RPT ON VLF-EM SUR - WALLS TWP PROP · further EM, magnetics and ... up by gound surveys and one...

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42B13NW8282 2 .10232 WALLS 010

REPORT ON THE

VLF-EM SURVEY

ON THE

WALLS TOWNSHIP PROPERTY

OF

MAUREX RESOURCES LIMITED

RECEIVED": j

JUL 27 19871

MINING LANDS SECTIOIf

by

Greg Hodges, B.Se.

Robert S. Middleton Exploration Services Inc

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l l l l l l l l l l l l™ Fig.1 Property Location - Regional

I Fig.2 Property Location - Local

Fig.3 Claim Map

g Back Pocket———————————VLF Maps

42B13NW0202 2 ,1 e232 WALLS 010C

TABLE OF CONTENTS

ABSTRACTS .............................................. 1

INTRODUCTION ........................................... 1LOCATION AND ACCESS .................................... 1

CLAIM STATUS ........................................... 1&2GEOLOGY ........ ........ ................................ 2

PREVIOUS WORK .......................................... 2SURVEY PROCEDURE ....................................... 3&A

PERSONNEL AND EQUIPMENT ..........................,..... 5

SURVEY STATISTICS ...................................... 5

INTERPRETATION ......................................... 5

CONCLUSIONS AND RECOMMENDATIONS ........................ 6

CERTIFICATE ............................................ 8

REFERENCES .............................................. 7

APPENDIX A .........Equipment Specifications ........... 9

List of Figures


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ABSTRACT

A VLF-EM survey was conducted on the Walls Township

property of Maurex Resources Limited. The property is in

two blocks, one of 9 claims and one of 12 claims.

Several significant anomalies were detected, flnd further EM, magnetics and geological mapping are recommended.

INTRODUCTION

During the period from April 17 to April 30, 1987

a geophysical survey was conducted on the Walls Township Property of Maurex Resources Limited by Michael Tremblay.

The survey consisted of VLF (Very Low Frequency) electromagnetics and was conducted to aid in assessing the

economic mineral potential of the property.

LOCATION AND ACCESS

The property is located in Walls Township, District

of Cochrane, Ontario, approximately 80k due south of Hearst, Ontario. Access to the property is from Hearst via the

Caithness road to the Levesque Lumber camp in Minnipuka Twp.

(80km). From there the Goat River road is followed to the

Boomerang branch which crosses the property. (figure l 4 2)

CLAIM STATUS

The property is made up of two groups of clailrts,

one of 9 claims and one of 12 claims in the Porcupine

Mining Division. The claim numbers are:

Claim No. Recording DateGrid 1=--=== 9 16000 - 916008 9 May 14, 1986

Grid 2- = = = = = 9^997 . 915999 3 May 14, 1986

916009 - 916014 6 May 14, 1986 916287 - 916290 3 May 14, 1986

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CLAIM STATUS (cont'd)

These claims are held by Maurex Resources Limited

in their staker's name, Michael Tremblay.

GEOLOGY

The property is located in an area of mafic to intermediate metavolcanic flows and felsic intrusives with

minor metasedimentary (greywacke) units, felsic volcanic units and ultramafic intrusives (thoroughly serpentinizgd) (Thurston et. al. 1977). There are numerous early to middle Pre-Cambrian diabase dikes throughout the region,

generally striking northeast or west-northwest.

The metavolcanic rocks are mostly amphibolite

grade and - , andesitic in composition. The felsic intuslves

are granodioritic in composition.

The property has never been mapped in detail.

PREVIOUS WORK

In 1957, Sand River Gold Mining company drilled a hole on the west side of the Pichogen River near the CNR

line. The entire hole was drilled in magnetite bearing

serpentinite with trace amounts of sulphide. Gold assays

were apparently not reported.

"In 1981 Amax Mineral Explorations Limited and Noranda Explorations Limited Jointly con ducted aerial magnetic and electromagnetic surveys over the property. This was followed up by gound surveys and one drill hole of 66.5 m. The drill core along with the assay results are on file with the Ministry of Northern Development and Mines in Timmins. The one intersection from 32.0 to 33.4 m contained 6.02 pmm gold (.1750 pt) in massive pyrite and


Figure 1

PROVINCE OP ONTARIO

REVISIONS XOBERT EXPlORATtOf

tor

MIDDLETON SERVICES INC.

Maurex Resources LimitedTill*Property Location A Regional

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N.T.S.:File:

ROBERT S. MOOLETON EXPLORATION ^ERVITFR INC

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REVISIONS ROBERT

for

S. MIDDLETONEXPLORATION SERVICES INC.

MAUREX RESOURCES LIMITED

flAIM MAP WALLS TWP.

(Mie:Drawn:

Scale: N.T.I;File:


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pyrrhotite. The host rock was togged as being metagraywacke. No further work was reported and the claims were allowed to lapse.

In 1986 the Ministry of Northern Development and Mines conducted a r egional aerial survey over the region. Several conductors were noted on the property."

SURVEY PROCEDURE

Theory

The VLF (Very Low Frequency) electromagnetic system is a frequency domain system which uses military transmitters designed to communicate with submarines as a source. The system measures the response of conductors to these time varying electromagnetic fields.

The transmitted, or primary EM field is a sinusoid- ally varying field in the range of 15.0 to 30.0 KHz, depen

dant on the source station used. This field induces an electromotive force (emf), or voltage in any conductor through which the field passes. This is defined by

fE.dl = ^J2 t (The Faraday Induction Principle)

where E is the electric field strength in volts/metre(and so jJE.dl is the emf around a closed loop) and Gf is the magnetic flux through the conductor loop. This emf causes a secondary electromagnetic field, which is measured by the receiver.

The VLF transmitting antennae are vertically oti- ented, thus the primary field is horizontal perpendicular to the transmission direction.

The secondary field from a conductor is different in amplitude from the primary, and shifted in phase.


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Theory (cont'd)

Because both fields are sinusoidal, the resultant elec

tromagnetic vector traces an ellipse. The receiver

measures two of the following properties of the ellipse:

orientation of the minor axis (tilt), ratio of minor to

major axis (ellipticity), or amplitude of the minor axis

(field strength).

The receiver has two receiving coils built in, one coil with a normally vertical axis and the other

horizontal. The signal from the vertical axis coil is

first minimized by tilting the instrument. The remaining signal in this coil is finally balanced out by a measured percentage of signal from the horizontal coil, after being

shifted in phase by 90 .

Assuming the secondary signal is small compared to

the primary field, the mechanical tilt angle is an accurate

measure of the vertical real (in phase) component of the

secondary, and the 90 compensation signal from the hori zontal coil is a measure of the quadrature vertical signal.

Field Method

A transmitter station is selected which giveS a

strong field as close as possible to right angles to the

suspected strike of the geology.

The reference (horizontal) coil is oriented

parallel to the primary field, and then the instrument is

tilted until the minimum is heard. The quadrature component

(compensator) is then adjusted until a further minimum is

reached, and the tilt angle and compensation field redorded

as in phase and quadrature field in percent.

Readings are normally taken at 25m intervals. Shorter

spaced readings may be taken unless the data is to be Fraser

Filtered for plotting.


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PERSONNEL AND EQUIPMENT

The survey was conducted by Michael Tremblay for Maurex Resources Limited. The receiver was a Geonics EM16, using the Annapolis VLF transmitter (21.4 kHz). The speci fications for this instrument are in Appendix A.

SURVEY STATISTICS

The survey consisted of 40.35 line km of single

station VLF-EM data.

INTERPRETATION

Numerous conductors were detected on both properties, but the 12 claim property (Grid 2) shows the more promising anomalies.

This grid has many disjointed and isolated anpmalies, but no strong indications of significant conductors. Much of the grid appears to be masked by conductive overburden (swamp) extending roughly over the area outlined by the dashed line on the map.

This Grid has several moderate-to-strong anomalies, all of which trend west-northwest. Some of these definitely coincide with the anomalies detected by the Ontario Geological Survey airborne EM survey of the Oba Kapuskasing region (map 80834). These airborne anomalies are part of a cluster around fiducial 3918-3920 on flight-line 22840. Due tp the error in photo-lay-down of airborne data it is not possible to match the ground VLF anomalies definitely to the airborne.

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CONCLUSIONS AND RECOMMENDATIONS

As the property has not been geologically mapped

in detail it is recommended that this be done soon. It is

probable that very little outcrop will be found but the

survey should be completed.

The VLF survey detected numerous conductors but

a more powerful EM system should be used on the property to

provide more information about the conductors and to dis^

tinguish between overburden sources and bedrock conductors.

A survey with the Apex Perametrics Max Min II i^

recommended using 444Hz, 1777Hz and 3555Hz with a 150m coil

spacing.

A total field magnetic survey is recommended to

assist a geologic mapping of the property by outlining

structure.

All three of these surveys would require that a

grid of survey line be cut.

Respectfully submitted,

Greg tfbdges ,^B . Se ,

Geopmysicist

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REFERENCES

Thurston, P.C., Siragusa, G.M., Sage R.P. 1977Geology of the Chapleau Area, Ontario Division

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of Mines, Geoscience Report 157

l (Accompanying Map 2221)

Tremblay, Michael 1987

I Property Report on Walls Township Property For Maurex Resources Limited

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APPENDIX A

SPECIFICATIONS

iEM16 VLF Electromagnetic Unit

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Pioneered and patented exclusively by Geonics Limited, the VLF method of electromagnetic surveying has been proven to be a major advance in exploration geophysical instrumentation.

Since the beginning of 1965 a large number of mining companies have found the EM16 system to meet the need for a simple, light and effective exploration tool for mining geophysics.

The VLF method uses the military and time standard VLF transmissions as primary field. Only a receiver is then used to measure the secondary fields radiating from the local con ductive targets. This allows a very light, one-man instrument to do the job. Because of the almost uniform primary field, good response Irom deeper targets is obtained.

The EM16 system provides the in-phase a nd quadrature components of the secondary field w ith the polarities indicated.

Interpretation technique has been highly developed particularly to differentiate deeper targets from the many surface indications.

Principle of OperationThe VLF transmitters have vertical antennas. The magnetic signal component is then horizontal and concentric around the transmitter location.

SpecificationsSource of primary field

Transmitting stations used

Operating frequency range

Parameters measured

Method of reading

Scale range

Readability

VLF transmitting stations.

Any desired station frequency can be supplied with the instrument in the form of plug-in tuning units. Two tuning units can be plugged in at one time. A switch selects either station.

About 15-25 kHz.

11) The vertical in-phase component (tangent of the tilt angle of the polarization ellipsoid). (2) The vertical out-of-phase (quadra ture) component (the short axis of the polarization ellipsoid compared to the long axis).

In-phase from a mechanical inclino meter and quadrature from a calibrated dial. Nulling by audio tone.

In-phase ± 150 07o; quadrature ± 407o.

± 1"Xo.

Reading lime 10-40 seconds depending on signal strength.

Operating temperature range —40 to 50" C.

Operating controls

Power Supply

Dimensions

Weight

Instrument supplied with

Shipping weight

ON-OFF ^witch, battery testing push button, station selector, switch, volume control, quadrature, dial ± 40 07o, inclinometer dial ± 150 eXe.

6 size AA (penlight) alkaline cells. Life about 200 hours.

42 x 14 x 9 cm (16 x 5.5 x 3.5 in.)

1.6kg(3.5lbs.)

Monotonic speaker, carrying case, manual of operation, 3 station selector plug-in tuning units (additional fre quencies are optional), set of batteries.

4.5 kg (1() IDS.)

Designers fi manufacturers of ge0physica | instruments

subsidiary of Deering Milliken Inc.

2 ThOrncliffe Park Drive,Toronto/Ontario/CanadaM4H1H2Tel: f)25-1824Cables: Geonics

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CERTIFICATION

I, D. Greg Hodges, of 136 Cedar Street South, in the city of Tiramns, Province of Ontario, certify as follows concerning my report on the Maurex Resources Limited property in Walls Township, Province of Ontario and dated July 24, 1987:

1. I am a member in good standing of the Society of Exploration Geophysicists

2. I am a graduate of Queen's University at Kingston, Ontario, with a B.Se. (Hons.) Geological Sciences with Physics, obtained in 1980.

3. I have been practising in Canada, and occasionally in the United States, Europe, and Australia for the past seven years.

4. l have no direct interest in the properties, leases, or securities of Maurex Resources Limited, nor do I expect to receive any.

5. The attached report is a product of:

a) Examination of data included in the report which was collected on the property concerned.

Dated this July 24, 1987 Tinrains, Ontario

D. Gpgg Hodges, Geophysicist

Ministry ofNorthern Developmentand Mines

Ontario

Report of Work(Geophysical, Geological, Geochemical and Expenditures)

Mining42813NW8202 2 .10232 WALLS 900

Type of Survey(s)

Claim Holder(s) ^^^-^ ,

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Survey Company ,

/V\. W. "Trrmb/*/Name and Address of Author (of Geo-Technical report)

Township or Area ^ ! l. -

Date of Survey (fron

L V 1 L 1 fr7

Prospector's Ucerfce No.i* ^ ^ U * j ^^^9/VI- *L166 s

1 fif to) n f" v ~J

Day Mo. | Yr.

Toisl Miles of line Cut

Tci-oîc rt C S *3 fr^SCredits Requested per Bach Claim in Columns at right Mining Claims Traversed (List in numerical sequence)Special Provisions

For first survey:

Enter 40 days. (This includes line cutting)

For each additional survey: using the same grid:

Enter 20 days (for each)

Man Days

Complete reverse side and enter total (s) here

Airborne Credits

Note: Special provisions credits do not apply to Airborne Surveys.

Geophysical ^per

- Electromagnetic -j O y-s

- Magnetometer

* Radiometric

- Other i

Geological

Geochemical

Geophysical ^^

- Electromagnetic

- Magnetometer

- Radiometric

- Othert

Geological

Geochemical

Days per

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Magnetometer . 1QO7 .ill } 'i I JO l'

Radiometric

Expenditures (excludes poWHfttjvjepi^^QU SECTIONType of VVork Performed

Performeo en Claim(s)

Calculation of Expenditure Days Credits Total

Total Expenditures Days Credits

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InstructionsTotal Days Credits may be apportioned at the claim holder's choice. Enter number of days credits per claim selected in columns at right.

Date

Certification Verifying Report of Wofk

claims covered by this report of work.

l hereby certify that l have a personal and intimate knowledge of the facts set forth in the Report of Work annexed hereto, having performed the^vork or witnessed same during and/or after its completion and the annexed report is true.

N.imo and Postal Address of^gettO" Cortitymi

^JA^^:e Certified 7

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RPT ON VLF-EM SUR - WALLS TWP PROP · further EM, magnetics and ... up by gound surveys and one...

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Transcript of RPT ON VLF-EM SUR - WALLS TWP PROP · further EM, magnetics and ... up by gound surveys and one...