53C12SEea01 2.483 KENNEDY LAKE 010

QUESTOR SURVEYS LIMITED

AIRBORNE GAMMA RAY SPECTROMETER SURVEY

AREA 1970 - 36B

HORNBY LAKE AREA

ONTARIO

PREPARED FOR

COCHENOUR EXPLORATIONS LIMITED

SEPTEMBER 1970

2

The gamma ray spectrometer channels show an increase

in the count rate upwards and the altimeter channel shows an in

crease in terrain clearance upwards. The altimeter scale is not

linear; an example is shown at the end of this report.

SURVEY PROCEDURE

An approximate speed of 90 miles an hour was used at

a terrain clearance of 250^ .feet^,^^...^.fjrsa.l^S^p.attern f licfht upath

with 1/2 mile turns was employed. An equipment operator mon

itored the instruments and logged the flight details. Navigation

al mosaics at a scale of l" ~ 1/4 mile were used for control.

MAP COMPILATION

The base maps are uncontrolled mosaics constructed from

l" - l mile National Air Photo Library photographs. These mosaicsi

were reproduced at a scale of l" * 1/4 mile on stable transparent

film from which white prints can be made.

The profile maps are on white transparent overlays.

Flight path recovery was accomplished by comparison of

the prints of the 35 mm camera film with the mosaic in order to

locate the fiducial points.

DATA PRESENTATION

Symbols used to designate the uranium anomalies are

shown on each map sheet. Widths of the anomalies have been

approximated by taking 1/2 peak width points of the anomaly curve.

Narrow anomalies are represented by the anomaly symbol alone

since 1/2 peak width points would lie within the bulls-eye symbol.

All the anomalies are listed on data sheets at the end of this

report. In addition to the positions, widths and values of the

uranium anomalies, also listed are the corresponding thorium,

potassium, total count and altimeter values. A circle around the

bulls-eye symbol indicates a uranium-thorium ratio equal to or

greater than 2. Uranium and thorium profiles have been plotted

along the flight lines on an overlay. The uranium and thorium

values have been squared.

- l -

INTRODUCTION

Questor Surveys Limited performed a gamma ray. jt"ftjjL.j;w,* ;' j i*ytKv*eswf^'?^{!K?v?fs:.|Wi)~~ip''*"**ii'!'; __

spectrometer survey totalling J 30 line miles in the Hornby

Lake Area on August 23, 1970.

A Beaver^ (CF-JKG) on floats was utilized for the

survey and the operating base was Deer Lake, Ontario. A' -. ,,.,. ,.-, . .- ..-* .~-.~-"--"~ ---'' -' '-*--"~^-^~j *--~'-.^^w-t^ito^^

line^ seeing ,jD.CH^8.,J5yvl^JKaiMJJse^j An area outline' is shown

at the end of this report; this is part of the National Top

ographic Series sheet number 53C.

EQUIPMENT

The aircraft was equipped with an^Ej^^^j.ajj^^.

^l^:^^^

.^and a Bonzer radar altimeter was used for ver

tical control. The outputs of these instruments together .

with fiducial timing marks were recorded on an MFE (Mechanics

for Electronics) recorder using heat sensitive paper. A

35 mm continuous strip film camera was used for recording

the actual flight path.

Three 6" x 4" Sodium Iodide crystals were used to

detect the gamma rays, and a source of cesium 137 was used

as reference ; f ;or the s^pjectrum stabilizer. The window widths

of the differential analysers were set at 12 IT'2% of the en

ergy peaks of bismuth 214, thallium 208 and potassium 40.

For example, bismuth 214 has an energy peak of 1.76 Mev and

therefore the window width is 2.20 Kev.*

The sensitivity of the potassium, thorium and

uranium channels was set at l cm = 2 0 count/second and the

total count at l cm ~ 160 counts/second.

A time constant of two seconds was used. Spectral, ^-...,,,^,,.. 1 - -;-----^;-r;.-.r^"r.:-^ i i - *~ : -~-^ -.-^.---V™ ri*f -~i;k-^ ~.:-i i V^ -^ *-

interaction was eliminated by the use of subtraction circuits,

The channel positions from top to bottom are:-

Al t i me le r Total Count Thor j u;;t Urani urn Potassium

— 3 —

RESULTS

It has been shown in several case histories that

uranium-thorium and uranium-potassium ratio maps are extremely

helpful in the discrimination of uranium anomalies. Care must

be taken, however, that discrimination is used only to eliminate

outcrop and not legitimate uranium anomalies with thorium and/or

potassium association. It has been proven that the count rate

of potassium and thorium generally increases sympathetically with

the uranium count. Anomalies may also result when altitude de

creases. These, however, are easily recognized and can be elim

inated.

Anomalies arise from several sources. One of these is

from actual deposits of uranium or pitchblende. Others may result

when passing over boulder fields, or when passing over outcrop

after flying over covered areas. Geologic contacts may also be

spotted such as between sandstone and granite. The background

is much higher and more erratic over granitic areas.

As mentioned earlier, the high ratios of U-Th and U-K

are important and they could well indicate a deposit of uranium

or pitchblende. In addition, however, small subtle changes in

the uranium count rate may be significant in that they may indicate

an interesting area where no specific anomalies have actually been

picked up. The aircraft has to pass directly over a deposit to

obtain maximum results. Thin covers of overburden may also re

flect the rock,... tyjpes o betowf the surface which is the reason that

the background . feedings do not fall. : to the minimum over covered

areas.

BRIEF DESCRIPTION OF THEORY INVOLVED—————————————————————————————————— }

Uranium 238, uranium 235 and thorium 232 are long lived

alpa emitters and together with potassium 40 {gamma emitter), they

contribute all the natural environment radiation.

Uranium 238 is measured indirectly from bismuth 214

which is a gamma emitter. Similarly, thorium 232 is measured in

directly from thallium 208, also a gamma emitter. Bismuth 214

- 4 -

and thallium 208 are daughter products of uranium 238 and thorium

232 respectively. Potassium, however, is measured directly from

potassium 40.

Bismuth 214 and thallium 208 were selected because their

energy peaks are above the l Mev level and in airborne applications

energies below l Mev are difficult to resolve. Equilibrium in

the decay series must be-present in the U and Th series to give

an accurate indication of uranium and thorium. This equilibrium

is assumed to be present in our surveys as no indication to the

opposite has evolved.

Detection of gamma rays is by means of the Sodium Iodide

thallium activated crystals which emit light when a gamma particle

is absorbed by them. Photo multiplier tubes pick up the light and

produce electric pulses which are proportional to the incident

light. These electric pulses are integrated and recorded on.the

analog chart.

Discrimination to the various channels is by means of

the gated windows which are positioned to sample the energies of

potassium, thorium and uranium.

DISCUSSION OF THE RESULTS

In general, the profile maps correspond favourably with

the anomaly map. To accentuate the anomalous zones and suppress

the background, the thorium and uranium values have been squared

and plotted on a scale of l" ** 4 00 counts/second. This present

ation facilitates the selection of anomalies for ground investi

gation and could possibly extend the known occurences of U^Og.

Since the client is more familiar with the geology in the area

concerned and with the occurences of l^Og , no attempt ,4-S made by

the writer to discriminate the uranium anomalies and make specific

recommendations for a ground investigation programme.

It is suggested, however, that a correlation be made

with the known deposits and the gamma ray spectrometer survey to

select other anomalies which are similar. It is felt that the

most important uranium anomalies are those that do no have a

- 5 -

corresponding thorium response. This, however, should be sub

stantiated with the knowledge that is in the hands of the people

making the investigation.

Since the anomalous areas are small in extent, it is

recommended that all of the anomalous zones be given an investi

gation on the ground.

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TELEPH!807817 b 818 53C12SE0801 2,483 KENNEDY LAKE

ONTARIO

900

DEPARTMENT OF MINES AND NORTHERN AFFAIRS

J'Yed W. Matthews, Supervisor, Projects Section, Ontario Department of Mines, Whitney Block, Parliament Huildings, Toronto.

MINING LANDS BRANCH OFFICE OF THE MINING RECORDER

June 21, 1971

JUN231*"

SECTION

P !: C F l V F f")I fc ir-. Vrf* {--W l V I., l -'

MINING LANDS BRANCH

NOTIFICATION OF RECORDING OF ASSESSMENT WORK CREDITS

Dale of Recording of Work

Recorded Holder

Township or Area

........ June. 17,. 197J.

.... ppin. Lake. told. Mines.

Cochenpur, Ontario(address)

Hprnby. Lake. Area M.2172. &1. Kennedy. Lake. Area.M,?029.

'I'ype of Survey and number of Assessment Days Credits per claim

GEOPHYSICAL Airborne [ji Ground l

Magnetometer . . . . . . . . . . . . . . days

I'ilectroinagnetic . . . . . . . . . . . . . days

Radiometric . . . . . rf. . . . . . . . . days

.. . . . . .. . . . . . . . .. . . . . .. . . days

GEOLOGICAL. . . . . . . . . . . . . . . . days

GKOCIIKM1CAL . . . . . . . . . . . . . . days

SKCT1ON 8-1(1-1) . . . . . . . . . . . . . days

NOT1CK 'I'O RKCORDKD HOLDER

i l Survey reports and maps in duplicate must be submitted to the Projects Section, Toronto within 60 days from the date of recording of this work.

Reports and maps are being forwarded to Projects Section with this letter.

Mining Claims

KRL.201850 - 201865 iKRL. 237358 - 237414 incl.Hw k?-M/KRL.237417 - 237422 incl. /iKRL. 280565 - 280576 incl. J v;l ^ h

-i70

.^Alining Recorder,

c.c. Coin Lake Gold Mines Limited

PR'OJECTS SECTION

ONTARIO

DEPARTMENT OF MINES AND NORTHERN AFFAIRS

TECHNICAL ASSESSMENT WORK CREDITS

Recorder Holder

Township or Area

. . . .Coin .Lake

. . . .Hornby .

M4-.

Type of Survey and number of Assessment Days Credits per claim

GEOPHYSICAL

Magnetometer ....................................days

Electromagnetic .................................days

Radiometric ...................2.3..,. ............days

Man days LJ

Special Provision

Ground

Airborne

NOTICE OF INTENT TO BE ISSUED

l l Credits have been reduced because of partial coverage of claims.

fy] Credits have been reduced because of xxsgR^H^sxf^^^KxgsKJSxaflfif figures of

applicant.

NO CREDITS have been allowed for the following mining claims as they were not sufficiently covered by the survey:

Mining Claims

KRL 201850 to 65 incl.

237358 to 414 incl.

237417 to 22 incl.

280565 to 76 incl.

The Mining Recorder may reduce the above credits if necessary in order that the total number of approved assessment days recorded on each claim does not exceed the maximum allowed as follows: Geophysical - 80; Geological 40; Geochemical 40;

Kennedy Lake Area - M. 3029930 45'

520 30—

OJrooro

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52 0 22'30"—

930 30'

Hornby La k o

•52 0 30'

29

28

27

26

25

24

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520 22'30"

43 42 41 40 39 38 37 36 35 34 33 32930 30'

Culverson Lake Area - M. 282053C12SE00ei 2.483 KENNEDY LAKE 200

524933

AREA OF

HORNBY LAKE

DISTRICT OFKENORA

(PATRICIA PORTION)

RED LAKE MINING DIVISION

SCALE: l -INCH :^4O CHAINS

LEGEND

PATENTED LANDCROWN LAND SALE

LEASES

LOCATED LANDLICENSE OF OCCUPATIONMINING RIGHTS ONLY

SURFACE RIGHTS ONLYROADSIMPROVED ROADS

KING'S HIGHWAYSRAILWAYS

POWER LINES

MARSH OR MUSKEGMINES

CANCELLED

C.S

Loc.

L.O. M.RO.

S.ftO.

?X c.

NOTES400' Surface Rights Reservation around all lakes and rivers.

J,

DATE OF ISSUE

JUL - 2 1971

ONT. DEPf. OF MINES AND NORTHERN AFFAIRS

NATIONAL TOPOGRAPHIC SERIES 53 C

PLAN NO. M.-2172

ONTARIODEPARTMENT OF MINES

AND NORTHERN AFFAIRS

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Surveyed for:-

COCHENOUR EXPLORATIONS LTD

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