41JieSWee95 0026 ALBANEL010

REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY ELLIOT LAKE (MACE LAKE) AREA. ONTARIO. CANADA

RADIOMETRIC SURVEY23

ATLANTIC RICHFIELD CANADA LTD

r :

Jack C. Zahn Mining Geophysicist

October 1969. ASSESSMENT W ORK

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MM ALBANEL010C

TABLE OF CONTENTS

INTRODUCTIONPage

MAPSMap //l Time MapMap #2 Bismuth 214Map #3 rhalium 208Map /M Potassium 40Map //5 Gross Count Map

AUTHOR'S QUALIFICATIONS ...

APPENDIX A

RADIOLOGICAL SUBSYSTEMS

MAGNETIC "

NAVIGATION "

RECORDING "

ELECTROMAGNETIC "

(In Folder)

Page 5

6

7

8' 9

10

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February 17, 1970

REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY ELLIOT LAKE (MACE LAKE) AREA, ONTARIO, CANADA

ATLANTIC RICHFIELD CANADA LTD.

INTRODUCTION:

Between October 28 and October 30, 1969, an airborne geophysical

survey was conducted in the Elliot Lake (Mace Lake) Area, Ontario, by

Atlantic Richfield Canada Ltd.

Of the 700 line miles flown, 600 miles cover the actual claim

blocks in this report. The claims covered by this survey are located

In Townships 162, 163, 168 and 169, District of Algoma, Sault Ste.

Marie Mining Division, Ontario, Canada. The area is shown on Map l

which includes the complete outline of all the claim blocks.

The airborne survey was conducted for the purpose of mapping the

distribution of radioactive material in the area and distinguishing

between uranium, thorium, anil potassium sources. The geophysical

instruments used were supplied by EG&G, International, Boulder, Colorado,

and are outlined in Appendix A. The aircraft used to conduct the survey

was a Turbo-Beaver owned and operated by Atlantic Richfield Canada Ltd.

The airborne geophysical survey lines were flown in a north- south

and east-west direction with a line spacing no greater than one quarter

of a mile. The navigation and flight path recovery were accomplished

through the use of doppler radar navigation instruments. This equipment

is outlined in Appendix A. The survey was flown at an altitude of 400'-

and, at an average air speed of 100 miles per hour.

MAPS; '^ SSM-1407Flight Line Map (Time Map)

The locations of the flight lines are shown on the time map. The

scale of this map is l' s 1,320'. The survey was flown in two directions

REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY ELLIOT LAKE (MACE LAKE) AREA, ONTARIO, CANADA

ATLANTIC RICHFIELD CANADA LTD.

INTRODUCTION:

Between October 28 and October 30, 1969, an airborne geophysical

survey was conducted in the Elliot Lake (Mace Lake) Area, Ontario, by

Atlantic Richfield Canada Ltd.

Of the 700 line miles flown, 600 miles cover the actual claim

blocks in this report. The claims covered by this survey are located in

Townships 162, 163, 168 and 169, District of Algoma, Sault Ste. Marie

Mining Division, Ontario, Canada. The area is shown on the maps that

accompany the report and includes the complete outline of all the claim

blocks.

The portion of the airborne survey covered by this report was

conducted for the purpose of mapping the local magnetic and the very' low

frequency (VLF) anomalies. The VLF receiver used was supplied by

McPhar Geophysics Limited, Don Mills, Ontario and is outlined in

Appendix A. The magnetometer used was supplied by EG&G, International,

Boulder, Colorado, and is outlined in Appendix A. The aircraft used to

conduct the survey was a Turbo-Beaver owned and operated by Atlantic

Richfield Canada Ltd.

The airborne geophysical survey lines were flown in a north-south

and east-west direction with a line spacing no greater than one quarter

of a mile. The navigation and flight path recovery were accomplished

through the use of doppler radar navigation instruments. This equipment

is outlined in Appendix A. The survey was flown at an altitude of 400'i

and at an average air speed of 100 miles per hour.

SSM- 1407

-2-

Data Reduction

The VLF data were displayed using a profile format. The profiles

were examined and the VLF anomalies were recorded on the map as small

dots. VLF anomalies that were coincident with magnetic anomalies were

mapped as large dots. VLF anomalies are indicative of a relative increase

in the conductance of the near-surface rocks. The coincidence of magnetic

and VLF anomalies may be indicative of base metal mineralization.

The magnetic data is contoured by computer programming. The Earth's

normal field is removed from the total intensity profiles as recorded in

the field. These resultant data (in line form) are tied by a minimization

technique to provide a smooth, continuous surface that describes the local

magnetic field. This is t3 - In two basic steps, (1) vertical datum

shifts (systematic errors) are determined to minimize mis-ties at all line

intersections, (2) the remaining mis-ties (random errors) are then removed

by being distributed between intersections along the data lines. During

this adjustment process, certain of the data lines may be completely

removed if these lines fail to meet statistical requirements based on the

variance of the mis-ties of the individual lines.

The adjusted set of magnetic profiles is now ready for gridding prior

to contouring. This gridding is accomplished by a proprietary line-oriented

gridding program. The basic requirement is that the survey be flown with

flight lines approximately parallel and more or le"s evenly spaced. The

grid mesh is usually taken as the average line spacing but may be set at

any fixed value. The gridded output is then contoured at an appropriate

contour interval.

i ', M "V tL -:t V' i

-3-

Aeromagnetic Map

The scale of this map is l" = 1 ,320 feet at. l the contour interval is

10 gammas.

There are four major linear features exhibited on this map. The

First lies south of Lease Area 0-41 and Lease Area 0-42 and trends in

a west-northwest direction. This feature is the magnetic expression of a

fault and/or a diabase dike. The second linear feature is oriented east-

northeast and extends through Lease Area 0-35 north of Lease Area 0-36

and intersects the northwest corner of Lease Area 0-32. This is the

magnetic expression of a portion of the Nipissing Diabase. The third

linear feature is situated across the northwest corner of this map. It

extends from Claim Block 103403 through Claim Block 103414, Lease Area

0-44, and through the contoured magnetic maximum located in the vicinity

of the word ( "Township 169." This magnetic maximum trend is the expression

of the fault chat parallels the Little White River. The fourth and

final linear maximum trend located in this area extends through the

feature located in Claim Block 80784 and Claim Block 80798 on the Cominco

Area, Township 162; thence northwest through the maximum at Claim Block

95125, Lease Area 047, thence through the maximum south of Claim Block

84000, Lease Area 0-36, Township 168, thence in a northeastern direction

through the magnetic maximum located in Cluim Blocks 84064 and 84054,

Lease Area 0-32. This feature appears to be associated with the

syncline that trends northwest-southeast across the northeast portion of

this map. It is probably a mineralized faulted zone lieing close to the

surface.

VLF Anomaly Map

The scale of this map is l" = 1,320 feet. The small dots indicate

SSM-1407

-4-

VLF anomalies and the large dots indicate VLF anomalies with aeromagnetic

anomalies coincidences.

The only group of VLF anomalies of any interest are located in Lease

Area 0-47, Township 162. These anomalies appear to be associated with

the magnetic anomaly that is structurally controlled by the local syncline.

The remaining anomalies indicated on this map have no relationship to any

major magnetic trend.

Jack C. Zahn, Mining Geophysicist

SSM-1407' l

-5-

Author's Qualifications - Jack C. Zahn

Graduated with a B.S. in Geology in 1961 and a M.S. in Geology with

a specialty in geophysics in 1965. Both degrees from the Ohio State

University, Columbus, Ohio.

Employed as a consultant geophysicist from 1962-1965 with

George H. Mayhew Si Associates, Powell, Ohio. Projects worked on during

this period were in the fields of highway design geophysics; engineering

design geophysics, both bridge and dam site, and hydrology. Operations

were conducted in the midwest and the province of Ontario, Canada.

From 1963-1965 employed by the Ohio State Engineering Experiment

Station, Ohio State University,and conducted research with and the

evaluation of geophysical tools and techniques to fee used to solve

engineering problems.

From 1965 to the present, employed as a geophysicist by the Atlantic

Richfield Company, From October, 1968 to the present, being employed in

the field of uranium exploration and airborne geophysical techniques.

Jack C. Zahn Mining Geophysicist

-6-

MAGNETIC SUBSYSTEM

The Varian type V-4937A Transportable Magnetometer is operated* - *

in a fixed mode (stinger installation). The magnetometer read out

is directly in gamma in the range of 20, 000 to 100, 000. The slow

mode read out of l second is employed, giving l gamma sensitivity.

A nominal 28V DC power is obtained by operating directly of f the

aircraft battery.

-7-

ELECTROMAGNETIC SUBSYSTEM

The McPhar airborne KEM system using VLF transmission from Cutler,

Maine, 17.8 KHa, as the primary field was operated aboard the Beaver

airdraft. In the absence of conductors, the electromagnetic field is

horizontal and constant in amplitude. A conductor will distort the

horizontal field and often change the amplitude of the received signal.

The KEM system continuously measures the dip of the resultant field in

degrees and may be regarded as a vertical loop system with the trans

mitter located at infinity.

j^* *xv t -- -

-8-

RECORDING SUBSYSTEM

Data are recorded in a digited and analog mode. The principal recorder

is a 7 track Digi-Data Model 1420. The input rate is 0-200 characters

per second. The packing density is 200BPI. The power required is

110V 60cps. A Non-Linear Systems Model 2710 Tape Verifier produces

one full data word every minute to verify the recorded data. Data from

all systems are recorded on a one second basis.

The analog recording system provides a visual display of altitude, mag

netic field, count rate of three isotopes, and gross radiation. These

data are recorded on a six track MFE Strip Chart Recorder that operates

on 110V at 60cps.

-9-

NAVIGATIONAL SUBSYSTEM

The navigational system consists of a GPL Division GPK - 1000

Doppler Navigation Radar Set, Kearfott Gyro Guide Compass System,

Honeywell Electronics Altimeter Set Y G 9000D, and an Automax G 2

camera for a backup system.

GPK - 1000 Doppler Radar Set

Operational Limits

Altitude - from 40 Ft. to 50, 000 Ft. over land or water with

sea state greater than Beaufort 1.

Groundspeed - 80 - 800 knots.

Drift Angle - o0 - 40" right or left.

Temperature - operational from -540 C to 710 C.

Pitch Attitude - 25" nose up or down.

Accuracies (50*fc probability)

Groundspeed - 0. IV/o 4- 0. 35 knots.

Drift Angle - 0.170

Power requirements are 115V at 400cps and 28 V DC.

Kearfott Gyro Guide Compass System

The error of the output signal with reference to gyro heading is

less than l0 . The error of the output signal with reference to

compass transmitter reading when compensated is also less than l0 .

Honeywell Electronic Altimeter Set YG 9000D

This system has an altitude accuracy of * 5ft. * Sfo of actual

altitude. The power requirements are 115V at 400cps and 28V DC

Automax G 2 Camera

This 35 mm airborne camera is used as a back up for the Doppler Radar

Set. In normal operations the camera is triggered on a frame every- ' f :~ - . . '

two seconds basis. Power requirements are 115V at 60cps and 28V DC.

-2-

with flight lines oriented north-south and east-west.

Radiometric Maps

General

All of the contoured radiometric maps have been produced by computer

programming. In order to facilitate 'the contouring program, the data

were subjected to smoothing filters. The weighted formula for this

operation on the Bi2i4 and K/io Maps is:

.2Z + .4Z +.7Z + Z + .7Z + .4Z +.2Z zi z i-3 i-2 i-1 i i+1 i+2 i+3

i+2 (.7* 4-f 2)

The weighted formula for this operation on the T1208 and Gross Count map is:

Zi = . 4Z i -

The lowest contour lines have been deleted from each of the radio

metric maps. Thus, the features contoured represent only those anomalies

that arc of a high grade.

The radiometric data have been corrected for background radiation,

Compton Effect and altitude deviation. These operations were performed

on the data at the computer.

Map # 2 Bismuth 214

The scale of this map is l" ^ 1 ,320'. The contour interval is 2 cps

with the lowest contour line at 8 cps.

There are two prime anomalies on this map. The largest is located

on Claim Block 84232, Lease 0-36, Township 168. The second anomaly is

located north of Claim Block 103414, Lease 0-44, Township 169. This

latter anomaly is located along an anomalous trend that is oriented

northeast-southwest and extends across the northwest corner of this map.

14: O -^

-3-

There arc other scattered anomalous areas in Leases 0-29, 0-47, 0-28, in

Township 162.

Map #3 Thallum 208

The scale of this map is l" ^ 1 ,320'. The contour interval is l cps

and the lowest contour line has a value of 4 cps.

There are three major anomalous areas on the Thaliunt Map. The first

and most important lies along a northeast- southwest trending anomalous area

located in the northwest part of the map. This is the same feature that

was seen on the Bismuth Map. The maximum anomalous highs are located

in Claim Blocks 103414, 103413, east of 103406, in Lease 0-44, Township

169, and southwest of Claim Block 10744, Lease 0-41, Township 168.

The second anomalous area is located in Claim Block 84232, Lease

0-36, Township 168. The third anomalous area is located in Claim Block

98838, Lease 0-28, Township 162.

There is a low grade anomaly that trends cast-west through Leases

0-48, 0-31 and 0-29 of Township 162.

Map #4 Potassium 40

The Potassium Map shows four anomalous areas. The major anomalous

trend is located through Leases 0-48, 0-31, and 0-29 of Township 162.

This trend .that is oriented in an east-west direction, is also represented

by an anomaly positioned north of Claim Block 103824, Lease 0-45,

Township 162. This latter anomaly is actually in the southwest corner

of Township 163. The second anomalous area is located across Lease 0-28,

Township 162 and appears to be oriented in a northeast-southwest direction.

.'' ''' ' ' ' ' ' ' '' '""'''' :'"': ' " ' ' "' "•'•'^''•'•' i'*' J-'- ' *~*''

-4-

The third anomalous area is locate*' in the vicinity of Claim Blocks 80784

and 80785 of the Cominco Lease, Township 162.

The last anomalous trend is oriented northeast-southwest and lies

across the northwest corner of this map in Townships'169 and 168.

Map #5Gross Count Map

The scale of this map is l" = 1,320'. The contour interval is

200 cps and the lowest contour line has a value of 2,200 cps.

There are five gross anomaly trends located on this map. The

longest trend is located in the northwest section of the map, is oriented

northeast-southwest and passes through Townships 168 and 169. This is

the same trend that was seen on the Bismuth and Thalium Maps. The

largest anomalies are located in Claim Blocks 103414, 103413, and

103406, Lease 0-44, Township 169; Claim Block 103426, Lease 0-43,

Township 169; and Claim Block 91714, Lease 0-35, Township 168. The

second and steepest is located in Claim Block.84232, Lease 0-36, Township

168. This anomaly was noted previously on the Bismuth and Thalium

Maps. The third anomalous area is located in Claim Block 34000, Lease

0-36, Township 168. The fourth anomalous area on the Gross Count Map

is located on a trend from Claim Block 98839, Lease 0-28 through Claim

Block 96099, Lease 0-46, Township 162. The last anomalous area is

located through and around the Cominco Lease area in Township 162.

It appears that the anomalies located along the northwest section

of the map and in the vicinity of Claim Block 84232, Lease u-36,

Township 108 warrant a geophysical or^a geological ground survey.

Jack C7 Zann, Mining Geophysicist

- 5 -

Author's Qualifications - Jack C. Zahn

Graduated with a B. S. in Geology in 1961 and a U.S. in Geology with

a specialty in geophysics in 19G5. Both degrees from the Ohio State

University, Columbus, Ohio.

* Employed as a consultant geophysicist from 1962-1965 with

George H. Mayhew fc Associates, Powell, Ohio. Projects worked on during

this period were in the fields of highway design geophysics; engineering

design geophysics, both bridge and dam site, and hydrology. Operations

were conducted in the midwest -and the province of Ontario, Canada.

From 19G3-1965 employed by the Ohio State Engineering Experiment

Station, Ohio State University,and conducted research with and the

evaluation of geophysical tools and techniques to be used to solve

engineering problems.

From 1965 to the present, employed as a geophysicist by the Atlantic

Richfield Company. From October, 1968 to the present, being employed in

the field of uranium exploration and airborne geophysical techniques.

Jack C. Zahn Mining Geophysicist

SSM-1407

- 6 - -

RADIOLOGICAL SUBSYSTEMS

The radiological subsystem is made up of two component parts; the

detectors and the analyzers.

Detectors

The detector package is made up of two arrays of seven crystals each.

The detectors are supplied by Harshaw Chemi cal Company, and con-t

sist of a 4" diameter x 4" thick thallium activated sodium iodide crystal

hermetically sealed in an aluminum container and optically coupled to a

3" RCA photomultiplier tube with a low background tube base assembly.

The detectors have a resolution of 8. 57o with Cesium 137.

Analyzers

Technical Instruments, Inc. Model 404C Pulse Height Analyzer

The Model 404C has 400 Channels with a maximum input rate up to

50, 000 cps with negligible spectrum distorsion. The spectrum rangeg is 3MeV. The memory capacity is 10-1 counts per channel.

Power requirements are 115V at BOcps.

EG&.G Four Channel Pulse Height Analyzer

The windows in this analyzer are set to record:

Gross Radiation (lOOKeV to 3. OMeV)

K40 (1. 37MeV - 1. SOMeV)

Bi214 (1. 65MeV - 1. 88MeV)

Tl208 (2. SOMeV - 2. 74MeV)

The data processor counts the pulses in each of these windows and this

information is read out each second.

Power required is 15V and 19V DC.

- 7 -

MAGNETIC SUBSYSTEM

The Varian type V-4937A Transportable Magnetometer is operated

in a fixed mode (stinger installation). The magnetometer read out

is directly in gamma in the range of 20, 000 to 100, 000. The slow

mode read out of l second is employed, giving l gamma sensitivity.

A nominal 28V DC power is obtained by operating directly off thet

aircraft battery.

- 8 - -

NAVIGATIONAL SUBSYSTEM

The navigational system consists of a GPL Division GPK - 1000

Doppler Navigation Radar Set, Kearfott Gyro Guide Compass System,

Honeywell Electronics Altimeter Set Y G 9000D, and an Automax G 2

camera for a backup system.

GPK - 1000 Doppler Radar Set .

Operational Limits

Altitude - from 40 Ft. to 50, 000 Ft. over land or water with

sea state greater than Beaufort 1.

Groundspeed - 80 - 800 knots.

Drift Angle - o0 - 400 right or left.

Temperature - operational from -540C to 710 C.

Pitch Attitude - 25C nose up or down. *

Accuracies (50*7o probability)

Groundspeed - 0.177o -i- 0. 35 knots.

Drift Angle - 0.170

Power requirements are 115V at 400cps and 28 V DC.

Kearfott Gyro Guide Compass Sy?* .n

The error of the output signal with reference to gyro heading is

less than l0 . The error of the output signal with reference to

compass transmitter reading when compensated is also less than l0.

Honejwell Electronic Altimeter Set YG 9000D

This system has an ?,ltitude accuracy of ^ 5ft. -*- 3fo of actual

altitude. The power requirements are 115V at 400cps and 28V DC

Automax G 2 Camera

This 35 mm airborne camera is used as a back up for tlie Doppler Radar

Set. In normal operations the camera is triggered on a frame every

two seconds basis. Power requirements are 115V at GOcps and 28V DC.

- 9 -

RECORDING SUBSYSTEM

Data are recorded in a digited and analog mode. The principal recorder* . .

is a 7 track Digi-Data Model 1420. The input rate is 0-200 characters

per second. The packing density is 200BPI. The power required is

110V GOcps. A Non-Linear Systems Model 2710 Tape Verifier produces

cue full data word every minute to verify the recorded data. Data fromt

all systems are recorded on a one second basis.

The analog recording system provides a visual display of altitude, mag

netic field, count rate of three isotopes, and gross radiation. These

data are recorded on a six track MFE Strip Chart Recorder that operates

on 110V at GOcps.

•t-#-:\.' . -'.v"'"V;-7, , - ."' ',:?'--

- 10 - :."' : v;;x^-v! : , ,- ' -. ' . " -

ELECTROMAGNETIC SUBSYSTEM

The McPhar airborne KEM system using VLF transmission from Cutler,

Maine, 17.8 KHa, as the primary field was operated aboard the Beaver

aircraft. In the absence of conductors, the electromagnetic field is

horizontal and constant in amplitude. A conductor will distort thel ,

horizontal field and often change the amplitude of the received signal.

The KEM system continuously measures the dip of the resultant field in

degrees and may be regarded as a vertical loop system with the trans

mitter located at infinity.

""' :^''^"^'"v^'"" : ' ' :"" ; - "- ' " '••'~'*.'-'~?f'-i? ^Kf^f^~ .'s;r-?:JW;. ! :.;-..-.-V' •.^"-.•^"sfK^:

AtlanticRichfieldCanadaLtd. Uranium Exploration and Development Suite 1410 Prudential Building 4 King, Street West Toronto l, Ontario, Canada Telephone 416 363 3228

R. D. Rsmsey District Geologist

June 23, 1970.

Mr. F. Matthews Special Projects Department of Mines Parliament Buildings Toronto, Ontario.

Dear Sir: ••86 ALBAHEL900

Enclosed please find two copies each of a geophysical report covering airborne radiometric survey, airborne magnetometer and EM surveys on 226 claims (listed on the attached shnnt) in Townships 162, 168 6 169, Sault Ste. Marie, Ontario, together with a shest giving the geophysical airborne survey costs.

Report of Work forms were submitted to Mr. D. A. Jodouin, Mining Recorder, Sault Ste. Marie and acknowledgement of the filing of this work was received by way of Mr. Jodouin's letters of June 4th and June 15th 1970.

D. S. McPheeActing District Geologist

Enclosure

SEP 28 1970

RESIDENT GEOLOGISTSAULT STE. MARIE

SSM-

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GEOPHYSICAL AIRBORNE SURVEY COSTS

Project Name Elliot Lake (Mace Lake) -Project Code 006Flight Dates 28 Oct - ?0 Oct 69Total Flight Line Miles 700Total Flight Line Miles in Government Claim Area 600

Contract equipment rental: 3 .days @ 3 655-74 /day ***

Contract flight line recovery ' 7oo miles @ S 200 /wile s

S 1,967.22

1,400.00

Contract programmer time:

Contract computer time:

Contract plotter time: ^

2. s days @ S 150.00 /day a

Contract systems operator expense:

Aircraft rental: ____ig hours,

40 hours 6 3 125.00 /hour

4^0 hours @ 3 50.00___/hour

______ days @ 3^^ /day

35 minutes @ S /hour

ARCo programmer time:

ARCo computer time:

ARCo drafting time:

7.5 days Q 3 50

3___ hours, ^^

/day *

58 minutes 150.00/hour

____3 days @ .^^—.———

ARCo photo reproduction ~ 75.00

ARCo geophysical evaluation: ___ 2__ days @ S 52.00 /day s

ARCo plotter: ____8

Reproduction costs:

Mobilization charges:

hours @ S 25.00 /hour s

Mobilization charges, Canada:

VLF rental: 3

7 % of $19,408.97

days @ S71.42______/day

Mosaics/maps

375.00

500.00

200-OO

160.97

1.672.50

375.00

595.00

75.00

75. OO

1M .OP

200.00

1.358.63

214.26

C ;Total Cost

Cost/Mile *

SSM-.I407

9.272.58

S 13.25

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MACE LAKE PROSPECT. ONTARIO 226 CLAIMS

CLAIM NO

SSM 83994 - 84003 inclusive

SSM 84022 -39 "SSM 84045 - 75SSM 84215.- 32 "

SSM 88806 - 08 "

SSM 01706 - 21 "

SSM 91974

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" "

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SSM 92428 - 29 SSM 92476 - 77

SSM 94226 - 27SSM 94229SSM 94728 - 30

SSM 95109 - 10 SSM 95124 - 25 SSM 95170 - 71 SSM 95172

SSM 96005 SSM 96009 - 10 SSM 96095 - 96 SSM 96159

SSM 97843

SSM 98154 SSM 98159 SSM 98682 SSM 98814 - 24 SSM 98832 - 55

SSM 99018 - 25 SSM 9 9078 - 89

SSM 101744 - 45

SSM 103393 - 103430 " SSM 103824 - 30 "

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