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REPORT ON AN AIRBORNE GEOPHYSICAL SURVEY ELLIOT LAKE (MACE LAKE) AREA, ONTARIO, CANADA
ATLANTIC RICHFIELD CANADA LTD.
INTRODUCTION;
Between October 28 and October 30, 1969,. an airborne geophysical
survey was conducted in the Elliot Lake (Mace Lake) Area, Ontario, by
Atlantic Richfield Canada Ltd.
Of the 700 miles flown, 50 miles cover the actual claim blocks in
this report. Tho claims covered by this survey are located in Township 162
District of Alagoma, Sault Ste. Marie Mining Division, Ontario, Canada.
The port! of the airborne survey covered by this report was
conducted for the purpose of mapping the local magnetic and the very low
frequency (VLF) anomalies. Tho VLF receiver used was supplied by
McPhar Geophysics Limited, Don Mills, Ontario and Is outlined in
Appendix A. The Magnetometer used was supplied by EG&G, International,
Boulder, Colorado, and is outlined in Appendix A. Tho aircraft used to
conduct the survey was a Turbo-Beaver owned and operated by Atlantic
Richfield Canada Ltd.
The airborne geophysical survey linos were flown in a north-south
and east-west direction with a line spacing no greater than one quarter
of a mile. The navigation and flight path recovery were accomplished
through the use of doppler radar navigation instruments. This equipment
is outlined in Appendix A. The survey was flown at an altitude of 400 feet
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specd for 100 miles per hour.
* ASSESSMENT W ORK RESIDE^ b
SSM-1552
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Data Reduction
1 The VLF data were displayed using a profile format. The profiles
were examined and the VLF anomalies were recorded on the map as small
dots. VLF anomalies that were coincident with magnetic anomalies were
mapped as large dots. VLF anomalies are indicative of a relative increase
in the conductance of the near-surface rocks. The coincidence of magnetic
and VLF anomalies may be indicative of base metal mineralization.
The magnetic data is contoured by computer programming. The Earth's
normal field is removed from the total intensity profiles as recorded in
the field. These resultant data (in line form) are tied by a minimization
technique to provide a smooth, continuous surface that describes the local
magnetic field. This is done in two basic steps, (1) vertical datum
shifts (systematic errors) are determined to minimize mis-ties at all line
intersections, (2) the remaining mix-ties (random errors) are then removed
by beihg distributed between intersections along the data linos. During
this adjustment process, certain of the data lines may bo completely
removed if these lines fail to meet statistical requirements based on the
variance of the mis-ties of the individual lines.
The adjusted sot of magnetic profiles is now ready for gridding prior
to contouring. This gridding is accomplished by a proprietary line-oriented
gridding program. The basic requirement is that the survey be flown with
flight lines approximately parallel and more or less evenly spaced. The
. grid mesh is usually taken as the average line spacing but may be set at
any fixed value. The griddcd output is then contoured at an appropriate
contour interval.
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Aeromagnetic Map
The scale of this map is l" c 1,320 feet and the contour interval is
10 gammas.
There is one maximum anomaly trend exhibited on this nap. This
feature trends west-northwest and extends from the south center border of
the nap across the Cominco claim area in the vicinity of claim blocks 80T98 '2*79?! fr+t
and 60797. This feature is a portion of a major aeromagnetic maximum
trend that appears to be deformed by the syncline that lies north of this
map area.
VLF Anonrily Map
The scale of this map is l" c 1,320 feet. The small dots indicate
VI,F anomalies and the large dots indicate VLF anomalies with aeromagnetic
anomalies coincidences.
The only group of VLF anomalies of any interest that appear on this
map are located along the north boundary of the Cominco claim area in thelo 79V? 2o7*f9 2orjiy3 2o7V9* I&4'
vicinity of claim blocks 80828, 808*3, 80?fctf and north of 80*80. These
are VLF anomalies with aeromagnetic anomaly coincidences and they are
parallel to the large aeromagnetic feature noted in the discussion above.
feck C. Zahn, Mining Geophysicist
)
RECORDING SUBSYSTEMData are recorded in a digited and analog mode. The principal recorder is a 7 track Digi-Data Model 1420. The input rate is 0-200 characters per second. The packing density is 200BPI. The power required is 110V 60cps. A Non-Linear Systems Model 2710 Tape Verifier produces one full data word every minute to verify the recorded data. Data from all systems are recorded on a one second basis.The analog recording system provides a visual display of altitude* mag netic field, count rate of three isotopes, and gross radiation. These data are recorded on a six track MPE Strip Chart Recorder that operates on 110V at 60cps.
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ELECTROMAGNETIC SUBSYSTEM
The McPhar airborne KEM system using VLF transmission from Cutler,
Maine, 17.8 KHz, as the primary field was operated aboard the Beaver
aircraft. In the absence of conductors, the electromagnetic field is
horizontal and constant in amplitude. A conductor will distort the
horizontal field and often change the amplitude of the received signal.
The KEM system continuously measures the dip of the resultant field in
degrees and may be regarded as a vertical loop system with the trans
mitter located at infinity.
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NAVIGATIONAL SUBSYSTEM , The navigational system consists of a GPL Division GPK - 1000 Doppler Navigation Radar Set, Kearfott Gyro Guide Compass System. Honeywell Electronics Altimeter Set Y G 9000D, and an Automax G 2 camera for a backup system.
GPK - 1000 Doppler Radar Set . Operational Limits
Altitude - from 40 Ft. to 50, 000 Ft. over land or water withsea state greater than Beaufort 1.Groundspeed - 80 - 800 knots.Drift Angle - o0 - 400 right or left.Temperature - operational from -540C to 710 C.Pitch Attitude - 250 nose up or down.
Accuracies (507o probability)Groundspeed - 0.17^o -fc 0. 35 knots.Drift Angle - 0.17C
Power requirements are 115V at 400cps and 28 V DC.
Kearfott Gyro Guide Compass System
The error of the output signal with reference to eyro heading is less than l0 . The error of the output signal with reference to compass transmitter reading when compensated is also less than l*.
Honeywell Electronic Altimeter Set YG 9000D
This system has an altitude accuracy of -f 5ft. * 3 ^o of actual altitude. The power requirements are 115V at 400cps and 28V DC
Automax G 2 Camera j - jj 5 'x oThis 35 mm airborne camera is used as a back up for the Doppler Radar Set. In normal operations the camera is triggered on a frame every two seconds basis. Power requirer .its are 115V at 60cps and 28V DC.
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mw-MAGNETIC SUBSYSTEMThe Varian type V-4937A Transportable Magnetometer is operated in a fixed mode (stinger installation). The magnetometer read out is directly in gamma in the range of 20, 000 to 100, 000. The slow mode read out of l second is employed, giving l gamma sensitivity. A nominal 28V DC power is obtained by operating directly off the
taircraft battery.
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Author* s Qualifications - Jack C. Zahn
Graduated with a B.S. in Geology in 1961 and a M.S. in Geology with
a specialty in geophysics in 1965. Both degrees from the Ohio State
University, Columbus, Ohio.
Employed as a consultant geophysicist from 1962-1965 with
George H. Mayhew St Associates, Powell, Ohio. Projects worked on during
this period were in the fields of highway design geophysics; engineering
design geophysics, both bridge and dam site, and hydrology. Operations
were conducted in the midwest and the province of Ontario, Canada.
From 1963-1965 employed by the Ohio State Engineering Experiment
Station, Ohio State University,and conducted research with and the
evaluation of geophysical tools and techniques to be used to solve
engineering problems.
From 1965 to the present, employed as a geophysicist by the Atlantic
Richfield Company. From October, 1968 to the present, being employed in
the field of uranium exploration and airborne geophysical techniques.
Jack C. Zahn Mining Geophysicist
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REQUIRED INFORMATION
Airborne Magnetic Survey
Company)
Aircraft:
Instrument:
Dates Survey Flown:
Geophyelsist:
Atlantic Richfield Canada Ltd., 4 King Street W, Toronto, Ontario*
Turbo-Beaver
Varian type V-4937A Transportable Magnetometer.
Between October 28 and 30, 1969.
Jack C. Zahn,c/o Atlantic Richfield Co.,1500 Security Life Bid.,1616 Glenarm.Denver, Colorado 80202.
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41J16SWel27 6821C 1 JOGUES 900
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ONTARIO
THE MINING ACT REPORT OF WORK
Recorder of ...........i..,,.........,*.. .... ,. ,
A itporot* form Is r*qulr*d for eoch lypi of work to b* r*cord*d.
Robert A. MacGregor K. 15070
•.H' '
vision
name of Recorded Holder Miner's Licence Box 1700, Elliot lake, Ontario " ^- .
m -r* ,' :fi":
'"
'do hereby report the performance of ....... .,,,,™,.. doysf ..
not before reported to be opplied on the following contiguous cloims
Claim No. Days Claim No. Days
. type of work
See attached schedule. ....... , ,Mj
r...... \ \i [ i-"iSi:nj5. MARIE n nm ' Mi
All the work wo* perfotme'd on Mining Cloim (s) .....(In the cose of geological and/or geophysical survey (s) where more than 18 claims ore involved attach o schedule)
READ CAREFULLY: THE FOLLOWING INFORMATION is REQUIREP BY THE MINING RECORDER.
For Monuol Work, Stripping or Opening up of Mines, Sinking Shafts or Other Actual Mining Operations - Names and
oddresses of the men who performed the work ond the dates and hours of their employment.
For Diamond ond other Core Drilling - Fpotoge, No. ond angle of holes ond diameter of core. Name ond address of
owner or operator of drill. Dotes when drilling was done. Signed core log ond sketch in duplicate.
For Compressed Air or Other Power Driven or Mechanical Equipment
Type of drill or equipment. Nomes ond oddresses of men engoged in operoting equipment ond the dotes ond hours of
their employment.For Power Stripping - Type of equipment. Nome and address of owner or operator. Amount expended. Dotes on which
work was done. Proof of actual cost must be submitted within 30 days of recording.
With each of the obove types of work sketches ore required to show the location one1 extent of the work in relation
to the nearest claim post.' In the case of diamond or other core drilling the sketch must be submitted in .duplicate.
For Geological ond Geophysical Survey - The names ond oddresses of men employed os well as dotes. Type of
instrument used in the cote of geophysicol survey. Reports ond maps in duplicate must be filed with the Minister
within 60 days of recording.For Land Survey - the name and address of Ontario Land surveyor.
The Required Information is os Follows: (Attach o list if this spoce is insufficient)
See attached list,
c. a.
/''^/** 'f..
Signoture o' Recorded Holder or Agent
The Mining Act Certificote Verifying Rtpor'
Thorncllffe Pk. Dr., Toronto, Ontario•S-SIM* i 5
hereby c ertify:l, Thot l hove a penonol ond inlimote knowledge of the facts set forth in the repv* " *"'- annned here*
lo, having performed the woik or witouted som^ during ond 'or after its completion.
1, Thot thr annexed tepoit is true,
Daied,...^! 1 ?:. ........... 19.?.?:. ...,, - '\...^' . ' ..,,,,,,,,
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HACE (NORTH)
CLAIM NO.
SSM 207977207978207979207980207981207982207983207984207985207986207987207988207989207990
DAYS
4040404040404040404040404040
CLAIM NO.
SSM 207991207992207993207994207995207996207997207998207999208000228447228448228449228450
DAYS
4040404040404040404040404040
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^COMINCO
Twp !62KE:RR-MCGEE
McPhar KEM-VLF Receiver Cutler Maine Transmitter
17.8 KHz= VLF anomaly without aeromagnetic anomaly
coincidence.
O = VI.F anomaly with aeromagnetic anomaly co incidence.
N
MACE LAKE : ONTARIO
Claim Map
Scale :1 inch = 1 32O feet AtlanticRichfieldCompany
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MACE LAKE, ONTARIOCLAIM MAP
AEROMAGNETIC MAP
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' Claim HaWP.
DISTRICT OF
ALGOMA
SAULT STE. MARIEMINING DIVISION
PATENTED LAND
CROWN LAND SALF
LEASES
LOCATED LAND LICENSE OF OCCUPATION MINING RIGHTS ONLY SURFACE RIGHTS O NLYROADSIMPROVED HOAOS
KING'S HIGHWAYS
RAILWAYS
POWER LINES
MARSH OR MUSKEG
MINES
CANCCLLED ;
PLAN NO.
H 40 CHAINS
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