questor surveys limited airborne gamma ray spectrometer …
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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.
D.Twatson
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AREA Cj
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'
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•52 0 30'
29
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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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