag g/t 0.3 0.5 < 0.3 0.4 0.7
As ppm 20 50 30 20 20
Al % 8.08 7.44 7.12 8.16 8.28
Ba ppm 600 400 400 400 500
Be ppm 5.0 4.6 4.5 5.1 5.9
Bi ppm < 10 < 10 < 10 < 10 < 10Ctotal % < 0.03 0.03 0.03 0.09 0.06
Corganic % < 0.03 < 0.03 < 0.03 < 0.03 < 0.03
CO32-
% < 0.03 0.15 0.15 0.45 0.30
Ca ppm 1050 1350 2150 900 650
Cd ppm < 5 < 5 < 5 < 5 < 5
Co ppm 20 20 20 20 20
Cr ppm 50 40 50 50 50
Cu ppm 220 222 144 210 532
CN Sol. Cu ppm 152 124 54 86 186
Fe % 5.28 5.12 5.02 5.58 6.28
Hg ppm < 0.1 < 0.1 < 0.1 < 0.1 < 0.1
K % 2.80 2.80 2.40 3.20 3.20
Li ppm 20 20 20 20 20
Mg % 1.28 1.28 1.28 1.28 1.28
Mn ppm 300 400 400 400 300
Mo ppm < 5 < 5 < 5 < 5 < 5
Na ppm 3600 1660 4080 1620 680
Ni ppm 35 35 40 35 40
P ppm 400 200 500 400 400
Pb ppm 10 85 25 65 105Stotal % 0.82 0.82 0.70 0.84 1.82
Ssulfide % 0.74 0.80 0.60 0.76 1.44
Sb ppm 0.9 0.9 0.8 0.9 1.0SiO2 % 63.6 67.4 66.2 63.0 59.8
Sn ppm < 50 50 < 50 50 50
Sr ppm 8 10 14 8 6
Te ppm 0.4 0.4 0.4 0.2 0.2
Th ppm 16 14 12 14 14
Ti ppm 3400 3600 3800 3600 3400
U ppm 3.6 3.2 3.1 3.2 3.4
V ppm 82 78 90 88 88
Y ppm 26 26 24 24 26
Zn ppm 60 286 54 320 348
Zr ppm 175 165 165 155 140
True SG g/mL 2.8023 2.7635 2.7857 2.7853 2.8451
COMPOSITE #95
COMPOSITE #91
COMPOSITE #92
COMPOSITE #93
COMPOSITE #94
ANALYTE UNIT
Au1 g/t 0.67 0.73 0.81 0.33
Au2 g/t 0.58 0.56 0.66 0.38
Au3 g/t n/a 0.43 1.04 n/a
Au4 g/t n/a 0.47 0.76 n/a
Ag g/t 0.4 0.5 1.0 0.3
As ppm 20 40 30 10
Al % 6.88 6.72 7.56 6.76
Ba ppm 500 500 500 500
Be ppm 3.4 3.7 4.4 4.0
Bi ppm < 10 < 10 < 10 < 10Ctotal % 0.06 0.06 0.09 < 0.03
Corganic % < 0.03 < 0.03 < 0.03 < 0.03
CO32-
% 0.30 0.30 0.45 < 0.03
Ca ppm 1100 1100 950 950
Cd ppm < 5 < 5 < 5 < 5
Co ppm 15 20 25 20
Cr ppm 50 40 50 50
Cu ppm 274 702 738 536
CN Sol. Cu ppm 68 174 212 112
Fe % 5.32 5.62 7.06 5.56
Hg ppm < 0.1 < 0.1 < 0.1 < 0.1
K % 2.60 2.40 2.80 2.40
Li ppm 15 15 15 15
Mg % 1.20 1.16 1.28 1.16
Mn ppm 300 300 300 200
Mo ppm < 5 < 5 < 5 < 5
Na ppm 800 740 600 900
Ni ppm 30 35 40 40
P ppm 300 400 500 400
Pb ppm 10 30 60 10Stotal % 1.06 1.34 2.58 1.48
Ssulfide % 0.88 1.12 2.20 1.24
Sb ppm 0.6 0.7 1.4 0.8SiO2 % 65.8 68.6 63.8 67.0
Sn ppm 50 100 50 50
Sr ppm 6 6 4 6
Te ppm 0.2 0.4 0.6 < 0.2
Th ppm 14 12 14 12
Ti ppm 3800 3800 3600 3600
U ppm 2.8 3.0 3.1 3.0
V ppm 84 88 86 84
Y ppm 22 24 24 26
Zn ppm 42 50 210 24
Zr ppm 165 170 155 175
True SG g/mL 2.7788 2.7512 2.8521 2.7739
COMPOSITE #96
COMPOSITE #97
COMPOSITE #98
COMPOSITE #99
Report No. A13575 Part 1
APPENDIX XIV
Variability Composites (99 Samples)
Carbon Leach Testwork
Details and Results
PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH 4167
MT TODD VARIABILITY COMPOSITE # 1GRIND P80 : 125 µmWATER PERTH TAP WATERDATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 9.1 8.3
0 63.1 1.00 1.20 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 56.8 0.00 0.00 8.6 9.9 0.033 0.010 3.6 6.31 11 18 63.99 1.98
2 50.1 0.64 0.00 8.2 9.9 0.018 0.003 3.9 6.68 12 24 67.73 2.18
4 42.5 0.00 0.00 7.5 10.1 0.045 0.003 4.6 7.55 12 26 67.73 2.57
6 36.6 0.00 0.00 7.5 10.0 0.030 0.003 5.3 5.96 12 28 67.73 2.91
8 32.2 0.50 0.00 7.4 10.1 0.025 0.003 6.5 4.35 12 32 67.73 3.50
12 27.6 0.00 0.00 8.6 10.3 0.040 0.003 7.6 4.63 12 36 67.73 4.10
24 22.0 0.60 0.00 8.7 10.2 0.020 0.003 11.1 5.64 12 58 67.73 5.90
36 18.5 0.00 0.00 8.6 10.5 0.033 0.003 15.4 3.46 12 62 67.73 7.98
48 18.5 0.00 0.00 8.6 10.2 0.015 0.003 19.6 12 104 67.73 10.18
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (g) (%) (ppm) (g) (%) 1. NaCN Addition : 0.91 (Kg/t)
2. NaCN Consumption : 0.79 (Kg/t)
3000.0 0.12 360 32.27 125.0 375000 89.82 3. Lime Consumption : 0.40 (Kg/t)
2000.0 0.003 5 0.45 19.600 39200 9.39 4. Perth Tap Water Used : 1.000 (SG)
44.6 529 47.38 1371 0.33 5. Water weight to leach: 2000.0 (g)
18.5 12.0 222 19.90 104.0 1924 0.46 6. Grind Size P 80 : 125 (µm)
7. 0.0 g carbon was added to the slurry at the
67.73 10.18 start of cyanidation.
Total 1116 100.00 417495 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 0.37 139 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 0.42 / 0.43 108
* Carbon samples removed at each sampling interval.
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH 41678
MT TODD VARIABILITY COMPOSITE # 2GRIND P80 : 125 µmWATER PERTH TAP WATERDATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 9.1 8.2
0 63.1 1.00 1.20 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 56.4 0.50 0.00 8.7 10.0 0.025 0.050 14.9 6.67 9 36 62.29 5.13
2 49.3 0.00 0.00 9.2 10.0 0.035 0.003 17.7 7.13 12 40 69.21 6.02
4 37.7 0.50 0.00 7.5 10.1 0.025 0.003 20.0 11.54 12 40 69.21 6.76
6 32.2 0.00 0.00 7.7 10.1 0.033 0.003 21.4 5.57 12 40 69.21 7.21
8 27.1 0.70 0.00 7.9 10.3 0.015 0.003 22.6 5.04 12 50 69.21 7.64
12 22.5 0.00 0.00 8.7 10.5 0.045 0.003 23.2 4.63 12 96 69.21 8.04
24 17.4 0.80 0.00 8.8 10.1 0.010 0.003 23.5 5.13 12 108 69.21 8.17
36 14.7 0.54 0.00 8.5 10.3 0.023 0.003 26.8 2.65 12 118 69.21 9.26
48 14.7 0.00 0.00 8.7 9.9 0.005 0.003 24.0 12 306 69.21 8.81
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (g) (%) (ppm) (g) (%) 1. NaCN Addition : 1.35 (Kg/t)
2. NaCN Consumption : 1.28 (Kg/t)
3000.0 0.11 330 30.79 190.0 570000 91.19 3. Lime Consumption : 0.40 (Kg/t)
2000.0 0.003 5 0.47 24.000 48000 7.68 4. Perth Tap Water Used : 1.000 (SG)
48.4 560 52.27 2533 0.41 5. Water weight to leach: 2000.0 (g)
14.7 12.0 177 16.48 306.0 4504 0.72 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
69.21 8.81 start of cyanidation.
Total 1072 100.00 625037 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 0.36 208 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 0.43 / 0.42 168
* Carbon samples removed at each sampling interval.
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH 4169
MT TODD VARIABILITY COMPOSITE # 3GRIND P80 : 125 µmWATER PERTH TAP WATERDATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 9.3 11.0
0 63.1 1.00 1.21 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 56.4 0.00 0.00 8.7 10.1 0.030 0.020 6.3 6.71 30 30 60.98 1.22
2 49.3 0.60 0.00 7.7 10.0 0.018 0.015 8.6 7.10 33 58 66.00 1.72
4 41.6 0.00 0.00 7.6 10.1 0.045 0.014 10.9 7.66 36 68 70.60 2.15
6 36.1 0.60 0.00 7.5 10.2 0.023 0.003 13.3 5.47 38 76 72.50 2.58
8 31.2 0.00 0.00 7.6 10.3 0.040 0.003 15.6 4.96 39 82 73.64 2.98
12 27.0 0.00 0.00 8.7 10.3 0.028 0.003 20.9 4.17 40 98 74.63 3.91
24 23.3 0.84 0.00 8.8 9.9 0.008 0.003 28.1 3.69 42 140 76.33 5.22
36 20.7 0.70 0.00 9.1 10.2 0.013 0.003 44.1 2.67 42 200 76.33 8.02
48 20.7 0.00 0.00 8.7 10.3 0.013 0.003 58.6 42 268 76.33 10.58
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (g) (%) (ppm) (g) (%) 1. NaCN Addition : 1.25 (Kg/t)
2. NaCN Consumption : 1.14 (Kg/t)
3000.0 0.25 750 23.67 355.0 1065000 89.42 3. Lime Consumption : 0.40 (Kg/t)
2000.0 0.003 5 0.16 58.600 117200 9.84 4. Perth Tap Water Used : 1.000 (SG)
42.4 1547 48.81 3214 0.27 5. Water weight to leach: 2000.0 (g)
20.7 42.0 867 27.37 268.0 5534 0.46 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
76.33 10.58 start of cyanidation.
Total 3169 100.00 1190949 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 1.06 397 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 1.29 / 1.20 346
* Carbon samples removed at each sampling interval.
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH 4170
MT TODD VARIABILITY COMPOSITE # 4GRIND P80 : 125 µmWATER PERTH TAP WATERDATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 9.8 8.0
0 63.1 1.00 1.25 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 56.4 0.00 0.00 8.7 10.1 0.030 0.065 6.3 6.67 63 28 68.22 1.11
2 50.0 0.64 0.00 7.6 10.0 0.018 0.020 8.4 6.41 72 52 75.16 1.51
4 41.3 0.00 0.00 8.0 10.1 0.045 0.010 10.6 8.72 75 58 77.32 1.87
6 35.2 0.54 0.00 7.5 10.2 0.023 0.005 13.9 6.04 77 58 78.53 2.38
8 30.2 0.00 0.00 7.4 10.3 0.040 0.005 16.5 5.06 78 60 79.11 2.79
12 26.3 0.00 0.00 8.7 10.3 0.028 0.003 22.2 3.89 81 60 80.53 3.66
24 22.6 0.84 0.00 8.9 9.9 0.008 0.003 28.4 3.70 81 144 80.53 4.78
36 18.1 0.74 0.00 9.0 10.2 0.013 0.003 43.7 4.46 84 182 81.68 7.20
48 18.1 0.00 0.00 8.6 10.3 0.013 0.002 55.6 87 212 82.55 9.06
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (g) (%) (ppm) (g) (%) 1. NaCN Addition : 1.25 (Kg/t)
2. NaCN Consumption : 1.15 (Kg/t)
3000.0 0.35 1050 17.45 395.0 1185000 90.94 3. Lime Consumption : 0.42 (Kg/t)
2000.0 0.002 4 0.07 55.600 111200 8.53 4. Perth Tap Water Used : 1.000 (SG)
45.0 3385 56.26 3071 0.24 5. Water weight to leach: 2000.0 (g)
18.1 87.0 1577 26.22 212.0 3844 0.29 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
82.55 9.06 start of cyanidation.
Total 6016 100.00 1303114 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 2.01 434 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 2.16 / 2.28 414
* Carbon samples removed at each sampling interval.
Final Carbon (g)
Total Extraction
GOLD COPPER COMMENTS :
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
GOLD & COPPER EXTRACTION CALCULATIONS
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH 4171
MT TODD VARIABILITY COMPOSITE # 5GRIND P80 : 125 µmWATER PERTH TAP WATERDATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 9.4 8.1
0 63.1 1.00 1.07 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 55.5 0.00 0.00 8.8 10.1 0.033 0.020 5.9 7.54 42 40 65.64 0.66
2 49.0 0.64 0.00 7.5 10.1 0.018 0.015 8.3 6.54 48 70 73.53 0.94
4 38.5 0.00 0.00 7.7 10.2 0.045 0.003 10.5 10.54 50 70 75.31 1.14
6 32.6 0.54 0.00 7.6 10.3 0.023 0.003 13.5 5.86 51 70 76.25 1.42
8 27.6 0.00 0.00 7.4 10.4 0.045 0.003 16.4 4.98 53 100 77.84 1.73
12 23.4 0.00 0.00 8.7 10.5 0.030 0.003 21.3 4.20 54 108 78.52 2.19
24 18.6 0.90 0.00 8.8 9.9 0.005 0.003 28.1 4.79 57 304 80.23 3.03
36 15.2 0.70 0.00 9.2 10.3 0.015 0.003 46.3 3.40 57 332 80.23 4.73
48 15.2 0.00 0.00 8.7 10.3 0.010 0.003 61.4 57 378 80.23 6.15
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (g) (%) (ppm) (g) (%) 1. NaCN Addition : 1.26 (Kg/t)
2. NaCN Consumption : 1.17 (Kg/t)
3000.0 0.27 810 19.77 680.0 2040000 93.85 3. Lime Consumption : 0.36 (Kg/t)
2000.0 0.003 5 0.12 61.400 122800 5.65 4. Perth Tap Water Used : 1.000 (SG)
47.9 2414 58.92 5142 0.24 5. Water weight to leach: 2000.0 (g)
15.2 57.0 868 21.19 378.0 5757 0.26 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
80.23 6.15 start of cyanidation.
Total 4097 100.00 2173699 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 1.37 725 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 1.53 / 1.47 656
* Carbon samples removed at each sampling interval.
Final Carbon (g)
Total Extraction
GOLD COPPER COMMENTS :
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
GOLD & COPPER EXTRACTION CALCULATIONS
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH 4172
MT TODD VARIABILITY COMPOSITE # 6GRIND P80 : 125 µmWATER PERTH TAP WATERDATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 9.5 8.1
0 63.1 1.00 1.12 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 55.0 0.00 0.00 8.8 10.1 0.028 0.030 5.3 8.10 45 38 71.24 0.87
2 46.7 0.70 0.00 7.4 10.0 0.015 0.010 7.1 8.24 48 50 74.31 1.14
4 39.0 0.00 0.00 7.7 10.2 0.048 0.003 8.3 7.79 51 62 77.39 1.34
6 31.5 0.00 0.00 7.6 10.2 0.038 0.003 9.4 7.41 51 64 77.39 1.50
8 25.5 0.00 0.00 7.4 10.3 0.028 0.003 10.8 6.09 51 64 77.42 1.68
12 22.3 0.70 0.00 8.4 10.4 0.015 0.003 12.0 3.20 51 68 77.39 1.85
24 17.1 0.00 0.00 8.7 10.5 0.028 0.003 15.5 5.19 54 86 79.03 2.35
36 14.4 0.70 0.00 9.1 10.3 0.015 0.003 19.7 2.68 54 90 79.03 2.92
48 14.4 0.00 0.00 8.7 10.5 0.030 0.003 27.1 57 118 80.09 3.95
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (g) (%) (ppm) (g) (%) 1. NaCN Addition : 1.03 (Kg/t)
2. NaCN Consumption : 0.85 (Kg/t)
3000.0 0.27 810 19.91 475.0 1425000 96.05 3. Lime Consumption : 0.37 (Kg/t)
2000.0 0.003 5 0.12 27.100 54200 3.65 4. Perth Tap Water Used : 1.000 (SG)
48.7 2434 59.82 2664 0.18 5. Water weight to leach: 2000.0 (g)
14.4 57.0 820 20.15 118.0 1697 0.11 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
80.09 3.95 start of cyanidation.
Total 4069 100.00 1483561 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 1.36 495 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 1.62 / 1.58 454
* Carbon samples removed at each sampling interval.
Final Carbon (g)
Total Extraction
GOLD COPPER COMMENTS :
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
GOLD & COPPER EXTRACTION CALCULATIONS
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH 4173
MT TODD VARIABILITY COMPOSITE # 7GRIND P80 : 125 µmWATER PERTH TAP WATERDATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 9.5 8.0
0 63.1 1.00 1.25 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 56.4 0.00 0.00 8.7 10.1 0.033 0.040 6.5 6.71 45 56 64.12 0.90
2 46.2 0.54 0.00 7.4 10.0 0.023 0.010 10.1 10.21 51 70 70.24 1.31
4 38.9 0.00 0.00 7.7 10.2 0.040 0.005 12.5 7.28 54 90 73.06 1.62
6 34.3 0.00 0.00 7.5 10.1 0.028 0.003 15.6 4.61 57 106 75.51 1.99
8 26.5 0.60 0.00 7.3 10.2 0.020 0.003 18.0 7.78 57 124 75.51 2.28
12 23.2 0.00 0.00 8.6 10.5 0.030 0.003 24.4 3.33 58 126 76.12 2.97
24 19.9 0.80 0.00 8.7 10.4 0.010 0.003 28.7 3.25 60 226 77.11 3.57
36 17.2 0.64 0.00 9.1 10.4 0.018 0.003 43.6 2.68 60 240 77.11 5.19
48 17.2 0.00 0.00 8.6 10.1 0.008 0.003 52.9 63 698 78.25 6.63
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (g) (%) (ppm) (g) (%) 1. NaCN Addition : 1.19 (Kg/t)
2. NaCN Consumption : 1.11 (Kg/t)
3000.0 0.33 990 21.75 575.0 1725000 93.37 3. Lime Consumption : 0.42 (Kg/t)
2000.0 0.003 5 0.11 52.900 105800 5.73 4. Perth Tap Water Used : 1.000 (SG)
45.9 2471 54.29 4621 0.25 5. Water weight to leach: 2000.0 (g)
17.2 63.0 1085 23.85 698.0 12027 0.65 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
78.25 6.63 start of cyanidation.
Total 4551 100.00 1847447 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 1.52 616 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 1.76 / 1.83 570
* Carbon samples removed at each sampling interval.
Final Carbon (g)
Total Extraction
GOLD COPPER COMMENTS :
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
GOLD & COPPER EXTRACTION CALCULATIONS
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH 4174
MT TODD VARIABILITY COMPOSITE # 8GRIND P80 : 125 µmWATER PERTH TAP WATERDATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 8.9 8.1
0 63.1 1.00 1.27 11.1 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 54.1 0.00 0.00 8.7 10.2 0.030 0.025 8.0 8.96 51 58 62.82 0.94
2 44.4 0.60 0.00 7.6 10.1 0.020 0.085 11.2 9.77 57 92 71.37 1.31
4 35.2 0.00 0.00 7.9 10.2 0.040 0.005 12.9 9.15 61 110 71.71 1.51
6 29.5 0.54 0.00 7.7 10.0 0.023 0.005 16.2 5.72 62 134 72.38 1.86
8 24.3 0.00 0.00 7.4 10.2 0.043 0.003 18.3 5.19 63 136 72.85 2.06
12 20.3 0.54 0.00 8.6 10.5 0.023 0.003 23.6 3.98 66 148 74.25 2.58
24 16.0 0.54 0.00 8.8 10.4 0.023 0.003 32.8 4.31 69 194 75.43 3.51
36 13.0 0.54 0.00 9.3 10.6 0.023 0.003 47.2 3.05 72 226 76.35 4.90
48 13.0 0.00 0.00 8.8 10.3 0.015 0.003 61.1 72 346 76.35 6.30
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (g) (%) (ppm) (g) (%) 1. NaCN Addition : 1.25 (Kg/t)
2. NaCN Consumption : 1.14 (Kg/t)
3000.0 0.41 1230 23.65 655.0 1965000 93.70 3. Lime Consumption : 0.42 (Kg/t)
2000.0 0.003 5 0.10 61.100 122200 5.83 4. Perth Tap Water Used : 1.000 (SG)
50.1 3033 58.32 5492 0.26 5. Water weight to leach: 2000.0 (g)
13.0 72.0 932 17.93 346.0 4481 0.21 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
76.35 6.30 start of cyanidation.
Total 5201 100.00 2097173 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 1.73 699 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 1.89 / 2.04 698
* Carbon samples removed at each sampling interval.
Final Carbon (g)
Total Extraction
GOLD COPPER COMMENTS :
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
GOLD & COPPER EXTRACTION CALCULATIONS
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH 4175
MT TODD VARIABILITY COMPOSITE # 9GRIND P80 : 125 µmWATER PERTH TAP WATERDATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 9.8 8.0
0 63.1 1.00 1.21 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 57.5 0.00 0.00 8.5 10.1 0.028 0.025 5.7 5.59 33 50 67.53 1.01
2 51.1 0.60 0.00 7.5 10.0 0.020 0.005 7.8 6.39 36 56 71.73 1.30
4 42.7 0.00 0.00 7.7 10.2 0.040 0.003 9.2 8.36 39 56 76.42 1.49
6 37.9 0.50 0.00 7.6 10.1 0.025 0.003 10.7 4.80 39 66 76.42 1.73
8 31.7 0.00 0.00 7.5 10.4 0.043 0.003 12.5 6.23 39 84 76.42 2.02
12 27.7 0.64 0.00 9.0 10.4 0.025 0.003 16.1 4.02 39 88 76.42 2.53
24 23.2 0.90 0.00 8.9 10.1 0.013 0.003 21.2 4.48 39 122 76.42 3.30
36 18.1 0.80 0.00 9.5 10.3 0.020 0.003 31.8 5.14 39 206 76.42 4.89
48 18.1 0.00 0.00 8.7 10.4 0.013 0.003 38.1 42 304 78.14 5.88
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (g) (%) (ppm) (g) (%) 1. NaCN Addition : 1.48 (Kg/t)
2. NaCN Consumption : 1.37 (Kg/t)
3000.0 0.23 690 21.86 455.0 1365000 94.12 3. Lime Consumption : 0.40 (Kg/t)
2000.0 0.003 5 0.16 38.100 76200 5.25 4. Perth Tap Water Used : 1.000 (SG)
45.0 1703 53.94 3625 0.25 5. Water weight to leach: 2000.0 (g)
18.1 42.0 759 24.04 304.0 5493 0.38 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
78.14 5.88 start of cyanidation.
Total 3157 100.00 1450319 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 1.05 483 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 1.35 / 1.36 470
* Carbon samples removed at each sampling interval.
Final Carbon (g)
Total Extraction
GOLD COPPER COMMENTS :
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
GOLD & COPPER EXTRACTION CALCULATIONS
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH 4176
MT TODD VARIABILITY COMPOSITE # 10GRIND P80 : 125 µmWATER PERTH TAP WATERDATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 9.8 8.1
0 63.1 1.00 1.20 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 56.3 0.00 0.00 8.6 10.1 0.028 0.010 4.8 6.80 24 20 69.80 0.89
2 49.2 0.60 0.00 7.5 10.0 0.020 0.050 9.6 7.10 24 28 73.44 1.72
4 41.7 0.00 0.00 7.8 10.1 0.040 0.003 8.2 7.49 27 34 75.83 1.50
6 35.7 0.54 0.00 7.7 10.1 0.025 0.003 10.0 6.04 27 46 75.83 1.85
8 30.6 0.00 0.00 7.6 10.3 0.043 0.003 11.6 5.02 27 56 75.83 2.14
12 25.2 0.50 0.00 8.9 10.3 0.025 0.003 15.8 5.43 28 64 77.23 2.86
24 21.2 0.74 0.00 8.9 10.4 0.013 0.003 21.0 4.01 30 100 79.52 3.79
36 16.4 0.60 0.00 9.4 10.4 0.020 0.003 29.1 4.78 30 134 79.52 5.19
48 16.4 0.00 0.00 8.9 10.4 0.013 0.003 39.6 30 234 79.52 7.06
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (g) (%) (ppm) (g) (%) 1. NaCN Addition : 1.33 (Kg/t)
2. NaCN Consumption : 1.22 (Kg/t)
3000.0 0.15 450 20.48 375.0 1125000 92.94 3. Lime Consumption : 0.40 (Kg/t)
2000.0 0.003 5 0.23 39.600 79200 6.54 4. Perth Tap Water Used : 1.000 (SG)
46.7 1250 56.89 2401 0.20 5. Water weight to leach: 2000.0 (g)
16.4 30.0 492 22.40 234.0 3840 0.32 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
79.52 7.06 start of cyanidation.
Total 2197 100.00 1210441 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 0.73 403 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 0.91 / 0.87 384
* Carbon samples removed at each sampling interval.
Final Carbon (g)
Total Extraction
GOLD COPPER COMMENTS :
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
GOLD & COPPER EXTRACTION CALCULATIONS
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH 4177
MT TODD VARIABILITY COMPOSITE # 11GRIND P80 : 125 µmWATER PERTH TAP WATERDATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 9.6 8.1
0 63.1 1.00 1.20 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 56.8 0.00 0.00 8.5 10.2 0.030 0.015 5.2 6.25 21 34 71.20 1.01
2 49.5 0.50 0.00 7.5 10.1 0.025 0.005 7.0 7.35 23 42 76.12 1.33
4 43.7 0.00 0.00 7.7 10.2 0.038 0.003 8.2 5.82 24 50 78.46 1.55
6 37.5 0.00 0.00 7.7 10.1 0.028 0.003 9.4 6.12 24 60 78.46 1.78
8 31.1 0.60 0.00 7.3 10.3 0.020 0.003 10.5 6.42 24 74 78.46 2.00
12 27.0 0.00 0.00 8.5 10.5 0.035 0.005 12.6 4.10 24 78 78.72 2.35
24 21.6 0.74 0.00 8.8 10.5 0.013 0.003 15.2 5.46 24 98 78.46 2.81
36 16.6 0.00 0.00 9.3 10.2 0.035 0.003 20.1 4.96 24 100 78.46 3.60
48 16.6 0.00 0.00 8.7 10.4 0.015 0.003 24.0 27 176 81.08 4.34
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (g) (%) (ppm) (g) (%) 1. NaCN Addition : 0.95 (Kg/t)
2. NaCN Consumption : 0.83 (Kg/t)
3000.0 0.12 360 18.92 395.0 1185000 95.66 3. Lime Consumption : 0.40 (Kg/t)
2000.0 0.003 5 0.26 24.000 48000 3.87 4. Perth Tap Water Used : 1.000 (SG)
46.5 1089 57.26 2793 0.23 5. Water weight to leach: 2000.0 (g)
16.6 27.0 448 23.56 176.0 2922 0.24 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
81.08 4.34 start of cyanidation.
Total 1903 100.00 1238714 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 0.63 413 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 0.70 / 0.70 362
* Carbon samples removed at each sampling interval.
Final Carbon (g)
Total Extraction
GOLD COPPER COMMENTS :
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
GOLD & COPPER EXTRACTION CALCULATIONS
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH 4178
MT TODD VARIABILITY COMPOSITE # 12GRIND P80 : 125 µmWATER PERTH TAP WATERDATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 10.3 8.2
0 63.1 1.00 1.34 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 58.5 0.00 0.00 8.8 10.1 0.028 0.015 5.4 4.63 30 42 69.26 1.40
2 50.5 0.74 0.00 7.5 9.9 0.013 0.003 6.9 7.93 32 52 72.57 1.73
4 42.9 0.00 0.00 7.7 10.1 0.043 0.003 9.0 7.67 33 70 74.39 2.27
6 37.3 0.00 0.00 7.5 10.2 0.030 0.003 11.9 5.52 33 76 74.39 2.89
8 30.1 0.64 0.00 7.1 10.2 0.018 0.003 13.5 7.25 33 76 74.39 3.22
12 25.3 0.00 0.00 8.8 10.4 0.048 0.003 18.2 4.74 34 80 75.48 4.20
24 20.6 0.60 0.00 8.8 10.3 0.020 0.003 24.6 4.78 36 168 77.30 5.76
36 17.0 0.00 0.00 9.1 10.5 0.033 0.003 31.9 3.53 36 176 77.30 7.28
48 17.0 0.00 0.00 8.6 10.2 0.013 0.003 37.7 36 272 77.30 8.65
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (g) (%) (ppm) (g) (%) 1. NaCN Addition : 0.99 (Kg/t)
2. NaCN Consumption : 0.88 (Kg/t)
3000.0 0.21 630 22.70 295.0 885000 91.35 3. Lime Consumption : 0.45 (Kg/t)
2000.0 0.003 5 0.18 37.700 75400 7.78 4. Perth Tap Water Used : 1.000 (SG)
46.1 1528 55.03 3723 0.38 5. Water weight to leach: 2000.0 (g)
17.0 36.0 613 22.09 272.0 4632 0.48 6. Grind Size P 80 : 125 (µm)
7. 0.0 g carbon was added to the slurry at the
77.30 8.65 start of cyanidation.
Total 2776 100.00 968755 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 0.93 323 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 1.08 / 1.08 330
* Carbon samples removed at each sampling interval.
Final Carbon (g)
Total Extraction
GOLD COPPER COMMENTS :
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
GOLD & COPPER EXTRACTION CALCULATIONS
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH 4179
MT TODD VARIABILITY COMPOSITE # 13GRIND P80 : 125 µmWATER PERTH TAP WATERDATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 9.5 8.1
0 63.1 1.00 1.64 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 56.4 0.00 0.00 8.2 10.2 0.028 0.015 4.8 6.72 12 32 52.08 1.60
2 49.9 0.60 0.00 7.3 10.1 0.020 0.003 6.4 6.49 15 48 61.61 2.16
4 45.3 0.00 0.00 7.6 10.3 0.043 0.003 7.5 4.58 17 52 68.22 2.47
6 41.1 0.00 0.00 7.6 10.2 0.035 0.003 9.0 4.21 18 62 71.21 2.95
8 35.6 0.54 0.00 7.3 10.3 0.023 0.003 9.9 5.50 18 70 71.21 3.25
12 31.9 0.00 0.00 8.6 10.5 0.040 0.003 12.2 3.70 18 74 71.21 3.92
24 27.6 0.80 0.00 8.8 10.2 0.010 0.003 13.2 4.24 18 114 71.21 4.37
36 22.7 0.54 0.00 9.4 10.4 0.023 0.003 17.2 4.99 18 152 71.21 5.63
48 22.7 0.00 0.00 8.2 10.3 0.018 0.003 19.7 18 158 71.21 6.34
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (g) (%) (ppm) (g) (%) 1. NaCN Addition : 1.16 (Kg/t)
2. NaCN Consumption : 1.03 (Kg/t)
3000.0 0.15 435 28.79 225.0 675000 93.66 3. Lime Consumption : 0.55 (Kg/t)
2000.0 0.003 5 0.33 19.700 39400 5.47 4. Perth Tap Water Used : 1.000 (SG)
40.4 663 43.90 2711 0.38 5. Water weight to leach: 2000.0 (g)
22.7 18.0 408 26.98 158.0 3579 0.50 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
71.21 6.34 start of cyanidation.
Total 1511 100.00 720690 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 0.50 240 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 1.01 / 0.98 228
* Carbon samples removed at each sampling interval.
Final Carbon (g)
Total Extraction
GOLD COPPER COMMENTS :
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
GOLD & COPPER EXTRACTION CALCULATIONS
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH 4180
MT TODD VARIABILITY COMPOSITE # 14GRIND P80 : 125 µmWATER PERTH TAP WATERDATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 9.6 8.1
0 63.1 1.00 1.38 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 55.1 0.50 0.00 8.0 10.2 0.025 0.015 8.3 7.98 9 68 49.85 0.93
2 48.5 0.00 0.00 7.4 10.2 0.043 0.010 9.2 6.58 12 80 62.81 1.02
4 44.0 0.00 0.00 7.8 10.2 0.038 0.003 10.2 4.54 13 90 65.60 1.12
6 38.4 0.00 0.00 7.6 10.2 0.033 0.003 10.4 5.56 14 158 69.27 1.28
8 32.9 0.50 0.00 7.4 10.2 0.025 0.003 10.9 5.53 15 168 72.48 1.34
12 29.0 0.00 0.00 8.8 10.4 0.040 0.003 12.1 3.90 15 176 72.48 1.46
24 25.3 0.80 0.00 8.8 10.0 0.010 0.003 13.0 3.70 15 222 72.48 1.59
36 20.9 0.60 0.00 9.2 10.3 0.200 0.003 16.4 4.44 15 202 72.48 1.87
48 20.9 0.00 0.00 8.6 10.4 0.023 0.003 17.9 15 162 72.48 1.97
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (g) (%) (ppm) (g) (%) 1. NaCN Addition : 1.13 (Kg/t)
2. NaCN Consumption : 0.93 (Kg/t)
3000.0 0.11 330 27.52 735.0 2205000 98.03 3. Lime Consumption : 0.46 (Kg/t)
2000.0 0.003 5 0.42 17.900 35800 1.59 4. Perth Tap Water Used : 1.000 (SG)
42.2 551 45.97 5147 0.23 5. Water weight to leach: 2000.0 (g)
20.9 15.0 313 26.09 162.0 3378 0.15 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
72.48 1.97 start of cyanidation.
Total 1199 100.00 2249325 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 0.40 750 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 0.42 / 0.42 732
* Carbon samples removed at each sampling interval.
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH 4181
MT TODD VARIABILITY COMPOSITE # 15GRIND P80 : 125 µmWATER PERTH TAP WATERDATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 9.6 8.1
0 63.1 1.00 1.04 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 54.1 0.00 0.00 8.3 10.2 0.030 0.010 8.5 8.98 15 124 57.27 0.85
2 45.1 0.50 0.00 7.3 10.1 0.025 0.003 11.7 9.05 18 170 66.00 1.12
4 39.8 0.00 0.00 7.6 10.2 0.038 0.003 13.2 5.30 19 172 68.67 1.22
6 33.4 0.00 0.00 7.6 10.1 0.033 0.003 16.4 6.38 19 188 68.67 1.46
8 27.7 0.60 0.00 7.4 10.3 0.020 0.003 18.3 5.65 20 212 70.65 1.62
12 24.3 0.00 0.00 8.4 10.5 0.040 0.003 22.9 3.46 21 224 72.29 1.94
24 21.5 0.84 0.00 8.9 10.2 0.008 0.003 31.1 2.72 24 314 76.61 2.58
36 17.2 0.64 0.00 9.3 10.4 0.018 0.003 43.9 4.33 27 346 80.44 3.48
48 17.2 0.00 0.00 8.6 10.4 0.013 0.003 59.1 27 410 80.44 4.56
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (g) (%) (ppm) (g) (%) 1. NaCN Addition : 1.19 (Kg/t)
2. NaCN Consumption : 1.09 (Kg/t)
3000.0 0.11 330 19.56 930 2790000 95.44 3. Lime Consumption : 0.35 (Kg/t)
2000.0 0.003 5 0.30 59 118200 4.04 4. Perth Tap Water Used : 1.000 (SG)
45.9 887 52.60 7975 0.27 5. Water weight to leach: 2000.0 (g)
17.2 27.0 465 27.54 410 7056 0.24 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
80.44 4.56 start of cyanidation.
Total 1687 100.00 2923231 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 0.56 974 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 0.54 / 0.51 886
* Carbon samples removed at each sampling interval.
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH 4182
MT TODD VARIABILITY COMPOSITE # 16GRIND P80 : 125 µmWATER PERTH TAP WATERDATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 9.6 8.0
0 63.1 1.00 1.28 11.1 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 56.2 0.00 0.00 7.9 10.3 0.033 0.020 7.1 6.87 48 76 61.06 1.03
2 50.2 0.00 0.00 7.3 10.3 0.028 0.010 8.8 5.99 51 78 64.02 1.19
4 46.6 0.50 0.00 7.3 10.3 0.025 0.003 10.5 3.60 57 80 69.72 1.39
6 40.3 0.00 0.00 7.4 10.3 0.040 0.003 13.0 6.34 60 82 72.50 1.66
8 34.4 0.00 0.00 7.1 10.4 0.033 0.003 15.0 5.84 63 104 74.91 1.93
12 32.4 0.64 0.00 9.0 10.3 0.018 0.003 18.5 2.07 63 136 74.91 2.37
24 29.1 0.84 0.00 8.8 10.2 0.008 0.003 25.8 3.25 64 208 75.55 3.29
36 23.7 0.70 0.00 9.4 10.4 0.015 0.003 37.7 5.45 66 210 76.71 4.59
48 23.7 0.00 0.00 8.6 10.3 0.010 0.003 50.2 66 312 76.71 6.09
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (g) (%) (ppm) (g) (%) 1. NaCN Addition : 1.23 (Kg/t)
2. NaCN Consumption : 1.14 (Kg/t)
3000.0 0.39 1170 23.29 575 1725000 93.91 3. Lime Consumption : 0.43 (Kg/t)
2000.0 0.003 5 0.10 50 100400 5.47 4. Perth Tap Water Used : 1.000 (SG)
39.4 2287 45.52 3984 0.22 5. Water weight to leach: 2000.0 (g)
23.7 66.0 1562 31.09 312 7385 0.40 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
76.71 6.09 start of cyanidation.
Total 5024 100.00 1836770 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 1.67 612 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 1.79 / 1.93 592
* Carbon samples removed at each sampling interval.
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH 4183
MT TODD VARIABILITY COMPOSITE # 17GRIND P80 : 125 µmWATER PERTH TAP WATERDATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 9.7 8.0
0 63.1 1.00 1.25 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 57.1 0.00 0.00 8.5 10.2 0.030 0.015 7.1 6.03 36 32 62.89 0.95
2 50.1 0.60 0.00 7.4 10.2 0.020 0.005 9.8 6.93 39 58 67.02 1.35
4 45.0 0.00 0.00 7.7 10.1 0.040 0.003 12.0 5.13 42 58 71.00 1.61
6 37.7 0.50 0.00 7.6 10.1 0.025 0.003 15.2 7.29 45 66 74.69 2.00
8 31.9 0.00 0.00 7.3 10.4 0.043 0.003 18.2 5.80 48 92 77.78 2.41
12 29.1 0.00 0.00 8.8 10.3 0.030 0.003 24.7 2.82 51 122 80.39 3.24
24 22.7 0.90 0.00 8.8 10.1 0.005 0.003 33.3 6.42 54 252 82.78 4.47
36 17.0 0.64 0.00 9.2 10.5 0.018 0.003 55.6 5.69 54 326 82.78 7.19
48 17.0 0.00 0.00 8.2 10.5 0.015 0.003 79.2 54 360 82.78 10.00
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (g) (%) (ppm) (g) (%) 1. NaCN Addition : 1.21 (Kg/t)
2. NaCN Consumption : 1.10 (Kg/t)
3000.0 0.21 630 17.22 510 1530000 90.00 3. Lime Consumption : 0.42 (Kg/t)
2000.0 0.003 5 0.14 79 158400 9.32 4. Perth Tap Water Used : 1.000 (SG)
46.1 2107 57.59 5531 0.33 5. Water weight to leach: 2000.0 (g)
17.0 54.0 916 25.05 360 6109 0.36 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
82.78 10.00 start of cyanidation.
Total 3658 100.00 1700040 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 1.22 567 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 1.20 / 1.22 540
* Carbon samples removed at each sampling interval.
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH 4184
MT TODD VARIABILITY COMPOSITE # 18GRIND P80 : 125 µmWATER PERTH TAP WATERDATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 9.8 8.2
0 63.1 1.00 1.30 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 54.9 0.00 0.00 8.8 10.3 0.028 0.010 10.3 8.21 30 52 73.68 0.67
2 48.2 0.64 0.00 7.4 9.8 0.018 0.003 13.8 6.68 32 104 77.33 0.93
4 42.1 0.00 0.00 7.7 10.0 0.038 0.003 16.4 6.05 33 128 79.18 1.11
6 36.5 0.54 0.00 7.5 9.9 0.025 0.003 21.2 5.69 35 136 82.43 1.39
8 30.7 0.00 0.00 7.3 10.2 0.040 0.003 23.4 5.80 36 150 83.84 1.52
12 28.1 0.00 0.00 8.4 10.2 0.030 0.003 28.5 2.51 36 158 83.84 1.82
24 23.9 0.84 0.00 9.0 9.9 0.008 0.003 36.2 4.26 36 238 83.84 2.31
36 19.7 0.50 0.00 9.0 10.2 0.025 0.003 51.1 4.16 36 242 83.84 3.15
48 19.7 0.00 0.00 8.4 10.2 0.025 0.003 65.9 38 246 84.97 3.97
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (g) (%) (ppm) (g) (%) 1. NaCN Addition : 1.17 (Kg/t)
2. NaCN Consumption : 1.02 (Kg/t)
3000.0 0.13 390 15.03 1145 3435000 96.03 3. Lime Consumption : 0.43 (Kg/t)
2000.0 0.003 5 0.19 66 131800 3.68 4. Perth Tap Water Used : 1.000 (SG)
43.4 1461 56.29 5530 0.15 5. Water weight to leach: 2000.0 (g)
19.7 37.5 740 28.49 246 4851 0.14 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
84.97 3.97 start of cyanidation.
Total 2596 100.00 3577181 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 0.87 1192 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 0.93 / 1.16 1014
* Carbon samples removed at each sampling interval.
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH 4185
MT TODD VARIABILITY COMPOSITE # 19GRIND P80 : 125 µmWATER PERTH TAP WATERDATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 9.6 8.1
0 63.1 1.00 1.05 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 58.9 0.00 0.00 8.7 10.2 0.028 0.010 10.5 4.20 15 64 57.53 0.46
2 50.2 0.50 0.00 7.6 10.2 0.025 0.003 11.7 8.68 18 112 67.16 0.56
4 45.5 0.00 0.00 7.8 10.3 0.038 0.003 12.9 4.69 20 136 73.14 0.62
6 40.1 0.00 0.00 7.6 10.2 0.028 0.003 15.0 5.37 21 154 75.85 0.72
8 35.4 0.64 0.00 7.6 10.3 0.018 0.003 15.6 4.75 21 154 75.85 0.74
12 31.9 0.00 0.00 9.1 10.4 0.033 0.005 20.1 3.48 21 182 76.14 0.92
24 25.6 0.94 0.00 9.1 10.1 0.003 0.003 22.1 6.33 21 222 75.85 1.02
36 20.2 0.50 0.00 9.2 10.4 0.025 0.003 32.3 5.37 21 270 75.85 1.42
48 20.2 0.00 0.00 8.8 9.8 0.003 0.003 50.0 24 534 79.46 2.18
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (g) (%) (ppm) (g) (%) 1. NaCN Addition : 1.19 (Kg/t)
2. NaCN Consumption : 1.14 (Kg/t)
3000.0 0.12 345 20.54 1760 5280000 97.82 3. Lime Consumption : 0.35 (Kg/t)
2000.0 0.003 5 0.30 50 100000 1.85 4. Perth Tap Water Used : 1.000 (SG)
42.9 844 50.28 6657 0.12 5. Water weight to leach: 2000.0 (g)
20.2 24.0 485 28.88 534 10792 0.20 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
79.46 2.18 start of cyanidation.
Total 1679 100.00 5397449 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 0.56 1799 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 0.54 / 0.53 1546
* Carbon samples removed at each sampling interval.
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH 4WH 4186
MT TODD VARIABILITY COMPOSITE # 20GRIND P80 : 125 µmWATER PERTH TAP WATERDATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 9.7 8.1
0 63.1 1.00 1.38 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 60.2 0.00 0.00 8.5 10.3 0.025 0.030 13.2 2.92 36 98 56.49 0.88
2 53.3 0.74 0.00 7.6 10.3 0.013 0.010 16.1 6.85 40 116 61.36 1.06
4 48.1 0.00 0.00 7.8 10.3 0.050 0.010 19.7 5.21 44 120 66.52 1.26
6 43.0 0.00 0.00 7.7 10.4 0.045 0.003 23.3 5.07 48 162 70.82 1.51
8 36.6 0.00 0.00 7.2 10.5 0.035 0.005 26.9 6.44 51 166 74.07 1.71
12 32.9 0.00 0.00 8.9 10.6 0.028 0.003 32.0 3.70 53 194 75.73 2.01
24 27.3 0.84 0.00 8.9 10.1 0.008 0.003 36.9 5.59 57 236 78.91 2.31
36 22.4 0.00 0.00 9.2 10.1 0.033 0.003 58.3 4.93 57 328 78.91 3.53
48 22.4 0.00 0.00 8.6 10.5 0.015 0.003 66.3 57 442 78.91 4.03
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (g) (%) (ppm) (g) (%) 1. NaCN Addition : 0.86 (Kg/t)
2. NaCN Consumption : 0.74 (Kg/t)
3000.0 0.29 870 21.09 1185 3555000 95.97 3. Lime Consumption : 0.46 (Kg/t)
2000.0 0.003 5 0.12 66 132600 3.58 4. Perth Tap Water Used : 1.000 (SG)
40.7 1976 47.89 6964 0.19 5. Water weight to leach: 2000.0 (g)
22.4 57.0 1275 30.90 442 9888 0.27 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
78.91 4.03 start of cyanidation.
Total 4126 100.00 3704452 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 1.38 1235 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 1.32 / 1.32 1118
* Carbon samples removed at each sampling interval.
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH 4187
MT TODD VARIABILITY COMPOSITE # 21GRIND P80 : 125 µmWATER PERTH TAP WATERDATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 9.4 8.0
0 63.1 1.00 1.57 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 59.2 0.00 0.00 8.7 10.2 0.025 0.025 13.5 3.93 42 106 74.16 0.92
2 51.7 0.60 0.00 7.6 10.1 0.020 0.005 19.7 7.43 47 164 81.18 1.34
4 47.7 0.00 0.00 7.7 10.2 0.035 0.003 26.1 4.04 48 172 82.46 1.71
6 41.6 0.64 0.00 7.6 10.0 0.018 0.003 32.8 6.06 49 222 83.77 2.14
8 36.7 0.00 0.00 7.4 10.2 0.040 0.003 39.9 4.92 50 272 84.92 2.58
12 33.7 0.00 0.00 8.8 10.4 0.028 0.003 51.5 3.01 51 320 85.93 3.27
24 27.4 0.90 0.00 8.6 10.1 0.005 0.003 60.5 6.34 51 488 85.93 3.91
36 20.8 0.64 0.00 9.3 10.5 0.018 0.003 97.7 6.58 51 548 85.93 5.99
48 20.8 0.00 0.00 8.2 10.6 0.023 0.003 126.0 54 702 87.64 7.63
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (g) (%) (ppm) (g) (%) 1. NaCN Addition : 1.26 (Kg/t)
2. NaCN Consumption : 1.12 (Kg/t)
3000.0 0.15 450 12.36 1125 3375000 92.37 3. Lime Consumption : 0.52 (Kg/t)
2000.0 0.003 5 0.14 126 252000 6.90 4. Perth Tap Water Used : 1.000 (SG)
42.3 2064 56.69 12260 0.34 5. Water weight to leach: 2000.0 (g)
20.8 54.0 1122 30.81 702 14581 0.40 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
87.64 7.63 start of cyanidation.
Total 3640 100.00 3653840 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 1.21 1218 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 1.22 / 1.14 1100
* Carbon samples removed at each sampling interval.
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH WH 4188
MT TODD VARIABILITY COMPOSITE # 22GRIND P80 : 125 µmWATER PERTH TAP WATERDATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 3.9 8.1
0 63.1 1.00 1.51 11.1 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 58.4 0.00 0.00 6.9 10.4 0.025 0.020 6.5 4.66 18 80 46.78 1.09
2 50.8 0.60 0.00 7.2 10.3 0.020 0.010 11.3 7.59 24 138 59.93 1.86
4 45.3 0.00 0.00 7.3 10.4 0.048 0.005 14.9 5.52 29 164 69.65 2.38
6 40.4 0.00 0.00 7.5 10.3 0.040 0.003 19.8 4.92 30 180 71.25 3.02
8 35.7 0.00 0.00 7.1 10.3 0.038 0.003 23.8 4.66 31 182 72.86 3.51
12 32.5 0.54 0.00 9.0 10.2 0.023 0.003 30.6 3.19 33 230 75.70 4.44
24 27.5 0.84 0.00 9.0 10.1 0.016 0.003 43.3 5.01 36 314 79.59 6.14
36 21.0 0.54 0.00 9.2 10.4 0.023 0.003 60.2 6.53 36 348 79.59 8.25
48 21.0 0.00 0.00 8.5 10.3 0.018 0.003 73.7 39 364 82.09 9.91
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (g) (%) (ppm) (g) (%) 1. NaCN Addition : 1.17 (Kg/t)
2. NaCN Consumption : 1.04 (Kg/t)
3000.0 0.15 450 17.91 495 1485000 90.09 3. Lime Consumption : 0.50 (Kg/t)
2000.0 0.003 5 0.20 74 147400 8.94 4. Perth Tap Water Used : 1.000 (SG)
42.1 1239 49.30 8266 0.50 5. Water weight to leach: 2000.0 (g)
21.0 39.0 819 32.59 364 7644 0.46 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
82.09 9.91 start of cyanidation.
Total 2513 100.00 1648310 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 0.84 549 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 0.86 / 0.74 510
* Carbon samples removed at each sampling interval.
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH 4189
MT TODD VARIABILITY COMPOSITE # 23GRIND P80 : 125 µmWATER PERTH TAP WATERDATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 7.8 8.1
0 63.1 1.00 1.64 11.1 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 59.1 0.00 0.00 7.9 10.4 0.030 0.015 8.2 3.97 12 108 37.29 1.29
2 52.4 0.60 0.00 7.5 10.4 0.020 0.005 13.9 6.67 15 124 44.74 1.95
4 48.8 0.00 0.00 7.7 10.4 0.043 0.003 17.9 3.65 18 140 51.96 2.44
6 43.0 0.00 0.00 7.6 10.3 0.030 0.003 24.0 5.75 21 160 58.90 3.17
8 34.0 0.70 0.00 7.2 10.4 0.015 0.003 29.0 9.04 23 218 62.98 3.87
12 31.3 0.00 0.00 9.2 10.2 0.045 0.003 39.8 2.68 24 224 64.59 5.08
24 27.2 0.74 0.00 8.7 10.4 0.013 0.003 55.4 4.12 25 350 66.07 7.03
36 20.3 0.54 0.00 9.4 10.7 0.023 0.003 75.4 6.93 27 358 68.65 9.26
48 20.3 0.00 0.00 8.7 10.6 0.025 0.003 105.0 33 384 74.41 12.57
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (g) (%) (ppm) (g) (%) 1. NaCN Addition : 1.19 (Kg/t)
2. NaCN Consumption : 1.03 (Kg/t)
3000.0 0.18 540 25.59 525 1575000 87.43 3. Lime Consumption : 0.55 (Kg/t)
2000.0 0.003 5 0.24 105 210000 11.66 4. Perth Tap Water Used : 1.000 (SG)
42.8 896 42.48 8752 0.49 5. Water weight to leach: 2000.0 (g)
20.3 33.0 669 31.70 384 7784 0.43 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
74.41 12.57 start of cyanidation.
Total 2110 100.00 1801536 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 0.70 601 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 0.90 / 0.72 522
* Carbon samples removed at each sampling interval.
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH 4190
MT TODD VARIABILITY COMPOSITE # 24GRIND P80 : 125 µmWATER PERTH TAP WATERDATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 4.7 8.6
0 63.1 1.00 1.28 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 57.4 0.00 0.00 7.4 10.3 0.033 0.020 6.9 5.69 30 76 51.67 1.18
2 50.1 0.50 0.00 7.5 10.3 0.025 0.020 10.0 7.33 36 98 60.88 1.63
4 41.0 0.00 0.00 7.7 10.4 0.040 0.010 12.6 9.11 42 112 68.37 2.01
6 34.3 0.00 0.00 7.7 10.4 0.033 0.003 16.3 6.70 45 154 71.26 2.59
8 28.2 0.54 0.00 7.8 10.4 0.023 0.003 18.3 6.10 46 168 72.17 2.88
12 23.6 0.00 0.00 9.3 10.4 0.030 0.003 24.5 4.53 48 186 73.68 3.70
24 18.6 0.90 1.67 8.7 9.2 0.005 0.003 51.6 5.07 51 251 75.57 7.25
36 15.2 0.70 0.00 9.1 10.7 0.015 0.003 60.0 3.40 59 350 79.54 8.44
48 15.2 0.00 0.00 8.7 10.3 0.030 0.003 62.8 60 730 79.95 9.16
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (g) (%) (ppm) (g) (%) 1. NaCN Addition : 1.21 (Kg/t)
2. NaCN Consumption : 1.04 (Kg/t)
3000.0 0.25 750 20.05 475 1425000 90.84 3. Lime Consumption : 0.98 (Kg/t)
2000.0 0.003 5 0.13 63 125600 8.01 4. Perth Tap Water Used : 1.000 (SG)
47.9 2076 55.51 7100 0.45 5. Water weight to leach: 2000.0 (g)
15.2 60.0 909 24.31 730 11060 0.70 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
79.95 9.16 start of cyanidation.
Total 3740 100.00 1568760 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 1.25 523 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 1.46 / 1.43 464
* Carbon samples removed at each sampling interval.
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575CLIENT VISTA GOLD CORPORATIONTEST No WH 4191
MT TODD VARIABILITY COMPOSITE # 25GRIND P80 : 125 µmWATER PERTH TAP WATERDATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 3.4 8.5
0 63.1 1.00 1.20 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 57.9 0.00 0.00 5.3 10.3 0.030 0.045 9.8 5.20 39 86 48.78 1.00
2 48.9 0.60 0.00 7.3 10.3 0.020 0.025 13.7 8.94 51 122 61.30 1.39
4 39.5 0.00 0.00 7.3 10.4 0.045 0.010 17.5 9.47 63 146 71.96 1.74
6 34.0 0.00 0.00 7.6 10.4 0.033 0.003 22.7 5.43 65 166 73.19 2.19
8 28.9 0.50 0.00 7.6 10.4 0.025 0.003 25.9 5.10 66 200 73.84 2.49
12 24.5 0.00 0.00 9.4 10.4 0.040 0.003 34.0 4.47 69 208 75.50 3.15
24 20.1 0.90 0.00 8.7 9.8 0.005 0.015 44.3 4.35 76 386 79.25 4.16
36 16.3 0.90 2.96 9.4 9.4 0.005 0.003 61.1 3.78 81 640 80.70 5.71
48 16.3 0.00 0.00 8.8 10.7 0.028 0.003 120.0 84 1046 81.64 10.72
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (g) (%) (ppm) (g) (%) 1. NaCN Addition : 1.30 (Kg/t)
2. NaCN Consumption : 1.13 (Kg/t)
3000.0 0.32 960 18.36 740 2220000 89.28 3. Lime Consumption : 1.39 (Kg/t)
2000.0 0.003 5 0.10 120 240000 9.65 4. Perth Tap Water Used : 1.000 (SG)
46.7 2890 55.28 9423 0.38 5. Water weight to leach: 2000.0 (g)
16.3 84.0 1373 26.26 1046 17092 0.69 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
81.64 10.72 start of cyanidation.
Total 5228 100.00 2486514 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 1.74 829 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 1.93 / 2.14 742
* Carbon samples removed at each sampling interval.
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575
CLIENT VISTA GOLD CORPORATION
TEST No WH 4192
MT TODD VARIABILITY COMPOSITE # 26GRIND P80 : 125 µm
WATER PERTH TAP WATER
DATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 0.7 8.3
0 63.1 1.00 1.99 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 59.3 0.00 0.00 4.5 10.4 0.030 0.040 11.3 3.83 21 66 47.99 1.21
2 55.4 0.60 0.00 5.8 10.3 0.020 0.025 18.4 3.87 27 82 59.12 1.89
4 51.7 0.00 0.00 7.0 10.4 0.038 0.020 30.7 3.73 30 148 64.45 3.16
6 48.2 0.00 0.00 7.6 10.3 0.028 0.010 40.5 3.50 33 202 69.06 4.17
8 44.2 0.64 0.00 7.6 10.3 0.018 0.005 48.0 3.99 35 256 72.01 4.96
12 39.4 0.00 0.00 7.8 10.4 0.033 0.005 66.7 4.72 36 264 73.52 6.66
24 35.5 0.84 0.00 8.7 10.1 0.008 0.003 80.3 3.91 36 542 73.35 8.38
36 29.4 0.74 0.00 8.1 10.2 0.013 0.003 122.0 6.18 36 618 73.35 12.26
48 29.4 0.00 0.00 9.6 10.4 0.023 0.003 143.0 36 664 73.35 14.21
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (mg) (%) (ppm) (mg) (%) 1. NaCN Addition : 1.27 (Kg/t)
2. NaCN Consumption : 1.13 (Kg/t)
3000.0 0.26 780 26.65 635 1905000 85.79 3. Lime Consumption : 0.66 (Kg/t)
2000.0 0.003 5 0.17 143 286000 12.88 4. Perth Tap Water Used : 1.000 (SG)
33.7 1085 37.08 10035 0.45 5. Water weight to leach: 2000.0 (g)
29.4 36.0 1057 36.10 664 19488 0.88 6. Grind Size P 80 : 125 (µm)
7. 0.0 g carbon was added to the slurry at the
73.35 14.21 start of cyanidation.
Total 2927 100.00 2220524 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 0.98 740 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 1.01 / 1.04 662
* Carbon samples removed at each sampling interval.
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575
CLIENT VISTA GOLD CORPORATION
TEST No WH 4193
MT TODD VARIABILITY COMPOSITE # 27GRIND P80 : 125 µm
WATER PERTH TAP WATER
DATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 4.7 8.3
0 63.1 1.00 1.25 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 59.7 0.00 0.00 6.6 11.3 0.033 0.015 7.8 3.38 21 34 65.19 1.06
2 57.5 0.50 0.00 7.5 10.2 0.025 0.005 10.5 2.25 24 64 72.85 1.49
4 53.0 0.00 0.00 7.6 10.3 0.033 0.003 16.6 4.49 25 122 75.37 2.41
6 48.4 0.50 0.00 9.1 10.4 0.025 0.003 21.7 4.52 26 174 77.92 3.18
8 42.9 0.00 0.00 8.5 10.6 0.040 0.003 27.1 5.55 26 176 77.92 3.83
12 38.8 0.60 0.00 8.4 10.5 0.020 0.003 38.1 4.05 26 192 77.92 5.19
24 34.6 0.80 0.00 9.0 10.4 0.010 0.005 56.8 4.23 27 338 80.03 7.75
36 29.4 0.60 0.00 8.4 10.5 0.020 0.003 81.4 5.19 27 418 79.79 10.85
48 29.4 0.00 0.00 9.8 10.5 0.018 0.003 107.0 27 558 79.79 14.15
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (mg) (%) (ppm) (mg) (%) 1. NaCN Addition : 1.33 (Kg/t)
2. NaCN Consumption : 1.21 (Kg/t)
3000.0 0.14 420 20.21 480 1440000 85.85 3. Lime Consumption : 0.42 (Kg/t)
2000.0 0.003 5 0.24 107 214000 12.76 4. Perth Tap Water Used : 1.000 (SG)
33.7 859 41.32 6947 0.41 5. Water weight to leach: 2000.0 (g)
29.4 27.0 794 38.23 558 16416 0.98 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
79.79 14.15 start of cyanidation.
Total 2078 100.00 1677363 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 0.69 559 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 0.71 / 0.70 474
* Carbon samples removed at each sampling interval.
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575
CLIENT VISTA GOLD CORPORATION
TEST No WH 4194
MT TODD VARIABILITY COMPOSITE # 28GRIND P80 : 125 µm
WATER PERTH TAP WATER
DATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 2.5 8.3
0 63.1 1.00 1.00 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 60.3 0.00 0.00 7.1 10.2 0.030 0.010 6.3 2.74 9 32 44.46 0.83
2 58.4 0.50 0.00 7.1 10.2 0.025 0.003 9.0 1.95 11 72 52.45 1.27
4 55.2 0.00 0.00 7.4 10.4 0.033 0.003 14.0 3.18 12 94 56.87 1.91
6 49.7 0.50 0.00 8.6 10.4 0.025 0.003 18.2 5.56 13 138 61.04 2.53
8 46.5 0.00 0.00 8.2 10.6 0.040 0.003 22.5 3.19 14 148 64.80 3.05
12 41.3 0.00 0.00 8.2 10.6 0.028 0.003 31.1 5.21 15 192 68.31 4.14
24 36.4 0.90 0.00 8.9 10.2 0.005 0.003 43.7 4.82 17 354 74.55 5.95
36 30.0 0.74 0.00 8.3 10.6 0.013 0.003 66.3 6.40 18 384 77.31 8.58
48 30.0 0.00 0.00 9.6 10.7 0.020 0.003 90.0 18 460 77.31 11.40
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (mg) (%) (ppm) (mg) (%) 1. NaCN Addition : 1.21 (Kg/t)
2. NaCN Consumption : 1.08 (Kg/t)
3000.0 0.10 300 22.69 520 1560000 88.60 3. Lime Consumption : 0.33 (Kg/t)
2000.0 0.003 5 0.38 90 180000 10.22 4. Perth Tap Water Used : 1.000 (SG)
33.1 477 36.04 6931 0.39 5. Water weight to leach: 2000.0 (g)
30.0 18.0 541 40.89 460 13814 0.78 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
77.31 11.40 start of cyanidation.
Total 1322 100.00 1760744 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 0.44 587 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 0.51 / 0.54 522
* Carbon samples removed at each sampling interval.
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575
CLIENT VISTA GOLD CORPORATION
TEST No WH 4195
MT TODD VARIABILITY COMPOSITE # 29GRIND P80 : 125 µm
WATER PERTH TAP WATER
DATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 3.9 8.2
0 63.1 1.00 1.14 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 59.3 0.00 0.00 7.6 10.4 0.030 0.040 10.2 3.80 51 64 53.58 1.30
2 55.4 0.54 0.00 7.0 10.3 0.023 0.015 13.9 3.84 57 88 58.55 1.77
4 51.5 0.00 0.00 7.4 10.2 0.043 0.005 18.7 3.96 60 118 60.93 2.37
6 47.5 0.00 0.00 7.7 10.5 0.035 0.003 21.8 4.02 63 164 63.35 2.83
8 41.1 0.60 0.00 8.3 10.7 0.020 0.003 24.8 6.37 64 168 64.13 3.16
12 35.9 0.00 0.00 8.3 10.8 0.043 0.003 29.6 5.21 65 194 64.79 3.72
24 31.0 0.80 0.00 8.9 10.5 0.010 0.003 37.7 4.87 66 202 65.38 4.60
36 24.6 0.00 0.00 8.3 10.6 0.033 0.003 48.2 6.42 69 254 66.89 5.80
48 24.6 0.00 0.00 9.8 10.5 0.015 0.003 53.6 75 416 69.29 6.59
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (mg) (%) (ppm) (mg) (%) 1. NaCN Addition : 0.98 (Kg/t)
2. NaCN Consumption : 0.86 (Kg/t)
3000.0 0.63 1890 30.71 585 1755000 93.41 3. Lime Consumption : 0.38 (Kg/t)
2000.0 0.003 5 0.08 54 107200 5.71 4. Perth Tap Water Used : 1.000 (SG)
38.5 2414 39.23 6403 0.34 5. Water weight to leach: 2000.0 (g)
24.6 75.0 1844 29.97 416 10229 0.54 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
69.29 6.59 start of cyanidation.
Total 6154 100.00 1878832 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 2.05 626 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 2.31 / 2.35 528
* Carbon samples removed at each sampling interval.
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
GOLD & COPPER EXTRACTION CALCULATIONS
Final Carbon (g)
Total Extraction
GOLD COPPER COMMENTS :
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575
CLIENT VISTA GOLD CORPORATION
TEST No WH 4196
MT TODD VARIABILITY COMPOSITE # 30GRIND P80 : 125 µm
WATER PERTH TAP WATER
DATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 3.8 8.1
0 63.1 1.00 0.98 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 59.5 0.00 0.00 6.6 10.3 0.033 0.035 7.6 3.61 66 56 43.91 0.79
2 55.7 0.00 0.00 6.9 10.3 0.028 0.015 8.7 3.76 75 78 49.05 0.94
4 50.9 0.54 0.00 7.5 10.4 0.023 0.010 10.7 4.80 81 116 52.41 1.19
6 45.2 0.00 0.00 8.7 10.5 0.043 0.005 12.7 5.71 89 138 56.53 1.41
8 40.3 0.00 0.00 8.1 10.6 0.038 0.005 14.6 4.90 93 172 58.41 1.63
12 33.2 0.00 0.00 8.2 10.4 0.028 0.005 17.7 7.10 96 204 59.66 1.94
24 28.3 0.90 0.00 8.9 10.1 0.005 0.003 19.1 4.95 105 290 62.71 2.18
36 23.4 0.00 0.00 8.3 10.3 0.033 0.003 24.9 4.82 111 294 64.47 2.67
48 23.4 0.00 0.00 9.7 10.2 0.015 0.003 27.7 113 396 64.83 3.01
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (mg) (%) (ppm) (mg) (%) 1. NaCN Addition : 0.81 (Kg/t)
2. NaCN Consumption : 0.70 (Kg/t)
3000.0 1.13 3390 35.17 770 2310000 96.99 3. Lime Consumption : 0.33 (Kg/t)
2000.0 0.003 5 0.05 28 55400 2.33 4. Perth Tap Water Used : 1.000 (SG)
39.7 3609 37.44 6984 0.29 5. Water weight to leach: 2000.0 (g)
23.4 112.5 2636 27.34 396 9278 0.39 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
64.83 3.01 start of cyanidation.
Total 9640 100.00 2381662 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 3.21 794 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 3.83 / 3.76 680
* Carbon samples removed at each sampling interval.
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
GOLD & COPPER EXTRACTION CALCULATIONS
Final Carbon (g)
Total Extraction
GOLD COPPER COMMENTS :
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575
CLIENT VISTA GOLD CORPORATION
TEST No WH 4197
MT TODD VARIABILITY COMPOSITE # 31GRIND P80 : 125 µm
WATER PERTH TAP WATER
DATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 6.4 8.3
0 63.1 1.00 1.12 11.1 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 59.2 0.00 0.00 6.7 10.3 0.030 0.015 3.8 3.85 15 46 66.19 1.25
2 54.3 0.54 0.00 6.9 10.4 0.023 0.003 4.1 4.89 16 52 68.51 1.38
4 50.1 0.00 0.00 7.5 10.6 0.040 0.015 5.0 4.23 17 54 73.89 1.59
6 45.8 0.00 0.00 8.8 10.5 0.038 0.003 5.8 4.32 18 58 75.59 1.80
8 41.7 0.00 0.00 8.2 10.2 0.030 0.003 5.8 4.11 18 70 75.59 1.89
12 37.8 0.00 0.00 8.5 10.2 0.028 0.003 6.3 3.91 18 80 75.59 2.05
24 33.3 0.84 0.00 9.1 10.2 0.008 0.003 6.6 4.44 18 84 75.59 2.13
36 27.6 0.50 0.00 8.3 10.5 0.025 0.003 8.9 5.71 18 106 75.59 2.77
48 27.6 0.00 0.00 9.8 10.7 0.030 0.003 10.8 18 122 75.59 3.28
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (mg) (%) (ppm) (mg) (%) 1. NaCN Addition : 0.96 (Kg/t)
2. NaCN Consumption : 0.78 (Kg/t)
3000.0 0.12 360 24.41 270 810000 96.72 3. Lime Consumption : 0.37 (Kg/t)
2000.0 0.003 5 0.34 11 21600 2.58 4. Perth Tap Water Used : 1.000 (SG)
35.5 613 41.54 2489 0.30 5. Water weight to leach: 2000.0 (g)
27.6 18.0 497 33.71 122 3370 0.40 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
75.59 3.28 start of cyanidation.
Total 1475 100.00 837459 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 0.49 279 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 0.57 / 0.52 250
* Carbon samples removed at each sampling interval.
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
GOLD & COPPER EXTRACTION CALCULATIONS
Final Carbon (g)
Total Extraction
GOLD COPPER COMMENTS :
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575
CLIENT VISTA GOLD CORPORATION
TEST No WH 4198
MT TODD VARIABILITY COMPOSITE # 32GRIND P80 : 125 µm
WATER PERTH TAP WATER
DATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 6.6 8.3
0 63.1 1.00 1.01 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 59.4 0.00 0.00 7.1 10.3 0.038 0.005 2.1 3.64 12 20 60.64 1.07
2 54.7 0.00 0.00 7.0 10.4 0.033 0.010 2.8 4.71 12 24 61.43 1.38
4 51.1 0.00 0.00 7.6 10.5 0.028 0.003 3.4 3.60 13 28 64.57 1.65
6 47.9 0.54 0.00 8.8 10.6 0.023 0.003 3.7 3.25 14 32 68.61 1.81
8 44.1 0.00 0.00 8.3 10.6 0.035 0.010 4.2 3.78 14 36 69.80 2.06
12 37.9 0.00 0.00 8.5 10.7 0.030 0.005 4.4 6.25 15 38 72.49 2.14
24 34.5 0.80 0.00 9.2 10.3 0.010 0.003 4.4 3.39 16 40 75.09 2.17
36 30.2 0.50 0.00 8.4 10.5 0.025 0.003 6.0 4.28 16 42 75.09 2.80
48 30.2 0.00 0.00 9.9 10.5 0.030 0.003 7.0 17 50 76.28 3.23
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (mg) (%) (ppm) (mg) (%) 1. NaCN Addition : 0.95 (Kg/t)
2. NaCN Consumption : 0.77 (Kg/t)
3000.0 0.10 300 23.72 165 495000 96.77 3. Lime Consumption : 0.34 (Kg/t)
2000.0 0.003 5 0.40 7 13960 2.73 4. Perth Tap Water Used : 1.000 (SG)
32.9 462 36.52 1080 0.21 5. Water weight to leach: 2000.0 (g)
30.2 16.5 498 39.37 50 1509 0.29 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
76.28 3.23 start of cyanidation.
Total 1265 100.00 511549 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 0.42 171 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 0.33 / 0.36 156
* Carbon samples removed at each sampling interval.
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
GOLD & COPPER EXTRACTION CALCULATIONS
Final Carbon (g)
Total Extraction
GOLD COPPER COMMENTS :
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575
CLIENT VISTA GOLD CORPORATION
TEST No WH 4199
MT TODD VARIABILITY COMPOSITE # 33GRIND P80 : 125 µm
WATER PERTH TAP WATER
DATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 7.5 8.4
0 63.1 1.00 1.31 11.1 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 60.0 0.00 0.00 6.7 10.4 0.033 0.005 4.8 3.08 3 22 38.43 2.75
2 54.2 0.00 0.00 7.0 10.4 0.030 0.003 6.5 5.82 5 28 60.61 3.66
4 49.9 0.54 0.00 7.7 10.5 0.023 0.003 8.1 4.24 6 40 71.07 4.61
6 46.1 0.00 0.00 8.8 10.6 0.043 0.003 9.3 3.84 6 50 71.07 5.35
8 42.3 0.00 0.00 8.3 10.7 0.033 0.003 10.7 3.77 6 66 71.07 6.23
12 37.1 0.00 0.00 8.4 10.6 0.028 0.003 13.3 5.20 6 88 71.07 7.76
24 32.7 0.90 0.00 9.2 10.1 0.005 0.003 14.6 4.40 6 126 71.07 8.75
36 28.3 0.50 0.00 8.5 10.4 0.025 0.003 18.2 4.42 6 160 71.07 10.82
48 28.3 0.00 0.00 9.8 10.4 0.018 0.003 24.8 6 164 71.07 14.14
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (mg) (%) (ppm) (mg) (%) 1. NaCN Addition : 0.98 (Kg/t)
2. NaCN Consumption : 0.85 (Kg/t)
3000.0 0.05 150 28.93 115 345000 85.86 3. Lime Consumption : 0.44 (Kg/t)
2000.0 0.003 5 0.96 25 49600 12.34 4. Perth Tap Water Used : 1.000 (SG)
34.8 194 37.34 2560 0.64 5. Water weight to leach: 2000.0 (g)
28.3 6.0 170 32.76 164 4643 1.16 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
71.07 14.14 start of cyanidation.
Total 518 100.00 401803 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 0.17 134 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 0.23 / 0.22 122
* Carbon samples removed at each sampling interval.
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
GOLD & COPPER EXTRACTION CALCULATIONS
Final Carbon (g)
Total Extraction
GOLD COPPER COMMENTS :
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575
CLIENT VISTA GOLD CORPORATION
TEST No WH 4200
MT TODD VARIABILITY COMPOSITE # 34GRIND P80 : 125 µm
WATER PERTH TAP WATER
DATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 7.0 8.3
0 63.1 1.00 1.12 11.1 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 58.8 0.00 0.00 7.4 1.3 0.030 0.001 6.7 4.25 11 64 64.36 0.69
2 55.7 0.60 0.00 7.6 10.4 0.020 0.003 8.8 3.12 12 66 70.17 0.86
4 51.9 0.00 0.00 7.7 10.6 0.043 0.003 10.6 3.81 12 72 70.17 1.02
6 46.7 0.00 0.00 9.1 10.7 0.038 0.003 11.4 5.25 12 76 70.17 1.10
8 42.0 0.54 0.00 8.4 10.6 0.023 0.003 12.9 4.61 12 84 70.17 1.23
12 37.9 0.00 0.00 8.4 10.7 0.040 0.003 15.1 4.15 12 92 70.17 1.42
24 32.4 0.70 0.00 9.1 10.2 0.015 0.003 16.5 5.49 13 130 73.68 1.59
36 28.3 0.54 0.00 8.4 10.2 0.023 0.003 22.1 4.08 13 134 73.68 2.04
48 28.3 0.00 0.00 9.9 10.2 0.025 0.003 26.4 14 196 74.99 2.45
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (mg) (%) (ppm) (mg) (%) 1. NaCN Addition : 1.13 (Kg/t)
2. NaCN Consumption : 0.96 (Kg/t)
3000.0 0.09 270 25.01 815 2445000 97.55 3. Lime Consumption : 0.37 (Kg/t)
2000.0 0.003 5 0.46 26 52800 2.11 4. Perth Tap Water Used : 1.000 (SG)
34.8 422 39.12 3181 0.13 5. Water weight to leach: 2000.0 (g)
28.3 13.5 382 35.41 196 5551 0.22 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
74.99 2.45 start of cyanidation.
Total 1080 100.00 2506531 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 0.36 836 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 0.39 / 0.37 762
* Carbon samples removed at each sampling interval.
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
GOLD & COPPER EXTRACTION CALCULATIONS
Final Carbon (g)
Total Extraction
GOLD COPPER COMMENTS :
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575
CLIENT VISTA GOLD CORPORATION
TEST No WH 4201
MT TODD VARIABILITY COMPOSITE # 35GRIND P80 : 125 µm
WATER PERTH TAP WATER
DATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 6.1 8.3
0 63.1 1.00 1.00 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 59.8 0.00 0.00 8.3 10.3 0.030 0.005 4.3 3.33 11 30 68.43 1.09
2 55.3 0.00 0.00 7.3 10.4 0.028 0.003 5.4 4.45 12 44 73.75 1.40
4 50.9 0.60 0.00 7.9 10.4 0.020 0.003 6.4 4.37 12 52 73.75 1.67
6 46.5 0.00 0.00 8.6 10.6 0.040 0.003 7.4 4.42 12 56 73.75 1.88
8 42.4 0.00 0.00 8.5 10.6 0.035 0.003 8.5 4.07 12 58 73.75 2.14
12 38.7 0.00 0.00 8.4 10.7 0.028 0.003 10.1 3.79 12 78 73.75 2.55
24 33.2 0.84 0.00 9.1 10.0 0.008 0.003 9.9 5.43 12 90 73.75 2.55
36 29.1 0.70 0.00 8.4 10.4 0.015 0.003 16.9 4.12 12 90 73.75 4.01
48 29.1 0.00 0.00 9.8 10.6 0.025 0.003 20.0 12 150 73.75 4.84
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (mg) (%) (ppm) (mg) (%) 1. NaCN Addition : 1.05 (Kg/t)
2. NaCN Consumption : 0.89 (Kg/t)
3000.0 0.09 270 26.25 305 915000 95.16 3. Lime Consumption : 0.33 (Kg/t)
2000.0 0.003 5 0.49 20 40000 4.16 4. Perth Tap Water Used : 1.000 (SG)
34.0 404 39.32 2162 0.22 5. Water weight to leach: 2000.0 (g)
29.1 12.0 349 33.95 150 4365 0.45 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
73.75 4.84 start of cyanidation.
Total 1029 100.00 961527 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 0.34 321 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 0.36 / 0.39 312
* Carbon samples removed at each sampling interval.
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
GOLD & COPPER EXTRACTION CALCULATIONS
Final Carbon (g)
Total Extraction
GOLD COPPER COMMENTS :
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575
CLIENT VISTA GOLD CORPORATION
TEST No WH 4202
MT TODD VARIABILITY COMPOSITE # 36GRIND P80 : 125 µm
WATER PERTH TAP WATER
DATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 7.8 8.3
0 63.1 1.00 0.86 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 59.4 0.00 0.00 7.3 10.3 0.030 0.010 4.3 3.68 24 36 68.35 0.67
2 54.8 0.54 0.00 7.6 10.4 0.023 0.005 5.0 4.63 25 52 70.55 0.81
4 50.2 0.00 0.00 7.9 10.6 0.040 0.003 5.6 4.59 27 66 75.21 0.94
6 45.6 0.00 0.00 9.0 10.7 0.033 0.003 6.3 4.55 28 72 77.44 1.05
8 40.6 0.54 0.00 8.7 10.7 0.023 0.003 7.3 5.00 29 74 79.48 1.17
12 36.9 0.00 0.00 8.6 10.8 0.043 0.003 8.1 3.74 30 88 81.29 1.31
24 32.3 0.64 0.00 9.1 10.3 0.018 0.003 8.7 4.55 30 106 81.29 1.42
36 27.8 0.54 0.00 8.6 10.3 0.023 0.003 11.8 4.53 30 116 81.29 1.83
48 27.8 0.00 0.00 9.9 10.4 0.020 0.003 16.9 30 166 81.29 2.54
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (mg) (%) (ppm) (mg) (%) 1. NaCN Addition : 1.09 (Kg/t)
2. NaCN Consumption : 0.95 (Kg/t)
3000.0 0.14 420 18.71 525 1575000 97.46 3. Lime Consumption : 0.29 (Kg/t)
2000.0 0.003 5 0.22 17 33800 2.09 4. Perth Tap Water Used : 1.000 (SG)
35.3 985 43.89 2711 0.17 5. Water weight to leach: 2000.0 (g)
27.8 30.0 834 37.17 166 4616 0.29 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
81.29 2.54 start of cyanidation.
Total 2244 100.00 1616127 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 0.75 539 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 0.86 / 0.91 486
* Carbon samples removed at each sampling interval.
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
GOLD & COPPER EXTRACTION CALCULATIONS
Final Carbon (g)
Total Extraction
GOLD COPPER COMMENTS :
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575
CLIENT VISTA GOLD CORPORATION
TEST No WH 4203
MT TODD VARIABILITY COMPOSITE # 37GRIND P80 : 125 µm
WATER PERTH TAP WATER
DATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 7.5 8.3
0 63.1 1.00 1.01 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 59.7 0.00 0.00 9.1 10.3 0.030 0.015 6.1 3.37 25 66 55.76 0.76
2 55.2 0.50 0.00 8.2 10.3 0.025 0.003 7.0 4.49 26 92 56.96 0.92
4 51.5 0.00 0.00 9.3 10.5 0.038 0.003 8.5 3.76 27 116 58.88 1.12
6 45.9 0.00 0.00 9.4 10.6 0.028 0.003 9.2 5.61 28 134 60.67 1.23
8 41.6 0.54 0.00 8.9 10.6 0.023 0.003 10.1 4.28 30 138 63.85 1.32
12 37.0 0.00 0.00 8.6 10.7 0.038 0.003 11.8 4.57 32 144 66.73 1.49
24 31.8 0.84 0.00 9.1 10.0 0.008 0.003 12.9 5.19 36 178 71.87 1.65
36 26.8 0.74 0.00 8.6 10.1 0.013 0.003 24.4 5.05 40 198 76.28 2.75
48 26.8 0.00 0.00 9.9 10.2 0.023 0.003 32.6 42 304 78.14 3.65
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (mg) (%) (ppm) (mg) (%) 1. NaCN Addition : 1.21 (Kg/t)
2. NaCN Consumption : 1.06 (Kg/t)
3000.0 0.21 630 21.86 690 2070000 96.35 3. Lime Consumption : 0.34 (Kg/t)
2000.0 0.003 5 0.17 33 65200 3.03 4. Perth Tap Water Used : 1.000 (SG)
36.3 1123 38.97 4996 0.23 5. Water weight to leach: 2000.0 (g)
26.8 42.0 1124 39.00 304 8135 0.38 6. Grind Size P 80 : 125 (µm)
7. 0.0 g carbon was added to the slurry at the
78.14 3.65 start of cyanidation.
Total 2882 100.00 2148331 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 0.96 716 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 1.25 / 1.18 642
* Carbon samples removed at each sampling interval.
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
GOLD & COPPER EXTRACTION CALCULATIONS
Final Carbon (g)
Total Extraction
GOLD COPPER COMMENTS :
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575
CLIENT VISTA GOLD CORPORATION
TEST No WH 4204
MT TODD VARIABILITY COMPOSITE # 38GRIND P80 : 125 µm
WATER PERTH TAP WATER
DATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 7.8 8.3
0 63.1 1.00 1.08 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 58.4 0.00 0.00 8.0 10.3 0.030 0.005 9.8 4.65 18 96 57.64 1.08
2 54.7 0.54 0.00 7.5 10.3 0.023 0.003 12.2 3.73 19 146 60.33 1.40
4 51.0 0.00 0.00 8.7 10.5 0.035 0.003 16.1 3.71 21 168 65.83 1.77
6 46.4 0.00 0.00 8.9 10.6 0.030 0.003 18.8 4.57 22 182 68.40 2.03
8 41.7 0.54 0.00 8.7 10.6 0.023 0.003 20.3 4.76 23 192 70.73 2.18
12 37.7 0.00 0.00 8.5 10.7 0.030 0.003 26.9 4.01 24 204 72.83 2.75
24 32.1 0.84 0.00 9.1 10.2 0.008 0.003 30.0 5.57 24 296 72.83 3.15
36 26.8 0.70 0.00 8.5 10.3 0.015 0.003 42.4 5.26 24 304 72.83 4.20
48 26.8 0.00 0.00 9.8 10.3 0.018 0.003 52.1 24 444 72.83 5.17
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (mg) (%) (ppm) (mg) (%) 1. NaCN Addition : 1.21 (Kg/t)
2. NaCN Consumption : 1.08 (Kg/t)
3000.0 0.18 540 27.17 755 2265000 94.83 3. Lime Consumption : 0.36 (Kg/t)
2000.0 0.003 5 0.25 52 104200 4.36 4. Perth Tap Water Used : 1.000 (SG)
36.3 799 40.19 7426 0.31 5. Water weight to leach: 2000.0 (g)
26.8 24.0 644 32.39 444 11908 0.50 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
72.83 5.17 start of cyanidation.
Total 1987 100.00 2388534 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 0.66 796 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 0.75 / 0.68 680
* Carbon samples removed at each sampling interval.
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
GOLD & COPPER EXTRACTION CALCULATIONS
Final Carbon (g)
Total Extraction
GOLD COPPER COMMENTS :
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575
CLIENT VISTA GOLD CORPORATION
TEST No WH 4205
MT TODD VARIABILITY COMPOSITE # 39GRIND P80 : 125 µm
WATER PERTH TAP WATER
DATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 4.5 8.1
0 63.1 1.00 1.04 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 58.6 0.00 0.00 7.5 10.2 0.030 0.040 10.6 4.52 45 118 41.97 0.98
2 54.4 0.54 0.00 7.1 10.2 0.023 0.025 14.3 4.14 60 156 54.17 1.31
4 50.5 0.00 0.00 8.4 10.4 0.035 0.015 21.6 3.93 75 170 65.62 1.84
6 46.5 0.00 0.00 8.9 10.5 0.028 0.010 25.7 4.04 84 174 72.01 2.13
8 41.7 0.60 0.00 8.8 10.5 0.020 0.010 28.6 4.72 90 178 76.02 2.33
12 36.6 0.00 0.00 8.3 10.5 0.033 0.005 39.2 5.15 93 270 77.68 3.19
24 32.6 0.84 0.00 8.9 9.9 0.008 0.003 52.6 3.95 98 346 80.24 4.20
36 26.4 0.74 0.00 8.6 10.1 0.013 0.003 77.8 6.23 102 412 82.11 6.01
48 26.4 0.00 0.00 9.9 10.3 0.018 0.003 105.0 107 484 83.82 7.94
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (mg) (%) (ppm) (mg) (%) 1. NaCN Addition : 1.24 (Kg/t)
2. NaCN Consumption : 1.12 (Kg/t)
3000.0 0.38 1125 16.18 895 2685000 92.06 3. Lime Consumption : 0.35 (Kg/t)
2000.0 0.003 5 0.07 105 210000 7.20 4. Perth Tap Water Used : 1.000 (SG)
36.7 3012 43.32 8714 0.30 5. Water weight to leach: 2000.0 (g)
26.4 106.5 2812 40.43 484 12778 0.44 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
83.82 7.94 start of cyanidation.
Total 6954 100.00 2916492 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 2.32 972 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 3.04 / 3.79 820
* Carbon samples removed at each sampling interval.
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575
CLIENT VISTA GOLD CORPORATION
TEST No WH 4206
MT TODD VARIABILITY COMPOSITE # 40GRIND P80 : 125 µm
WATER PERTH TAP WATER
DATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 2.6 8.1
0 63.1 1.00 0.99 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 57.3 0.00 0.00 6.1 10.3 0.030 0.025 10.1 5.79 21 60 45.57 0.81
2 53.6 0.50 0.00 6.7 10.3 0.025 0.015 14.1 3.67 27 88 56.30 1.13
4 49.1 0.00 0.00 7.7 10.5 0.033 0.005 21.1 4.54 33 140 66.31 1.69
6 45.0 0.00 0.00 8.6 10.6 0.028 0.003 26.5 4.07 36 172 71.02 2.11
8 41.3 0.60 0.00 8.4 10.6 0.020 0.010 30.7 3.76 38 188 74.50 2.41
12 37.7 0.00 0.00 8.1 10.7 0.000 0.003 45.2 3.52 40 200 76.74 3.41
24 33.0 0.80 0.00 8.9 10.2 0.800 0.003 59.8 4.71 42 312 79.24 4.53
36 26.6 0.00 0.00 8.3 10.4 0.000 0.003 84.1 6.46 43 358 80.34 6.21
48 26.6 0.00 0.00 10.0 10.2 0.000 0.003 94.6 45 746 82.10 7.26
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (mg) (%) (ppm) (mg) (%) 1. NaCN Addition : 0.97 (Kg/t)
2. NaCN Consumption : 0.73 (Kg/t)
3000.0 0.18 540 17.90 920 2760000 92.74 3. Lime Consumption : 0.33 (Kg/t)
2000.0 0.003 5 0.17 95 189200 6.36 4. Perth Tap Water Used : 1.000 (SG)
36.5 1276 42.31 7199 0.24 5. Water weight to leach: 2000.0 (g)
26.6 45.0 1195 39.62 746 19814 0.67 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
82.10 7.26 start of cyanidation.
Total 3017 100.00 2976213 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 1.01 992 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 1.04 / 1.10 842
* Carbon samples removed at each sampling interval.
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575
CLIENT VISTA GOLD CORPORATION
TEST No WH 4207
MT TODD VARIABILITY COMPOSITE # 41GRIND P80 : 125 µm
WATER PERTH TAP WATER
DATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 2.5 8.1
0 63.1 1.00 1.09 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 59.0 0.00 0.00 7.5 10.2 0.030 0.045 8.2 4.07 45 50 62.09 1.15
2 55.5 0.54 0.00 7.4 10.3 0.023 0.015 10.9 3.48 52 54 69.57 1.48
4 51.6 0.00 0.00 8.4 10.5 0.038 0.010 16.5 3.91 57 104 75.24 2.30
6 46.0 0.50 0.00 8.8 10.5 0.025 0.003 20.6 5.67 59 156 77.11 2.93
8 40.7 0.00 0.00 8.6 10.7 0.045 0.003 25.1 5.27 60 168 78.09 3.49
12 36.7 0.00 0.00 8.3 10.7 0.028 0.003 35.5 3.99 62 192 79.81 4.77
24 31.8 0.90 0.00 9.1 10.0 0.005 0.003 39.3 4.94 63 366 80.59 5.59
36 21.9 0.74 0.00 8.5 10.3 0.013 0.003 63.6 9.87 64 412 81.26 8.52
48 21.9 0.00 0.00 9.9 10.4 0.015 0.003 84.9 66 546 82.19 11.19
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (mg) (%) (ppm) (mg) (%) 1. NaCN Addition : 1.23 (Kg/t)
2. NaCN Consumption : 1.11 (Kg/t)
3000.0 0.28 840 17.81 505 1515000 88.81 3. Lime Consumption : 0.36 (Kg/t)
2000.0 0.003 5 0.11 85 169800 9.95 4. Perth Tap Water Used : 1.000 (SG)
41.2 2428 51.47 9209 0.54 5. Water weight to leach: 2000.0 (g)
21.9 66.0 1444 30.61 546 11946 0.70 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
82.19 11.19 start of cyanidation.
Total 4717 100.00 1705955 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 1.57 569 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 1.90 / 1.97 492
* Carbon samples removed at each sampling interval.
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575
CLIENT VISTA GOLD CORPORATION
TEST No WH 4208
MT TODD VARIABILITY COMPOSITE # 42GRIND P80 : 125 µm
WATER PERTH TAP WATER
DATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 4.1 8.1
0 63.1 1.00 1.23 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 59.6 0.00 0.00 7.8 10.3 0.033 0.025 6.9 3.49 33 58 55.60 1.05
2 55.3 0.00 0.00 7.4 10.4 0.028 0.010 9.6 4.34 42 76 68.80 1.45
4 51.9 0.64 0.00 8.8 10.4 0.018 0.003 13.6 3.36 48 138 77.06 2.13
6 48.3 0.00 0.00 8.9 10.6 0.040 0.003 17.8 3.56 50 170 79.76 2.74
8 46.6 0.50 0.00 8.2 10.6 0.025 0.003 22.6 1.75 51 198 81.03 3.40
12 43.2 0.00 0.00 8.4 10.7 0.040 0.003 31.4 3.38 52 206 82.24 4.48
24 37.7 0.80 0.00 9.1 10.3 0.010 0.003 41.3 5.47 53 348 83.37 6.05
36 32.3 0.54 0.00 8.4 10.3 0.023 0.003 62.2 5.48 54 352 84.35 8.58
48 32.3 0.00 0.00 9.9 10.4 0.020 0.003 82.9 54 476 84.35 11.32
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (mg) (%) (ppm) (mg) (%) 1. NaCN Addition : 1.16 (Kg/t)
2. NaCN Consumption : 1.02 (Kg/t)
3000.0 0.20 600 15.65 490 1470000 88.68 3. Lime Consumption : 0.41 (Kg/t)
2000.0 0.003 5 0.13 83 165800 10.00 4. Perth Tap Water Used : 1.000 (SG)
30.8 1488 38.80 6476 0.39 5. Water weight to leach: 2000.0 (g)
32.3 54.0 1742 45.42 476 15351 0.93 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
84.35 11.32 start of cyanidation.
Total 3834 100.00 1657627 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 1.28 553 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 1.18 / 1.27 498
* Carbon samples removed at each sampling interval.
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575
CLIENT VISTA GOLD CORPORATION
TEST No WH 4209
MT TODD VARIABILITY COMPOSITE # 43GRIND P80 : 125 µm
WATER PERTH TAP WATER
DATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 5.4 8.2
0 63.1 1.00 1.08 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 61.9 0.00 0.00 8.3 10.2 0.030 0.015 5.9 1.21 15 84 57.07 1.38
2 59.0 0.54 0.00 7.5 10.2 0.023 0.005 7.5 2.92 18 112 66.75 1.78
4 53.1 0.00 0.00 8.6 10.4 0.043 0.005 11.5 5.87 20 130 73.65 2.52
6 48.6 0.00 0.00 8.9 10.3 0.030 0.003 15.3 4.51 21 146 76.46 3.21
8 44.0 0.64 0.00 7.9 10.4 0.018 0.003 17.6 4.57 22 152 79.30 3.60
12 40.2 0.00 0.00 8.1 10.5 0.043 0.003 23.9 3.85 23 168 81.87 4.68
24 34.4 0.74 0.00 8.2 10.2 0.013 0.003 35.2 5.72 24 278 84.22 6.88
36 29.9 0.00 0.00 8.0 10.2 0.035 0.003 46.3 4.58 24 292 84.22 8.72
48 29.9 0.00 0.00 9.8 10.2 0.018 0.003 52.6 24 380 84.22 9.95
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (mg) (%) (ppm) (mg) (%) 1. NaCN Addition : 0.97 (Kg/t)
2. NaCN Consumption : 0.84 (Kg/t)
3000.0 0.09 270 15.78 370 1110000 90.05 3. Lime Consumption : 0.36 (Kg/t)
2000.0 0.003 5 0.29 53 105200 8.53 4. Perth Tap Water Used : 1.000 (SG)
33.2 719 42.04 6119 0.50 5. Water weight to leach: 2000.0 (g)
29.9 24.0 716 41.88 380 11343 0.92 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
84.22 9.95 start of cyanidation.
Total 1711 100.00 1232662 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 0.57 411 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 0.64 / 0.64 370
* Carbon samples removed at each sampling interval.
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575
CLIENT VISTA GOLD CORPORATION
TEST No WH 4210
MT TODD VARIABILITY COMPOSITE # 44GRIND P80 : 125 µm
WATER PERTH TAP WATER
DATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 2.8 8.1
0 63.1 1.00 0.94 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 61.0 0.00 0.00 7.6 10.3 0.030 0.050 6.8 2.04 51 88 54.51 0.93
2 56.3 0.54 0.00 7.3 10.3 0.023 0.015 8.7 4.78 63 124 65.39 1.22
4 50.6 0.00 0.00 8.5 10.5 0.038 0.005 12.7 5.70 69 152 70.61 1.68
6 45.0 0.50 0.00 8.4 10.6 0.025 0.003 16.0 5.57 72 184 73.02 2.08
8 39.6 0.00 0.00 7.8 10.6 0.043 0.003 18.9 5.41 73 200 73.76 2.39
12 36.4 0.00 0.00 8.4 10.7 0.033 0.003 24.0 3.20 75 202 75.06 2.89
24 30.6 0.84 0.00 9.1 10.0 0.008 0.003 26.3 5.78 76 294 75.66 3.27
36 23.4 0.64 0.00 8.8 10.2 0.018 0.003 34.7 7.23 78 298 76.66 4.09
48 23.4 0.00 0.00 9.9 10.5 0.025 0.003 44.0 81 346 77.82 5.04
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (mg) (%) (ppm) (mg) (%) 1. NaCN Addition : 1.17 (Kg/t)
2. NaCN Consumption : 1.01 (Kg/t)
3000.0 0.45 1350 22.18 655 1965000 94.96 3. Lime Consumption : 0.31 (Kg/t)
2000.0 0.003 5 0.08 44 88000 4.25 4. Perth Tap Water Used : 1.000 (SG)
39.7 2838 46.63 8246 0.40 5. Water weight to leach: 2000.0 (g)
23.4 81.0 1893 31.11 346 8086 0.39 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
77.82 5.04 start of cyanidation.
Total 6086 100.00 2069332 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 2.03 690 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 2.25 / 2.10 652
* Carbon samples removed at each sampling interval.
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575
CLIENT VISTA GOLD CORPORATION
TEST No WH 4WH 4211
MT TODD VARIABILITY COMPOSITE # 45GRIND P80 : 125 µm
WATER PERTH TAP WATER
DATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 1.1 8.1
0 63.1 1.00 1.36 11.3 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 60.0 0.00 0.00 6.6 10.5 0.030 0.065 12.3 3.07 81 122 55.07 0.88
2 55.6 0.54 0.00 6.6 10.5 0.023 0.030 17.5 4.40 96 186 63.80 1.27
4 50.8 0.00 0.00 8.1 10.5 0.035 0.010 26.7 4.78 114 252 73.90 1.87
6 46.7 0.00 0.00 8.5 10.6 0.030 0.005 34.6 4.14 123 282 78.60 2.34
8 41.2 0.70 0.00 7.6 10.6 0.015 0.005 40.4 5.48 126 322 80.08 2.70
12 36.7 0.00 0.00 8.1 10.7 0.048 0.005 53.3 4.54 129 374 81.38 3.46
24 30.1 0.80 0.00 8.9 10.2 0.010 0.003 66.5 6.58 132 460 82.48 4.27
36 25.4 0.64 0.00 8.2 10.3 0.018 0.003 92.9 4.68 138 460 84.38 5.71
48 25.4 0.00 0.00 9.8 10.5 0.025 0.003 122.0 141 562 85.18 7.36
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (mg) (%) (ppm) (mg) (%) 1. NaCN Addition : 1.23 (Kg/t)
2. NaCN Consumption : 1.07 (Kg/t)
3000.0 0.47 1410 14.82 1135 3405000 92.64 3. Lime Consumption : 0.45 (Kg/t)
2000.0 0.003 5 0.05 122 244000 6.64 4. Perth Tap Water Used : 1.000 (SG)
37.7 4516 47.47 12207 0.33 5. Water weight to leach: 2000.0 (g)
25.4 141.0 3583 37.66 562 14280 0.39 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
85.18 7.36 start of cyanidation.
Total 9514 100.00 3675488 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 3.17 1225 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 3.77 / 3.78 1088
* Carbon samples removed at each sampling interval.
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575
CLIENT VISTA GOLD CORPORATION
TEST No WH 4212
MT TODD VARIABILITY COMPOSITE # 46GRIND P80 : 125 µm
WATER PERTH TAP WATER
DATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 0.9 8.1
0 63.1 1.00 1.58 11.0 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 56.9 0.00 0.00 7.6 10.1 0.033 0.010 7.2 6.16 12 40 58.37 1.26
2 53.0 0.54 0.00 8.7 10.2 0.023 0.010 10.6 3.92 14 56 66.93 1.84
4 47.6 0.00 0.00 9.0 10.2 0.040 0.003 15.3 5.36 15 78 69.78 2.63
6 41.8 0.00 0.00 9.0 10.2 0.028 0.003 19.3 5.83 16 126 73.36 3.40
8 34.0 0.64 0.00 9.5 10.1 0.018 0.003 22.3 7.82 17 130 76.50 3.86
12 28.2 0.00 0.00 9.4 10.2 0.033 0.003 29.8 5.80 18 162 79.06 5.06
24 23.0 0.90 0.00 8.3 9.8 0.005 0.003 43.1 5.22 19 336 81.17 7.42
36 17.6 0.84 0.00 8.4 10.0 0.008 0.003 66.4 5.35 20 362 82.90 10.95
48 17.6 0.00 0.00 9.3 10.1 0.010 0.003 91.6 21 404 84.22 14.77
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (mg) (%) (ppm) (mg) (%) 1. NaCN Addition : 1.31 (Kg/t)
2. NaCN Consumption : 1.22 (Kg/t)
3000.0 0.070 210 15.78 380 1140000 85.23 3. Lime Consumption : 0.53 (Kg/t)
2000.0 0.003 5 0.38 92 183200 13.70 4. Perth Tap Water Used : 1.000 (SG)
45.5 746 56.05 7265 0.54 5. Water weight to leach: 2000.0 (g)
17.6 21.0 370 27.80 404 7118 0.53 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
84.22 14.77 start of cyanidation.
Total 1331 100.00 1337584 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 0.44 446 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 0.44 / 0.50 390
* Carbon samples removed at each sampling interval.
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total
PROJECT A13575
CLIENT VISTA GOLD CORPORATION
TEST No WH 4213
MT TODD VARIABILITY COMPOSITE # 47GRIND P80 : 125 µm
WATER PERTH TAP WATER
DATE OCTOBER 2011
ADDITIONS
TIME Solids Water Carbon NaCN Lime Oxygen pH NaCN Au Cu Wt Au Cu Au Cu
(Hours) (g) (g) Haycarb (g) (g) (ppm) (%) (ppm) (ppm) (g) (g/t) (g/t) Total Total
Yao (g) (%) (%)
3000.0 2000.0 1.1 8.1
0 63.1 1.00 1.74 11.1 0.050 0.000 0.0 0.00 0 0 0.00 0.00
1 56.8 0.00 0.00 7.6 10.3 0.033 0.010 7.7 6.28 12 46 55.93 0.86
2 51.8 0.00 0.00 8.3 10.3 0.028 0.003 11.3 4.96 15 72 67.12 1.27
4 47.3 0.60 0.00 8.8 10.2 0.020 0.003 16.0 4.59 16 106 70.85 1.79
6 42.7 0.00 0.00 8.8 10.2 0.043 0.003 21.4 4.59 17 130 74.25 2.35
8 37.4 0.00 0.00 9.1 10.3 0.028 0.003 26.2 5.26 18 154 77.32 2.85
12 32.8 0.70 0.00 9.2 10.2 0.015 0.003 33.8 4.60 18 306 77.32 3.83
24 29.2 0.74 0.00 8.3 10.2 0.013 0.003 58.3 3.59 18 334 77.32 6.18
36 22.5 0.64 0.00 8.2 10.3 0.018 0.003 82.1 6.71 18 342 77.32 8.43
48 22.5 0.00 0.00 9.2 10.3 0.018 0.010 110.0 18 454 78.40 11.17
Product Quantity Assay Total Dist'n Assay Total Dist'n
(ppm) (mg) (%) (ppm) (mg) (%) 1. NaCN Addition : 1.23 (Kg/t)
2. NaCN Consumption : 1.10 (Kg/t)
3000.0 0.100 300 21.60 630 1890000 88.83 3. Lime Consumption : 0.58 (Kg/t)
2000.0 0.010 20 1.44 110 220000 10.34 4. Perth Tap Water Used : 1.000 (SG)
40.6 664 47.81 7441 0.35 5. Water weight to leach: 2000.0 (g)
22.5 18.0 405 29.16 454 10215 0.48 6. Grind Size P 80 : 125 (µm)
7. 63.1 g carbon was added to the slurry at the
78.40 11.17 start of cyanidation.
Total 1389 100.00 2127656 100.00 8. Evaporation losses made up prior to sampling at each period.
Calculated Grade 0.46 709 9. 100 g/t Pb(NO3)2 added at start of leach.
Assay Grade 0.62 / 0.60 536
* Carbon samples removed at each sampling interval.
GOLD COPPER COMMENTS :
SAMPLE
CIL CYANIDATION TIME LEACH TESTWORK : AIR SPARGE
SOLUTION DATA PREG. CARBON EXTRACTION
Solids (g)
Solution (mls)
Intermed.Carbon * (g)
Final Carbon (g)
Total Extraction
GOLD & COPPER EXTRACTION CALCULATIONS
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
EX
TR
AC
TIO
N
(%)
TIME (Hours)
RATE OF GOLD & COPPER EXTRACTION
Au-Total
Cu-Total