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Norman Paterson (Se Associates Limited
RECEIVED
42A10NW8585 2.1285 DUNDONALD 010 A PR 1 Q 1Q7^
PROJECTS SECTION
REPORT ON
ELECTROMAGNETIC SURVEY
CLAIM GROUP 'D*
DUNDONALD TOWNSHIP f CONCESSION 3, (NORTH HALF),'
LOTS l AND 2 PORCUPINE MINING DIVISION ONT.
FOR
ASARCO EXPLORATION COMPANY
by
NORMAN PATERSON S ASSOCIATES LIMITED Toronto, Ont. January. 1973.
-1 ~ Norman Paterson (Se Associates Limited
l. INTRODUCTION
This report describes the results of an extra low
^frequency- (ELF) electromagnetic survey carried out for
Asarco Exploration Company by Norman Paterson and Associates
Limited of Toronto. The purpose of the survey was to prospect
for massive sulphides. The ELF instrument was selected for
this purpose because of its ability to penetrate thick layers
of conductive overburden which are known to overlie the
property.
2. THE PROPERTY'
The property is a group of eight claims^ lying in the
north half of Concession 3, Lots l and 2 in Dundonald
Township, which is in the Porcupine Mining Division, Ontario.
The claims which were surveyed are registered under the numbers
255718 to 255720, 292198, ^92989, 293649, 293650, and
293672 are owned by Asarco Exploration Company Limited,
44 King St. West, Toronto, Ontario. Access is by Highway 67
which cuts through the grid some three miles south-west of the
village of Porquis Junction, as shown on Figure 1.
3. GEOLOGY
The claim group is covered by heavy overburden and
the geology in detail has not been observed. Projection of
available mapped geology would suggest the group is underlain
by basic intrusives and/or volcanics of Archean age. This
has been confirmed by six holes which show mostly basic
intrusives in the form of peridotite and one occurrence of
gabbro. One hole shows volcanics in the form of andesite and
rhyolite. No economically significant sulphides were reported.
- 2 - Norman Paterson fe Associates Limited
The Alexo deposit just to the south of the property
contains nickel and copper sulphides. The mineralization
occurs in the peridotites close to the contact with andesites.
4. PREVIOUS WORK
^Surveys were carried out on the property in 1952
by Noranda Mines Limited, but the file on this work could
not be located in the O.D.M. assessment files. Magnetic and
Scintrex SE-300 and SE-200 vertical loop EM surveys were
carried out on the western 3/4 of the property in 1964 for
Alsof Mines Limited. Additional magnetic and Turam EM surveys
were carried out on the entire property by Geosearch Con
sultants in 1971. Except for a weak SE-200 anomaly, no
electromagnetic anomalies were observed. A prominent
magnetic anomaly occurs in the centre of the property. This
anomaly was drilled in 1964 by Alsof Mines Limited and found
to be caused by a peridotite intrusive. No sulphide minerals
of any importance were discovered.
The decision to conduct the present low frequency
EM survey was based on the possibility that the Turam instrument,
with a relatively high transmitter frequency, and the SE-300
and SP]~200 instruments, with relatively narrow coil separations,
may not have penetrated the 200 to 300 feet of overburden
on the property.
- 3 - Norman Paterson ft Associates Limited
5. SURVEY SPECIFICATIONS
a) Instrumentation
The equipment used on this survey was the Geonics
PJM-25 system with a frequency of 50 cycles per second. A
large Turam type t "r^n am-i t-1--in g loop is used to energize the
survey grid. The receiver measures the inclination and
ellipticity of the ellipse of polarization, values which may
be related directly to the in-phase and quadrature components
of the horizontal secondary field produced by a buried conductor,
The inclination is measured in degrees and is accurate to
h degree. The ellipticity is measured in per cent and is
accurate to h o f l per cent.
The EM-25 method de-emphasizes poor conductors such
as clay beds, water field shear zones and other electrolytic
sources. It also responds poorly to weakly connected or
disseminated mineralization thus producing a low overall
geological background. Good conductors, such as those
typical of massive sulphides will respond to the method and
their recognition is aided by the low geological background.
A practical lower limit to the detection aperture
with this method would be a conductivity-width of about 15
mhos. Most massive sulphide deposits are well above this
level, generally exceeding 50 mhos. Conductive overburden on
the other hand, seldom exceeds one to two mhos.
Some topographic effect is obtained with the EM-25.
Changes in elevation of the order of 20 to 50 feet can produce
in-phase errors of a few per cent. However, the quadrature
response is unaffected by topography and this type of error
can be distinguished from the response of true conductors
by the lack of quadrature response. Both the quadrature
-4 ~ Norman Paterson & Associates Limited
and. in--phase response increase nearly linearly with increasing
distance from the transmitting loop by an amount that depends
on the conductivity and thickness of the overburden. This
.linear effect can readily be subtracted from the data.
b) Procedure
In this survey, the large loop configuration was used.
The positions of the two loops are shown in Figure 2. A
total of 7.0 line miles were surveyed, in which 388 stations
were occupied at a station interval of 100 feet. Noise from a
60 cycle power line made 12 stations unreadable..
~ 5 - Norman Paterson fe Associates Limited
6. SURVEY RESULTS
a) Presentation
The survey results are presented in Figure 2 in the
form of stacked profiles at a map scale of l" to 200 feet.
The profiles are plotted at a scale of l" to 10 per cent
or 10 degrees. This is twice the normal plotting scale in
order to accentuate any weak anomalies. Unfortunately it also
accentuates the natural system noise associated with this
instrument and therefore may not be an improvement.
In order to relate the data to a datum line more
easily, a straight line segment of background equal to about
3 degrees per thousand feet away from the transmitter loop
was removed from the in-phase profiles. The same process
was applied to the quadrature data, using about 4^ per cent
per thousand feet.
b) Interpretation
Part of the survey area is severely affected by
interference from 60 cycle noise from power and telegraph
The effect was to produce either a signal that could
not be read or an anomalous departure from smooth background.
Lines 24E to 36E north of the power line were strongly affected and
very little useful information could be obtained. The power
line produced a marked negative anomaly, particularly on the
quadrature response south of the power line. This is very
noticeable east of Line 36E. The negative quadrature trend
on these lines may also be caused by a change in overburden
conductivity or depth which should be corrected for by a
second degree background correction, instead of the linear
correction used. In any case no anomalies are seen in this data.
To the west of Line 24E the data is less affected by
external noise and the profiles are smoother. No significant
anomalies are seen in this data.
— ft — Norman Paterson St Associates Limited
7. SUMMARY AND CONCLUSIONS
1. An extra low frequency electromagnetic survey was
carried out over the property under discussion using
the fixed transmitter method.
2. Interference from power and telegraph lines on the
grid interfered with some of the data producing both
unreadable signals and spurious anomalies.
3. On the rest of the grid, no significant anomalies
were observed and thus no recommendations are made for
additional development work on the basis of this
survey.
Respectfully submitted, NORMAN PATERSON S ASSOCIATES LIMITED
U
Roger K. Watson,B.A.Se.,P.Eng, Geophysicist
••'•'•" V (':
Figure l
LOCATION MAP
GROUP Dr^ ^
Scale: l'50,000 NTS.-42 A/10
'—/•'/ v~ X.--'-' .s-'~ ' V i -, v j , . -'"" -.--'"V"^-' :-:--; ., \ ^.. i : .
c**
42A10NW8585 2.1305 DUNDONALD 900
TO BE ATTACHED AS AN APPENDIX TO TECHNICAL REPORTFACTS SHOWN rfERE NEED NOT BE REPEATED IN REPORT
TECHNICAL REPORT MUftT CONTAIN INTERPRETATION, CONCLUSIONS ETC.
Type of Survey Township or Claim
Electromagnetic EM-25
Author of
Total Miles of Line cut
line cutting) for first survey.ENTER 20additional si same grid.
Magnetometer.
HATR- H fly
PROJECTS SECTION Res. Geol. ___
i
Previous Surveys
gw
. Approved by.
Approved by.
Lsarco Exploration Comoanv of Canada- 44 King St. W., Toronto, Ont.
R. K. Watson- 401 Bay St. , Toronto, Ont.Survey Sept. 23,flQ72 - Peh. 7, 1Q7-*
(linccutting to office)pr,,t 8 miles
VISIONS 13™ AUESTED r J., . , /feTcktnViPx l \t ————— Geophysical S \ \ " ; J
—Electromagnetic. *P , .j /As (includes V S 1 1\ , f ; t -Magnetometer-X-^^ S 11
i ~ ,-n1*^ 1 7 —UaHintnptrir ^ ^
( 1s for each -Other ———————————— ̂ - ^:y Using Or.lr.aira! f\ ^ '
-Jk* •'^ V^JG^A^h^mir,.! ..7—., 0 ^ '
DITS (Special provision credits do not apply to airborne surveys^-TpCfc'f
F.]prf"'Tiapnptir Rarlinrnptrir(enter days per claim)
T-fc ^ 1 1 .?siON[A rrT^RP'' \J^ "O^oLA^^JLV,Author of Report or Agent
TONf OiialifjratipNQ #^ . l^r^Tf
4 ilLlfa '~ *, y j? \n til i t- ^A i X X y l n\sfrst'\ q (f Sty /""-fii "6***3Js***~*A OuJLt^f C\-.C,.X-t.^ L̂^tt^r^f -^--*vt--.>ovvxJL r y v tt^Q'AfuVr\CJ^aC^cn?d'
RAMr.H
rt o 4- r*
HANP.H
rlatp
MINING CLAIMS TRAVERSEDList numerically
p J?5573iJ5 '(prefix) (number)P 255719 ,
P 255720
p 292198
J p 292989,
P 293649 .......................,.......................................P 293650,
\scs\ * *yjo/*.p-...^...........................................
V^jytxCo-pv ci/ l?^|pirvj
1 i i m *jr v j i/ '^1 W^r^v
^^...^J...........................................\.S4?r,.,,,.,,,,.,..,................,,...f . . - . -- '
TOTAL CLAIMS 8
Show instrument technical data in each space for type of survey submitted or indicate "not applicable"
GEOPHYSICAL TECHNICAL DATA
GROUND SURVEYS
Number of Stations______3RR____________________Number of Readings____375 Station interval———HUH____________________________________________ Line spacing___4np '________________________________,————————.————. Profile scale or Contour intervals Profile l" g 10*
(specify for each type of survey)
MAGNETIC
Instrument.Accuracy - Scale constant— Diurnal correction method. Base station location.—-—
ELECTROMAGNETIC
Instrument______GeonJCS E.M. 25____Extra Low FrequencyCoil configuration Orthognal
Coil separation Variable——Amirary In-phase to 1/2 degree, out-- nf phqge fcp . 1/2 . t-CV.1% -———— ———— -——— Method: E Fixed transmitter O Shoot back d Inline D Parallel lineFrequency 50 cycles per secon^ -————-——.———,.^-^.---——-—^— ,^-^—.-—----——-^—1— —--————-—
(specify V.L.F. station)Parameters mpasnrprl Tilt- nf ppi gyj zatT-lon gllipsg (In^phasg) j Elllpticity _____
(Quadrature)InstrumentScale constant.Corrections made.
Base station value and location.
Elevation accuracy———————————————INDUCED POLARIZATION - RESISTIVITY
Instrument—————^^.—-.——^--..——.--.Time domain——————————————————————————— Frequency domain. Frequency____________________________ Range———————Power™.^^^—-—---^^^————---—————--—-——-—.—..^^—-——.^^-———..-——.Electrode array-— Electrode spacing. Type of electrode.
TWf TOWNSHIP Qf
Mf C A RT TWI? - M.
BISTRfCT- Of
PORCUPINEMIHJNG O iWSION354624 l 1(334622
— -1326D6 . j
CROWN LAND S AU
RIGHTS ONLY
'S HIGHWAYS
MfcRSH.
MINI S3Z6486 j 352 585L . L ' -L^—* ^ f—* —* —*- -y-- f^^^^
75881 70q*0 .., w , L— —-.u—x;
l L,House \ L103586 'l 403589
*T
,^Hsurface ngm r art terttis and
M***
:'-;^UI;,!M^^
L 0 1\2 S * '"Flooding nghts on freserved to H .EPf^^ contou^ ele. 903'
7IOtfl j 71016 MJtO l (D H.flO-—t^T—i—I03S48 103541 10354O 10*559 J
v^ S P.O. reserved tor files 39684,
Area marked thus l Park S ite.103851 103650 I03B49 ! 103548
IOS56S (37l3fi8 371367 l 371366 371365.., _ —*.-—. — _ i _ j-L ' . R L
- MINING LANDS -
DATE OF ISSUEI0355fi l (0353B | W3f9T 1038*6 571373 | 37137* 371371~ "~" ~ " (C) MRO '0 MAO Ctr~ H~ ~~103563 t'03562 110356' M03560 l BTI57T t JTI378 , S7I3T6 APR 27 1973217^50, 217031
^- —^ l - — — -L__j___4_--J__ — -l-1 L. ) L. l L. R. ill.
MINISTRY OF NATURAL RESOURCES817038 2170*^43(u wito (y M.BJO
PUN NO
GERMAN TWf? - M.283 ONTARIO
MINISTRY OF NATURAL RESOURCESSURVEYS AND MAPPING BRANCH
42A)0NWe585 2.12*5 DUNDONALD
26+00 N —
24+OON
22+OON
20+OON ——
18 + 00 N ——
16+OON
14 + OON
12+OON
10 + 00 N —
Lot 3
Cone. IV Cone. Ill
Tx. Loop Z
6 + 50N24-f GOE
26 + OOS
O-f 00
V
Lines 0-20E,
ION - 26N8 + 00 N ——
6 + 00 N
4 + 00 N
2+00 N —
Lot 12
B.L. 0+00
— 26 + 00 N
20+OON
0 + OON
— B.L.-0 + OO
N
42AieNWaS85 2.12*5 DUNDONALD 210
Quadrature O
Quadrature '
. In -phase
IO' O In- phase
N —- Reading obscured by 60 cycle noise
Field survey date: November 13-22, December 4, 1972
January 9-10, 1973
Tx. Loop l 4 + OOS
52 + OOS 0+00
54 + 78 E
Lines 0-20E, 0-ION and Lines 24E - 54+78E complete
Figure 2
ASARCO EXPLORATION COMPANY LIMITED
DUNDONALD TOWNSHIP
CONCESSION III, PARTS OF LOTS 182
CLAIM GROUP 'D'
PROFILES OF IN -PHASE AND QUADRATURENTS NO 42 A /,0 E M ' ̂ S URVEY
DRAWN by: H. Ricketts
APPROVED ;
SCALE ! l : 200
DRAWING NO! 084/3
DATE : February, 1973
NORMAN PATERSON 8 ASSOCIATES LIMITED CONSULTING GEOPHYSICISTS, TORONTO, CANADA
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