42A13SEW96 63.1327 REID

REPORT

ON

010

KLECmuMAGHETIC SURVEY

PERFORMED FOR

ME3PI MINES LTD. TORONTO

ON THEIR

raCRBUMUlOBERLY GROUP

PORCUPINE MIMING DIVISION

WORK BT

KESPI MINES LTD.

TIMKINS, OCT.

WORK COHDUCTED BETWEEN JANUARY 1 25/66

AUGUST 10/66 J.E. STEERS

DBRODUCTIO.N

A Crone J.E.M. survey was carried out on a group of

29 claims in Thorburn and Moberly Townships by Mespi Mines Limited

during the period from January 4 to January 25, 1966. The claims

are recorded in the name of Mespi Mines LJpited of 1705 Victory

Building, 80 Richmond Street, West, Toronto, Ontario

LOCATION AND ACCESS

The 29 contiguous claims from a group situated in the

southwest corner of Moberly township and the southwest corner of

Th*6burn township. The group is some 18 miles northwest of

Timmins, Ontario.

A somi-pormanent tent camp located on Footprints Lake

in Loveland township served as the ba.^o camp for the survey.

Motorized toboggans were used and transport the crew along the

Loveland-Thorbum township line.

msvious WORKMost of the claim group has been covered by two com

bined airborne magnetic and electromagnetic surveys.

Canadian Aero Mineral Surveys flew the ground along

notherly bearing flight lines at 1/8 mile spacing for B.W. Lang

in 1963.

The area was reflown by Hunting Surveys Corporation

along northeasterly bearing lines at 3/8 mile spacing for Mespi

Mines Limited in May, 19&.

Doth surveys indicated the presence of several elec

tromagnetic conductors.

INSTRUMENTS USED AND SURVEY METHOD

A Crone dual frequency transceiver unit was used for

the electromagnetic survey. The survey was performed employing

the in-line method and a 300 foot coil separation. Readingst

were taken at 100 foot intervals and the resultant dip angles

were plotted at the mid'point between the coils.

A total of 29,5 miles of lino were cut and 1332

stations were established, .

SURVEY RESULTS

Several anomalous areas were detected however little

correlation between linea is evident.

In general the conductive zones appear to have a

northerly strike and a vortical or near vertical dip.

The patterns established in this area are similar to

those established further south in Loveland township whore there

are several short, discontinuous sulphide lenses arranged in

semi-parallel, en echelon fashion.

CONCLUSIONS AND RECCMMBMDATIOHS

Itlis strongly recommended that each of the anomalous

zones be checked using dual frequency vertical loop equipment

and a fixed transmitter method.

Due to the limited strike length of the conductors it

will probably be necessary to cut intermediate lines at two

hundred foot intervals in order to detail the conductive aones.

Each detail area should be surveyed with a magnetometer.

Any decision as to diamond drilling should be deferred

pending the results of the detail magnetic and electromagnetic

work.

Respectfully submitted

JES/Jfr.E. St o e re Exploration Manager

7,

^INTRODUCTION020

During the period from Oct. 19/65 to March 31/66 a Crone J.E.M. survey

was conducted by Me s pi Mines Limited of 1705 Victory Bldg., 80 Richmond St.

West, Toronto, Ont. on one of their clalra groups in Reid Township.

LOCATION AND ACCESS

This group of 26 claims is located in the northwest quadrant of Reid

Township, Porcupine Mining Division and is some 18 air miles northwest of

the town of Timmins.

A tent camp was established on Thorburn Lake some l 1/2 miles southwest

of the group to accomodate field crews and motorized sleds were used to

transport the men between Thorburn Lake and the Reid claim group.

WCKK

The group was covered by two combined magnetic and electromagnetic airborne

surveys.

Canadian Aero Mineral Surveys flew the ground in a northwest direction

using 1/8 mile flight line spacing for B.W. Lang in 1963.

The area was reflown in May 1964 by Hunting Surveys Corporation for Mespi

Mines Ltd.. Northeasterly flight lines spaced at 1/8 mile intervals wet** used.

Both surveys established the presence of several electomagnetic anomalies

associated with a striking magnetic feature.

INSTRUMENTS USED AND SURVEY METHOD

A Crone dual frequency transceiver unit was used for the electromagnetic

survey. The survey was carried out using the in-line method, a coil separition

of 300 feet arid readings were taken at 100 ft* intervals(50 ft. in anomalous)

areas) The dip angles shown on the plan are resultant dip angles and are plotted

at the mid point between the coils.

ifec&use the airborne surveys had indicated the presence of anoaalous conditions

mon northeast anc- northwest lines it w.r;- dec^idod t.o cross fcrid the entire

area.

A total of 21,5 mi].?-, of lire wore cut and 1138 station" were established.

SURVLT /tlSUI-TS

For much of the area there is ne overburden response however several

rather localised anomalous ai^ps were indicated on both northeast and

northwest line p, .'Tie anonia3.1o5. .:;re of only moderate strength and show

little continuity however the ratios of low to high frequency dip angles

indicate fair to moderate conductivity,

li is extremely difficult to do any interpretation on the basis of the

information availahlc,

^2L^^L^L^^M?J^^.

It i s common k1 , owl*--o f'.c that, much of the aro? surround i nr this claim f.reup

is covered by ISO to 200 f e -t of overhuruen r.nd that, the rocks underlying

the for-'! r burden are part of - \ s edlr'inntnr,;i'--'f,lca'.ic coplex.

If the claim f^roup ip covered by a like thickness of overburden then

any bedrock conductor would be expected t.o appear as a wt;a,k conductor

if it was located at all,

These facts coupled with the fact that there is no overburden response over

much of the area leads the writer to believe that more detail work in this

area is called for

It is recommended that e dual frequency vertical loop survey be conducted

in the anomalous areas. If the results of the vertical loop survey ara

anomalous it is further recommended that detail grids be cut and a magnetic

survey be carriad out..

Respectfully submitted

1TOJT MINES J,TO. -V1.;, Steers, Oeolo^ist.

42A13368896 63.1327 REID 030

REPORT ON THE CONDUCT OF AN AIRBORNE GEOPHYSICAL SURVEY IN THE DISTRICT OF COCHRANE

On the following dates May l, 4 and 8, 1964, Hunting

Survey Corporation carried out flying operations on a combined

magnetometer and electromagnetometer survey over parts of the

townships of Geary, Mahaffey, Moberly, Thorburn, Reid and

Loveland.

The work was carried out under contract to Mespi Mines

Limited.

The location of the area surveyed is sho.;.T on a map

accompanying this report.

Two data men were stationed in Titnnun^ to ve preliminary

information to the client.

Final plotting and preparation of maps were carr

out in Hunting's Toronto office.

FLYING SPECIFICATIONS

Flying was carried out by a Beechcraft 18 with a crew of

four, i.e. pilot, instrument operator, electronic technician and

aircraft engineer.

The technician and engineer did not accornp,.: )

aircraft on all survey flights.

Traverses were flown in a Northeast-Southwest ci rtion "\

at an average spad: of 660 feet.

Terrain ci^.rance was maintained between 450 ....d SOO .

feet, where safety would permit.

- 2 -

Thirty-eight traverses were flown over the area,

for a total of 381.5 linear miles.

INSTRUMENTATION

The following instruments were operated during the

survey:

1. Gulf magnetometer.

2. Hunting Survey Corporation - Canadian Applied Research Limited

dual frequency electromagnetometer measuring the phase

displacement of the resultant field with respect to applied

field; for frequencies of 400 and 2,300 cycles per second.

3. Modified APN-1 radio altimeter.

4. C.A.R.L.-H.S.C. 35mm discrete frame positioning camera.

5. A four channel curvilinear recorder, showing from top to

bottom:

(1) Altimeter record and camera fiducial pulses.

(2) Magnetometer profile showing variations in the strength

of the earth's magnetic field, sensitivity 100-gammas

per centimeter across a four centimeter channel.

(3) Phase angle of the resultant field with respect to a

2,300 cycle applied field, sensitivity 2 0 per centimeter

across a four centimeter channel.

(4) Phase angle of the resultant field with respect to a

400 cycle applied field, sensitivity l 0 per centimeter

across a four centimeter channel.

- 3 -

6. A two pen rectilinear recorder with a five inch recording

width, showing:

(1) In red ink the terrain clearance record and camera

fiducial pulses.

(2) In black ink the variations in strength of the earth's

magnetic field, sensitivity 100-gammas per inch.

NOTE: A pulse was shown on the altimeter record, co-incident

with every tenth exposure of the 35mm camera.

This served to relate the records to the terrain over

which they were made.

The magnetometer and E.M. detectors were located in

separate "birds" towed behind and below the aircraft.

MAPS AND DATA COMPILATION

Navigation mosaics were prepared on a scale of l inch

to 2,640 feet utilizing "Overthrust" mosaics available to the

contractor.

For preparation of base maps, uncontrolled mosaics were

made on a scale of l inch to 1,320 feet, utilizing photographs

obtained from the Department of Lands and Forests (Year 1961

photography).

Flight path was established by visual comparison of the

35mm film with the above mentioned mosaics.

Base maps were traced from these mosaics also, showing

recognizable planimetric features.

Township boundaries shown on the base maps were positioned

by reference to Ontario Department of Mines claim maps.

*- 4 -

A map was compiled showing:

(a) flight traverses and

(b) magnetic contours referred to an arbitrary datum.

Contour interval was 20 gammas.

A second map was prepared showing:

(a) flight traverses.

(b) extent and location of the peak of the observed

low frequency anomalies.

(c) extent of residual low frequency anomalies.

(d) the phase angle of observed high and low

frequency anomalies read at peak values.

(e) the phase angle of residual high and low frequency

anomalies read at peak values.

(f) value and location of magnetic peaks and lows,

referred to on arbitrary datum.

R. N. Parkinson P. Rng,

HUNTING SURVEY CORPORATION LIMITED

1

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