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GEOSERRCH COHSUI42ieiNE0691 2.3981 NEWNHAM BAY
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JUL X 1981
MINING LAN L* SECTION
Electromagnetic and Magnetic Surveyfor
DOME EXPLORATION (CANADA) LIMITEDon
PROJECT 159BLawagamau River, West Group.
Ontario
(To Accompany Maps! 81-12B, 81-13B)
June 12, 1981
- l -
GEOSEHRCH consuimnTS umiTEO
INTRODUCTION
An electromagnetic and magnetic survey was
carried out for Dome Exploration (Canada) Limited on
Project 159B, comprising three grids, in February and
March, 1981.
The grids are located between -J- mile and 1^- milesi
west of the Kattwagami River, 83 miles north-northeast of
Cochrane, Ontario. Access was made by aircraft from
La Sarre, Quebec.
The purpose of this survey was to locate sub-surface
geo-electrical conductors which might prove to be base metal
orebodies. Three conductors were located. The accompanying
maps show the area surveyed and the results obtained.
A technical data sheet is appended to this report.
)D AND INTERPRETATION OF RESULTS - ELECTROMAGNETIC SURVEY
Op era t inff Princ iple i When an electrical conductor is subjected to a
primary alternating field, a secondary current is induced in the
conductor. This current produces a secondary alternating field which together with the primary field produces a resultant field of
different amplitude and phase from the applied primary field. These
differences may indicate the presence of a conductor*
Operation; The battery-powered transmitter sets up a primary field while the in-phase and out-of-phase (quadrature) components of the
complex secondary vertical field are detected by a receiving coil and measured by means of a compensator-amplifier unit located a fixed
distance from the transmitter unit* These parameters are expressed
in percentage of the primary field*
Conductor Recognition; The typical curve over a steeply-dipping conductor
shows a low (negative - greater than 5^) over the centre of the
conductor, flanked by positive readings on both sides of the conductor*
Both the in-phase and the out-of-phase components usually produce
the same general shape of curve. An asymmetrical curve may indicate
one or more of the following conditions; (l) more than one conductor
(2) variable conductive overburden (3) a shallow dipping conductor*
Conduc t ivi ty De termination ; The ratio of the amplitudes of the two
measured components, in-phase to out-of-phase, is directly proportional
to the conductivity of the conductor, in areas of non-conductive
overburden.
Conductor Location; For a single conductor, both component readings are
normally zero when either the transmitting or receiving coil is
directly above the conductor. The location of the conductor is cal culated by adding one-half the distance between the transmitting coil
and the receiving coil (coil interval) to the co-ordinate at which
the readings are zero. A unique solution is generally not possible
in the case of multiple conductors spaced less than one coil interval
apart* This results in the possibility that an apparently wide
conductor may actually consist of two or more narrow conductors*
Depth of Penetration; The maximum depth of penetration for detection of
a steeply-dipping conductor in a geo-electrically neutral background
is about 0.7 times the coil interval* Over horizontal or flatly-
dipping conductors, penetration of up to 1*5 times the coil interval
is possible*
- 3 -
CEDSERRCH COHSUITRHTS UHIITED
INSULTS
Grid B-2 (Maps 81-12B2 East A West, 81-13B2 East A West)
A weak, poorly-defined conductor was located on
Line 16W at 5+30S (Map 81-12B2 West). It does not have any
significant magnetic expression* Its indicated location may
not be accurate as there is interference from the anomalous
readings caused by the conductor to the south at 8+50S.
A conductor was located between Line 20W, 11+25S and
Line 12W, 8+35S. It has the highest conductivity on Line 12W
where it is well-defined. The conductor does not have any
significant magnetic expression.
On Line 24E in the vicinity of UN (Map 81-12B East)
there are some anomalously negative high frequency out-of-phase
readings. As the low frequency readings are not anomalous at
this point, no conductor has been indicated.
The magnetic results on Map 81-13B2 East indicate a
narrow linear dike-like structure striking from Line 4E, 2U+50N
to Line USE, 6S. A similar dike about UOO feet wide intersects
the first one at an angle of 70 on Line 48E at 6S.
Grid B-3 (Maps 81-12B3, 81-13B3)
No conductors were located. Lines UN, 8N and 12N
were re-surveyed with an 800 foot coil interval in the event
that a conductor was beyond the range of a 600 foot coil
CEDSERRCH CORSUITRHTS LI m IT E D
interval survey. The 800 foot coil interval work also failed
to locate a conductor. Three lines perpendicular to the
original lines were also surveyed in case there was a N.W.-S.E.
striking conductor. The results were negative.
The magnetic results show little magnetic relief.
A strike direction roughly parallel with the base line is
indicated.
Grid B-4 (Maps 81-12B4, 81-13B4 East 6 Vest)
One very weak conductor was located on Map 81-12B4
West between Line 60W, ION and Line 52W, 9+35N. There is no
significant magnetic expression associated with this conductor.
The conductor's amplitudes and ratios suggest it may be due to
conductivity in the overburden rather than in the bedrock.
The magnetic results show low magnetic relief except
in the southeast corner of Map 81-13B4 West where there are
readings up to 1200 gammas above background.
RECOMMENDATIONS
A drill hole is recommended to test the conductor
on Grid B-2, Line 12W at 8+UOS* The remaining conductors are
too weak to be attractive drill targets,s
GEOSEARCH CONSULTANTS LTD.
J. A, Woodard, P, Eng.
Geophysicist
Ministry of Natur
GEOPHYSICAL - GEOLOGK TECHNICAL DATA
l-tlc.
39ei NEWNHAM BAY900
TO BE ATTACHED AS AN APPENDIX TO TECHNICAL RKWJKiFACTS SHOWN HERE NEED NOT BE REPEATED IN REPORT
TECHNICAL REPORT MUST CONTAIN INTERPRETATION, CONCLUSIONS ETC.
Type of Survey(s) Electromagnetic and Magnetic
Township or Area Newnham Creek d Newnham Bay Areas
Claim Holder(s) Dome Exploration (Canada) Limited\
Survey Company Geosearcli Consultants .Ltd,—————Author of Report J. Ac Woodard—-——————.---.-—-—-.
Suite 700, 88 University Ave. Address ot Anfhnr --p..,, . r ,^,- fw*-- Mr. T tTf,__________j. vjx uji i/u i uj i i/ e I'iju PTT3
Covering Dates of Survey Feb. 15 to March k, 1981
Total Miles of Line Cut 26
SPECIAL PROVISIONS CREDITS REQUESTED
ENTER 40 days (includes line cutting) for first survey.ENTER 20 days for each additional survey using same grid.
Geophysical-Electromagnetic.—Magnetometer——Radiometric——-Other—————.
DAYS per claim
ko20
Geological.Geochemical.
AIRBORNE CREDITS (Special provision credits do not apply to airborne lurveyi)
Magnetometer. .Electromagnetic ,, . Radiometric(enter days per claim)
June 19/81 SIGNATURE:.Y 'Author of Report or Agent
Res. Geol.. .Qualifications.Previous Surveys
File No. Type Date Claim Holder
MINING CLAIMS TRAVERSED List numerically
P-566009(prefix) (number)
566330 to 566332
566020
566287
566295
566299
566303
566307
566311
to 566025
to 566292
to 566296
to 566300
to 56630^
to 566308
to 566315
TOTAL CLAIMS 22.
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DISTRICT OF COCHRANE
PORCUPINE MINING DIVISION
SCALE: l-INCH r: 4O CHAINS
LEGEND
PATENTED LANDCROWN LAND SALELEASESLOCATED LANDLICENSE OF OCCUPATIONMINING RIGHTS ONLYSURFACE RIGHTS ONLYROADSIMPROVED ROADSKING'S HIGHWAYSRAILWAYSPOWER LINESMARSH OR MUSKEGMINESCANCELLED
C.S.(D Loc.L.O.
M.R.O. S.R.O.
NOTES
400' Surface Rights Reservation around
all lakes and rivers.
DATE OF ISSUE
MAR301982
Ministry of Natural ResourcesTORONTO
NATIONAL TOPOGRAPHIC SERIES 421
PLAN NO. MONTARIO
MINISTRY OF NATURAL RESOURCES
SURVEYS AND MAPPING BRANCH
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TOTAL fj^to MAGsieroMETecby
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PROJECT 159 B-4LAWAGAMAU RIVER AREA, WE.ST
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GEOS&ARCH CONSULTANTS LTD.for
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