HITEBIRCH LAKE PROJECTS SECTION - Ontario · 2017. 1. 17. · 52h13se8024 3.974 whitebirch lake 010...
Transcript of HITEBIRCH LAKE PROJECTS SECTION - Ontario · 2017. 1. 17. · 52h13se8024 3.974 whitebirch lake 010...
-
52H13SE8024 3 .974 WHITEBIRCH LAKE 010
REPORT ON AN
AIRBORNE GEOPHYSICAL SURVEY (ELECTROMAGNETIC)
IN THE
TOMMYHOW LAKE AREA
OF WESTERN ONTARIO
FOR
LABRADOR EXPLORATION (Ontario) LIMITED
CONDUCTED BY
GEOTERREX LIMITED
PROJECT 84-103
PROJECTS SECTION
OTTAWA, Ontario,
June, 1972.
P. Norgaard, P.Eng., Reva Dowse, B.A., Don McQueen, M.Se./ GEOPHYSICISTS
opoterrex
-
1.
On May 13, 1972 Geoterrex Limited carried out an airborne
geophysical survey (combined electromagnetic^ rfldLojnetric and
magnetic) in the Tommyhow Lake area of Western Ontario for
Labrador Exploration (Ontario) Limited.
An Otter aircraft, with Canadian registration CF-AYR was
used throughout the survey, and it was equipped with an Jn-Phase/
Out-of-Phase electromagrietic^sysj^ejn operating at 3201^ a
iifi-rjLprmance proton resonance magnetometjejEL, a DGRS 1000
gornnia Roy spectrometer and associated survey equipment. (See
Appendix B for detailed description of equipment/ compilation
procedures and method of control),
The survey block is centred around Lot. 49 50N and Long.
89 45 W. Lines were fLowrLJJ-20 W with Y8 mile spacing and also
E-W at intervals of j mile. A total QJLJJLLJUjTe^miJLes was
compiled c.overing. the c l a .vnL^flJiQjj D out cf a total of 260 miles
flown.
The purpose of the survey was to detect bedrock conductors
which might reflect the presence of base metal sulphides/ and
to suggest recommendations for a further exploration program by
evaluating prospective conductive zones from a geophysical point
of view.
Dioterrex
-
2.
All detected electromagnetic responses are individually
listed by line number and letter designation in Appendix A
and plotted on a photo transparency map at a scale of l inch s
1/320 feet. The intensity of the anomaly is shown, along with
the flying altitude and any magnetic association.
Prospective conductive zones are outlined and numbered/
and discussed in detail in Section V.
For discussion of radiometric and magnetic results/ see
separate reports.
geoterrex
-
3.
II. PERSONNEL
The personnel involved in this survey include the
following:
A. Fi eld Op e r a t i on
Pilot
Navigator
Operators
A. Bratteng, Ottawa
R. Bolivar, Ottawa
B. Hind, OttawaS. Harrison, OttawaB. Kramer, Ottawa
Data Compilers C. Taggart, OttawaL. Matthews, Ottawa
Aircroft Engineer L. Fougere, Ottawa
Geophysicist D. McQueen, Ottawa.
B. O f f i c e C o tnp i l a j i on
Data D. Sarazin, Ottawa
Drafting M. Dostaler, Ottawa
Geophysics R. Dowse, OttawaD. Wagg, ManotickD. McQueen, Ottawa
geoterrex
-
t
Q III. CLAIMS COVERED - 173
251859
2628 95*
263124
287709
288279
288301
288552
288803
302543
304322
309216
335996
A 336022
~ 262904
- 263133
- 287728
- 288292
- 288314
- 238553
- 288822
- 302551
- 304333
- 309276
- 335999
~ 33602*
4.
*
Mileage within claims - 151 ' Total mileage - 260
incl.
incl.
incl.
incl.
incl.
incl.
incl.
incl.
incl.
incl ,
incl. ( ;- - These claims were staked since the
incl. ) surveys.were perf ormed-12 dlaimastaked May 19,Airborne geophysical oertifioatebeing applied for.
3 2,'
32.
i*u
OROterre
-
5.
IV. GENERAL
A. Geology
Reference: Ontario Dept. of Mines and Northern Affairs,
Map 2199.
geoterrex
-
6.
B
Five conductive zones have been identified and mapped
in the survey area as well as a few isolated, single line
responses. The zones have been evaluated obiectiveJLy^-QiLJL
of a maximum of 100 points by assigning a predetermined
numerical value to relevant geophysical criteria such as
intensity, apparent conductivity, magnetic association, relative
isolation, strike length, etc. (See Appendix C for rating
system). A final subjective evaluation based on - 15 points
is included in some cases when anomaly character seems particularly
significant. The total rating is then used to group the
zone into a general category which may facilitate the planning
of the followup programme to some extent.
The ratings are more or less grouped as follows:
Rating 65 - 100 - Category A
Rating 40 ~ 64 - Category B
Rating less than 40 - Category C
Category A includes zones recommended for followup
on a high priority basis. These indicate probable bedrock
sources with good to excellent potential for sulphide
mineralization. Conductors in Category B have probable fair
potential and would be investigated in any relatively
complete followup program. The final grouu, Category C, is
comprised of doubtful bedrock zones (including probable
surficial and probable cultural sources), or those weaker
ggoterrex
-
7.
zones which would not normally merit further consideration
unless local geology was favourable. Conductors classified
as B~ are also rather inconclusive geophysical prospects.
Individual anomalies not grouped into zones are
also discussed and followup is recommended according to
merit.
geoterrex
-
8,
V. DISCUSSION OF CONDUCTIVE ZONES
Zon^JT-l Anomalies 26-B through 29-A Rating 50Category B
These EM anomalies are quite well developed with fair to
good intensities. They reflect a highly conductive source
material probably of magnetic origin (120-300 gammas), and
both the EM and directly associated magnetic response
exhibits some variability of interest. The zone could possibly
relate to some easterly striking structural feature, and
investigation is recommended near anomaly 29-C, which faintly
suggests dual character, or possibly near anomaly 27-C,
Although this latter response is partially obscured by an equip
ment check (normal procedure at the end of a flight line), it
seems to reflect, rather good EM character as well as slightly
enhanced intensity.
In view of the undetermined strike length, a medium priority
rating seems advisable.
Zone ̂ -2 Anomalies 56-A through 13-A Rating 60Category B
This zone lies on the same horizon as zone T-3,
suggecting sporadic development along some easterly trending
structural feature and possibly some common origin. The EM
response ranges in intensity from weak to very good with
geoterrex
-
9.
excellent conductivity reflected throughout/ and the directly
coincident magnetic anomalies are also reasonably encouraging
(100-960 fi ) , particularly in the western section in the
vicinity of the strongest response, anomaly 5-A. Some
enhancement could be reflected in this area, and further
work might be considered with medium or medium to high priority,
Zone T-3 Anomalies 21-A through 28-A Rating 52Category B
This conductive zone is quite comparable geophysically
to zone T-2. The same range of intensities is indicated (fair
to very good), and the same consistently high conductivity is
apparent. Direct magnetic correlations are also indicated for the
most part, although some significant offsetting seems to be
suggested to the east (lines 25 and 27). The magnetic zone
ranges in amplitude from 50 - 400 gammas, but the apparent
variability is only slight and not really impressive. Investi
gation seems warranted with medium priority, and further work
could be centred near anomalies 23-A and/or 25-B, The former
was selected on the basis of enhanced amplitude accompanied
by good magnetic association (direct 400 gammas), while the latter
suggests some width enhancement, possibly in the proximity of
a cross-cutting structural phenomena.
OROterrex
-
10.
Zone T-4 Anomalies 51-A, 52-A and 53-A Rating 42Category B
Anomalies 51-A and 52-A are very weak, poorly defined
responses with little apparent potential, but on the basis
of anomaly 53-A some further work is definitely warranted.
This is a very favorable looking EM anomaly with very good
intensity lying slightly offset from a prominent magnetic
marker (1300 gammas). A source material with excellent apparent
conductivity seems to be indicated and further work to
determine the full strike length is recommended with medium
priority.
Zone T 5 Anomalies 54-B and 55-A Rating 41
This conductive zone begins at the end of the survey
grid and again interpretation is quite hampered by the
unknown strike length. The anomalies exhibit only fair intensity
but seem to relate in some way to a deeper looking magnetic
marker of 100 gammas. The apparent conductivity is excellent
and followup is suggested with low to medium priority. Slight
preference is given to anomaly 54-B which seems to exhibit
slightly better resolution.
geoterrex
-
11,
tAdditional Anomalies
; In addition to the zones discussed above a few single-
line and very weak, inconclusive EM responses were also
identified. These are briefly discussed below and may warrant
some consideration if local geology is encouraging.
AnojKily 12-A - This anomaly is well developed with very good
EM character. It has fair or possibly even good intensity,
and it is directly associated with an interesting magnetic
marker of 700 gammas. Data is relatively incomplete in this
area at the extreme end of the flight lines, but the magnetic
data leaves some hope for a good prospect with fairly good
strike length. The magnetic marked is not confined to one
flight line but it does not appear to exceed 7-3/4 of a mile.
Medium priority might be considered.
Anomaly 2,2-8. - This anomaly is exceedingly weak and
definitely a suspect bedrock response. It reflects only poor
apparent conductivity and would be of little or no interest
except for the apparent magnetic association (20 - 180 gammas?).
A surficial conductor could well be indicated and only very
low priority should be considered.
geoterrex
-
12.
Anorcali e s 27 -B d ,28-^AA. - These anomalies are also very weak
with poor apparent potential. They seem to suggest very good
apparent conductivity but their poor character and lack of
magnetic support does not seem encouraging. A culture check
should probably precede other work and only low priority seems
warranted. There is no definite evidence of man-made features on
the tracking film.
A n o m q ly j)4j" A ~ This is a very weak and poorly defined response
with definite suspect character. It could be attributable to
some aircraft fluctuation or possibly to some surface feature,
(An inconclusive linear marker was noted on the film) and
followup is not recommended. There is no encouragement from
magnetics,
.^ejs^ 64-At a n.d. jS4~JB - These are very weak quadrature
responses coincident with magnetic peaks of moderate amplitude
(220 - 290 gammas). Some permeability effect of interest
could well be reflected by the slight level change of the in-
phase/ but it seems quite probable that only a zone of
surficial conductivity is reflected. The apparent conductivity is
poor and only a very low priority check is suggested.
geoterrex
-
13.
V. CONCLUSIONS
Five conductive zones and several single line
anomalies have been identified, mapped and discussed in
the survey area. No top rated targets were identified
but there are one or two prospects with comparatively
short strike lengths and encouraging EM and magnetic characte
ristics which exhibit some promise from a geophysical point
of view.
The following list summarizes those zones and
single line anomalies recommended for followup.
Zie
T-l
T-2
T-3
T-4
T- 5
Anomaly 12-A
Area of I nye st i g a t ior\r
Anomaly
27-C and 29-B
5-A
23-A and/or 25-B
53.-A
54-B
Priority
medium
medium
medium
low to medium
low to medium
medium
submitted,
'. Norgaard, P.Eng.,
R.K. Dowse, B.A.
X^^?L- AJo~t**4~z~s D.J. McQueen,^M.Sc.
ORpterrex
-
GEOTERREX LIMITED ANOMALY SHEET NO.
84-103 -
labrador Exploration (Ontario) Limited, Tommyhow Lake Sioux Lookout
ANOMALY
5 A
6 A
7 A
8 A
9 A
10 A1010
12 A
1313 A
21 A21
22 A22
23 A
24 A
25 A25 B
26 A26 B
9
i
FIDUCIALS
018.51/72
027.22/47
029.60/75
039.43/68
041.93/04?
051.15/33047.80048.29
063.40/60
073.80074.25/41
115.67/89116.48
123.10/30122.42
125.37/12*
132. 8 3/1 3C
135.92/13*136.1.1/31
142.51/70139.15/35
IN-PKASE.QIMD.
300/60
lOO/-
120/10
140/-
.15 220 A
40/-X
x
60/20
xSO/-
170/-x
140Ax
.09 230A
. 01 100 A
.11 140 A60/-
SO/-70/40
ALTITUDE
145
160
160
165
150
150
165
150'
160
150
130
160
140140
135210 1
MAGNETICS
Di r. 800#
Di r? 950/
Di r. 160#
Di r. ISO/
Di r. 300 H
Di r. 100/
Di r? 7002f
Di r. 220/
narrov/ 60^
Di r. 230/
i
Di r. 400#
Dir. 150^
S. Edge 240#S. Flank 260jf
Dir? 70/on 300/
RATE
2A
3A
3A
2A
2A
3A
3A
x
2A
3A
2A
3A
3B.3B
3A3A
COMMENTS
Trace IP, No wag.Trace IP, Ross* mag*
Outside survey area
Trace IP, * 250Jweak d questionable
Hag* slightly offseTrace IP, Poss. mag.
Trace OP, S, flank rv
off grid, not plottc
geoterrex
-
GEOTERREX LIMITED ANOMALY SHEET NO.
84-103 -Labrador Exploration (Ontario) Limited, TCMhYHQW LAKE SI CUK LOCKOUT
ANOMALY
27 Aec
20 AAA
B
29 A
36
0 3?
51 A
02- A
53 A
54 AB
55 A
56 AB
50 A
59 A
A 60 A
64 A
B
FIDUCIALS
145. 1)6/76-146.02/471 f o rv;-*1 X i /,jlAv}. /w/ A**-
l 5?. O?/?155*06/25149.70/S5
157,4/7
133.4/184
133. S5
235*90/20
240.44/75
241.70/9*
?49.tf5/^250.&7/CC
250.7/fcM
r*7.rvU x?-/ * /-s /r?*;..-V* "i v.-/' * ; *
.., , * r, r / r
Ott.65/*
?28,BC-A\
301.17/3C
O A A fn /l' v;'.-sJ* ' J./ v'-
IN-PHASE.QUAD.
70/40. coA
M7 120/;
.' 70A40/-7oA
60/00'
a
x
^a.o 20/G
40A
J.70A
0,OS 40AsoA
.05 70/30
.//,o4GA
i h/r-'O-
7V-
1 J* If'*, y
-/so
a* 05 M/4-C
ALTITUDE
1 00if b
0 195
175MO*
175
) 161
18f
170
J 75205
185 1
.105'140
155
t r. 5
1S5
165
'
MAGNETICS
N Side 60#Poes* slight?.DI r, 230Jf
Di r. 50|nil.
Poea. I20/
Dlr* 200|?
DirV 28-Ojf
Po*ft* GOO^
M. flonk JL500]f
nil.on bsoad 100 J?
or* brood 100/
"Di r. 1300|nil.
Uir. 7CO|
Pi r. 160/
Dire ICO/
Di*-. ,220|
Dir. 2901
RATE
30K
2A
3Ax3A
x
K
21
x31
3C
O/K
H
3A
3A
x
COMMENTS
very cuspoctIHiteido eiwrv^ey a3f c
*Si EH roepon&o obacurby E quip*
ra t ho v w oaknarrower **jg?
duol? port direct tsctr
Trcso IP?
Ti'OCO XP, Ho BOQt
;Wook, q^ationoblo
poorly ohopedjr ouislsurvey e rea
Vg^ questionable
fos.ibl* dlMCt IN:.
broodoc CP?
Poor 3
dual, ttoctk
Vozy weok d qw^cii-'able* pipai^u.
-
GEOTERREX LIMITED ANOMALY SHEET NO.
64*103Lpbrodor Exploration (Ontario) Limited, TC11MYHOW LAKE SXOUX LOOKOUT
ANOMALY
70 A
.
FIDUCIALS IN-PHASE.QUAD. ALTITUDE
195
MAGNETICS
Di r? ?aoj
RATE
t** &A
COMMENTS
Cut s id© survey ci ir® o ••only f di sr EH
g&oterrex
-
ntario
Ministry ofNorthern Developmentand Mines
MOTE TO
rf AS
O r^e M i*)iSTiy
'M ̂ 1*112- ,
SUi ^ftSI-f tSH I6o6 LAl^E CuAiM
By
Cu\e tAT
fop. iT
R. C.
-
APPENDIX "B"
Following is a description of equipment and procedures used during this airborne geophysical survey.
A. EQUIPMENT
1) Aircraft;
The aircraft is a .deHavilland Otter DHC-3 with Canadian registration CF-AYR. This aircraft is a single engine, slow speed, high performance type with a gross weight of 8,000 Ibs. The aircraft may be equipped with wheels, skis, or floats, as required. ^oritio.ls^r^ej^siDeeolis^^Oinilesper hour,
2) Electronic gn etometer;
The electromagnetic unit is a Rio Tinto ^vpe. measuring In-Phase and Out-of-PJiQ^^ cjLinpjmejits of the secondary field at a frequency of 320 cycj^es per second. The unit was de- si gne'T'^na'D'uiTrDiyGeoterrexTaridcoTrTes Serial #1.
A transmitter generates a closely controlled sine wave of 320 cps which is amplified and fed to a transmitting coil mounted on the starboard wing-tip. This coil is iron cored and has vertical windings, with coil axis in the direction of flight. The circulating coil power is some 5000 volt amperes.
A receiving coil is mounted on the port wing, co-planar with, and 62 feet from, the transmitting coil. The voltage developed in the receiver coil due to the transmitted field is some 300 millivolts. In the absence of external conduc tors, this voltage is cancelled by a reference voltage de rived directly from the transmitter voltage.
When the aircraft comes within range of a conductor, the normal (or primary) field is changed by a secondary field, and the resultant voltage at the receiver coil is amplified and passed on to the EM receiver in the aircraft. This signal is filtered and split into one component in-phase and one component out-of-phase with reference to the transmitter voltage. The signals are then passed through phase-sensitive detectors where their amplitudes may be read on meters, or
ggoterrex
-
2.
recorded on a chart. A time constant of 2.0 seconds is used for the recording of these responses. A system of calibra tion is included so that amplitude of responses (anomalies) may be determined in "parts per million" of the primary receiver coil voltage prior to cancellation. Noise level of the system due to movement of the metal aircraft within the EM field is normally 50 parts per million or less. Signifi cant conductors depending on distance and size, will produce anomalies of more than 50 parts per million.
The system is equipped with a third independent channel which may be used to measure spurious electrical noise (independent of EM noise) at any selected frequency. It is frequently used to display a second in-phase response at a time constant of 0.6 seconds which enables improved resolution for comparison with the normal responses.
An accelerometer is also installed and the output recorded on the 8-channel recorder. This indicates vertical motion of the aircraft and enables discarding of false anomalies which could result from aircraft flexure.
Calibration marks are displayed on the eight-channel chart, and are approximately 15 millimeters for 200 parts per million.
Any anomalies noted are listed in Appendix A of this report, indicating position, (fiducial number on the path recovery camera), amplitudes, aircraft altitude, magnetic relationship if any, relative anomaly rating, and comments which may be of significance.
The anomalies are then plotted on the base map in coded form, according to the legend accompanying this Appendix. Anomaly groups which reflect probable ground conductors are circled and numbered. These are described and discussed in the report in the context of geophysical and where possible, geological significance.
3) Magnetometer:
The magnetometer used is a Geometries Model G-803 Proton Resonance. y^e incorporating a High Performance option.
g&oterrex
-
3.
Recording times are variable, from three times per second to once per 2 seconds, with respective J^ejn|s^tivitiegH||of^I^
once per second with a sensitivity of 1 gamma*
The sensing head is a toroidal coil immersed in a special hydrocarbon fluid and mounted beneath the port wing.
The magnetometer is a digital readout unit and output is used to drive a paper recorder (Hewlett Packard Model 5050-6). In addition analogue outputs are fed to the eight- channel recorder for direct comparison with the electro magnetic results, and to a Hewlett-Packard Model 680 - six inch rectalinear strip recorder.
Full scale deflection usually used in mineral surveys is 1000 gammas although other sensitivities are available. Automatic stepping of the full scale analogue deflection is incorporated. Recordings made on the paper *ape are the values of the total field intensity.
Contouring of results is accomplished as desired.
4) Spectrometer;
An ̂ (^^iiai'iiumDGRSj^O^ ̂sj^ectromt^e^i s optionally carried ~bn the Otter, along with a sensing head containing either three 6" x 4" Sodium Iodide crystals, or a single 8" x 4" crystal.
This is a ̂ SfmS^&mSS^l^ d ifferential gamma-ray unit ^neasurina energy levels of potassium 4,fl, h.^mM+h 91*, Thallium 208 and total count.
Time constants and full scale ranges are variable and are selected to suit the conditions and background of the survey area.
Depending on requirements of the survey, one or more channels may be recorded on the eight channel recorder.
Data presentation, if required, is usually in the form of plotted anomalies showing channel intensities and aircraft altitude. Contour maps of one or more channels may be pro duced in special circumstances.
gftoterrex
-
5) Altimeter;
The altimeter is a GAR Model 10 wide band radar type. One unit is carried on each wing. The output from the alti meter recorded on the eight-channel recorder. The recording is linear and normally covers from 50 feet to 300 feet, or 25 feet per major division.
6) Camera;
The camera used for path recovery is a Hulcher contin uous strip 35 millimeter type. It can accommodate 400 ft. lengths of film, good for some 250 line miles of survey. It is fitted with a special wide angle lens for low level work.
Fiducial numbers and markers are impressed on the film and controlled by the intervalometer.
7) Intervalometer;
This is a Geoterrex Model X-1 solid state unit which derives triggering from the magnetometer. Basic fiducial pulses are provided once for each two magnetometer readings, so that in usual operation one fiducial is recorded every two seconds. A long pulse is produced once for every ten normal fiducials.
These fiducials marks are impressed on the path recovery film, the eight-channel recorder, the Hewlett Packard Model 680 recorder and the digital printer in order to identify and locate geophysical records with ground positions.
8) E i g ht-Cha n n el Reco rd e r;
This recorder is a Gulton Industries Model TR-888. Records are made on heat sensitive paper of 16 inch width. Each channel has a width of 1.6 inches. Individual signal processors are included for each channel, selected according to requirements for each channel to be recorded.
Normal chart speed is 5.0 inches per minute giving a horizontal scale of approximately 1000 feet per inch.
A typical chart record is included with this appendix.
geoterrex
-
B. PROCEDURES
1) Photo Laydowns:
Prior to undertaking of the survey, air photos of the area are obtained from which a photo laydown is produced, to an appropriate scale, usually 1" s 1320 feet. Proposed lines are drawn on the laydown, in the appropriate direction and line spacing. These "flight-strips" are then used by the air crew for navigating the airplane visually along the proposed lines. This photo laydown is also used to produce the subsequent base maps.
2) Aircraf t Ope rati on:
The air crew consists of pilot, co-pilot (or naviga tor) and equipment operator. The aircraft is flown along the proposed lines at an altitude of some ZQH f^fiJL^ using the flight strips for navTgaTToru Altitudes in excess of 300 feet are generally considered too high for effective penetration.
The operator records lines, direction of flight and starting and finishing fiducial numbers on a flight log. Equipment is normally left on during the whole of the survey flight, while the intervalometer is turned on only for the actual survey line. Thus, the appearance of fiducial marks on the charts indicates the extent of the survey line.
3) Field Reduction;
Upon completion of the flight, the film is developed and the actual path of the aircraft is plotted on the photo laydo.wn. This is accomplished by comparing the film points with the photo. For any given point, the appropriate fid ucial number is placed on the photo laydown and the points joined to produce the actual flight path.
When field results are desired, anomalies are chosen and assigned appropriate fiducial numbers. The anomalies are then transferred to their correct position on the photo laydown.
geoterrex
-
6.
4) Office Reduction;
On the completion of the survey, base maps are drawn using the photo laydown as a base. Flight lines and fid ucial numbers are shown on this base map*
In the case of EM or radiometric results the anomalies are then plotted on the base map as boxes with symbols representing anomaly grade or amplitude (as noted on the legend accompanying each map). Anomaly "systems" are then outlined as conductive zones at which stage geological comparisons and interpretation may be made.
In the case of magnetic results, the values noted on the Moseley chart are transcribed to a work sheet (overlay of the base map) after levelling or correcting for heading error, diurnal, etc* The values are then contoured on the work sheet and then drafted on a copy of the base map.
Since base maps use the photo laydown as a base, all geophysical results portrayed may be compared as overlays, and all features of interest may be identified on the appropriate photo for subsequent ground location.
ggoterrex
-
A - S i.jrejxgjbh
AJPELENDJLX C
CONDUCTOR RATINGS
Mostly V Mostly 2 ! Mostly 3 ! Mostly X !
1510
5O
MAX
15
B - Conductivity
C - V G r i g bil i ty
^ - AfoAK6 ken^Ah
E - Mag Correl'n
F ~ Geology
G - Structure
15Ration! 10 Ratio .5 to 1 5
O
15
EM YesNo
Mag YesNo
^ -f- mi .•^ to 1 mi'.1 to 2 mi.> 2 mi.
100
50
151050
Direct 15Sporadic Dir. 10Assoc. 5Nil O
Favourable 15Unknown 10Unfavourable O
Fault, Fold 10Arcuate 5Straight O
H - Miscellaneous Subjective evaluationRanging from -15 to +15
10
5
15
15
15
10
TOTAL: 100
g&otera
-
CONDUCTOR R ATINGSPROJECT 84
ZONE
T-1
T-2
T-3
STRENGTH
5
8
6
CONDUC TIVITY
15
15
15
i
T-4 5 i 14
T-5
i5 15
VARIABILITYEM
3
2
4
5
1
•- - - ', '— — - — r "" "— ' — - j i
L
...,..' .. '
*,
^W
41 —— W—
MAG2
5
2
5
^
,,*- - ....,-v,,™,,.
STRIKE LENGTH
7
10?1
10
7
7
MAGNETIC ASSOCIATION
15
15
10
6
15
GEOLOGY
5
5
5
5 -
5
i
"^
STRUC TURE
— m
MSC.
5
-
4-10
-
-
*
TOTAL
50
60
52
50
41
. '
CATEGORY———————— *^ ——
- COMMENTS
B Eone is outside! survey and striljlenqth unknown,,
B
B
3
B"
~
Good EM with mag
Strike directiofmqy indirnfp n
relationship wi~zones T-2 and T—'length unknown
fair intensityonly
.
9..v........ .. ........ ...
-
IN-PHASE/OUT-OF-PHASE OTTER SYSTEM
ANOMALY GRADING
l-A Grade
Intensity greater than 400 p.p.m. at 150 altitude Good character and correlation Direct magnetic correlation.
1-B Grade
As for l-A but without direct magnetic correlation
ixxxxxxxxxxxxxi 2 -A Grade
Intensity greater than 150 p.p.m. at 150' altitude Good character and correlation Direct magnetic correlation
in j 1111 mi in 2 -B Grade
As for 2-A but without direct magnetic correlation
3-A Grade
Intensity less than 150 p. p. m. at 150* altitude Reasonable character Direct magnetic correlation
3-B Grade
As for 3-A but without direct magnetic correlation
"X" Type
Weak or questionable anomaly
X - Possible anomalous indication.
-
52H13SE0e24 2 .974 WHITEBIRCH LAKE
REPORT ON A
020
RADIOMETRIC SURVEY
IN THE
TOMMYHOW LAKE AREA
OF WESTERN ONTARIO
FOR
LABRADOR EXPLORATION (Ontario) LIMITED
CONDUCTED BY
GEOTERREX LIMITED
PROJECT 84-103
OTTAWA, Ontario,
June, 1972
P. Norgaard, P.Eng., Reva Dowse, B.A., Don McQueen, M.Se.,
GEOPHYSICISTS
geoterrex
-
1.
I. INTRODUCTION
This report provides an abbreviated interpretation
of the radiometric data obtained in an airborne survey flown
on behalf of Labrador Exploration (Ontario) Limited.
An Otter aircraft with Canadian registration CF-AYR
was used throughout the survey/ and it was equipped with an
In-Phase/Out-of-Phase el e c t romqgjj^tj^c—-s^sjkejn- operating at
320 \\Zj a geometrics G-803 HighPerformgnce proton resonance
magnetometer, a DGRS 1000 gamma roy spectrometer/ and associated
survey equipment. (See Appendix for detailed description of
equipment, compilation procedures and method of control).
The survey block is centred around Lot. 49 50N and
Long. 89 45 W. Lines were flc)wn--N20—W with ySmi^e^^sjyy^Ti^
and also E-W at intervals of j- mile. A total of 151 line^
miles was compiledcro-y-ej:^jifl-^Ji^jJUuJ]L-qj:c^iB out of a total
260 miles 'flown.
The radiometric results are shown as total count
anomalies on a plan map with a scale of l inch s 1/320 feet.
The terrain clearance is indicated, as well as any possible
contribution from land-water interplay or altitude fluctuation. '
This map has also been used to present the electromagnetic
results in order that a consolidation of both sets of data could
be effected.
geoterrex
-
II. 'PERSONNELl . .1. ..•••..t—.~-~-^.-^.,.
The personnel involved in this survey include the
following:
A. Field Op e r a t i on
Pilot A. Bratteng, Ottawa
Navigator R. Bolivar, Ottawa
Operators B. Hind, OttawaS. Harrison, Ottawa B. Kramer, Ottawa
Data Compilers C. Taggart, OttawaL. Matthews, Ottawa
Aircraft Engineer L. Fougere, Ottawa
Geophysicist D. McQueen, Ottawa.
B* Off ice Compilation
Data D. Sarazin, Ottawa
Drafting M. Dostaler, Ottawa
Geophysics R. Dowse, OttawaD. Wagg, ManotickD. McQueen, Ottawa
gqoteiTBK
-
3.
III. CLAIMS COVERED - 173 Mileage within claims - 151
Total Mileage . - 260
251859262^95*
263124
287709
288279
288301
288552
288803
302543
304322
309216
335996
336022
- 262904
- 263133
- 287728
- 288292
- 288314
- 288553
~ 288822
- 302551
- 304333
- 309276
- 335999
- 336029
incl.
i ne J..
incl.
incl.
incl.
incl.
incl.
incl.
incl.
incl.
incl.)
incl.)These claims were staked since the
the surveys were performed -12
claims staked May 19, 1972.
Airborne geophysical certificate
being applied for.
geoterrex
-
4.
IV. GENERAL
A* Rod i om e t ri c T h epr y
Certain elements are naturally radioactive, decaying
spontaneously as their atomic structures are transformed/
and emitting particles or electromagnetic radiation (gamma
rays) in the process. The transformed atoms may be stable,
or may be radioactive themselves, creating a series of
daughter products until a stable element is finally produced.
The principal elements causing the natural radioactivity of
rocks are isotopes of uranium, thorium and potassium.
The particles emitted in this radioactivity have little
penetrating power, and only the gamma rays have practical
importance in field surveys. Each emission of gamma rays
has a pattern of energy levels characteristic of the
transformation of a particular element, giving an opportunity
of detecting that element. Studies of the spectra of gamma
radiation have led to the choice of distinguishing uranium
(U-238) by gamma radiation with an energy level of 1.76 Mev,
which is actually emitted by one of its daughter products, bismuth
(Bi-214). Similarly, thorium (Th-232) is distinguished by
gamma rays of 2.62 Mev from its daughter thallium (TL-208).
Radiation from potassium (K-40) has a single energy level,
1.46 Mev.
The approach of using a daughter to detect the presence
of a parent is valid only if the radioactive series is in
OGtrterrex
-
5.
equilibrium. Since the daughters have different chemical
properties, they may be separated from the parent. For
example, radon is a gaseous daughter of uranium which can
migrate. Since bismuth is in turn a daughter of radon, the
migration can leave a uranium deposit with little radioactivity
at 1.76 Mev, while the measured radioactivity is concentrated
over the radon where there is actually but little uranium. This
effect can be extremely important in radiometric surveys. Since
most of the natural radiation is absorbed by less than one
foot of rock, direct detection of subsurface radioactive mineral
deposits is impossible, but their presence is often detectable
from migrated daughter products at the surface. Similarly, faults
and fissures which control the movement of ions may be detected.
In this sense there is an intimate connection between radiometric
and geochemical surveys.
The natural radiation is attenuated as it travels away
from the source, principally by Compton scattering. This
reduces the energy and changes the direction. In effect,
individual peaks in the energy spectrum are broadened. The
intensity of radiation travelling more than 150 feet from a
point source approximates the following equation (Gregory d
Horwood, 1963):
4lfd2
Where I , I - i ntensity at distances d and o
and /j x e ffective attenuation coefficient.
geoterrex
-
6.
This equation will be modified for larger sources/ with the
intensity decreasing less rapidly with distance than the
inverse square relationship.
In addition to the radioactivity coming from the ground/
there can be significant signals in the air from cosmic and
atmospheric causes. These unwanted signals form part of the
background level of intensity, which varies with time.
Unusual atmospheric conditions, especially rain or thunderstorms,
can completely invalidate airborne radiometric measurements.
The scintillation counter detects the arrival of gamma
rays by the light produced in a large sodium iodide crystal.
These scintillations are transformed into electronic signals
by photomultiplier tubes and can then be processed electronically
before recording. A large crystal is necessary to ensure high
efficiency in absorbing the gamma rays, and also a signal
sufficiently large to be statistically valid. For spectrometer
operation^ the signals are processed to give the total counts
per second, and, by means of "windows", the counts per second
at different energy levels.
B. Radiomotric Compilation
Upon receipt of the field data in the head office, the
radiometric charts were analyzed in detail. At first, and
for every line, a noise envelope was established, the amplitude
of which would be compared with that of apparent anomalies.
If the latter had a comparable amplitude, they were rejected.
geoterrex
-
7.
Once an anomaly is located/ a baseline representing the
background level is established from which the amplitude of the
anomaly is measured. The g n oma l i e s on the interpretgtjjon map
are shown aA-tcLtfll—c-ciyji^s--p,er—s^^ojid—above a local background.
These anomalies are also coded as being either good, intermediate
or poor features. (See Legend).
A "good" anomaly means that the feature has a relative
amplitude generally greater than 100?2 of background and possesses
a well defined, not overly broad, bell-type character. A poor
feature is one which might have an amplitude of 100/2 background
but does not enjoy a good character. It might be spike shaped or
associated with the topographic relief.
geoterrex
-
8.
v - PISCUSSION OF RADIOHETRIC RESULTS
Results obtained from the airborne radiometric survey
were quite negative largely due to snow cover on the ground.
Some total count anomalies were identified, but these generally
relate to lakes and rivers, and can probably be attributed mainly
to land-water interplay. They reflect only weak to moderate inten
sities and generally exhibit poor anomaly character. Some
contribution from varying depths of snow cover is also suspected.
No good radiometric anomalies were identified within the
survey grid. The more interesting anomalous regions appear to
include the strongest responses such as those on lines 37 and 66
which exhibit total counts of 136 and 144 above background, and those
clusters where some increased amplitude and/or lineation is
suggested, such as the grouping along the eastern perimeter
(lines 53-55) and the one extending from line 12 through line 16.
Respectfully submitted,
P. Norgaard, P.Eng.
R, Dowse, B.A. :
geotera
-
APPENDIX
Following is a description of equipment and procedures used during this airborne geophysical survey.
A. EQUIPMENT
1) Aircraft;
The aircraft is a deHavilland Otter DHC-3 with Canadian registration CF-AYR. This aircraft is aTTTigTe engine, slow speed, high performance type with a gross weight of 8,000 Ibs. The aircraft may be equipped with wheels, skis, or floats, as required. Normal ̂sjAryey speed is 1 00 jnile- s—p,er hour.
2) Electromagnetometer:
The electromagnetic unit is a R i o TJjiJ^iIn-Pha^,e-—OJ3-d—0-UJL-of-Phase components of the secondary field at a freOjUenjjv^of^ j^O^jsjtgjLe^^Der^se^ojjjjLi The unit was de signed and built by Geoterrex, and carries Serial #1 .
A transmitter generates a closely controlled sine wave of 320 cps which is amplified and fed to a transmitting coil mounted on the starboard wing-tip. This coil is iron cored and has vertical windings, with coil axis in the direction of flight. The circulating coil power is some 5000 volt amperes.
A receiving coil is mounted on the port wing, co-planar with, and 62 feet from, the transmitting coil. The voltage developed in the receiver coil due to the transmitted field is some 300 millivolts. In the absence of external conduc tors, this voltage is cancelled by a reference voltage de rived directly from the transmitter voltage.
When the aircraft comes within range of a conductor, the normal (or primary) field is changed by a secondary field, and the resultant voltage at the receiver coil is amplified and passed on to the EM receiver in the aircraft. This signal is filtered and split into one component in-phase and one component out-of-phase with reference to the transmitter voltage. The signals are then passed through phase-sensitive detectors where their amplitudes may be read on meters, or
QROtBrPBX
-
2.
recorded on a chart. A time constant of 2.0 seconds is used for the recording of these responses. A system of calibra tion is included so that amplitude of responses (anomalies) may be determined in "parts per million" of the primary receiver coil voltage prior to cancellation. Noise level of the system due to movement of the metal aircraft within the EM field is normally 50 parts per million or less. Signifi cant conductors depending on distance and size, will produce anomalies of more than 50 parts per million.
The system is equipped with a third independent channel which may be used to measure spurious electrical noise (independent of EM noise) at any selected frequency. It is frequently used to display a second in-phase response at a time constant of 0.6 seconds which enables improved resolution for comparison with the normal responses.
An accelerometer is also installed and the output recorded on the 8-channel recorder. This indicates vertical motion of the aircraft and enables discarding of false anomalies which could result from aircraft flexure.
Calibration marks are displayed on the eight-channel chart, and are approximately 15 millimeters for 200 parts per million.
Any anomalies noted are listed in Appendix A of this report, indicating position, (fiducial number on the path recovery camera), amplitudes, aircraft altitude, magnetic relationship if any, relative anomaly rating, and comments which may be of significance.
The anomalies are then plotted on the base map in coded form, according to the legend accompanying this Appendix. Anomaly groups which reflect probable ground conductors are circled and numbered. These are described and discussed in the report in the context of geophysical and where possible, geological significance.
3) Magnetometer;
The magnetometer used is a Geometrics Mojle^L-G-iiOJL-type incorporating a High Performance option.
geoterrex
-
3.
Recording times are variable, from three times per second to once per 2 seconds, with respective sensitivities of 2 gammas to 0.5 gamma. In jiormql^ use readings ore obtained once er second with a
The sensing head is a toroidal coil immersed in a special hydrocarbon fluid and mounted beneath the port wing.
The magnetometer is a digital readout unit and output is used to drive a paper recorder (Hewlett Packard Model 5050-8). In addition analogue outputs are fed to the eight- channel recorder for direct comparison with the electro magnetic results/ and to a Hewlett-Packard Model 680 - six inch rectalinear strip recorder.
Full scale deflection usually used in mineral surveys is 1000 gammas although other sensitivities are available. Automatic stepping of the full scale analogue deflection is incorporated. Recordings made on the paper *ape are the values of the total field intensity.
Contouring of results is accomplished as desired.
4) Spectrometer;
An Exploranium DGRS— IQOQ—S-tifi-Cjt-niDLfljLBJi- is optionally carried on the Otter, along with a sensing head containing either three 6" x 4" Sodjjuii— I^idJ^Le—C-r-i^s^LLs. or a single 8" x 4'r crystal.
This is a^our channel measuring energy levels of thallium 208^ and total
Time constants and full scale ranges are variable and are selected to suit the conditions and background of the survey area.
Depending on requirements of the survey, one or more channels may be recorded on the eight channel recorder.
Data presentation, if required, is usually in the form of plotted anomalies showing channel intensities and aircraft altitude. Contour maps of one or more channels may be pro duced in special circumstances.
geoterrex
-
5) Altimeter;
The altimeter is a GAR Model 10 wide band radar type. One unit is carried on each wing. The output from the alti meter recorded on the eight-channel recorder. The recording is linear and normally covers from 50 feet to 300 feet, or 25 feet per major division.
6) Came ra;
The camera used for path recovery is a Hulcher contin uous strip 35 millimeter type. It can accommodate 400 ft. lengths of film, good for some 250 line miles of survey. It is fitted with a special wide angle lens for low level work.
Fiducial numbers and markers are impressed on the film and controlled by the intervalometer.
7) Intervalometer;
This is a Geoterrex Model X-1 solid state unit which derives triggering from the magnetometer. Basic fiducial pulses are provided once for each two magnetometer readings, so that in usual operation one fiducial is recorded every two seconds. A long pulse is produced once for every ten normal fiducials.
These fiducials marks are impressed on the path recovery film, the eight-channel recorder, the Hewlett Packard Model 680 recorder and the digital printer in order to identify and locate geophysical records with ground positions.
8) Eight-Qhqnnel Recorder;
This recorder is a Gulton Industries Model TR-888. Records are made on heat sensitive paper of 16 inch width. Each channel has a width of 1.6 inches. Individual signal processors are included for each channel, selected according to requirements for each channel to be recorded.
Normal chart speed is 5.0 inches per minute giving a horizontal scale of approximately 1000 feet per inch.
A typical chart record is included with this appendix.
geotera
-
B. PROCEDURES
1) Photo Laydowns:
Prior to undertaking of the survey, air photos of the area are obtained from which a photo laydown is produced, to an appropriate scale, usually l" s 1320 feet. Proposed lines are drawn on the laydown, in the appropriate direction and line spacing. These "flight-strips" are then used by the air crew for navigating the airplane visually along the proposed lines. This photo laydown is also used to produce the subsequent base maps.
2) Aircraft Operation:
The air crew consists of pilot, co-pilot (or naviga tor) and equipment operator. The aircraft is flown alongthe proposed lines at an altijJj^jjj|e-jgif--^ojje—l2flP-JEfiJBifc using the flight strips for navigation. Altitudes in excess of 300 feet are generally considered too high for effective penetration.
The operator records lines, direction of flight and starting and finishing fiducial numbers on a flight log. Equipment is normally left on during the whole of the survey flight, while the intervalometer is turned on only for the actual survey line. Thus, the appearance of fiducial marks on the charts indicates the extent of the survey line.
3) Field Reduction;
Upon completion of the flight, the film is developed and the actual path of the aircraft is plotted on the photo laydo.wn. This is accomplished by comparing the film points with the photo. For any given point, the appropriate fid ucial number is placed on the photo laydown and the points joined to produce the actual flight path.
When field results are desired, anomalies are chosen and assigned appropriate fiducial numbers. The anomalies are then transferred to their correct position on the photo laydown.
geoterrex
-
6.
4) Office Reduction;
On the completion of the survey, base maps are drawn using the photo laydown as a base* Flight lines and fid ucial numbers are shown on this base map.
In the case of EM or radiometric results the anomalies are then plotted on the base map as boxes with symbols representing anomaly grade or amplitude (as noted on the legend accompanying each map)* Anomaly "systems" are then outlined as conductive zones at which stage geological comparisons and interpretation may be made*
In the case of magnetic results, the values noted on the Moseley chart are transcribed to a work sheet (overlay of the base map) after levelling or correcting for heading error, diurnal, etc. The values are then contoured on the work sheet and then drafted on a copy of the base map.
Since base maps use the photo laydown as a base, all geophysical results portrayed may be compared as overlays, and all features of interest may be identified on the appropriate photo for subsequent ground location.
geoterrex
-
52H13SE08I24 8.974 WHITEBIRCH LAKE
REPORT ON A
MAGNETOMETER SURVEY
IN THE
TOMMYHOW LAKE AREA
OF WESTERN ONTARIO
FOR
LABRADOR EXPLORATION (Ontario) LIMITED
CONDUCTED BY
GEOTERREX LIMITED
PROJECT 84-103
030
'SECTION'
OTTAWA, Ontario,
June, 1972.
P. Norgaard, P.Eng., Reva Dowse, B.A., Don McQueen, M.Se.,
GEOPHYSICISTS
geoterrex
-
I . INTRODUCTION
This report provides an abbreviated interpretation of
the magnetic data obtained in an airborne survey flown on
behalf of Labrador Exploration (Ontario) Limited.
An Otter aircraft with Canadian registration CF-AYR was
used throughout the survey, and it was equipped with an In-Phase/
Out-of-Phase electromagnetic system operating a t J^O.Jiz^ a
Geometrics G-8Q3 High Performance proton resonance magnetometer/
a DGRS LQOJL,flmiima ray spectrometer and associated survey equipment.
.(See Appendix for detailed description of equipment, compilation
procedures and method of control).
The survey block is centred around Lot. 49 SON and
Long. 89 45 W. Lines were fJ.j)wn—N2(LJi with ymi-Leacina and
also E-W at intervals of 4- mile. A total of 151 line miles was
compiled covering the claim group out of a total of 260 miles
flowt
Navigation was by visual means utilizing photo-mosaics
at a scale of l inchr:l,320 feet and mean terrain c l e q rar\zs—si3,
maintained throughout the survey area.
Magnetic contours were drafted on a base jnap at a scale
of l inch:rl,320 Jh^al^pnd intervals of 20 gammers, are shown wherever
possible. Values shown represent relative field intensities.
geoterrex
-
II, PERSONNEL
The personnel involved in this survey include the
following:
A. Fi eld O p e ra t i on
Pilot
Navigator
Operators
Data Compilers
A. Bratteng, Ottawa
R. Bolivar, Ottawa
B. Hind, OttawaS, Harrison/ OttawaB. Kra.mer, Ottawa
C. Taggart, OttawaL. Matthews, Ottawa
Aircraft Engineer L. Fougere/ Ottawa
Geophysicist D. McQueen, Ottawa.
Off ice^ Cqmpilcitipn
Data D. Sarazin, Ottawa
Drafting
Geophysics
M. Dostaler/ Ottawa
R. Dowse/ OttawaD. Wagg/ ManotickD. McQueen/ Ottawa
DROterrex
-
3.
III. CLAIMS COVERED - 173 Mileage within claims - 151
Total Mileage - 260
251859262895,
263124
287709
288279
288301
288552
288803
302543
304322
309216
335996
336022
- 262904
- 263133
- 287728- 288292
- 288314
- 288553
- 288822
~ 302551
- 304333
- 309276
- 335999
- 336029
incl.
incl.
incl,
incl.
incl.
incl.
incl.
incl.
incl.
incl.
incl.)
incl.)These claims were staked since the
the surveys were performed - 12
claims staked May 19, 1972.
Airborne geophysical certificate
being applied for.
geoterrex
-
4.
J V. INTERPRETATION
The magnetic pattern in this area is rather suggestive
of an intermediate volcanic rock type interspersed with minor
metasediments. The density of axes is moderate, and long, linear
bands ore common. Relative amplitudes generally range from 100 -
400 gammas, although one or two more basic bodies exhibit a
maximum relief above the regional background of 900 - 1000
gammas. The predominant strike is E-W, changing gradually to
NE-SV7, but a few interesting N-S feature? are also apparent
(300-500 J ), particularly along the western perimeter.
The main series of faulting appears to strike E-W, but
minor lineations with N-S and NNE-SSW trends are also reflected to
some degree.
Respectfully submitte
R. Dowse, B.A.
P'. Norgaard, P.
geoterrex
-
APPENDIX
Following is a description of equipment and procedures used during this airborne geophysical survey.
A. EQUIPMENT
1) Aircraft;
The aircraft is a deHavilland Otter DHC-3 with Canadian registration CF-AYR. This aircrafTT!s™lcisTTTgle engine, slow speed, high performance type with a gross weight of 8,000 Ibs. The aircraft may be equipped with wheels, skis, or floats, as required. Normal survey speed is TOO miles per hour.
2) Electromagnetometer;
The electromagnetic unit is a Rio^Tintotvp^^mejj^ury^ In-Phase and Out-of-Phase components of the secondary field '^T^cT'frequencv o^^jj^pj^gj-gsper^s^^nd. The unit was de- si gneaarid^builtby^Geoterrex,^ariacarrie s Serial #1.
A transmitter generates a closely controlled sine wave of 320 cps which is amplified and fed to a transmitting coil mounted on the starboard wing-tip. This coil is iron cored and has vertical windings, with coil axis in the direction of flight. The circulating coil power is some 5000 volt amperes.
A receiving coil is mounted on the port wing, co-planar with, and 62 feet from, the transmitting coil. The voltage developed in the receiver coil due to the transmitted field is some 300 millivolts. In the absence of external conduc tors, this voltage is cancelled by a reference voltage de rived directly from the transmitter voltage.
When the aircraft comes within range of a conductor, the normal (or primary) field is changed by a secondary field, and the resultant voltage at the receiver coil is amplified and passed on to the EM receiver in the aircraft. This signal is filtered and split into one component in-phase and one component out-of-phase with reference to the transmitter voltage. The signals are then passed through phase-sensitive detectors where their amplitudes may be read on meters, or
geoterrex
-
2.
recorded on a chart. A time constant of 2.0 seconds is used for the recording of these responses. A system of calibra tion is included so that amplitude of responses (anomalies) may be determined in "parts per million" of the primary receiver coil voltage prior to cancellation. Noise level of the system due to movement of the metal aircraft within the EM field is normally 50 parts per million or less. Signifi cant conductors depending on distance and size, will produce anomalies of more than 50 parts per million.
The system is equipped with a third independent channel which may be used to measure spurious electrical noise (independent of EM noise) at any selected frequency. It is frequently used to display a second in-phase response at a time constant of 0.6 seconds which enables improved resolution for comparison with the normal responses.
An accelerometer is also installed and the output recorded on the 8-channel recorder. This indicates vertical motion of the aircraft and enables discarding of false anomalies which could result from aircraft flexure.
Calibration marks are displayed on the eight-channel chart, and are approximately 15 millimeters for 200 parts per million.
Any anomalies noted are listed in Appendix A of this report, indicating position, (fiducial number on the path recovery camera), amplitudes, aircraft altitude, magnetic relationship if any, relative anomaly rating, and comments which may be of significance.
The anomalies are then plotted on the base map in coded form, according to the legend accompanying this Appendix. Anomaly groups which reflect probable ground conductors are circled and numbered. These are described and discussed in the report in the context of geophysical and where possible, geological significance.
3) Magnetometer;
The magnetometer used is a Geojnfi±JiLc-S-J1odel G-803 Proton Resonance type incorporating a JUgh Performance option.
geoterrex
-
3.
Recording times are variable, from three times per second to once per 2 seconds, with respective sensitivities of 2 gammas to 0.5 gamma. In once per second with a
The sensing head is a toroidal coil immersed in a special hydrocarbon fluid and mounted beneath the port wing.
The magnetometer is a digital readout unit and output is used to drive a paper recorder (Hewlett Packard Model 5050-6). In addition analogue outputs are fed to the eight- channel recorder for direct comparison with the electro magnetic results, and to a Hewlett-Packard Model 680 - six inch rectalinear strip recorder.
Full scale deflection usually used in mineral surveys is 1000 gammas although other sensitivities are available. Automatic stepping of the full scale analogue deflection is incorporated. Recordings made on the paper *ape are the values of the total field intensity.
Contouring^ of results is accomplished as desired.
4) Spectrometer :
An Exploranium DGRS-1QOO,^seectrometer is optionally carried on the Otter, along with a sensing head containing either three 6" x 4" Sodium Iodide crystals, or a single 8" x 4" crystal.
This is a fjoinj^jjjjTajT^g^jdi.ffejrei'jitia^measuring energy levels of potassium 40. bismuth 214, thallium 208 and total count^
Time constants and full scale ranges are variable and are selected to suit the conditions and background of the survey area.
Depending on requirements of the survey, one or more channels may be recorded on the eight channel recorder.
Data presentation, if required, is usually in the form of plotted anomalies showing channel intensities and aircraft altitude. Contour maps of one or more channels may be pro duced in special circumstances.
OGOterreK
-
5) Altimeter;
The altimeter is a GAR Model 10 wide band radar type* One unit is carried on each wing. The output from the alti meter recorded on the eight-channel recorder. The recording is linear and normally covers from 50 feet to 300 feet, or 25 feet per major division.
6) Came ra;
The camera used for path recovery is a Hulcher contin uous strip 35 millimeter type. It can accommodate 400 ft. lengths of film, good for some 250 line miles of survey. It is fitted with a special wide angle lens for low level work.
Fiducial numbers and markers are impressed on the film and controlled by the intervalometer.
7) Intervalometer;
This is a Geoterrex Model X-1 solid state unit which derives triggering from the magnetometer. Basic fiducial pulses are provided once for each two magnetometer readings, so that in usual operation one fiducial is recorded every two seconds. A long pulse is produced once for every ten normal fiducials.
These fiducials marks are impressed on the path recovery film, the eight-channel recorder, the Hewlett Packard Model 680 recorder and the digital printer in order to identify and locate geophysical records with ground positions.
8) Eight-Channel Recorder;
This recorder is a Gulton Industries Model TR-888. Records are made on heat sensitive paper of 16 inch width. Each channel has a width of 1.6 inches. Individual signal processors are included for each channel, selected according to requirements for each channel to be recorded.
Normal chart speed is 5.0 inches per minute giving a horizontal scale of approximately 1000 feet per inch.
A typical chart record is included with this appendix.
geoterrex
-
B. PROCEDURES
l ) Photo Laydowns:
Prior to undertaking of the survey, air photos of the area are obtained from which a photo laydown is produced, to an appropriate scale, usually 1" s 1320 feet. Proposed lines are drawn on the laydown, in the appropriate direction and line spacing. These "flight-strips" are then used by the air crew for navigating the airplane visually along the proposed lines. This photo laydown is also used to produce the subsequent base maps.
2) Aircraft Operation;
The air crew consists of pilot, co-pilot (or naviga tor) and equipment operator. The aircraft is flown along the proposed lines at a n altitijdj^oif-jj1ojjeBiJ2pi|Ofeet, using the flight strips for navigation. Altitudes in excess of 300 feet are generally considered too high for effective penetration.
The operator records lines, direction of flight and starting and finishing fiducial numbers on a flight log. Equipment is normally left on during the whole of the survey flight, while the intervalometer is turned on only for the actual survey line. Thus, the appearance of fiducial marks on the charts indicates the extent of the survey line.
3) Field Reduction;
Upon completion of the flight, the film is developed and the actual path of the aircraft is plotted on the photo laydo.wn. This is accomplished by comparing the film points with the photo. For any given point, the appropriate fid ucial number is placed on the photo laydown and the points joined to produce the actual flight path.
When field results are desired, anomalies are chosen and assigned appropriate fiducial numbers. The anomalies are then transferred to their correct position on the photo laydown.
geoterrex
-
4) Office Reduction;
On the completion of the survey, base maps are drawn using the photo laydown as a base. Flight lines and fid ucial numbers are shown on this base map*
In the case of EM or radiometric results the anomalies are then plotted on the base map as boxes with symbols representing anomaly grade or amplitude (as noted on the legend accompanying each map). Anomaly "systems" are then outlined as conductive zones at which stage geological comparisons and interpretation may be made.
In the case of magnetic results, the values noted on the Moseley chart are transcribed to a work sheet (overlay of the base map) after levelling or correcting for heading error, diurnal, etc* The values are then contoured on the work sheet and then drafted on a copy of the base map.
Since base maps use the photo laydown as a base, all geophysical results portrayed may be compared as overlays, and all features of interest may be identified on the appropriate photo for subsequent ground location.
geotera
-
GEOPHYSICAL — GEOLC 52Hi3SEee24 2.974 WHITEBIRCH LAKE TECHNICAL DA ..-...— ..
900
TO BE ATTACHED AS AN APPENDIX TO TECHNICAL REPORTFACTS SHOWN HERE NEED NOT BE REPEATED IN REPORT
TECHNICAL REPORT MUST CONTAIN INTERPRETATION, CONCLUSIONS ETC.
AUG3 1972PROJECTS SECTION
nf Combined Airborne-Electromagnetic, Magnetometer, Radiometric.
Township or Area Tommyhow Lake Area. W. Ontario Claim h~iH,.r(c) Labrador Exploration (Ontario) Ltd*
Author of Report Norgggrd2060 Walkley Road/ OTTAWA
Covering Dates of Survey . M g X 1 3 - J" ne 30,(linccutting to office)
Total Miles of Line cut
SPECIAL PROVISIONS CREDITS REQUESTED
ENTER 40 days {includes line cutting) for first survey.
ENTER 20 days for each additional survey using same grid.
Geophysical—Electromagnetic.—Magnetometer_—Radiometric———Other——————
DAYS per claim
Geological.
Geochemical.
AIRBORNE CREDITS (Special provision credits do not apply to airborne surveys)
tic 32,M. l(enter days per claim) f
Total claimable r 80 days per cla: DATE: July 28 f 1972jlGNATURE: fa
S iaW
ifa fa o
PROJECTS SECTION Res. Geol.
Checked by
GEOLOGICAL BRANCH.
Approved by. .date.
GEOLOGICAL BRANCH.
Approved by. -date.
MINING CLAIMS TRAVERSED List numerically
(prefix) (number)
79- 287728 incl.
.288553 incl .
302543.
.3.p..4.3.22.....-....304333...incl,.
309216 - 309276 incl.* 11 * * iii*^* * 11
•6 - 335999 inclX
TOTAL CLAIMS 185
-
Show instrument technical data in each space for type of survey submitted or indicate "not applicable"
GEOPHYSICAL TECHNICAL DATA
GROUND SURVEYSNumber of Stations—. Station interval.———— Line spacing————.Profile scale or Contour intervals.
MAGNETIC
Instrument .-——————————Accuracy - Scale constant — Diurnal correction method. Base station location——.—
.Number of Readings.
(specify for each type of lurvey)
ELECTROMAGNETIC
Instrument-———^——Coil configuration. Coil separation —— Accuracy————— Method: Frequency^^-^—
J
CU Fixed transmitter D Shoot back Inline D Parallel line
(specify V.L.F. station)
Parameters measured. GRAVITY
Instrument————.Scale constant.Corrections made.
Base station value and location.
Elevation accuracy.————————-——————INDUCED POLARIZATION - RESISTIVITY
Instrument^———~————^—————————Time domain. Frequency—— Power.————
Frequency domain. . Range.—————-
Electrode array.Electrode spacing. Type of electrode,
-
SELF POTENTIAL
Instrument.——————————————————————————————————————————— Range.Survey Method —.——-——————--—-^————^—--———-—-^—--.^—-^———.——————
Corrections made.
RADIOMETRIC
Instrument———Values measured.Energy windows (levels)——^—-—^—^^——^—^^———-—^—.^^—^—----—^^..^.—.^^.——
Height of instrument____________________________Background Count.
Size of detector————-——-—————-^————^--————.-——-—.——.^-.——.—-.^--. Overburden ̂ —^———-————.^————.———.——.^—-.—————————-^—.^——.^—-^^.-^—..-
(type, depth — include outcrop map)
OTHERS (SEISMIC, DRILL WELL LOGGING ETC.)
Type of survey-—-—————-———-———————-—^—-———————————Instrument —————-————.....-——.-———————.-——-————-———-—
Accuracy—Parameters measured.
Additional information (for understanding results).
AIRBORNE SURVEYS
Type of survcy(s)____
Arnirary. J ri-"-/ ^ : Cl^-^aJ ^ V^ (specify for each type of survey)
Aircraft ''
Sensor altitude 15Q - 2QQ 1Navigation and flight path recovery method - -^ '•'-PtyOiMt iK
lgC-^* R,Hn^ ** (MgQ^-')^ (fAircraft a.Ht..He ^ _______________________ LineMiles flown over total area ________________________ Over claims only
-
GEOCHEMICAL SURVEY - PROCEDURE RECORD
Numbers of claims from which samples taken.
Total Number of Samples- Type of Sample.
(Nature of Material)Average Sample Weight——————
Method of Collection——————-——
Soil Horizon Sampled - Horizon Development. Sample Depth———^ Terrain—————————
ANALYTICAL METHODSValues expressed in: per cent
p. p. m. p. p. b.
D Oa
Cu, Pb,
Others_
Zn, Ni, Co, Ag, Mo, As.-(circle)
Field Analysis (.
Drainage Development————————^^— Estimated Range of Overburden Thickness.
Extraction Method. Analytical Method- Reagents Used——
Field Laboratory AnalysisNo. ___________
SAMPLE PREPARATION(Includes drying, screening, crushing, ashing)
Mesh size of fraction used for analysis————
Extraction Method. Analytical Method - Reagents Used -——.
Commercial Laboratory (- Name of Laboratory— Extraction Method——
Analytical Method —— Reagents Used ————.
.tests)
.tests)
.tests)
General. General.
-
7File.
GEOPHYSICAL - GEOLOGICAL - GEOCHEMICAL TECHNICAL DATA STATEMENT
RCCE1VED
/VUG 3TO BE ATTACHED AS AN APPENDIX TO TECHNICAL REPORT
FACTS SHOWN HERE NEED NOT BE REPEATED IN REPORT TECHNICAL REPORT MUST CONTAIN INTERPRETATION, CONCLUSIONS ETC.
PROJECTS SECTION
t
TV™ nf an™™ Combined Airborne-Electromagnetic, Magnetoroeteri Radiowetric.
*", 4i,
*.
s t
iEbo
Tranship nr A^a ToBimyhow Lake Area, W. Ontariorfoini hnVr(s) Labrador Exploration (Ontario) Lt*
A,,th,u- rtf K^nrt P. NorgaarciAHHr.c, 2060 Ualkley Road, OTTAWAr^^gn^.fQ,,,,,^ May 13 - Juno 30, 1972
(linccutting to office)Total Miles of T.ine rut-.... . ..-..,.,.,.., ...,, , . ...,.,,.
SPECIAL PROVISIONS DAYS CREDITS REQUESTED r^i..,.;,-! ^ ——
—Electromagnetic — ..,.ENTER 40 days (includes line cutting) for first -Magnetometer ————————survey. — Radiomrtric. ,.. _ ..ENTER 20 days for each -Other ,...,,,,,,—additional survey using f;pnWi™lsame grid.
Opnrhprmoal , , ,AIRBORNE CREDITS (Special provision credits do not apply to airborne surveys)
Magnet"TTiPtPr32 ,65 Kleotr^rpapriPtir 32 .65 R^Hinmptrir32.65(enter days per claim) /J
Total claimable s 80 days perxcldim 0OATF.. July 2S, ISJTfiNATTIRR. /^ A-*-^~- ———— vX .
f Author of Report or Agent
PROJECTS SECTION Res. Genl. Qiialifiratinns
Previous Siirvpys
rihprkpH hy Hatp
GROI.Or,TnAT,KRAINjr;H
ApprovpH hy datf
nKninnrrAT RPAMPH
ApprnvpH hy d 3 tp
. MINING CLAIMS TRAVERSED List numerically
(prefix)
,..,26^14......287709 -
288^7^ .288301 -288552 -
288803 -
251859(number)
Jw^ir fiir U TT illOJL A
.^CJ^* .l ^j^J iftCi A
287728 incl.
29^?a Anfil*288314 incl.288553 incl.288822 incl.
WWW - 392j?5i AlWJl*304?g^ - 304333 insA.309216 .
^335996 -
\J36022 -
.......Irrz]
309276 incl.335999 incl.OOJtrtOO J M ** ) v^O W *r w Ai 7^ *L tmV'Jkjf
h—————
'TH'ru^Tvv^^ t^C^i^^t^-
TOTAL CLAIMSi 185
If space insufficient, attach list
-
Show instrument technical data in each space for type of survey submitted or indicate "not applicable"
GEOPHYSICAL TECHNICAL DATA
GROUND SURVEYS
Number of Stations_____________________________Number of ReadingsStation intervalLine spacing————-—————^——————-———————————————-—————^——Profile scale or Contour intervals -——^^——.-—---—--—-—-----————-^^^—^^^—
(specify for each type of survey)
MAGNETIC
Instrument .——^^————————.....———.^—.......——..^—^———Accuracy - Scale constant — Diurnal correction method. Base station location————
ELECTROM AGN ETIC
Instrument ——————Coil configuration. Coil separation ——. Accuracy______Method: CD Fixed transmitter Q Shoot back CD Inline Q Parallel lineFrequency—.————-—--—-—-—————-..-..^^^^^—,-——-.--^-—-..——..—...^^^—^^^-^—--—..——.--.—.—
{specify V.L.F. station)
Parameters measured————————————————————————————————————————————————————. GRAVITY
Instrument ———^^^^—^^—————-——————————————————-———-—————^—————^—-Scale constant.Corrections made.
Base station value and location.
Elevation accuracy—.————————-———.INDUCED POLARIZATION - RESISTIVITY
Instrument ———-——.-————-.———^—————.Time domain___________________________ Frequency domain. Frequency._____________________________ Range.———————
Power —————————————————————————————————————————————————Electrode array-— Electrode spacing. Type of electrode,
-
SELF POTENTIAL
Instrument..——-——————-—-———^———-—-—-—--—^—^———————————— Range.
Survey Method ———-—^—-—————-^—-—————^———————.—^^—-——^^—...—^——-.
Corrections made.
RADIOMETRIC
Instrument.
Values measured ——
Energy windows (levels).^-^^.————-.^———.—————.—^.^.—.———.—-—.^-—.^^—.^——^^
Height of instrument______________________________Background Count.
Size of detector————^^-————-———————^—.——^—^—..—-————-——--—.^—
Overburden —^———-^—^———^—^—^—^..^———^—^^^———^———-———^——^(type, depth — include outcrop map)
OTHERS (SEISMIC, DRILL WELL LOGGING ETC.)
Type of survey_____________________________________
Instrument ,^——^—^^—.^^^^^—^^^————^—^^—^—^^^^————
Accuracy_______.—--^^----—-^——^^—.^——-———^—————---—.
Parameters measured.
Additional information (for understanding results).
AIRBORNE SURVEYS
Type of survcy(s) ~ v
Instrumcnt(s)
(specify fofeach type of survey)Aircraft ..^H *ttor 1X10*3 with Oonodlort r^flittrction Cf^AYfvSensor aliiinHp 150 - 200'
Navigation and flight path recovery method ^06 Appendix
Aircraft ^..^150*200*_________________________ Line Sp.Hng Vt PU (HgOOVl)^, (E
Miles flown over total arca—*ir5?_______________________Over claims only
-
GEOCHEMICAL SURVEY - PROCEDURE RECORD
Numbers of claims from which samples taken.
Total Number of Samples. Type of Sample.
{Nature of Material)Average Sample Weight——————— Method of Collection—————————
Soil Horizon Sampled. Horizon Development. Sample Depth—————
Terrain—————————
Drainage Development.^————————— Estimated Range of Overburden Thickness.
ANALYTICAL METHODS Values expressed in: per cent
p. p. m. p. p. b.
Dn nCu, Pb,
Others—
Zn, Ni, Co, Ag, Mo, As.-(circle)
Field Analysis (~Extraction Method. Analytical Method- Reagents Used——
Field Laboratory AnalysisNo. —————————
SAMPLE PREPARATION(I ncl tides drying, screening, crushing, ash ing)
Mesh size bf fraction used for analysis ——-—
Extraction Method. Analytical Method . Reagents Used ——
Commercial Laboratory (- Name of Laboratory— Extraction Method—— Analytical Method —— Reagents Used .————-
.tests)
.tests)
.tests)
General. General.
-
TRIM UNE
Puddy Lake Area - M. 292089945'
49052'30'
h- CVJ
iOO)
a*c o
en o
(O D
49045—
^ f
.s- t . ,
-~ "TT" ii
. /-A/V ' * 0 l TO 258*
fm"" i B. TTB - ITS. 5*~ ' l
304O60 3O406I -H- ---t- ---l
TB. ™- l".
^•^7~~'"~(88284 268^83-1288282
334979 N 3349J* W4985 j 334988 334989 —- — — 4— — -f- —l — — — —r — — — -~l— ™~— "~ —l9 '
267727 K-r \J|2B77I9 287713
3040e7^ ^40M^ W40 4̂^^^287726 1287721 28\771B 287714
L - i* X28T722 l 287717 l677lg
"\ ,.^J
-49052*30'
89045'
K)
CJ
oQ)
O)
O
(O
^Oen
l
L- 49045'
89030'
Holinshead Lake Area-M.263l
AREA OF
WHITEBIRCH LAKE
DISTRICT OF THUNDER BAY
THUNDER BAY MINING DIVISION
SCALE: l-INCHrr40 CHAINS
LEGEND
PATENTED LANDCROWN LAND SALELEASES
LOCATED LANDLICENSE OF OCCUPATIONMINING RIGHTS ONLY
SURFACE RIGHTS ONLYROADSIMPROVED ROADS
KING'S HIGHWAYSRAILWAYSPOWER LINES
MARSH OR MUSKEGMINES
CANCELLED
C.S.
©Loc-L.O.
M.R.O. S.R.O.
•i" ."'rf Vi~maa
C.
NOTES
400' Surfoce Rights Reservation around all lakes and rivers.
NATIONAL TOPOGRAPHIC SERIES 52 H13
PLAN NO. M
b.k.497893
ONTARIODEPARTMENT OF MINES
AND NORTHERN AFFAfRS
S2H13SE0024 2.974 WHITEBIRCH LAKE 200
TRIM LINE
-
LEG
EN
D
EA
RLY
P
RE
CA
MB
RIA
N
Intr
usi
ve
Roc
ks
l Sg
S
yeni
te
(Gra
nitic
gn
eiss
with
les
s th
an
50X0
qu
art
z)
[0[
Gra
nite
(G
rani
tic
gnei
ss w
ith
over
I0
07o
qu
art
z)
Am
phi b
oli t
i c,
hyb
rid r
ock
s
Ga
bb
ro,
qu
art
z ga
bbro
, ga
bbro
—dio
rite
Pyr
oxen
ite
Volc
anic
R
ock
s
Undiff
ere
nt ia
ted
acid
to
int
erm
e d
10 t
e vo
lca
nic
ro
ck
V4 V9 vro
Rh
yolit
e
Dac
ite
Inte
rmed
iate
vo
lcan
ics
And
esite
Bas
alt
Tu
ff
Agg
lom
erat
e
NO
TE
: C
om
bin
ati
on
s
of
llth
olo
gic
al
sym
bo
ls
den
ote
tra
nc
ltio
na
t o
r m
ixe
d
va
rie
tie
s.
T h t
pre
do
min
ate
va
rie
ty
is
ind
ica
ted
by
the
f i r
st
sym
bol.
SU
FF
IX E
S
(indi
cate
st
ruct
ura
l, te
xtur
al a
nd m
iner
alog
ical
fe
a t u
res)
0
Pill
ow
ed
CD
Po
rph
yritic
A
Bre
ccia
ted
, fr
act
ure
d
Se
h i s
t os
e, g
ne
issi
c
cp
Cha
lc o
pyrite
py
Pyr
ite
po
Pyr
rho
tite
^
Quart
z ve
in
b B
iotite
j C
arb
onat
ized
l C
hi o
' t
zed
m
Am
phi b
oli T
i ze
d
n S
ilicifie
d
s S
en
c i t
ized
y P
yrox
en i
l i c
SY
MB
OLS
/o /
b /c
Ou
tcro
p
with
tr
ave
rse
no.
initia
l an
d o
utc
rop
no
Ge
olo
gic
al
conta
ct:
(a) lo
cate
d
(b)
assu
med
Str
ike a
nd d
/p o
f st
ratig
rap
hy:
top
un
kn
ow
n-(
a)in
clin
ed
(b)v
ert
ica
l(c
)un
de te
rm in
e d
to
p
know
n— (
a)in
clin
ed
(b
) vert
ical
a/.
Str
ike
and
d/p
of
folia
tion.
Str
ike a
nd
dip
of
join
ting:
'a'b
Dire
ctio
n o
f plu
ng
e o
r d
ip of
lineatio
n
Fault,
sch
ist,
bre
ccia
or
gouge z
one
(a) J
oco
fed
(b) a
ssum
ed
Fault
(solid
circl
e
indic
ate
s do
wnt
hrow
n si
de,
arr
ow
s in
dic
ate
re
lativ
e m
ove
ment)
Dra
g fo
ld (
arr
ow
indic
ate
s pl
unge
)
Dee
p b
ou
lde
r ov
burd
en
Sw
amp
Esc
arp
ment
Cla
im p
ost
: (a
)loca
ted
(b) a
ppro
xim
ate
a l b
O
-—-O
C
laim
b
ou
nd
arie
s
NO
TE
: H
igh
a
rea
s
ge
ne
rally
of
bould
er
ove
rbu
rde
n
an
d
mix
ed
fo
rest
unle
ss
no
ted
o
the
rwis
e
on m
ap
52
H1
3S
E0
82
4
2.9
74
WH
ITE
BIR
CH
LA
KE
V2Dcf*s
V5tl
,m,j
,y, (V9)
(VI.
V4.V
6.V7
)
TB 334988
TB 334986
TB 3349BO
TB 334987
TB 334982
Ott
nt
tf-
LABRADOR
EXPLORATION
(ONT
ARIO
) LIMITED
Febr
uary
21/7
3
TO
MM
YH
OW
L
AK
E
PR
OP
ER
TY
KO
OS
EL
-rR
OY
EX
O
PTI
ON
MA
GN
ETI
C
3* 4
5' E
GE
OLO
GIC
AL
PLA
NM
K
rem
ko
J S
inko
wsk
i
R O
Ha,
LO
CA
TIO
N
MA
P
Sca
le:
hi.
01
3,7
60
TH
UN
DE
R
BA
Y
MIN
ING
D
IVIS
ION
, O
NT
AR
IO
(c)
u nd
ete
r m in
e d
(a) i
ncl
ine
d(b
)verf
ical
(c) u
ndete
rmin
ed
(a) i
ncl
ined
(b) v
ert
i ca
l(c
) horizo
nta
l
-
'l s't O) c
r **
--r S! s. -. S;-^
r"
ra nj s
T *__
_: _
__
_ L
(•.Lim
n .1
^1
i
-— '
L ^-
-^T"
,j^
.--
-'"
-ft't
**T
—0
'
O
l-/-
*
Icf-j
c
— u
r — ™
" ——
"" ™"
^^^.,
,.w...
^. '
OD—
-"""'i
^ ; S
" r
'4^-
- "
r SI
w i
^*j
* [
d
W
—o
rorh
p
-
LOCATION MAP
89 D 30' ,50 0 OU
J f
.BO
LEGEND
500 GAMMAS . . . .
100 GAMMAS .
20 GAMMAS . . . .
MAGNETIC LOW . .
CONTOUR INTERVAL 20 GAMMAS
*230
AIRBORNE GEOPHYSICAL SURVEY
IV1AGIMETOMETER
TOMMYHOW AREA
ONTARIO
FOR
LABRADOR EXPLORATION (ONTARIO) LIMITED
SCA L E l inch ~- 1320 f eel \ / 4 m ile
geoterrex limitedOT TA WA
HOUSTON - T UCSON
LOWN IN MAY.I972 PROJECT No. 84 -I03