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52Be9NWaail 63.4366 KASHABOWIE LAKE
A REPORT
DESCRIBING THE GEOPHYSICAL SURVEY ON LAND LEASED
FROM THE ONTARIO DEPT. OF MINES,
DECEMBER 1st.1942
BY
THE AIDERM4C COPPER CORPORATION, LIMITED
010
KASHABOWIE CONCESSION
An area of approximately twenty-nine square miles in the
Kashabowie District of western Ontario was closed to staking from
Dec. first 1942 to June first 1943 to allow Aidermac Copper Corp.
to do geophysical and other prospecting work. 1'he concession was
granted by the Ontario Dept. of Mines upon payment of a fee and
upheld the rights of any claim owners in the area as of Dec. first
194S. '-^he area was bounded on the east by the west boundary of K-56
and its extension south to the south shore of Upper Shebandowan Lake,
on the south by the south shore of the lake and the old tote road
west to the east boundary of Moss Township, on the west by the east
boundary of Moss township and on the north by the south boundary of
Ames '^'ovmship, the '^'ip 1'op Spur and the C.N.R. It also provided
that the company could stake and record claims within the time of
the concession.
The season of the concession provided only a&out six weeks
when the ground was free from snow and frost so geophysical methods
suitable to these conditions had to be employed, it was decided to
- 2 -
cover the vhole area with a magnetometer survey during t he winter
months and with these results as a guide carry out detailed work with
solf potential and resistivity methods in the spring. It soon
became evident that sufficient labour could not be obtained to cut
the necessary picket lines and that it vrould be impossible to complete
the magnetometor survey in t he tins allocated. It was then decided to
cover certain geologically favourable areas first and use the remaining
time to the best advantage. Approximately seven square miles of the
concession were tested by geophysical methods. Five forty acre claims
were staked in the concession as a result of the work.
GEOPHYSICS -
The magnetic measurements were made with an Askania magnetometer,
which measured the vertical component of the earth*s magnetic field,
'i'he readings were corrected for temperature, daily variations and tied
to an arbitrary zero. The values mapped have an accuracy of ^K 10
gammas, ^'he variation in magnetic values is due to the variation in
quantity of magnetite,'in the bed rock or the concentration of other
magnetic substances such as pyrrhotite. It is sometimes possible to
locate geological contacts, shear zones, faults and other data from
these results.
The self potential methods used are based on the fact that
oxidizing sulphides become electrically polarized. These polarized
bodies set up an electrically potential field about themselves. This
field can be measured by suitable instrurasnts. In this case a D.C.
- 3 -
Potentiometer was used to measure the potential between two electrodes,
one stationary, and the other moved at one hundred foot intervals along
a line. A reel of copper wire on a stand served to complete the circuit.
The resistivity method used is known as the "Central point jvjjthod".
It was developed by prof.. (.CHlchrist of Toronto University. The sulphides
give lower resistivity than other rock types.
GEOLOGY;-
'i"he rocks underlying the concession vary in age from Couchichingi
sediments to late Pre-Cambrian diabase, but for the most part consist
of Keewatin lavas and related intrusives. T ne geology has been mapped
by Dept. of Minos geologists and is shown on the east half of the Quetico
sheet. The Shebandowan Area sheet covers part of the concession in more
detail.
Additional work done 1 by the writer is shown on IJip No. 15. This
work was concentred in the areas to be investigated by diamond drilling.
Outcrops of Couchiching sediments were located s.xmth of the C. N. tracks,
half a mile vrest of Kashabowie, but the contact with the Keewatin is not
exposed. A large body of gabbro was intruded just south of these sedi-B
raents. It was on the contact of this gabbro that one of the most
interesting geophysical anomalies was found.
The Keewatin fi OUT rocks underlie the gredlsr part of the concession.
They vary in composition and include many bands of agglomerate or breccia.
Some narrow bands of iron formation outcrop in the lavas on the north
shore of Shebandowan lake.
- 4 -
An irregular mass of Granodiorite is intruded in the eastern
part of the concession and extends eastward on claims K-56 and Z-71.
It is white in colour and contains a very snail percentage of basic
minerals, '-^lis rock also outcrops in other parts of the district.
The granites are very conspicuous because of their red colour. Large
masses jut into the concession on the northwest and Southeast of
Burchell lake. Smaller bodies intruded in the greenstones are usually
lenticular along the strike of the formation. An extensive alteration
effect occurs along the contacts in some places. Red feldspars are1,1
developed in the surrounding greenstones. Ahis was very evident on
claim K-56 just east of the concession boundary.
FRBUMIHARY OSOFIIYSIOAL INVESTIQATIOK3.
During the month of November 1943 come geophysical tests were
carried out in the area to study the reaction of known sulphide bodies
and determine if other deposits could be located by the methods em
ployed. Magnetic and self potential methods v/ere used for these tests.
Several profiles were made with the magnetometer between Kashabowee
and Shebandowan lakes with stations one hundred feet apart. Comparatively
small variations, of less than one hundred gammas, were found with an
occasional high of five hundred gammas. Detailed readings ofer two
sulphide showings on K-56 and Z-71 gave highs of 1500 gararas . '^hese
highs were due to magnetite not intimately associated with the ore as
several samples were non-magnetic. It was noted particularly that where
the magnetic highs occurred on the long profiles, shearings with some
disseminated sulphides were known to exist.
- 5 -
These results indicated that the magnetometer v/as the ideal
instrument to carry out preliminary investigation, that sheared
.areas could be located and traced by it.
Self Potential work over the sulphide shows gave readings up
to 350 millivolts which is about the usual figure for massive sulphides
which are not wholly pyrite.
These results indicated that self potential work carried out
over the shearings, located by magnetometer v/ork, would pick out any
zones containing massive sulphides. It was decided to proceed with
the magnetic work during the winter months and check the results with
self potential methods when tie frost was out of the ground.
The work on the concession v/as started early in December with
a crew of four to eight men. It v/as first necessary to establish a
set of picket lines over the areas to be investigated. East west base
lines were cut at half mile intervals, the first half a mile south of
the C.N.R., and the second a mile south. North south lines were cut
at 400 ft. intervals along the base lines, '^he distances between them
v/as checked on each base line so their position could be accurately
mapped, l1 he s e picket lines were easy Jo cut in the northeast part of
the concession as the bush is sparae, however it was a different
matter around Burchell lake where the topography is very rough and
thero are many.-windfalls.
The magnetometer readings were taken at toe hundred foot
intervalsalong all the north south lines, ' ' 'he values are referred to
a base station at A .f- o, O which was assigned a value of zero.
- 6 -
This station or another base, as a series of them had to be set up
to eliminate walking, was measured four times a day to correct for
daily variations in the magnetic field.
These magnetic values have been plotted on Maps No.2,3 and 4,
on a scale of 400 ft. equal one inch* The values are in gammas
and record the vertical intensity of the earth's magnetic field at that
point in comparison with its value at station A *f O* 0. Maps 3 and 4
show only contours drawn from the magnetic values.
DISCUSSION OF M/UaJETIC RESULTS.
The area of map No.S may be divided into two definite magnetic
zones. The first borders on the north shore of Shebandowan lake, is
three quarters of a mile wide and the length of the map area. It
probably extends some distance to the southwest where magnetic measure
ments; were not made. This area is underlain by Keewatin lavas of varying
composition and content of magnetite. The magnetometer values here rise
to more than three thousand garanas in many places. The contours indicate
banding in a N 700 E direction which is the strike of the rocks in this
area. Some iron formation occurs along the north shore line. These
magnetic anomalies are not flue to shearing but merely to the content
of magnetic iron in the various lava flows or parts of them.
The second zone extends north to the track. Most of the magnetic
values are under two hundred gaimns but in certain limited areas values
of two: thousand gammas were found. These anomalies are most interesting
because of their limited extent. Some of them occurred over draws and
valleys where shear zones could exist.
- 7 -
In the Burchell lake area map No.3 shows the magnetic anomalies south?
west of the Tip Top Mines and south of Burchell lake. The prevailing strike
of the country rock is indicated here by the strike of most of the magnetic
anomalies. The most interesting ones however are divergent to the general
strike; and are marked A, B, and O on tiie map. They occur close to the
contact of a major gatanite mass and are about parallel to the contact. Map
No,4 shows the anomalies found on the northwest side of Burchell lake where
the work was continued adjacent to another granitic intrusion. Here they
qre small with values to 500 gammas. A profile south east across the lake
was made to join the area with that to the southeast. Some of the values are
shown on this map. They are faitly high without much variation indicating
that the lake is underlain by fairly magnetic rocks and is not very deep
along this line*
SELF POTENTIAL RESULTS.
The self potential work was carried out in much the same manner as the
magnetic survey. The lowest value read was called zero and all other values
corrected to that base. It was originally decided to check only magnetic
anomalies with the self potential, but due to their extent, parts of the north
east map area were completely covered.
These results have been plotted on Map No.5. Most of the values are
well under one hundred millivolts and indicate very sparse dissemination of
sulphides. There is a general high area in the centre of the map sheet near
the lake shore where the readings are just over fone hundred indicating
disseminated sulphides. A heavier concentration is noted within this area
where the values are somewhat higher. As there is little overburden they
- 8 -
are not high enough for massive sulphides.
Two other self potentital highs occur in the northeast corner
of the concession, one on TB. S9901 and K-56 and the other on TB*29900
and TB. .89442. These occur in two draws and ithe values rise to four
hundred millivolts which could indicate massive sulphides. Detailed
work was done on these anomalies and will be discussed later*
The magnetic anomalies in the Burchell Lake area were checked
by self potential. Those referred to as A, B and O are apparently due
to concentrations of magnetite as the self potential values over them
were no higher than fifty millivolts* A small area of disseminated
sulphides is indicated on t he northwest shore of the lake but it is
of minor importance. ':No nap of these results has been made.
The detailed self potential work and resistivity profiles on
the anomaly on TB. 89900 are shown on itep No.6. A base line was cut
through the centre of the draw which coincided with the centre of the
anomaly and cross lines placed at one hundred foot intervals. Self
potential readings were taten at fifty foot intervals on all t bs se lines
and at ten foot intervals on eonB of them. The ten foot readings were
taken to find out if the anomaly was due to a series of narrow planes
or a continuous body across the width. The only break in the profiles
are on lines B and C where there is a slight decrease in the centre of
the anomaly. This could be due to a deeper ^uge along the centre of
the draw where more overburden would result in lower values. These self
potential values are caused by a body of material fifty to sixty feet
wide and four to five hundred feet long fairly close to the surface.
It is notable that the gradient of the profile is unchanged where itt
passes over the exposed rocks on either side of the draw. As mentioned
. 9 -
before the rock to the north of the draw is Keewatin Gabbro with
Keewatin lava to the south. The lava is slightly talcose and dips
vertical to the north. Detailed magnetic profiles showed a magnetic
body of the s ante width as that indicated by the self potential. These
profiles have been plotted over the diamond drill sections.
The anomaly was then checked with resistivity methods. Central
points set ups were made at points A^,B, O, D and E and resistivity
measurements made at fifty intervals on the cross lines for a distance
of five hundred feet in each direction.
The profiles are shown on Map No.6, the dashed line indicating
the readings to the north and the continuous line the readings to the
south of the central point. Lines A, B and C show the curve over the
anomaly lower than the curve away from it, viiile on line D, the curves
are about the same. Over line E the curves both lines rise fairly
consistently indicating the zone has been passed. On the whole the
values are not low enough to indicate massive sulphides but were
sufficiently positive to necessitate diamond drilling.
The self potential anomaly on the boundary between TB.29901
and K-56 was detailed in the same manner. The results have been drawn
up on Map No.7. This anomaly occurs in a wider draw and is underlain
in part by granodiorite. The self potential are somewhat higher here,hundred
rising to six millivolts at one point on line D. The anomaly embraces
a large area and has two centres. It was especially interesting because
a small sulphide show occurred on its strike, eight hundred feet to the
southeast. The high self potentials indicated the presence of graphitic
material.
- 10 -
The resistivity curves here are similar to tixose over the
other anomaly, the lines over the anomaly being lower than those away
from it but not sufficiently low to indicate massive sulphides. A test
profile was made over the sulphide show on K-56. The curve to the south
rises quite rapidly but that to the north stays flat from 200 to 400 feet
and has a value of 0.5 x 10 . This is only half the size of the
resistivities on line B. There is no magnetic anomaly in this area.
Diamond drilling was decided upon clue to the position of the
self potential anomaly with regard to the granodiorite and because of
its position on the strike of a sulphide deposit.
DIAMOND DRILLING.
Two holes were drilled in the north anomaly. The NCuljras located
one hundred feet north of the base line on line B and drilled at an angle
of 45O to the south. The hole cut 121 feet of gabbro, 95 ft. of talc
schist and 58 feet of medium lava. The talc schist contains very fine
disseminated pyrite and chalcopyrite which could not be seen without
the aid of a glass. There are also fine magnetite crystals distributed
through it. The copper values averaged less than one fifth of one per
cent.
Hole Ncu2 was located one hundred feet north of the base line
on line C and drilled to the south at an angle of 600. This hole cut
126' of gabbro, 98* talc schist, 6" of graphitic ash rock at a depth of
B34* and 69* of medium lava. The schist was less talcose and contained
less sulphides. The graphitic rock is important in that it probably
caused the self potential anomaly in combination with any sulphides
present. The magnetite crystals explain the magnetic anomaJy, while
the talc schist with the sulphides present would lower the resistivity
- 11 -
values a certain extent. In order to explain the size and regularity
of the self potential anomaly it seems likely that there is fine
disseminated graphite in the zone besides the narrow band of graphitic s
rock.
Hole No.4 was drilled in the south anomaly. It is located
75' north of the base line on line A -t- 2, and me drilled at 45O to
the north. It cut 35' of granodiorite, 127* of Keewatin complex
including acid lavas, basic lavas and tuffs with some disseminated
pyrite and two notable graphitic sections. The hole then cut 30* of
gabbro.
Hole No.6 was located 230* southeast of hole No.4 and drilled
at 450 in a northeast direction. It intersected 92* of granodiorite
and238* of Keewatin lavas. A 20* gabbro dike was cut at 235* preceded
by 25' of talc schist. There was some pyrite mineralization and sons
sections were graphitic.
The same physical phenomena occur here to explain the geophysical
results as in the north anomaly. The lack of a magnetic anomaly is borne
out here as no magnetite was found in the drill-core.
OONSLUSIONS.
The results obtained from the investigations in this area have
been negative from an economic viewpoint but oansiderable information
has been gathered to aid in future exploration by geophysical methods.
Each district presents new problems to the geophysicist and often
considerable time must be spent solving these. Geophysics is tied 80
closely to geology in prospecting that detailed geological work is
necessary for the best geophysical interpretations. This work can be
- 12 -
carried out most satisfactorily in the sunnier tine when the mar J mum
number of outcrops are exposed.
" •••••vx
ALDERMAC COPPER CORPORATION LTD.MINE
P. O
SHERBRC
52B09NW0011 63.4366 KASHABOWIE LAKE 900
Seventeenth, 1944.
Mr. H. C. Rickaby, Deputy Minister of Mines, Parliament Bldgs., Toronto, Ont.
/..-•J
(
Dear sir:-
Enclosed is a report describing the work done on the Kashabowie Concession granted tp this Company December 1st, 1942.
AS may be seen there'were no mine making discoveries but I think that the concession points the way to future mineral search methods. Qwite Ipoge areas are needed for this type of work when there is no advance information available. Most of the ground is drift, covered and seems to never have been attractive to prospectors. To/OD effective geophysical work, a wide range has to be available unless the locale is amenable to close geo logical examination. It is expensive and not worth doing if claim scalpers ^re in a position to stake nuisance claims.
On banalf of Aidermac, I wish to thank your Department for co-operation and for taking a forward move in prospecting that important part of the country's "unlimited mineral resources" that is e/f actively concealed by drift.
Yours truly,
A. V. CORLETT.
AVC/AL.
.c/V-- March 23, 1944
Aldermao Corporation, Ltd.,P.O. Box 159,SHERBROOKE, Quo . l
Oentlomen : ATTOITIOH i KR. A.V. CORLBrr. ' i
I beg to Qoknowledge rooelpt of the report
covering the geophysical work done on tho Kaehabowle Concession,
end I wish to thank you for snmo .
HCHtB. Vory truly youro,
H. O, Rickoby,
Deputy Mlniatar .
ALDER MAC
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S8BMNWM11 63.088 KASHABOWIE LAKE
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COPPER CORP
SHEBANDOWAN CONCESSION
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