GJBX-1 15(81)

National Uranium Resource Evaluation

ENGINEERING REPORT ON THEMcDERMITT CALDERA DRILLING PROJECTHUMBOLDT COUNTY, NEVADA,HARNEY AND MALHEUR COUNTIES, OREGON

Bendixi Field EngineeringCorporationGrand Junction OperationsGrand Junction, CO 81502

May 1981

T O

ATESO9C

PREPARED FOR THE U.S. DEPARTMENT OF ENERGYGrand Junction Office, Colorado

BUREAU 0AN\PD M!fNTh A!I.

metadc784558

TP, HN1 L '

This report is a result of work performed by Bendix Field Engineering Corporation,Operating Contractor for the U.S. Department of Energy, as part of the National UraniumResource Evaluation. NURE is a program of the U.S. Department of Energy's GrandJunction, Colorado, Office to acquire and compile geologic and other information withwhich to assess the magnitude and distribution of uranium resources and to determineareas favorable for the occurrence of uranium in the United States.

Neither the United States Government nor any agency thereof, nor any of their employees,makes any warranty, express or implied, or assumes any legal liability or responsibility forthe accuracy, completeness, or usefulness of any information, apparatus, product, orprocess disclosed in this report, or represents that its use would not infringe privatelyowned rights. Reference therein to any specific commercial product, process, or service bytrade name, trademark, manufacturer, or otherwise, does not necessarily constitute orimply its endorsement, recommendation, or favoring by the United States Government orany agency thereof. The views and opinions of authors expressed herein do not necessarilystate or reflect those of the United States Government or any agency thereof.

GJBX-115 (81)

Engineering Report on the

McDermitt Caldera Drilling Project

Humboldt County, Nevada, Harney and Malheur Counties, Oregon

L. I. Jones, Drilling Supervisor

Bendix Field Engineering Corporation

Grand Junction OperationsP. O.' Box 1569

Grand Junction, Colorado 81502

March 1981

Prepared for the U.S. Department of EnergyGrand Junction Office, Colorado

Under Contract No. DE-AC13-76GJ01664

Contents

Page

Introduction. . ....... ..... .. . . . . . . ...... ... .

Acknowledgments . . . . . . .

Summary . . . . . . . . . . .

Principal firms and agenciesOwner . . . . . .

Operator . . . .

Land owner . . .Drilling contractor .Geophysical logging .Drilling mud services .

Logistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

Weather and road conditions . . . . . . . . . . . . . . . . . . . . . . . 9Drilling . . . . . . . .

Guidelines . . . .Work schedule . . .Assembly . . . . .

Individual hole historiesHole No. 1 . . . . .Hole No. 2 . . .Hole No. 4 . . .Hole No. 5 . . .Hole No. 5A . . .Hole No. 6 . . .Hole No. 7 . . .Hole No. 8 . . .Hole No. 9 . . .Hole No. 10 . . .Hole No. 11 . . .

5

5

5

9

10101010101010

11

11

11111111

131314161820222426282930

3

. .0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0

Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0

. ." ." ." ." ." ." ." ." ." ." ." ." ." ." ." ." ." ." ." ." ."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

."

Illustrations

Page

5Figure 1. Location map of the McDermitt caldera project area .

2. Drill-hole location map

Daily progress summary ch

Daily progress summary ch

Daily progress summary ch

Daily progress summary ch

Daily progress summary ch

Daily progress summary ch

Daily progress summary ch

Daily progress summary ch

Daily progress summary ch

Daily progress summary ch

. . . . . . . . . . . . . . . . . 7/8

art of Hole No. 1 . . . . . . . . . . 31

art of Hole No. 2 . . . . . . . . . . 32

art of Hole No. 4 . . . . . . . . . . 33

art of Hole No. 5 . . . . . . . . . 34

art of Hole No. 5A . . . . . . . . . 35

art of Hole No. 6 . . . . . . . . . 36

art of Hole No. 7 . . . . . . . . . 37

art of Hole No. 8 . . . . 38

art of Hole No. 9 . . . . . . . . . 39

art of Hole No. 10 . . . . . . . . . 40

13. Daily progress summary chart of Hole No. 11

Tables

Table 1. Drill-hole summary . . . . . . . . . - - . . . . . . . . . . .

Appendices

Appendix A. Geophysical logs (microfiche) . . . . . . . . . . . . . In pocket

4

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

. . . . . . . . . 41

6

INTRODUCTION

This report presents engineering details, statistics, individual borehole

histories, and geophysical logs of the eleven holes drilled in the McDermlitt

caldera project during the 1981 drilling program. General information ispresented regarding specific problems, including weather and logistics. A

separate geologic report is being prepared and will be available through theBendix Field Engineering Corporation Technical Library in the near future.

ACKNOWLEDGME NT S

The project geologists were F. Loomis, K. Karp, T. Carter, M. Freeman,J. Rundle of BFEC, and J. Rytuba of USGS. Drilling supervisors were L. Jonesand J. Harrison of BFEC.

LOCATION

The drill sites are located on public domain in northern Humboldt County,Nevada, southeastern Harney and southwestern Malheur counties, Oregon

(Figure 1). Boreholes were within the ring fracture zones of the Calaveracaldera, Washburn caldera, Whitehorse caldera, Jordan Meadow caldera, and the

Long Ridge caldera. Specific locations, footages, and other pertinent dataare noted in Table 1 and Figure 2.

117

O R E G O N Bsoise

1 D A H 0

42 42

McDrittCalderaComplex

Reno

N E V A D A

117F

FIGURE 1. Location map of the McDermitt caldera drilling project area.

5

TABLE 1. DRILL-HOLE SUMMARY

Hole Depth Elevation Location Topographicno. ft m ft m qtr. Sec. T. R. map*

1 245 74.68 5067 1544 NW 17 44S 35E McDermitt, Nevada

2 802 244.45 5133 1571 SE 5 41S 40E Adel, Oregon

4 676 206.04 4469 1362 SW 11 47N 37E Vya, Nevada

5 994 302.97 5544 1690 SW 32 40S 41E Jordan Valley, Oregon

5A 1500 457.20 5663 1726 SE 30 40S 41E Jordan Valley, Oregon

6 293 89.31 6623 2019 SW 36 46S 34E McDermitt, Nevada

7 736 224.33 4754 1449 NE 11 39S 37E Adel, Oregon

8 947 288.65 5671 1729 NW 32 40S 41E Jordan Valley, Oregon

9 530 161.54 5724 1745 SE 25 40S 40E Jordan Valley, Oregon

10 455 138.68 5213 1589 NE 5 41S 40E Adel, Oregon

11 241 73.46 5235 1596 NW 3 41S 40E Adel, Oregon

*U.S. Geological Survey 2 degree topographic maps

6

R33E R34E R35E R36E R37E R38E R39E R40E R41E1 -

R40E R41E R42E R43E T

36 4 S

- 95T

-G Whiteho / . T~111 1.

:,1

37

T .t Ranch - _ nT *37 _ 0S - / -

R33E R34E R35E R36E -T R36E R37N R38E R39E Z 38

S /11

T - f***IIT

39 39

4 - - - 4-

S

E-

21W

oei / 3 AIAHBOT O

T0 E E R E 4 34 40404S / 5A 8

T -. ~I 1~-2-- T

47 KIISASTER -- . ;4 47

9 95-- - - - - -I9

T T46 R h " 46N N

45 x IEAA TE 44

EXPLAIN AT0 N T

- Drill Holes N ~ - -& .

N- - < E

-- alavera caldera ring - - -fracture zone -

LOI~ ngucldrarig T ' - ~ THAC ER/PASST

fracture zone N ..' N'- -Jordan Meadow calderaI

L.L L Washburn caldera ring T 43

43 1 1 '1

fracture zone N 4

NN eac 1t N

CWhitehorse caldera ring - O - rovada

fracture zone - .-Projected ring fracture

zone R33E R34E R35E R3GE R37E R38E

5 0 5 lOMles

5 0 5 10 15 Kilometers

FIGURE 2. Drill-hole location map.

7/8

SUMMARY

This drilling project was conducted by Bendix Field Engineering Corporation(BFEC) in support of the U.S. Geological Survey - U.S. Department of Energy(DOE) National Uranium Resource Evaluation (NURE) program. This projectconsisted of eleven drill holes (see Table 1) ranging from 241 feet (73.46 m)to 1,500 feet (457.2 m). A total of 6,915.5 feet (2,107.8 m) was cored.Geophysical logging was supplied by Bendix Field Engineering Corporation. Theobjective of this project was to test the uranium potential of the calderafill sediments and to investigate areas where industry was unlikely to drillin the near future. Drilling commenced on November 13, 1980 and was completedon February 22, 1981.

9

PRINCIPAL FIRMS AND AGENCIES

Owner

U.S. Department of EnergyGrand Junction OfficeGrand Junction, CO 81502

Operator

Bendix Field Engineering CorporationGrand Junction OperationsGrand Junction, CO 81502

Land Owner

U.S. Bureau of LandWinnemucca DistrictWinnemucca, NV

U.S. Bureau of LandVale DistrictVale, OR 97918

Management

Management

Drilling Contractor

Wildcat Drilling Service, Inc.64067 W. Ranger RoadP.O. Box 48Montrose, CO 81401

Geophysical Logging

Bendix Field Engineering CorporationGrand Junction OperationsGrand Junction, CO 81502

Drilling Mud Services

Northwestern Mud CompanyBox 357Craig, CO 81625

10

LOGISTICS

The northern part (Hole #7) of this project was a three-hour drive fromMcDermitt, Nevada. Holes #2, #5, #5A, #8, #9, #10, and #11 were within22 miles west of McDermitt and Holes #1 and #6 were located in the southernpart of the project, 23 and 30 miles, respectively, west of Orovada, Nevada.

Hole #4 was located four miles west of McDermitt, Nevada.

WEATHER AND ROAD CONDITIONS

The temperatures were extremely variable, daytime from 40 to 60 degrees andnighttime from 20 to -8 degrees. Slight precipitation for the winter months

occurred, with only three inches of snow which melted in two days. Lightrains kept the surface moistened.

The major traffic artery (U.S. 95) was used for both northern and southernparts of the project. Graded county roads from U.S. 95 and cleared jeeptrails on to the sites were the accessible routes. The jeep trails would befrozen in the morning but would thaw to be slick and muddy in the afternoon.

DRILLING

GUIDELINES

The majority of the holes in this project were drilled to depths on whichthere was little available drilling information. Because of this lack of

reliable information of subsurface drilling conditions, cemented surfacecasing and blow-out preventive equipment were required on each hole. Drilling

mud was used for circulation in all holes. Earthen mud pits were constructedto contain drilling fluids.

All holes were cored from the surface or the bottom of surface casing to TD.

Hole diameter for the first 300 to 500 feet (91.44 - 152.40 m) was3.782 inches (96 mm). Drill rods would be set for casing and the holediameter reduced to 2.98 inches (75.7 mm) which continued to the total holedepth.

After completion of the holes, the drilling fluids in the pits were allowed to

evaporate and the pits were backfilled, the topsoil restored as nearly aspossible to its original contours, and the site was reseeded with grass. Theholes were plugged with mud using hole abandonment procedures.

WORK SCHEDULE

A work schedule of 24 hours in two 12-hour shifts was worked. A 15-day breakwas taken during the Christmas and New Years holidays.

ASSEMBLY

Wildcat Drilling Services, Inc. Rig No. 3

1. Diamond Drill, Inc. Model 2500, skid mounted2. Bean Royal 35 G4P mud pump3. 30-foot (9.14 m) mast with racking board4. 750 feet (228.6 m) HQ drill rods

11

5. 2,000 feet (609.60 m) NQ drill rods6. One NCB 12-898 Christensen core barrel7. One NXB 12-798 Christensen core barrel8. One International 4 x 4 Loadstar 1600 water truck, 1000 gal.

(3785 dm 3)9. One GMC pipe and winch truck

10. One White Freightliner, tilt bed and winch11. Three F-250 Ford pickups for crew changes and fuel12. One Homelite water pump, 142 GMP13. One Kohler 3.5 KVA light plant14. One Miller welder15. One parts trailer

L.A. Smith Drilling Co. (Subcontractor to Wildcat Drilling)

1. Longyear Model 44, skid mounted2. 535 multiple speed pumping unit, diesel powered3. 30-foot (9.14 m) mast with racking board4. 750 feet (228.60 m) HQ drill rods5. 2000 feet (609.60 m) NQ drill rods6. One NCB 12-898 Christensen core barrel7. One NXB 12-798 Christensen core barrel8. One GMC-4000 water truck, 1000 gal. (3785 dm 3 )9. One International L-185 water truck, 1000 gal. (3785 dm 3 )

10. One F-700 Ford cab-over flatbed pipe truck11. One Dodge-600 storage and parts truck12. One mud storage trailer13. Three pickups for crew change and fuel14. One Homelite water pump, 142 GPM15. One welder

12

Hole No. 1

Location: NW sec. 17, T. 44S., R. 35E., McDermitt, NevadaElevation: 5,067 feet (1,544 m)Total depth: 245 feet (74.68 m)Spud date: January 8, 1981Completion date: January 11, 1981Rig: DDI 2500, Rig No. 3Footage cored: 245 feet (74.68 m)Footage recovered: 231.4 feet (70.53 m)Recovery rate: 94.4 percent

Borehole history: Hole No. 1 was core drilled from the surface to a depth of45 feet (13.72 m) with a 3.782-inch (96.06 mm) core bit. A 6-inch (152 mm)rock bit was used to ream the hole to set casing. Forty-two feet (12.8 m) of4.5-inch (114 mm) casing was set and cemented. HQ core continued to a totaldepth of 245 feet (74.68 m).

Geophysical logs were run by Bendix Field Engineering Corporation with the rigstanding by until the logging was completed.

Bit Record

Size Footage Hours

Type Number in. mm ft m run

Acker 55885 3.782 96 245 74.68 36

Mud Record

Quantity Material

15 gal. (56.78 dm 3) FD-24 sks Driscose

2 sks Mud Seal10 gal. (37.85 dm 3) Diesel

7,000 gal. (26,495 dm 3) Water

Geophysical Logs

Gamma Neutron-neutron

Spontaneous potential Caliper

Resistivity TemperatureDeviation KUTResistance

13

Hole No. 2

Location: SE sec. 5, T. 41S., R. 40E., Adel, OregonElevation: 5,153 feet (1,571 m)Total depth: 802 feet (244.45 m)Spud date: December 1, 1980Completion date: December 14, 1980Rig: Longyear 44, Rig No. 2Footage cored: 788.5 feet (240.33 m)Footage recovered: 734.7 feet (223.94 m)Recovery rate: 93 percent

Borehole history: Hole No. 2 was drilled to 13.5 feet (4.11 m) with a 6-inch(152 mm) drag bit. HQ core was taken to 44 feet (13.41 m) where the hole wasreamed to 6 inches (152 mm), and 42 feet (12.8 m) of 4.5-inch (114 mm) surfacecasing was set and cemented. HQ coring continued to 470 feet (143.26 m).Circulation was lost at 404 feet (123.14 m) and not regained for the remainderof the hole. The geophysical logs were run by Bendix Field EngineeringCorporation. The HQ drill rods were set at 470 feet (143.26 m), and coringwas completed to 802 feet (244.45 m) with an NQ-size core bit.

Bit Record

Type

Drag bit

Christensen

Christensen

Lamage

Christensen

Christensen

Number

OS-37144

OS-42219

S-9510

OS-30253

OS-30945

in.

6

3.782

3.782

2.98

2.98

2.98

Size Footagemm

152

96

96

75.7

75.7

75.7

ft

13.5

349.5

107

230

44

58

mHoursrun

4.11

106.53

32.61

70.10

13.41

17.68

3

57.5

16.5

28.5

7

7

Mud Record

Quantity

lbsgals. (254.95 dm 3)gal. (18.93 dm 3)sks

lbslbsgal. (49,205 dm 3 )sks

Material

Drill TrolPoly DrillPQ 460Mud SealDriscossDrispackWaterCement

14

4270

5266

13,0008

Geophysical Logs

GammaSpontaneous potentialResistanceDeviation

Neutron-neutron

Temperature

15

Hole No. 4

Location: SW sec. 11, T. 47N., R. 37E., Vya, NevadaElevation: 4,469 feet (1,362 m)Total depth: 676 feet (206.04 m)Spud date: January 12, 1981Completion date: January 24, 1981Rig: DDI 2500, Rig No. 3Footage cored: 387 feet (117.96 m)Footage recovered: 364.5 feet (111.10 m)Recovery rate: 94.2 percent

Borehole(152 mm)cemented281 feetdrilling676 feet

history: Alluvial fill was encountered in Hole No. 4, and a 6-inchrock bit was used to a depth of 289 feet (88.11 m). The hole wasat seven different depths to prevent sidewall caving. A total of(85.65 m) of 4.5-inch (114 mm) casing was set and cemented, andcontinued with a 3.782-inch (96 mm) core bit to a total depth of(206.04 m).

Geophysical logging was accomplished by Bendixwith the rig standing by until the logging was

Bit Record

Type Number

Grunner Used button bit

Acker 55885

in.Size

mm

1526

3.782

ft

289

38796

Field Engineering Corporationcompleted.

Footagem

88.11

117.96

Hoursrun

79

54.25

Mud Record

(143.8 dm3 )

(37.81 dm 3 )

(227 dm 3 )

(181,680 dm 3)

DriscoseCementCalcium chlorideDieselFD-2Cal SealSoda ashSodium bicarbonate120 LKwik SealPotashWater

16

Quantity Material

16522

38103413

601

1548,000

sksskssksgal.gal.skssksksgal.sk

sksgal.

Geophysical Logs

GammaSpontaneous potentialResistanceDeviationKUT

Neutron-neutronResistivityCaliperTemperature

17

Hole No. 5

Location: SW sec. 32, T. 40S., R. 41E., Jordan Valley, OregonElevation: 5,544 feet (1,690 m)Total depth: 994 feet (302.97 m)Spud date: November 13, 1981Completion date: November 25, 1981Rig: DDI 2500, Rig No. 3Footage cored: 947 feet (288.65 m)Footage recovered: 921.2 feet (280.78 m)Recovery rate: 97 percent

Borehole history: Hole No. 5 was drilled to 47 feet (14.33 m) with a 6-inch(152 mm) button bit. Forty-two feet (12.8 m) of 4.5-inch (114 mm) casing wasset and cemented. HQ core was taken from 47 feet (14.33 m) to 554 feet(168.86 m). The HQ drill rods were set for casing, and coring continued withan NQ-size core bit to a total depth of 994 feet (302.97 m). Hole abandonmentmud was mixed. The geophysical logs were run by Bendix Field EngineeringCorporation.

Bit Record

Type Number

Grunner

Christensen

Christensen

Christensen

Christensen

Christensen

Acke r

Acker

Acker

Christensen

in.

Button bit

OS-24994

OS-41213

OS-37142

OS-37115

OS-41806

S-60009

S-60010

S-560011

OS-37203

Size

6

3.782

3.782

3.782

3.782

2.98

2.98

2.98

2.98

2.98

mm

152

ft

47

Footage

96 Reamer

96

96

96

6

389

112

75.7 Reamer

75.7

75.7

75.7

75.7

13

88

99

240

18

m

14.33

1.83

118.57

34.14

Hoursrun

6

2.25

3.25

67.25

28.5

1

5.75

11

16

36

3.96

26.82

30.18

73.15

Mud Record

Quantity

(94.63 dm 3 )

(253.60 dm 3)

(18.93 dm3

(79,485 dm )

Material

PotashDriscose HVF-D2PQ460DieselCement1200-LWater

Geophysical Logs

GammaSpontaneous potentialResistanceCaliperTemperature

Neutron-neutronKUTResistivityDeviation

19

67

25106785

21,000

skssksgals.lbsgals.sksgals.gals.

Hole No. 5A

Location: SE sec. 30, T. 40S., R. 41E., Jordan Valley, OregonElevation: 5,663 feet (1,726 m)Total depth: 1,500 feet (457.2 m)Spud date: December 16, 1980Completion date: February 22, 1981Rig: Longyear 44, Rig No. 2 and DDI 2500, Rig No. 3Footage cored: 1,476 feet (449.88 m)Footage recovered: 1,391.2 feet (424.04 m)Recovery rate: 94.3 percent

Borehole history: A 6-inch (152 mm) bit was used to drill the overburden to24 feet (7.32 m), and 21 feet of 4.5-inch (114 mm) surface casing was set andcemented. The cement was allowed to set, and the cement plug was drilled out

of the casing. Coring commenced at 24 feet (7.32 m) with a 3.782-inch (96 mm)core bit. This size of core was taken to a depth of 299 feet (91.14 m) wherethe HQ casing was set, hole size was reduced to 2.98 inches (75.7 mm), andcoring continued to 916 feet (279.2 m). The hole was logged at this depth,and the rig moved off on January 12, 1981.

It was decided to deepen this hole and Wildcat Drilling Rig No. 3 moved overthe hole on February 16, 1981. HQ casing was set to 300 feet (91.44 m), and2.98-inch (75.7 mm) core was taken to a total depth of 1,500 feet (457.2 m).Circulation was lost at 1,151 feet (350.82 m). Lost circulation material waspumped down the hole but no return of circulation was encountered. There wasno problem with the loss of circulation.

Geophysical logs were run by Bendix Field Engineering Corporation. When theprobe was run in the hole, a bridge was hit at 960 feet (292.61 m) but theprobe was able to penetrate the bridge. Another bridge was hit at 1,066 feet(324.92 m) and the probe was pulled from the hole. Drill pipe was run backinto the hole to clean the hole. The drill pipe was set at 1,495 feet

(455.68 m), and the logs were run with the drill string in the hole.

Bit Record

Size Footage HoursType Number in. mm ft m run

Drag bit Used 6 152 24 5

Christensen Imp. OS-42219 3.782 96 275 7.32 24.5

Christensen Imp. OS-30946 2.98 75.7 325 99.06 31.5

Lamage S-7068 2.98 75.7 44 13.41 6.5

Lamage S-2070 2.98 75.7 133 40.54 27.5

Christensen OS-37988 2.98 75.7 49 14.94 14.5

20

Type

Lamage

Christensen

Christensen

Number

S-2069

OS-371436

OS-37206

Bit Record (continued)

Sizein.

2.98

2.98

2.98

mm

75.7

75.7

75.7

ft

66

390

185

Footagem

20.12

118.87

56.39

Mud Record

Quantity

20 gals. (75.7 dm 3 )8 sks10 gals. (37.9 dm 3)1 sk1 sk4 sks

Material

Poly DrillDriscoseMarfaxPQ460Mud SealCement

Geophysical Logs

Gamma Neutron-neutronSpontaneous potential Resistivity

21

Hoursrun

15

76.5

39

Hole No. 6

Location: SW sec. 36, T. 46S., R. 34E., McDermitt, NevadaElevation: 6,623 feet (2,019 m)Total depth: 293 feet (89.31 m)Spud date: January 15, 1981Completion date: January 22, 1981Rig: Longyear 44, Rig No. 2Footage cored: 230 feet (70.1 m)Footage recovered: 200.4 feet (61.08 m)Recovery rate: 87.1 percent

Borehole history: A 6-inch (152 mm) drag bit was used to drill the overburdento a depth of 63 feet (19.2 m), and 63 feet (19.2 m) of 4.5-inch (114 mm)casing was set and cemented. Coring began at the bottom of the casing with a

3.782-inch (96 mm) core bit. At 174.5 feet (53.19 m), circulation was lostand 41.5 hours were spent pumping lost circulation material down the holeregaining 50 percent of the circulation. HQ casing was set at 200 feet(60.96 m), and the hole size was reduced to 2.98 inches (75.7 mm). Coringcontinued with this size to a total depth of 293 feet (89.31 m).

The geophysical logging was performed by Bendix Field Engineering Corporation.

Bit Record

Type

Drag bit

Lamage

Lamage

Christensen

Christensen

Number

S-3417

S-3118

OS-4222914

OS-1787M

Mud Record

(94.63 dm 3 )

(37.81 dm 3)(37.81 dm 3)

(75.7 dm 3)(94,625 dm 3)

Poly DrillDicks Mud SealCal SealPQ 460MarfaxBranKwik SealPetro SealDriscoseDieselWater

22

Sizein.

Footagem

Hoursrun

6

3.782

3.782

3.782

2.98

mm

152

96

96

96

75.7

ft

63

111

9

17

93

19.2

33.83

2.74

5.18

28.04

13

13

1

2

13.5

Quantity Material

2536

1010541320

25,000

gal.sks

sksgal.gal.sksskssksks

gal.gal.

Geophysical Logs

GammaResistanceSpontaneous potentialTemperatureCaliper

Neutron-neutronDeviationResistivityKUT

23

Hole No. 7

Location: NE sec. 11, T. 39S., R. 37E., Adel, OregonElevation: 4,754 feet (1,449 m)Total depth: 736 feet (224.33 m)Spud date: November 28, 1980Completion date: January 6, 1981Rig: DDI 2500, Rig No. 3Footage cored: 690 feet (210.31 m)Footage recovered: 558.5 feet (170.23 m)Recovery rate: 81 percent

Borehole history: Hole No. 7 was spudded with a 3.782-inch (96 mm) core bitand drilled to 45 feet (13.72 m). The hole was reamed out with a 6-inch(152 mm) rock bit, and 42 feet (12.8 m) of 4.5-inch (114 mm) casing was setand cemented. Coring continued to a depth of 231 feet (70.41 m) where thesidewalls started collapsing. The hole was then cemented back to the bottomof the casing. The cement was drilled out, and a 3.782-inch (96 mm) core bitwas run to a depth of 556 feet (169.47 m). HQ casing was set to 556 feet(169.47 m), and coring continued with a 2.98-inch (75.7 mm) core bit to atotal depth of 736 feet (224.33 m). Electric logs were run by Bendix FieldEngineering Corporation with 556 feet (169.47 m) of casing in the hole.

The 556 feet (169.47 m) of casing could not be pulled and was cut at 436 feet(132.89 m), leaving 120 feet (36.58 m) in the hole. After casing was pulled,the hole was logged again by Bendix Field Engineering Corporation.

Bit Record

Size Footage HoursType Number in. mm ft m run

Christensen 25 OS-37115 3.782 96 56 17.07 8

Christensen 25 OS-41213 3.782 96 240 73.15 24.25

Christensen Imp. Reamer 3.782 96 52 15.85 14.75

Christensen Imp. OS-37141S 3.782 96 208 63.4 27.50

Christensen Imp. OS-37202S 2.98 75.7 139 42.37 17.75

Christensen Imp. OS-37990 2.98 75.7 41 12.4 9

24

Mud Record

Quantity

(586.7 dm 3)(189.3 dm3)

(223,315 dm3)

Material

DieselFD-2DriscoseKwik SealDicks Mud SealSoda ashCalcium chlorideCementWater

Geophysical Logs

GammaResistivitySpontaneousDeviation

potential

Neutron-neutronKUTTemperatureCaliper

25

15550126611

3559,000

gal.gal.skssksskssksksksgal.

Hole No. 8

Location: NW sec. 32, T. 405., R. 41E., Jordan Valley, OregonElevation: 5,671 feet (1,729 m)Total depth: 947 feet (288.65 m)Spud date: February 2, 1981Completion date: February 13, 1981Rig: Longyear 44, Rig No. 2Footage cored: 926 feet (282.24 m)Footage recovered: 883.1 feet (269.17 m)Recovery rate: 96 percent

Borehole history: The overburden was drilled to 21 feet (6.4 m) with a 6-inch(152 mm) drag bit. A 3.782-inch (96 mm) core bit was used from 21 feet(6.4 m) to a depth of 457 feet (139.29 m) where circulation was lost. HQcasing was set, circulation was recovered, and hole size was reduced to 2.95inches (75.7 m). Coring continued to a total depth of 947 feet (288.65 m).Geophysical logsCorporation.

were successfully run by Bendix Field Engineering

Bit Record

Type Number

Drag bit Used

in.Size

6

mm

152

ft

21

Footagem

Hoursrun

6.4 2.5

Christensen Imp.

Christensen Imp.

Christensen Imp.

Christensen Imp.

Lamage Imp.

Longyear Imp.

Lamage Imp.

S-42229 3.782

OS-45883

OS-45884

OS-45885

3.782

3.782

3.782

S-2072 3.032

Le-15399 2.98

S-2071 2.98

Mud Record

gal. (189.3 dm 3)sks

sksgal.sks

gal. (56.78 dm 3)sks

Poly DrillSoda ashDicks Mud SealPQ460DriscoseMar faxKwik Seal

26

96

96

96

96

77

75.7

75.7

232

112

55

37

188

184

118

70.71

34.14

16.76

11.28

57.30

56.08

35.97

30

15

5.5

7

22

21. 5

16

Quantity Material

502252

153

Geophysical Logs

GammaResistivitySpontaneous potentialDeviation

Neutron-neutron

KUTTemperatureCaliper

27

Hole No. 9

Location: SE sec. 25, T. 40S., R. 40E., Jordan Valley, OregonElevation: 5,724 feet (1,745 m)Total depth: 530 feet (161.54 m)Spud date: February 11, 1981Completion date: February 14, 1981Rig: DDI 2500, Rig No. 3Footage cored: 530 feet (161.54 m)Footage recovered: 500.9 feet (152.67 m)Recovery rate: 94.5 percent

Borehole history: Hole No. 9 was spudded in with a 3.782-inch (96 mm) corebit, and 30 feet (9.14 m) was reamed to 6 inches (152 mm). Thirty feet(9.14 m) of casing was set. Coring continued to a total depth of 530 feet(161.54 m). Geophysical logs were taken by Bendix Field EngineeringCorporation.

Bit RecordSize Footage Hours

Type Number in. mm ft m run

Christensen OS-371436 3.782 96 530 161.54 66.5

Mud Record

Quantity Material

4 sks Driscose20 gal. (75.7 dm 3 ) 120L

Geophysical Logs

Gamma Neutron-neutronResistivity KUTSpontaneous potential TemperatureDeviation Caliper

28

Hole No. 10

Location: NE sec. 5, T. 415., R. 40E., Adel, OregonElevation: 5,213 feet (1,589 m)Total depth: 455 feet (138.68 m)Spud date: February 3, 1981Completion date: February 7, 1981Rig: DDI 2500, Rig No. 3Footage cored: 455 feet (138.68 m)Footage recovered: 432.5 feet (131.83 m)Recovery rate: 95 percent

Borehole history: Hole No. 10 was spudded in with a 3.782-inch (96 mm) reamercore bit to 10 feet (3.05 m). At 10 feet (3.05 m) the hole was reamed to asize of 6 inches (152 mm), and 10 feet of 4.5-inch (114.3 mm) casing was set.Coring continued from the bottom of the casing with a 3.782-inch (96 mm) corebit. At 102 feet (31.09 m), circulation was lost. Lost circulation materialwas pumped into the hole without recovery of the circulation. The hole wascored to a total depth of 455 feet (138.6 m) without circulation and noproblems were encountered.

Bendix Field Engineering Corporation successfully completed the geophysicallogging, the 10 feet (3.05 m) of surface casing was recovered, and the rigmoved off the location.

Bit Record

SizeType

Christensen Reamer

Grunner Button

Christensen Imp.

Christensen Imp.

Number

OS-46325

Used

OS-371436

in.

3.782

6

mmFootage

ft

96 10

152

3.782

3.782

10

96 370

Hoursm run

3.05

3.05

112.78 50.5

96 75 22.86 15

Mud Record

Quantity

(189.3 dm 3)

(143,830 dm 3 )

Geophysical Logs

GammaResistivitySpontaneousDeviation

potential

Neutron-neutronKUTTemperatureCaliper

29

1

2.5

105013

38,000

sksgal.sk

sksgal.

Material

Driscose120LMud SealKwik SealWater

Hole No. 11

Location: NW sec. 3, T. 415., R. 40E., Adel, OregonElevation: 5,235 feet (1,596 m)Total depth: 241 feet (73.46 m)Spud date: February 8, 1981Completion date: February 10, 1981Rig: DDI 2500, Rig No. 3Footage cored: 241 feet (73.46 m)Footage recovered: 230 feet (70.10 m)Recovery rate: 95.4 percent

Borehole history: Hole No. 11 was spudded in with a 3.782-inch (96 mm) corebit, and 20 feet (6.1 m) of surface casing was set. Coring continued with a3.782-inch (96 mm) core bit to a total depth of 241 feet (73.46 m).Circulation was lost in the top 50 feet (15.24 m), but no problems wereencountered. Geophysical logs were taken by Bendix Field EngineeringCorporation.

Bit Record

SizeType Number

Christensen OS-371436

in.

3.782

mm

96

ft

241

Footagem

73.46

Mud Record

Quantity

skgal. (56.8 dm 3)sk

Material

Driscose120LSuper Gel

Geophysical Logs

GammaResistivitySpontaneous potentialDeviation

Neutron-neutron

KUTTemperatureCaliper

30

Hoursrun

33.75

1151

Wildcat Drilling Rig No. 3 DD-2500 Hole No. IJanuary 1981

8 9 10 II0 3 -0

Bit No. I Christensen impregnated 3.782 in. (96mm)

45 ---- Bit No. 2 Acker 3.782 in. ( 96mm) 1~.-155 -16.76

100 -- 30.48

(0

195 -59.43? 200- -60.96 Z

z =F- ~-IL a.0 W

245 TD 245 ft. -74.67(74.67m)

300 -91.44

I I I2 3 4 5

DAYS ON HOLE

31

L.A. Smith Drilling Rig No. 2 Longyear 44 Hole No.2December 1980

30 1 2 3 4 5 6 7 8 9 10 II 12 13 140 0II I I I

Drug bit 6 in. ( 152 mm)Waiting for cement to dry

44-Bit No. I Christensen impregnated 3.782 in. ( 96 mm) 13.41

100 -30.48

164 49.98

200 -60.96

234 71.32

300 - -91.44

363 Bit No. 2 Christensen impregnated 3.782 in. (96mm) -110.64

400- -121.92421 -128.32

HQ Casing set 470 ft. ( 143.26m)W 47--Bit No. 3 Lamage impregnated 2.98 in. 143.25 W

z 5007. -m) 152 .40 X

500Pump broke downd.. 551 167.94 -w a.o w

0

600 -182.88

663 -202.08

Bit No.4 Christensen700 impregnated 2.98 in. -213.36

(75.7mm)734 223.72

Bit No. 5 Christensen impregnated2.98 in. (75.7 mm) Logging hole

800 243.84802 244.44

T D 802 ft. ( 244.44 m)

900 -274.36

I 2 3 4 5 6 7 8 9 10 Il 12 13 14 15DAYS ON HOLE

32

Wildcat Drilling Rig No. 3 DDI-2500 Hole No. 4January 1981

II 12 13 14 15 16 17 18 19 20 21 22 23 24

Rotary drilled-0 to 288 ft. (87.78m)33~6 In. (152mm) rock bit -0.05

95 - ..--28.34

100 3048103 31.39

123 -37.49133 40.53

173 52.73

200 -60.96

223 67.97

263 -80.16

286 Started coring _87.78300- Bit No. I Ackor 3.782 in. -91.44

(96 mm)

Un

F- wJW HJI. 374 113.99

Z 400 121.92 Z

M a

D G

500 -152.40

533 -162.45

600 -182.88

642 - 195.68

676 TD 676 ft. -206.04

700 (206.04m) 213.36

I 2 3 4 5 6 7 8 9 10 II 12 13 14DAYS ON HOLE

33

Wildcat Drilling Rig No. 3 DDI-2500 Hole No.5November 1980

12 13 14 15 16 17 18 19 20 21 22 23 240 ' ' - ' ' ' ' ' ' ' 0

Grunner Button Bit 6in. (152 mm)

47 Bit No. I Christensen MR 25 3.782 in. (96 mm) -14.32Waiting for Bit No. 2 Christensen impregnated 3.782 in.( 96mm)

75 -- cement to dry--22.86

100 -- 30.48

165 50.29

200 -60.96

300 -91.44

400 -- 121.92442-Bit No. 3 Christensen impregnated -134.72

3.782 in. (96 mm)W WW

Z 500152.40z- 505 53.92

Set HQ casing at 553ft.a. (168.55m)567--Bit No. 4 Ackor Step crown 172.82

Bit No.5 Arkor step crown600-2.98 in. (75.7mm) -182.88

673-Bit No. 6 Ackor step crown 205.13700 -- ~2.98 in. ( 75.7 m m) -23700 213.36

759-Bit No. 7 Cristensen impregnated 231.342.98in.(75.7 mm)

800 -243.84

900 -274.32918 -279.80

TD 994 ft.994-(302.97m) 302.971000- -304.80

I 2 3 4 5 6 7 8 9 10 II 12 13DAYS ON HOLE

L.A. Sm

0'

44

100

200208

299300

400 -

500

574S00624

684700

I-WWIL

Z 800

I-

1000-

1052

1100

1173

1200

1391 ~1400

1500-

ith

17

Drilling Rig No.2 Longyear 44December 1980 January 1981

19 21 23 25 27 29 31 1 2 3 4 5 6 8 10

Hole No. 5A

Dragbit 61n. (152mm)Bit No. I Christensen impregnated 3.782 in (96mm)

Bit No. 2 Christensen impregnated 2.98 in. ( 75.7 mm)

Break period 15 days

Bit No. 3 Lamage impregnated2.98 in. (75.7mm)

Bit No.4 Lamage impregnated2.98 in. (75.7 mm)

Wildcat Drilling No. 3 DDI-2500 Bit No. 5 ChristensenFebruary 1981 2.98 in.(75.7mm)16 18 20 22

- I I I I I II

Bit No.6 Lamage2.98in.(75.7mm)Bit No. I Christensen impregnated

2.98 in. (75.7 mm)Hole was deepened by

Wildcat Drilling Rig 3-Feb. 1981

Bit No. 2 Christensen impregnated 2.98 in.( 75.7mm)

Logging hole

T D 1500 ft.( 457.20m)

300A

I 2 3 4 5 6 8 10 12 14 16 18 20 22 24 26

1 2 3 4 5 67 8DAYS ON HOLE

35

-30.48

,60.9663.39

-91.44

-121.92

-152.40

-174.96-182.88-190.19

-208.48 Co-213.36 :

2

*243.84 z2244.14-z252.37

-,274.32 w

-304.80

- 320.65

-335.28

-357.53-365.76

-396.24~397.76

423.98-426.72

-457.20

-487.68

.. .. n

Ivw

L.A. Smith Drilling Rig No. 2 Longyear 44 Hole No. 6January 1981

14 15 16 17 18 19 20 21 22

0- 0

Drag bit 6 in. ( 152 mm)

Setting and cementing casing

64---- Bit No. I Lamage impregnated 3.782 in.(96 mm)-19.51

100 -30.48

ww ww

z2z

w Bit No. 2 Lamage impregnated 3.782 in.( 96 mm)o 175 53.34 w

183 Bit No. 3 Christensen impregnated 55.783.782 in. (96 mm)

200 Bit No.4 Christensen impregnated -60.96210 2.98in.(75.7mm) 64.01215 -65.53

259 -78.94

TD 293 ft.293 89.3m) 89.31300 91.44

2 3 4 5 6 7 8 9DAYS ON HOLE

36

Wildcat Drilling Rig No. 3 DD 1-2500Nov. 1980 December 1980

28 301 2 3 4 5 7 9 11 13 15 17 19 21 23 25 27 20 I I1 _ 1 1 l I1I1I1I1I1I1I1 1 1 Il I1 I1 I1 I1 I1 I1 1I 1I 1I 1I 1I 1I 1I 1I

45 --

156 -

200

226-231236

354---

400-z

I

500 =504

536 -

556 -

576-

600 -

695700=

736 -

Ho

9

Pump broke downBit No. 2 Christensen MR 25 3.782 in.( 96 mm)

Cementing hole

Bit No. 3 Christensen impregnated 3.782 in.(96 mm)

Bit No. 4 Christensen impregnated3.782 in.(96 mm)

Bit No. 5 Christensen impregnated2.98 in. (75.7mm)

Dec. I 2 3 4 579 8 Bit No. 6 Christensen impregnated31 1 2 3 4 6 7 8 2.98 in.(75.7mm)

XMAS Loggi g hole.period( Logging hole (XMAS break period

TD 736 ft.( 224.33 m)

le No. 7

-0

13.71

30.48

47.54

60.96

68.8870.4071.93

90.2291.44

107.89

I-

21.8

121.92

I

152.40153.61

163.98

16946

175.56

182.88

211.83213.36

224.33

.84

37

800 S2431 2 3 4 5 7 91I 13 15 17 19 21 23 25 27 29 31 33

J Il I II I I I

35 37 39 41 43DAYS ON HOLE

w -W

T %P

Drilling Rig No.2 Longyear 44February 1981

2 3 4 5 6 7 8 9 10 II 12 13 141 - 1 4 - 1 1I 1I 1 1I 1I 1I 1

73

100--

200

253

300

333

400

w 433

z500

5120-w

600

645

700

800822

900

943947

1000-

DAY2 3 4 5 6 7

AYS ON HOLE

8 9 10 II 12 13 14

Hole No. 8L.A. Smith

v-Drag bit 6in.(152mm)

Bit No. I Christensen impregnated 3.78 in. ( 96mm)

Bit No. 2 Christensen impregnated 3.782 in. (96 mm )

Bit No. 3 Christensen impregnated 3.782 in. (96 mm)

Bit No.4 Christensen impregnated 3.782 in. (96 mm)

Bit No. 5 Lamage impregnated 2.98 in.( 75.7 mm)

Bit No. 6 Lamage impregnated 2.98 in. (75.7mm

Bit No. 7 Lamage impregnated 2.98 in.(75.7 mm)

Rig broke downLogging hole

TD 947 ft. (288.64 m)

22.25

30.48

60.96

-77.11

91.44

101.49

121.92 g,c:w

131.97 W

z152.40 =

156.05 pa-w0

82.88

196.59

213.36

-243.84250.54

-274.32

-287.42288.64

-304.80

I)

II

v1

Wildcat Drilling Rig No. 3 DDI-2500 Hole No.9February 1981

10 1 12 13 14

Bit No. I Christensen impregnated 3.782 in. (96 mm)

53 16.15

100 -30.48

200 60.96

I- 265 0.77 IWi W

300 -91.44 z

x _I- ~-

w w1

400 121.92

463 -141.12

500- -152.40TD 530 ft.

53 (161.54m) -161.54

600 182.88

2 3 4DAYS ON HOLE

39

Wildcat Drilling Rig No. 3 DDI-2500

2

35

100-

195200-ww

LL

Z

a4-w

335

400-

428

455

500--

3 4

Hole No. 10February 1981

51

6 7

Bit No. I Christensen 3.782 in. ( 96 mm)

Bit No. 2 ChristensenImpregnated 3.78 in.

(96 mm)

TD 455 ft(138.68m)

I 2DAYS ON HOLE

10.67

-30.48

59.44 c/)-60.96 W

z

I-

-91.44 w

-102.11

-121.92

- 130.45

-138.68

-152.40

4 1 6

40

u i nI I nn L , I

I

3

Wildcat Drilling Rig No. 3 DD I-2500 Hole No.I1February 1981

7 8 9 100 0

Bit No. I Christensen impregnated 3.782 in. ( 96 mm)

20 - 6.10

100 -30.48

,,

I- wW I-

1i6 ---- 47.24 2

z z

a. a.o G

200 -60.96

241 TD 241 ft. (73.46m) 7346

300 -91.44

2 3 4DAYS ON HOLE

41