on survey on thl pkopertx of coin lakk gold mines ltd ... · s2m0to*l24 2.34, hammell lake 010...
TRANSCRIPT
S2M0tO*l24 2.34, HAMMELL LAKE
010
REPORT
ON
SURVEY
ON THL PKOPERTX OF
COIN LAKK GOLD MINES LTD.
TODD TOWNSHIP
RED LAKE ARKA. ONT.
INTRODUCTION
An electromagnetic survey has been carried put on
the lake portion of the property of Coin Lake Ooid Mines
Ltd. in Wolf Bay, Red Lake Area. It waft originally planned
to carry out the survey with a vertical loop unit to obtain
p.rcater penetration and a small portion was covered with
this equipment. However, it wae found that the conductive
responses were very strong and test work showed that the
horizontal loop equipment gave very good responses. It
was therelor dooided to carry out the entire survey using
horizontal loop equijxnent as the interpretative data is
rnort? cornvlote with this type of survey.
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Yh* l o) Lowlijf' report and a ccompanying maps describe
tin i * i u i 1 1 of the i-urvcy i.nd f ive A geological inter-
- r. t,;,:t.\o)i of tin- r t, M/.ltr .
O.1 * J y I-'H: Kke j'ortiorj of the property was covered
the- iirci't ut, turvoy end this covers the greater portion
tVo'i f R; y f i what i fi ref'errfui to ac the wtk nt portion
fuo i.: \ : o .
'fm . rc^: t.j'i y M. this- t imw of year is accessible by
! 'i''o a. 1 .'.-.i. , ; .v;. ji ; j'C -: /, i i \. r,-; f t fror-i Rod La Jet, a d istance
' !:v .i ' .".'*.t ,' ! v st-, v f. M i..i5 3 1 f ,
y o .i' I-'"', f.rea li. ahovrn on Man 49o of the
by the Ontario
M' fftir.jT.Jly .ncifrihdn by intennediate and
(U'i', c. ' '',-ttM o i' Torii f^camin^ aedimonts
' ,.i..(ji ; .1 y 'vii'i.j ...t) of UK; t'u't:fc K, u r ve- y s* c!
in- c- 1 ' ' . frorn t No ri\\i u; i cd], man, All of
"li-; M MIH.- '* vx"ob^hj.y underlain
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by sediments but the north shore is mapped as volcanics.
The contact between the volcanios and the sediments lies
somewhere- between the north shore and the base line.
The Temiskaminp sediments include greywacke, as the
most abundant rook tyoes, while slate, quartzite and con
glomerate are also found. In Wolf Bay outcrops of con
glomerate are found and also numerous outcrops of slate
occur in th* northeast end of the bay.
SURVEY i^THQDS AND .INSTRUMENT DATA
The electromagnetic survey was carried out over
previously cut lines in a northwest direction at 200 foot
intervals.
The vortical loop equipment used was a McPhar type
unit with a 45 foot perimeter transmitting loop and read
ings wen. taken with coil spacing up to 1,000 feet, as
shown on the accompanying map. The transmitter 8et~uj)B.
were laid out along the strike of the indicated conductive
zones and the dip angles are plotted as profiles on a a**' ""H***""* l*-'-****'*V"*"'*JW''
scale of 1 M equals 20 degrees.
The horizontal loop electromagnetic survey was
carried out using the Konka Mark H horiaontal loon
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equipment with a 300 foot ooll Interval. In the horiaon-
tal loop type of survey both the In-phase and out-of-phase
components of the secondary field are measured, whose
special characteristics make possible a fairly accurate
evaluation of the conductivity. A conductor caueed by
eulphide mineralization will produce a curve going from
oositive readings throng sero to negative and back again
to positive. Both the in-phsse and out-of-phase readings
show the same general curve* The ratio between the in-
phase and out-of-phase readings over a conductor is an
indication of the conductivity of the body. A good con
ductor would cause a greater deviation of the In-phaae
co:n?.onant than the out-of-phase component. The opposite
is true of a poor conductor.
RESULTS OF THg l^LECrROMAQNETXC SURVbY AND ir'TSflPftETATION
The electromagnetic survey outlined a series of
more or less parallel conductive eones In a northeast direc
tion. The conductors vary in length and width but generally
are quite continuous and in some oases in the south end
of the area surveyed, extend beyond the lake onto the9
shore.
^ f ^ PROSPECTING GEOPHYSICS LTD.y *
The majority of the conductor* would appwar to 11*
within the sedimentary rooke although "A" son* along th*
north contact le within the volcanic rooks. The conductori
Arc generally quite strong and In Bom* eases, from th*
intensity of the readings, they appear to b* at a relatively
shallow depth. A brief description of each of the conductive
zones follows:
"A" ZONK
This conductor is quite strong and very continuous,
following the shore line throughout the survey. The con*
ductor was picked up in both the vertical and horisontal
loop surveys. Unfortunately, it was not possible to obtain
the full width of the eone due to a sharp rise at the
shore line. It was also difficult to determine the din
of the zone but it is t-robably to the south.
The conductor probably lies along either a contact
or a fault eone. Prom the continuity, either graphite or
iron formation le suggested and nagnetic information would
help determine* the cause of the conductivity. Geological
examination along the ehore may also be of assistance.
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"B" ZONfc
This zone i 6 at the south side of the bay and Ho
within the sediments, it ie pretty well continuous
acroes the bay 6nd continuet onto the shore in both direc
tions. At the west end it appears to show a very great
width but it nut y possibly be made up of a number of closely
spaced narrower zones. This could be particularly true
if the conductor is due to graphitic slates. Further north*
east the conductor ie shown as two or three separate
zones which include "I" and "J", It seems apparent that
these conductors are similar and would be caused by the
same type of mineralization.
The conductivity is quite high, esoecially at the
weat end where it goes onto the shore. Examination for
outcrops in thin area may give a clue as to the cause of
the conductor.
"C" ZONE.
This parallels "B" zone but ie much weaker and does
not appear to bt. as continuous. However, "I" zone may
well be the continuation of this zone to the east. It
prob&bly represents the Bame material as MB W zone.
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"D" ZONE
Thin conductor also parallel* "B* clove to the shore.
Only the north edge of the conductor ha* been outlined
as the line* would have to be extended to the south to
determine the full width and extent of the tone. This
again is interpreted ae representing the same Material as
"B" *one.
It is not possible to determine the dip of these
zones because of their elose proximity to each other but
it le likely they are near vertical or conform with the
regional schistosity.
"E" AND "G* 30NE3
"S" aone has a length of 2,600 feet and "G" Bone is
offset to the south at the east end and continues for
another 3*000 feet. The two conductors appear to be
similar and lie within the sediments. Prow the continuity
of these conductors and the fact that they are within the
sediments, one suspects graphite but magnetic information
should help in the Interpretation as it could possibly
represent sulphides or a band of iron formation with
sulphides.
PROSPECTING GEOPHYSICS LTD.
"F* ZONE
This zone has an indicated length of 1,000 f t e t but
may poaalbiy extend further in both directions and it
weaker arid masked by overburden. This ie suggested by
the profiles ana the vertical loop survey showed a con
ductive resoonee on line /*6W that could be the extension
to the southwest. The conductor shows the best response
on lino e 38W and 36 W and since this zone could be in the
volcanics, it may well represent sulphide mineralisation.
"H* , "I*. AND,*! J
These zones show as closely spaced parallel conduc
tors within the aedimdnts and could represent graphitic
slates with or without sulnhidos. Geological examination
on the point of land should helt* to determine the cause
of the conductor. This r.rour) of conductors can probably
be grouped with B, C and D zones and information from one
of these should determine the significance of the others.
"K"
This* ah owe as a weaker and shorter conductor along
the some strike as "B" zone. It may well be masked by
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overburden fur-the r alonp strike. This is probably
located olooe to the volcanic-sedimentary contact and the
dip appe&rs to be steeply to the north.
"L" ZONE
This conductor only has a length of 200 feet but it
appears to continue in both directions and may be masked
by overburden. It lies within the sediments and shows
the greatest conductivity on line 22E and shows an
aoparerit steep dip to the north.
"M" ZONE
" M" Zone appears to be within the volcanic rocks and
has an indicated length of about 400 feet. It shows the
greatest. width on line 22B and the dip appears to be to
the south. This could well indicate sulphides within the
volcanic rocks.
"N" AND "Q" ...
Those two conductors are groupud together as they
have similar characteristics and also more or less Iden
tical geological environment. They ere both within the
sediments which are most likely slate in this area and in
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both cases they appear to be almost along tht north eon-
tact of granite dyke*. They possibly represent a contact
shear cone which may contain graphite and/or sulphides.
The* full width of theae tone* haa not been indicated
&B they are both close to the short. This alao makes it
difficult to determine the dip but it probably ia ateep
to the north*
"P" ZQjfg
Thie ie another tone that lies within the volcanic*
and obvioualy oontinuea further eaat on land* The con
ductivity is not etrong but the geological environment
would favor aulphidea aa the cause of the conductor.
CONCLUSIQNS1 AMD REOOMMENDATIONS
The electromagnetic survey outlined multiple parallel
conductive aones striking in a northeast direction which
more or lees parallels the trend of the band of sediments
that underlie the southerly portion of the property*
It in apparent that most of the eonduetora within the
sedimentary rocks are similar in characteristics and
probably have a common cauae. In view of the continuity of
- 11 - PROSPECTING GEOPHYSICS LTD.
the conductors and tha known presence of slate, there
would appear to be a good chance that graphitic slat**
may be tho cause of the oonduotivity* However, many of the
zones show very big- conductivity and it is thus quite
possible that sulphide mineralisation nay also be a con
tributing factor. Geological examination of the shore
line and magnetic data on the conductors would be of great
assistance in interpreting the results prior to diamond
drilling. It does not eeem advisable to drill too many of
these zones unless initial drilling is encouraging as the
indications are that they are similar*
The conductors within the volcanics may be of signi
ficance and could well represent sulphide mineralisation.
Again t magnetic data would be of help in the interpretation.
Included in this category are "F", "M", and MP" aones
End poBcibly "K". Diamond drilling is recommended on these
cones unlese additional information dictates otherwise.
"A" zone is a very continuous Bone and geological
information should determine if drilling is warranted for
thie zone.
It is diflMcult to determine thf dip of the sones
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due to the proximity of the conductors and the lack of
detail on others near the shore. Thie is due to the faot
that the survey was limited to the lake and lines were
not extended on land. However, the dip appears to be quite
R tee p and in roost oases it is probably to the north but
may vary locally.
Reoonunended drill locations are as follows: "F" - line
33W, "E" - line 34W, "B" ~ line UW, "M" - line 22B, "P" -
line WE, "K" - line aw, and "O" - line 62E. All holes
should be located armroxiotately 150 feet from the con
ductor and drilled at 50 degrees. In moet cases they should
orobably be drilled from the northwest side of the conductor.
Results of initial drilling and other interpretative
data obtainable will largely dictate whether all of the
aoove drilling chould be carried out.
Respectfully submitted,
PROSPECTING GEOPHYSICS LTD.
H. J; BergsJejin, PT En*
Montreal, Que. March 6, 1970.
- l - PROSPECTING GEOPHYSICS LTD.
ADDENDUM
TO ftEPOH OH
ELKCTROMAONfiTIC SURVCf
IAKK QX.0 I TP.
TODD TOWNSHIP.
The following is an addendUui to the report, dated
Maroh 6, 1970, describing the electromagnetic survey
carried out in Wolf Bay, Todd township, for Coin Lake
Gold Mines* The original BUTTS? was dons on ths laks por
tion and sinos that tis* ths surrey has been extended to
the land portions on the east and west ends of the pre-"*-*..~^ i -, (.u.,, .'J-',." .-.-i *-- i'" - - ' -' '' r- -.- i , . .J ,... f. ; M. ...i-,. - ".v M, H- -i "ir "-iJ**. H ' '.-'-.-.rf-.-i .i,.- .......,...... , . , ,.j n, , , .,.i| ., ,... d ..^j,,,,. M, -,^.ia ,. l ,M ... ., r ,, ,. ... ( j. ,. .,...,.,-..,, ,. ^1U( h-,,, ,,r...rH rtt.hi( ,W.W"*1 *afirf*3H*t.' .
vioue survey. The results of the resent eleotroaiagnetio
surrey have been plotted on the sane nap and the revised
maps accompany this report.
A brief description of the results follows:
EAST END
The additional survey at the east end of the Bay
was oarried out along north-south lines previously cut.
This survey outlined the extension of "P* and also ooer-
pleted "O* Zone. To the south of "O", another series of
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conductive bodies were alto outlined and these are
referred to ne "R" Zone.
"P* Zon,e
This zone was extended to the east, giving it a
total length of about 1,600 feet. It i* wider at the
east end and ie aleo stronger. This is in the volcanics
close to the volcanic-sedimentary contact*
"O" Zone
The extension of the survey here indicates the
width of the eon* which is fairly narrow as compared to
the other sones. The dip appears to be to the north*
"ft"
This is a sone containing very wide and strong
conductors trending in a northeast direction. They extend
further to the east and probably join up with "N" sone to
the west. It is difficult to determine from the profiles
in places whether it is one wide conductor or a series of
parallel conductors that give a wide response.
The conductor* are in the sediments but appear to
be on the south contact of a granite dyke. From the
PROSPECTING GEOPHYSICS LTD.
appearance of the conductor! and the geological environ
ment, the conductors are believed to b* eauted by graph It*
with possibly son* sulphides, These conductors lint up
with "I", "J", "B", and "D" tones and th*f probably all
are similar.
WEST END
The survey at this end was carried out along lines' " Wtton.*.*^-".
cut in a northeast direction* The Island on which the
survey was extended has a north-south contact between the
granite and the sediments. Some weak responses war*
obtained that may possibly represent the contact son*. They
do not appear to be of much significance.
However t in the narrows between the islands, strong
responses were obtained on l in e e 10S, 203, and 2J*8. It it
difficult to know if this represents a north-eouth trend
ing zone or whether they are the extensions of "B" and "D"
eones to the west. The two interpretations are shown with
the north-eouth conductor in red. If the sediments are
actually striking north-south, the north-south interpreta
tion is favored but if the sediments continue east-west
and butt up against the granite, the east-west interpretation
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- 4 -
is fuvorad.
CONCLUSIONS AND RECOMMENDATIONS
The extension to ths origins! surrey helped to
delineate some conductors and also outlined further strong
conductive aoru*s within the sedimentary rocks. These line
up on strike with previous s ones and it is apparent that
there are more or less continuous conductors within the
sediments in the south portion of the area surveyed. As
mentioned previously, these probably represent the same
type of conductive material and because of the character
istics and the geological environment, it seems likely
that graphite le the main cause.
Geological examination is recommended on the land
i/ortions of the conductors as it is quite possible this
may determine the cause. Some trenching could possibly be
done in areas of light overburden in an effort to determine
if drilling is justified.
Respectfully submitted,
PROSPECTING GEOPHYSICS LTD.
Montreal, Que., H. J. Bergmartn, P. May 7, 1970.
atlv\KJi
DISTRICT K\TmciA
f" ., ,
Scale 40G]flins -l I pel?
w\ Map i
KKNORA•M.22IONTARIO
DEPARTMENT OF MINES AND NORTHERN AFFAIRS
"'^ y AW.^/*S
S2MetSEeiS4 2 .341 HAMMELL LAKE
A3 Transmitter set-up and number
Profile s^ale - l"*20 0 j;' i\ - :
Profile of jEM readings from Transmitter set-up No.3 Electrical Conductor i
VERTICAL LOOP
ELECTROMAGNETIC SURVEYfor
COIN LJVKE GOLD MINES LTDWo J f Bay Grid, Ontario
SCALE 200 400 600 FEET
M A R. 1970
PROSPECTING GEOPHYSICS LTD.
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