HELICOPTER-BORNE MAG VLF & EM ATWOOD L AREA PROJ

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52P88NE0eeS 2.9633 PETAWANGA LAKE 010

REPORT ON

COMBINED HELICOPTER-BORNE MAGNETIC, VLF AND ELECTROMAGNETIC

SURVEYATWOOD LAKE AREA, PROJECT

NORTHWEST ONTARIO

PS.C ^ v 1986

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for GOLD FIELDS CANADIAN MINING, LIMITED

byAERODAT LIMITED

July, 1986

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TABLE 52P08NE0ee5 Z.9633 PETAWANGA LAKE

1. INTRODUCTION

2. SURVEY AREA LOCATION

3. AIRCRAFT AND EQUIPMENT

3.1 Aircraft

3.2 Equipment

3.2.1 Electromagnetic System

3.2.2 VLF-EM System

3.2.3 Magnetometer

3.2.4 Magnetic Base Station

3.2.5 Radar Altimeter

3.2.6 Tracking Camera

3.2.7 Analog Recorder

3.2.8 Digital Recorder

3.2.9 Radar Positioning System

4. DATA PRESENTATION

4.0 Base Map and Flight Path

4.1 Electromagnetic Profiles

4.2 Airborne Electromagnetic Survey Interpretation

4.3 Apparent Resistivity Contours

4.4 Total Field Magnetic Contours

4.5 Vertical Gradient Magnetic Contours

5. INTERPRETATION S RECOMMENDATIONS

APPENDIX I - General Interpretive Considerations

APPENDIX II - Anomaly List

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LIST OF MAPS

Maps

1. Airborne Electromagnetic Survey Profiles

l l lm (Scale: 1:15,840)

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lB (a) Inphase and Quadrature Profiles of 935 Hz Coaxial

Response

j (b) Inphase and Quadrature Profiles of 4175 Hz Coplanar

Response

l (c) Inphase and Quadrature Profiles of 4600 Hz Coaxial

Response

l2. Interpretation Map (with Anomaly Peaks, Conductivity -

l Thickness Range and Sensor Elevation).

l 3. Apparent Resistivity Contours from High Frequency Coaxial

Response

l4. Total Field Magnetic Contours

l5. Vertical Magnetic Gradient Contours

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1. INTRODUCTION

l This report describes an airborne geophysical survey carried out

on behalf of Gold Fields Canadian Mining, Limited by Aerodat

l Limited. Equipment operated included a three-frequency electro-

M magnetic system, a high sensitivity cesium vapour magnetometer,

a two frequency VLF-EM system, a tracking camera, an altimeter

l and a radar positioning system. Electromagnetic, magnetic and

altimeter data were recorded both in digital and analog form,

l Positioning data were stored in digital form and on film as

M well as being recorded manually by the operator in flight.

l The survey in the Miminiska Lake area of northwestern Ontario,

was flown on June 15th to June 17th, 1986. Four flights were

l required to complete the survey with flight lines oriented at an

azimuth of approximately 167 degrees and were flown at a nominal

* spacing of 100 metres. Coverage and data quality were considered

j to be well within the specifications described in the contract.

l The purpose of the survey was to record airborne geophysical

data over and around claims that are of interest to Gold Fields

* Canadian Mining, Limited.

lA total of 618 kilometres of the recorded data were compiled in

l map form and are presented as part of this report according to

specifications outlined by Gold Fields Canadian Mining,

Limited.

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2. SURVEY AREA LOCATION

The survey area is depicted on the index map shown below. It is

centred roughly at Latitude 51 degrees 26 minutes north, Longi

tude 88 degrees 15 minutes west, approximately 130 kilometres

east of Pickle Lake in northwestern Ontario (1:250,000 NTS Refer

ence Map No. 52P). The survey lies within the Thunder Bay Mining

District and the general area is accessed from Pickle Lake by

float plane.

51*25'

ll *m 3. AIRCRAFT AND EQUIPMENT

l3.1 Aircraft

l The helicopter used for the survey was an Aerospatiale

A-Star 350B owned and operated by Lakeland Helicopters

B Limited (C-GATX). Installation of the geophysical and ancil-

tt lary equipment was carried out by Aerodat. The survey air

craft was flown at a mean terrain clearance of 60 metres.

l3.2 Equipment

H 3.2.1 Electromagnetic System

m The electromagnetic system was an Aerodat 3-frequency

system. Two vertical coaxial coil pairs were operated

l at 935 and 4600 Hz and a horizontal coplanar coil

pair at 4175 Hz. The transmitter-receiver separation

l was 7 metres. Inphase and quadrature signals were

g measured simultaneously for the 3 frequencies with a

time constant of 0.1 seconds. The electromagnetic

l bird was towed 30 metres below the helicopter.

f 3.2.2 VLF-EM System

The VLF-EM system was a Herz Totem 2A. This

B instrument measures the total field and quadrature

M components of the selected frequencies. The sensor was

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l towed in a bird 12 metres below the helicopter. The

transmitting stations used were NAA (Cutler, Maine,

g 24.0 kHz) and NSS (Annapolis, Maryland, 21.4 kHz).

B 3.2.3 Magnetometer

B The magnetometer was a Scintrex Cesium optically

pumped high sensitivity type. The sensitivity of the

l instrument was 0.02 nT at a 0.1 second sampling rate.

The sensor was towed in a bird 12 metres below the

l helicopter.

3.2.4 Magnetic Base Station

l An IFG proton precession magnetometer was operated

at the base of operations to record diurnal varia-

I tions of the earth's magnetic field.

The clock of the base station was synchronized with

l that of the airborne system to facilitate later

correlation.

l3.2.5 Radar Altimeter

" A Hoffman HRA-100 radar altimeter was used to record

B terrain clearance. The output from the instrument is

a linear function of altitude for maximum accuracy.

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3.2.6 Tracking Camera

A Geocam tracking camera was used to record flight

path on 35mm film. The camera was operated in strip

mode and the fiducial numbers for cross-reference to

the analog and digital data were imprinted on the

margin of the film.

3.2.7 Analog Recorder

An RMS dot-matrix recorder was used to display the

data during the survey. In addition to manual and

time fiducials, the following data was recorded:

Channel

00

01

02

03

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06

07

08

Input

Altimeter (500 ft. at top

of chart).

Low Frequency Inphase

Low Frequency Quadrature

High Frequency Inphase

High Frequency Quadrature

Mid Frequency Inphase

Mid Frequency Quadrature

VLF-EM Total Field

VLF-EM Quadrature

Scale

10 f t ./mm

2 ppm/mm

2 ppm/mm

2 ppm/mm

2 ppm/mm

4 ppm/mm

4 ppm/mm

2.5%/mm

2.5%/mm

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l Channel Input Scale

09 VLF-EM Ortho Total Field 2.5I/mm

l 10 VLF-EM Ortho Quadrature 2.5%/mm

j 14 Magnetometer l gamma/mm

15 Magnetometer 10 gamma/mm

l3.2.8 Digital Recorder

l A Perle DAC/NAV data system recorded the survey on

g magnetic tape. Information recorded was as follows:

l Equipment Interval

EM 0.1 seconds

l VLF-EM Totem 2A 0.5 seconds

M Magnetometer 0.1 seconds

Altimeter 0.5 seconds

l MRS III 0.5 seconds

l 3.2.9 Radar Positioning System

' A Motorola Mini-Ranger (MRS III) radar navigation

system was utilized for both navigation and track

l recovery. Transponders located at fixed locations

were interrogated several times per second and the

l ranges from these points to the helicopter measured

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computer triangulates the position of the helicopter

l and provides the pilot with navigational information.

The range/range data were recorded on magnetic tape

* for subsequent flight path determination.

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ll *" 4. DATA PRESENTATION

l4.0 Base Map and Flight Path

l A photomosaic base at a scale of 1:15,840 was prepared by

enlargement of aerial photographs of the survey area.

U The flight path was derived from the Mini-Ranger radar

positioning system. The distance from the helicopter to two

l established reference locations was measured several times

per second, and the position of the helicopter calculated by

l triangulation. It is estimated that the flight path is

m generally accurate to about 10 metres with respect to the

topographic detail of the base map. The flight path is

l presented with fiducials for cross-reference to both the

;' analog and digital data.

lH 4.1 Electromagnetic Profile Maps

The electromagnetic data was recorded digitally at a sample

l rate of 10 per second with a time constant of 0.1 second. A

two stage digital filtering process was carried out to

J reject major sferic events, and to reduce system noise.

* Local sferic activity can produce sharp, large amplitude

B events that cannot be removed by conventional filtering

procedures. Smoothing or stacking would reduce their

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l amplitude but would leave a broader residual response that

could be confused with a geological phenomenon. To avoid

this possibility, a computer algorithm searched out and

rejected the major sferic events.

U The signal to noise ratio was further enhanced by the ap

plication of a low pass digital filter. It has zero phase

l shift which prevented any lag or peak displacement from

occurring, and it suppressed only variations with a wave

length less than about 0.25 seconds. This low effective

time constant permits maximum profile shape resolution.

l Following the filtering processes, a base level correction

was made. The correction applied was a linear function of

l time that ensured that the corrected amplitude of the

various inphase and quadrature components was zero when no

* conductive or permeable source was present. The filtered

and levelled data were then presented in profile map form.

The inphase and quadrature responses of the 4600 Hz and 935

Hz coaxial and the 4175 Hz coplanar configurations have been

presented along with the flight path and fiducials.

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4.2 Airborne Electromagnetic Interpretation Mapl

An interpretation map was prepared showing flight lines,

l fiducials, peak locations of anomalies and axes of any

possible bedrock conductors. The data were presented on a

l greyflex copy of the photo base map.

4.3 Apparent Resistivity Contours

l The electromagnetic information was processed to yield a map

of the apparent resistivity of the ground.

lB The approach taken in computing apparent resistivity was to

assume a model of a 200m thick conductive layer (i.e. ef-

I fectively a half space) over a resistive bedrock. The com-

; puter then generated, from nomograms for this model, the

l resistivity that would be consistent with the bird elevation

and recorded amplitude for the coaxial high frequency pair.

lM The apparent resistivity profile data were interpolated onto

a regular grid at a 25m true scale interval using a cubic

l spline technique.

The contoured apparent resistivity data were presented on a

greyflex copy of the photo base map with the flight path.

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4.4 Total Field Magnetic Contoursl

The aeromagnetic data were corrected for diurnal variations

l by subtraction of the digitally recorded base station mag

netic profile.

m The corrected profile data were interpolated onto a regular

grid at a 25m true scale interval using a cubic spline

l technique. The grid provided the basis for threading the

presented contours at a 2 nT interval.

• m The aeromagnetic data were presented with flight path infor

mation on a greyflex copy of the photo base map.

l' 4.5 Vertical Gradient Magnetic Contours

The vertical magnetic gradient was calculated from the

H gridded total field magnetic data. Contoured at a .2

nT/m interval, the gradient data were presented on the

l photomosaic base with the flight path.

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" 5. INTERPRETATION AND RECOMMENDATIONS

j Geology

l No geologic data was supplied to Aerodat by the client but pub

lished geologic maps were employed by the writer. The Ontario

B Department of Mines Geological Compilation Series Map 2237

m (Fort Hope - Lansdowne House) indicates that the central core

of the area is underlain (i.e., about one-half of the area) by a

l broad tongue of mafic to intermediate metavolcanics. A band of

metasediments lies along the north contract with granites

l whereas the southern metavolcanic/granite contact is mapped as a

M disconformity.

l Types of targets sought have not been identified although it is

assumed that the primary interest is in gold and silver minerali-

| zation that is known to occur throughout the general area.

Datal

l, The electromagnetic data were first checked by a line-by-line

l examination of the analog records. Record quality was very good

with only minor sferic interference; instrument noise was well

" within specifications although some chatter was evident on the

H low frequency coaxial channels. This was readily removed with a

smoothing filter. Geologic noise in the form of strong surficial

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B conductors, was recorded by the higher frequency responses but

was generally not too prominent over this survey.

lAnomalies were picked off the analog trace of the low frequency

l (935 Hz) coaxial response. These selections were checked with a

m proprietary computerized selection program on both the low and

high frequency coaxial responses and were further compared to

H the coplanar profile data.

l Conductor axes were then marked using line to line correlations

mm of the electromagnetic profiles. These conductors were grouped

into conductive zones on the bases of magnetic (and lithologic)

l correlations. In the description of the results, the terms "ap

parent conductivity" and "conductance" may have been used inter-

I changeably. Strictly speaking, this is incorrect as 'Conductance'

B refers to a computer quantity (i.e., the product of conductivity

X thickness) where as 'Apparent Conductivty' is the property of

l the bedrock or overburden being measured.

l Because of the high level of magnetic activity in the general

area, it was decided that the analog record of the coarse mag-

B netic trace was quite adequate, particularly in light of the

j quality of the high sensitivity magnetic trace. The coarse trace

- actually at a scale of 100 nTs per centimetre and at a sample

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slightest magnetic flextures.

lRESULTS

B Magnetics

The regional magnetic map (Geological Survey of Canada, Map

l 7009G) conforms to the geologic map in that the outline of the

metavolcanics/metasediments can be roughly defined by the magne-

I tically high values within the area of the survey. Relatively

mm little can be inferred from the regional magnetics as to the

structure and/or lithology within the metavolcanics.

lThe high resolution magnetic map generated by this survey should

l add considerably to the geologic interpretation.

* The overall detailed magnetic picture is that of a relatively

l thin sheet of shallow, south dipping, interbedded metavolcanics

and metasediments that form imbricate structures (rather than

l isoclinal folds) along east-west trending planes. A series of

near parallel, northwesterly trending structural linears also

show apparent vertical displacements in the underlying volcanics.

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l Athough the geologic map shows a band of sediments along the

northern volcanic/granite contact, one can assume that the

l volcanics are interbedded with a network of metasediments, includ

ing iron formation, throughout the area. A patch of magnetic

m lows within the volcanic outline at the western end of the block

m may represent a re-entrant of granites with a plug-like magnetic

high (mafic intrusive ?) centred on Line 1200.

lMajor structures evident on the magnetics appear to be a set of

near parallel linears trending at about Azimuth 120 degrees and

another 140 degrees set in the western quarter of the survey.

l The area mapped as granite shows a background pattern of west-

northwesterly linears that may reflect structure but are equally

|| likely to represent a set of narrow diabase dikes. Toward the

southwesterm quadrant of the block, these trends are decidedly

* flatter. The geologic map shows northwesterly striking diabase

M to the south of the area, closer to the structural breaks in

direction than to the magnetic linears.

lThe northeasterly trend in the southeastern corner of the survey

B appears to be an outlying band of metasediments with possibly

m an additional volcanic mass at the eastern boundary. The mag

netic highs in the northwestern corner reflect the volcanics

l shown on the geologic map.

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ll~ Electromagnetics

lThe results show a number of near east-west trending conductors

l confined almost entirely to the northern half of the survey.

Most of these conductors are associated with strong magnetic

l trends and negative inphase anomalies were generally recorded to

m the south of the conductors. Conductance is perceived as general

ly high with one or two zones of moderate apparent conductivity

l wherein the susceptibility effects have almost overriden the

conductivty effects on the inphase response but a strong, posi-

I tive quadrature response is present.

Based on the response amplitude and the degree of response in

l the higher frequencies - essentially quadrature response - over

burden probably averages less than 10 metres in thickness.

l Thirteen conductive zones, trends or individial bedrock conduc-

tors were mapped by this survey; a fourteenth is listed as a

l possible conductor. The assigned numbers are for purposes of

nomenclature and do not reflect priority.

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l Conductors l, la, Ib - (Lines 1130 to 1280);

This conductive zone, in the extreme northwest corner of the

l survey area, follows the south edge of a series of magnetic

highs. It represents the south contact of a volcanic belt to the

north of an intervening tongue of granite. Conductance is high

and apparent dip is to the north.

l Conductor II - (Lines 1190 to 1280);

Conductor li is a multi-banded zone the principal band which

l lies coincident with a strong magnetic linear trend. Both anom-

M aly amplitudes and apparent conductivities are the highest of

the zones detected in this survey. Dips generally appear to be to

l the north. The magnetic contour map shows a break at Line 1250

that is reflected (actually, between Lines 1240 and 1250) in the

f electromagnetic profiles.

Conductors III, Ilia - (Lines 980 to 1090 and Lines 860 to 940);

l These narrow conductive zones lie consistently along the north

contact of a sharp, strong magnetic anomaly. Conductance is high

J and apparent dip is steep but to the north. Conductor Ilia is

regarded as a continuation of III with a break, also shown on

* the magnetics, from Lines 950 to 970.

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Conductors IV, IVa - (Lines 521 to 721);lConductors IV and IVa are almost identical to the III, Ilia

l zones - in fact they appear to lie along the same magnetic trend

- with the exception of the east half of IV. Beyond {that is,

l east of) Line 600 the responses and conductances are more

m subdued. The magnetic trend along this section is also more

subdued and is discontinuous, possibly reflecting some influence

l by a northwesterly trending structure. Also, dip indications

' . along these conductors are steep but to the south.

m Conductor V - (Lines 210 to 330);

This zone of moderate conductance lies along the north contact

l of the large magnetic anomaly at the eastern end of the survey.

The offset in the conductor is due to structure and is sub-

stantiated in the magnetic pattern. Dips again are steep and to

the south.

M Conductor VI - (Lines 1260, 1270);

This two line anomaly of moderate to high conductance coincides

l with an equally short magnetic high. It can be interpreted from

the magnetic map that Conductor VI is actually an extension of

l a conductive trend about one kilometre to the east (conductors

m X, Xa). Some evidence of inphase suppression is seen on the

flanks of the sharp low frequency response on Line 1270. Dip

l appears to be steep and south dip is favoured.

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M Conductor VII, Vila, VIII and IX - (Lines 650 to 1030);

These zones of relatively low conductance have been grouped

l together as they are quite similar in their relationship to

magnetic and probably represent a local system of minor (imbri-

B cate ?) structures. Each conductor coincides with a minor or

l secondary magnetic peak and extends only over the length of its

corresponding magnetic zone. Conductor Vila appears to be separ-

I ated from VII by a relatively non -magnetic gap in the volca

nics, thought to be a thin wedge of the granitic intrusive. Dips

l are near vertical.j

Conductors X, Xa - (Lines 980 to 1170);

l Although spatially and probably lithologically related to Conduc

tors VII, VIII and IX, this zone differs in that the coinci-

| dent magnetic zone is stronger and conductances as well as res-

ponse amplitudes are much higher. The conductive zone is dual

' banded and for at least some of its length, straddles the nar-

row magnetic trend. North dip is also favoured.

l This zone is likely a continuation of Conductor II with a sharp

offset (down to the west) between Lines 1130 and 1140. The two

B gap (1090, 1100) is also present on the magnetics.

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Conductor XI - (Lines 1160 to 1270);lThis broad, mult i -conductor zone coincides with a similarly

B shaped area of magnetic highs although the conductive bands do

not necessarily fall along the magnetic peaks. At best, the

l relationship is inconsistent (e.g., see Lines 1190 to 1210).

m Conductances appear to be generally high (Lines 1230) and north

dip is favoured.

lconductor XII - (Lines 740 to 840);

l This zone of low to moderate cnductance appears to be coincident

M with or along the north contact of a strong magnetic trend.

Inphase suppression is evident on several lines (740 to 790) so

l that apparent conductivity may be higher than calculated.

Although the magnetics show a relatively flat south dip, both

north and south dips are indicated from the electromagnetic

profiles.

M Conductor XIII - (Lines 890 to 910);

Conductor XIII is essentially a two line, high conductance anom-

I aly that is coincident with a short lens of high magnetic suscep

tibility. Line 900 shows direct coincidence whereas the conduc-

I tors on Line 890 may straddle the magnetic peak. South dip is

m indicated on Line 900 in accordance with the magnetic interpre

tation. One is tempted to correlate this conductor to zone XI.

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M Conductor XIV - (Line 1180);

Conductor XIV is classes as a possible bedrock zone of low con-

I ductance. It coincides with a minor but isolated magnetic peak

and shows a probably south dip. This constitutes the only pos-

I sible - or definite - bedrock conductor over the southern half

m of the survey.

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l Apparent Resistivity

l The overall Apparent Resistivity values are quite high with the

. major resistivity contrasts (i.e., resistivity lows) showing up

" along the bedrock conductor trends. This suggests relatively

l thin, sandy overburden.

Jj The resistivity map also shows a surprisingly strong correlation

with the structural trends, particularly the northwesterly sets,

that were interpreted from the magnetics. This may be an indi-

M cation of vertical displacement along the structures; the con

trasts are too sharp to be due to surficial effects.

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li Discussion

lIt would appear, from the location maps supplied by the client,

l that considerable geologic and geophysical work has been done

over the area and in the general vicinity of this survey. Data

l from this previous work would be essential in the development of

m a thorough interpretation of this survey, particularly the high

sensitivity magnetics.

lThe coincident conductive-magnetic zones appear to be from low

l grade sedimentary iron formations with sulphide/graphite minera-

M lization. These zones are most consistent along the north gran-

ite/metasediment contact. Many of the stronger magnetics zones

l are weakly conductive, as evident from the quadrature response.

A study of the profile data - as typified by Lines 260, 310,

p 770, 860, 1020 and 1200 - provides an excellent example of the

relationship between conductivity and magnetic susceptibility

* within the survey block.

lThe almost total lack of conductive zones over the southern half

l of the survey can be largely attributed to the fact that gra

nites occupy most of this part of the survey. The numerous mag-

I ne tic, but nonconductive, bands may indicate an amphibolitic

m facies in the metavolcanics with the metasediments confined to

the north. Following the recognized lithologic models, this

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U would imply that the intervening magnetic low between, for

example, zones II and X may be an acidic facies of the metavolca-

l nics.

The northerly metavolcanic/metasediment contact with the gran

ite, along zones II and IV, probably marks a strong struc

tural event and parallels a series of such structures to the

l south. The northwest and west-northwesterly structural trends

appear to be later events. Structure in fact does not seem to

l have influenced conductivity other than to have turned the con-

M ductive bands on end.

Recommendations

l Without a fairly comprehensive geologic base, it would be dif-

ficult to recommend any one of the conductive trends over the

B others. Currently accepted geologic models favour zones of low

M to moderate conductance along a facies change from metasedi-

ments to metavolcanics. If this situation were to exist in this

l area, it would most likely be within conductive zones XI, con

ductor III and possibly the eastern end of Conductor IV.

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If a more detailed interpretation of this data is to be made, it

is recommended that a complete set of stacked profiles be gene

rated in order to get the full benefit of the high resolution

inherent in the data.

Respectfully submitted,

AERODAT

July, 1986

J8613.A

ll ~ STATEMENT OF QUALIFICATIONS

GEORGE PODOLSKY

l1. I reside at 172 Dunwoody Drive, OAKVILLE, Ontario.

l 2. I hold a B.Se. in Engineering Physics from Queen's Univer

sity (1954) and am a member of the Association of Profes-

I sional Engineers of the Province of Ontario.

3. l am a professional geophysicist, have been an active

l member of the Society of Exploration Geophysicists since

1960, and have worked in the minerals industry since 1954.

m 4. I have examined all the data obtained by Aerodat in the

course of their survey and this report is based on that

l examination.

l 5. I am an independent consultant and have no direct or indi-

m rect interest in Gold Fields Canadian Mining, Limited or

in any properties lying within the surveyed area.

l^* " George Podolsky

j^m a.f- f. Y" t" ****- m -. ^K.

July, 1986

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APPENDIX I

GENERAL INTERPRETIVE CONSIDERATIONS

l Electromagneticj^ The Aerodat three frequency system utilizes two different transmit-

" ter-receiver coil geometries. The traditional coaxial coil confi-

m guration is operated at two widely separated frequencies and the

horizontal coplanar coil pair is operated at a frequency ap-

I proximately aligned with one of the coaxial frequencies.

The electromagnetic response measured by the helicopter system is

a function of the "electrical" and "geometrical" properties of

the conductor. The "electrical" property of a conductor is de ter -

l mined largely by its electrical conductivity, magnetic suscepti

bility and its size and shape; the "geometrical" property of the

response is largely a function of the conductor's shape and

orientation with respect to the measuring transmitter and

receiver.

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lElectrical Considerations

l For a given conductive body the measure of its conductivity or

conductance is closely related to the measured phase shift

" between the received and transmitted electromagnetic field. A

B small phase shift indicates a relatively high conductance, a

large phase shift lower conductance. A small phase shift results

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in a large inphase to quadrature ratio and a large phase shift a

B low ratio. This relationship is shown quantitatively for a non

magnetic vertical half-plane model on the accompanying phasor

l diagram. Other physical models will show the same trend but

different quantitative relationships.

m The phasor diagram for the vertical half-plane model, as pre

sented, is for the coaxial coil configuration with the amplitudes

l in parts per million (ppm) of the primary field as measured at

the response peak over the conductor. To assist the interpre-

I tation of the survey results the computer is used to identify the

m apparent conductance and depth at selected anomalies. The results

of this calculation are presented in table form in Appendix II

l and the conductance and inphase amplitude are presented in symbo

lized form on the map presentation.

l The conductance and depth values as presented are correct only as

far as the model approximates the real geological situation. The

l actual geological source may be of limited length, have signifi

cant dip, may be strongly magnetic, its conductivity and thick -

B ness may vary with depth and/or strike and adjacent bodies and

overburden may have modified the response. In general the conduc-

B tance estimate is less affected by these limitations than is the

B depth estimate, but both should be considered as relative rather

than absolute guides to the anomaly's properties.

l

l

l

l l

H l

l l

l

l

- 3 -

l Conductance in mhos is the reciprocal of resistance in ohms and

in the case of narrow slab-like bodies is the product of elec-

I trical conductivity and thickness.

Most overburden will have an indicated conductance of less than 2

mhos; however, more conductive clays may have an apparent conduc

tance of say 2 to 4 mhos. Also in the low conductance range will

l be electrolytic conductors in faults and shears.

The higher ranges of conductance, greater than 4 mhos, indicate

that a significant fraction of the electrical conduction is

electronic rather than electrolytic in nature. Materials that

l conduct electronically are limited to certain metallic sulphides

'-, and to graphite. High conductance anomalies, roughly 10 mhos or

l greater, are generally limited to sulphide or graphite bearing

g rocks.

l Sulphide minerals, with the exception of such ore minerals as

sphalerite, cinnabar and stibnite, are good conductors; sulphides

f may occur in a disseminated manner that inhibits electrical

conduction through the rock mass, in this case the apparent

conductance can seriously underrate the quality of the conductor

B in geological terms. In a similar sense the relatively non

conducting sulphide minerals noted above may be present in

l

l il significant consideration in association with minor conductive

sulphides, and the electromagnetic response only relate to the

l minor associated mineralization. Indicated conductance is also of

little direct significance for the identification of gold minera-

I lization. Although gold is highly conductive, it would not be

m expected to exist in sufficient quantity to create a recognizable

anomaly, but minor accessory sulphide mineralization could pro-

I vide a useful indirect indication.

l In summary, the estimated conductance of a conductor can provide

H a relatively positive identification of significant sulphide or

graphite mineralization; however, a moderate to low conductance

l value does not rule out the possibility of significant economic

mineralization.

l Geometrical Considerations

* Geometrical information about the geologic conductor can often be

l interpreted from the profile shape of the anomaly. The change in

shape is primarily related to the change in inductive coupling

l among the transmitter, the target, and the receiver.

l

l

l

l

l

in the case of a thin, steeply dipping, sheet-like conductor, the

coaxial coil pair will yield a near symmetric peak over the

l l - 5 -

B conductor. On the other hand, the coplanar coil pair will pass

through a null couple relationship and yield a minimum over the

l conductor, flanked by positive side lobes. As the dip of the

conductor decreased from vertical, the coaxial anomaly shape

l changes only slightly, but in the case of the coplanar coil pair

m the side lobe on the down dip side strengthens relative to that

on the up dip side.

lAs the thickness of the conductor increases, induced current flow

l across the thickness of the conductor becomes relatively signifi-

mm cant and complete null coupling with the coplanar coils is no

longer possible. As a result, the apparent minimum of the co-

I planar response over the conductor diminishes with increasing

thickness, and in the limiting case of a fully 3 dimensional body

g or a horizontal layer or half-space, the minimum disappears

completely.

l A horizontal conducting layer such as overburden will produce a

response in the coaxial and coplanar coils that is a function of

l altitude (and conductivity if not uniform). The profile shape

will be similar in both coil configurations with an amplitude

B ratio (coplanarrcoaxial) of about 4:1*.

l

l

l

l

l l

l

- 6 -

H In the case of a spherical conductor, the induced currents are

confined to the volume of the sphere, but not relatively res-

l tricted to any arbitrary plane as in the case of a sheet-like

form. The response of the coplanar coil pair directly over the

sphere may be up to 8* times greater than that of the coaxial

pair.

l In summary, a steeply dipping, sheet-like conductor will display

a decrease in the coplanar response coincident with the peak of

l the coaxial response. The relative strength of this coplanar null

j is related inversely to the thickness of the conductor; a

pronounced null indicates a relatively thin conductor. The dip of

l such a conductor can be inferred from the relative amplitudes of

the side-lobes.

l

1 Massive conductors that could be approximated by a conducting

sphere will display a simple single peak profile form on both

l coaxial and coplanar coils, with a ratio between the coplanar to

coaxial response amplitudes as high as 8*.

lOverburden anomalies often produce broad poorly defined anomaly

* profiles. In most cases, the response of the coplanar coils

M closely follows that of the coaxial coils with a relative ampli

tude ratio of 4*.

l

l

l

l

l

l

lll Occasionally, if the edge of an overburden zone is sharply

defined with some significant depth extent, an edge effect will

l occur in the coaxial coils. In the case of a horizontal conduc-

tive ring or ribbon, the coaxial response will consist of two

peaks, one over each edge; whereas the coplanar coil will yield a

single peak.

l * It should be noted at this point that Aerodat's definition of

the measured ppm unit is related to the primary field sensed in

l the receiving coil without normalization to the maximum coupled

m (coaxial configuration). If such normalization were applied to

the Aerodat units, the amplitude of the coplanar coil pair would

l be halved.

l Magnetics

g The Total Field Magnetic Map shows contours of the total magnetic

3 field, uncorrected for regional variation. Whether an EM anomaly

l with a magnetic correlation is more likely to be caused by a

sulphide deposit than one without depends on the type of minera-

J lization. An apparent coincidence between an EM and a magnetic

anomaly may be caused by a conductor which is also magnetic, or

B by a conductor which lies in close proximity to a magnetic body,

j The majority of conductors which are also magnetic are sulphides

containing pyrrhotite and/or magnetite. Conductive and magnetic

l

l l

.

- 8

l bodies in close association can be, and often are, graphite and

magnetite. It is often very difficult to distinguish between

l these cases. If the conductor is also magnetic, it will usually

produce an EM anomaly whose general pattern resembles that of the

B magnetics. Depending on the magnetic permeability of the conduc-

M ting body, the amplitude of the inphase EM anomaly will be wea

kened, and if the conductivity is also weak, the inphase EM

l anomaly may even be reversed in sign.

l VLF Electromagnetics

m The VLF-EM method employs the radiation from powerful military

radio transmitters as the primary signals. The magnetic field

l associated with the primary field is elliptically polarized in

the vicinity of electrical conductors. The Herz Totem uses three

coils in the X, Y, Z configuration to measure the total field and

vertical quadrature component of the polarization ellipse.

l The relatively high frequency of VLF (15-25) kHz provides high

response factors for bodies of low conductance. Relatively "dis-

I connected" sulphide ores have been found to produce measureable

VLF signals. For the same reason, poor conductors such as sheared

contacts, breccia zones, narrow faults, alteration zones and

B porous flow tops normally produce VLF anomalies. The method can

l

l

l

l l - 9 -

l therefore be used effectively for geological mapping. The only

relative disadvantage of the method lies in its sensitivity to

l conductive overburden, in conductive ground the depth of explo-

ration is severely limited.

m The effect of strike direction is important in the sense of the

relation of the conductor axis relative to the energizing elec-

I tromagnetic field. A conductor aligned along a radius drawn from

a transmitting station will be in a maximum coupled orientation

l and thereby produce a stronger response than a similar conductor

m at a different strike angle. Theoretically, it would be possible

for a conductor, oriented tangentially to the transmitter to

l produce no signal. The most obvious effect of the strike angle

consideration is that conductors favourably oriented with respect

l to the transmitter location and also near perpendicular to the

flight direction are most clearly rendered and usually dominate

the map presentation.

l; The total field response is an indicator of the existence and

l position of a conductivity anomaly. The response will be a

maximum over the conductor, without any special filtering, and

" strongly favour the upper edge of the conductor even in the case

B of a relatively shallow dip.

l

l

l

l l

l

l l l

10

l The vertical quadrature component over steeply dipping sheet-like

conductor will be a cross-over type response with the cross-over

f closely associated with the upper edge of the conductor.

' The response is a cross-over type due to the fact that it is the

B vertical rather than total field quadrature component that is

measured. The response shape is due largely to geometrical rather

l than conductivity considerations and the distance between the

maximum and minimum on either side of the cross-over is related

to target depth. For a given target geometry, the larger this

distance the greater the depth.

l The amplitude of the quadrature response, as opposed to shape is

function of target conductance and depth as well as the conductiv-

| ity of the overburden and host rock. As the primary field

M travels down to the conductor through conductive material it is

both attenuated and phase shifted in a negative sense. The secon-

I dary field produced by this altered field at the target also has

an associated phase shift. This phase shift is positive and is

P larger for relatively poor conductors. This secondary field is^

— attenuated and phase shifted in a negative sense during return

™ travel to the surface. The net effect of these 3 phase shifts

l determine the phase of the secondary field sensed at the

receiver.

l l - 11

l A relatively poor conductor in resistive ground will yield a net

positive phase shift. A relatively good conductor in more conduc-

| tive ground will yield a net negative phase shift. A combination

is possible whereby the net phase shift is zero and the response

* is purely in-phase with no quadrature component.

lA net positive phase shift combined with the geometrical cross -

l over shape will lead to a positive quadrature response on the

side of approach and a negative on the side of departure. A net

l negative phase shift would produce the reverse. A further sign

m reversal occurs with a 180 degree change in instrument orien

tation as occurs on reciprocal line headings. During digital

l processing of the quadrature data for map presentation this is

corrected for by normalizing the sign to one of the flight line

l headings.j

l

l

l

l

l

l

l

y

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

APPENDIX II

ANOMALY LIST

f1111-

111111111111

PAGE 1

^ J8613 ANOMALIES, AREA A - ATWOOD LAKE

CONDUCTOR BIRD AMPLITUDE (PPM) GTP DEPTH HEIGHT

FLIGHT LINE ANOMALY CATEGORY INPHASE QUAD. MHOS MTRS MTRS

15

15

15

15

151515

15

1515

15

15

1515

1515

1515

15

1515

15

1515

15

15

15

130

150

210

220

230230230

240

250250

260

270

280280

290290

300300

310

330330

340

350350

360

370

380

Estimated

A

A

A

A

ABC

A

AB

A

A

AB

AB

AB

A

AB

A

AB

A

A

A

depth mayof the conductor mayline, or because of

0

0

0

0

000

0

00

0

0

00

00

00

0

00

0

00

0

0

0

bebea

3.3

3.3

14.4

14.6

6.74.7

11.9

4.8

5.86.5

15.2

9.1

4.96.2

5.14.3

4.25.8

9.4

5.97.1

7.0

16.66.0

10.4

10.4

7.9

unreliabledeeper orshallow dip

29.4

20.2

17.5

20.4

39.734.131.0

14.5

47.222.9

31.4

20.7

15.927.7

28.614.4

13.629.9

24.7

37.729.3

28.2

77.541.8

38.7

51.9

33.7

becauseto one

0.0

0.0

0.8

0.7

0.00.00.2

0.1

0.00.1

0.4

0.3

0.10.1

0.00.1

0.10.0

0.2

0.00.1

0.1

0.10.0

0.1

0.1

0.1

0

0

10

5

003

0

01

1

3

00

02

00

5

00

0

00

0

0

0

26

29

31

33

272725

38

2428

28

31

6440

3232

3733

26

2728

36

2127

35

27

37

the stronger partside of

or overburdenthe flighteffects.

1 111111111111111iii

PAGE 2

^ J8613 ANOMALIES, AREA A - ATWOOD LAKE

CONDUCTOR BIRD AMPLITUDE (PPM) GTP DEPTH HEIGHT

FLIGHT LINE ANOMALY CATEGORY INPHASE

15

15

15

15

16

16

16

17171717

1717

171717

17

17

17

1717

17

17

17

17

17

390

400

410

430

490

500

510

521521521521

530530

540540540

550

560

570

580580

590

600

610

620

630

Estimated

A

A

A

A

A

A

A

ABCD

AB

ABC

A

A

A

AB

A

A

A

A

A

depth mayof the conductor may line, or because of

0

0

0

0

0

0

0

0000

00

000

0

0

0

00

0

0

1

1

1

bebe a

14

5

4

2

3

2

3

4982

611

1362

8

19

12

316

4

6

22

29

18

.5

.8

.9

.7

.7

.6

.7

.0

.1

.7

.6

.6

.6

.4

.1

.6

.5

.1

.4

.5

.5

.7

.5

.3

.5

.3

unreliabledeeper shallow

or dip

QUAD.

72.9

27.6

34.6

20.9

36.9

33.9

31.9

18.832.546.019.9

30.326.2

36.129.722.4

29.1

42.6

26.1

21.130.7

20.4

22.3

25.7

27.7

19.0

because

MHOS

0.

0.

0.

0.

0.

0.

0.

0.0.0.0.

0.0.

0.0.0.

0.

0.

0.

0.0.

0.

0.

1.1.1.

the

1

0

0

0

0

0

0

0100

03

200

1

4

4

05

0

1

1

6

2

MTRS MTRS

0

0

0

0

0

0

0

0000

00

000

0

0

0

00

0

0

0

2

0

23

38

29

34

27

30

28

34302730

3537

333232

39

34

42

3433

41

40

39

34

43

stronger partto one side of or overburden

the flight effects.

1 1 11111111111111111

^ J8613 ANOMALIES, AREA A -

AMPLITUDE (PPM FLIGHT LINE ANOMALY CATEGORY INPHASE QUAD.

17 17

1717

17

17

17

17

17

1717

1717

1717

1717

171717

17

17

1717

17

171717

640 640

650650

660

670

710

720

760

770770

780780

790790

800800

810810810

820

830

840840

850

860860860

Estimated

A B

AB

A

A

A

A

A

AB

AB

AB

AB

ABC

A

A

AB

A

ABC

depth mayof the conductor may line, or because of

2 0

03

1

2

0

0

0

00

01

0101000

0

0

00

0

000

bebe a

29 4

237

24

34

6

6

4

122

928

328

925

145

16

10

47

4

284

.9

.8

.6

.2

.8

.3

.9

.6

.6

.9

.9

.8

.1

.5

.0

.5

.9

.8

.3

.0

.3

.6

.7

.2

.0

.7

.9

.4

unreliabledeeper shallow

or dip

18.3 17.3

14.618.1

19.7

21.8

13.8

12.6

41.6

35.913.0

26.235.7

19.827.6

13.732.6

11.414.69.9

32.4

19.8

18.720.1

18.9

14.124.115.4

because

PAGE 3

ATWOOD LAKE

CONDUCTOR BIRD ) GTP DEPTH HEIGHT

MHOS MTRS MTRS

2. 0.

0.4.

1.

2.

0.

0.

0.

0.0.

0.1.

0.1.

0.1.

0.0.0.

0.

0.

0.0.

0.

0.0.0.

the

8 1

01

9

8

3

3

0

20

20

05

50

012

4

4

12

0

021

3 0

06

3

6

12

6

0

00

00

02

43

003

2

0

00

0

040

strongerto one side of or overburden

39 34

3634

38

33

29

36

32

3735

3737

3134

4030

383642

28

42

3236

32

352736

partthe flight effects.


PAGE 4

J8613 ANOMALIES, AREA A - ATWOOD LAKE

CONDUCTOR BIRDAMPLITUDE (PPM) GTP DEPTH HEIGHT

FLIGHT LINE ANOMALY CATEGORY INPHASE QUAD. MHOS MTRS MTRS

17

171717

171717

171717

181818

181818

181818

18181818

18181818

181818

1818

1818

860

870870870

881881881

890890890

900900900

910910910

920920920

930930930930

940940940940

950950950

960960

970970

D

ABC

ABC

ABC

ABC

ABC

ABC

ABCD

ABCD

ABC

AB

AB

0

000

000

000

003

002

300

0000

0001010

00

00

2.4

2.612.25.2

20.96.72.7

6.91.68.3

11.36.0

49.2

1.84.6

31.2

56.66.25.5

15.48.12.73.9

2.81.7

17.629.6

2.944.926.6

13.06.6

7.89.4

9.8

12.220.616.9

27.622.620.7

13.011.222.3

23.721.722.8

3.620.117.4

20.225.222.1

33.826.07.7

21.4

11.510.226.432.1

15.940.935.8

20.619.1

22.533.9

0.0

0.00.50.1

0.90.10.0

0.30.00.2

0.30.14.8

0.10.03.3

7.10.10.1

0.40.10.10.0

0.00.00.71.3

0.01.90.9

0.60.1

0.20.1

0

010

500

1200

20

13

3703

000

11

160

0000

042

30

20

39

353637

293029

303033

313125

283539

383234

28272930

43383634

302829

3434

2925

Estimated depth may be unreliable because the stronger part of the conductor may be deeper or to one side of the flight line, or because of a shallow dip or overburden effects.


PAGE


FLIGHT LINE ANOMALY CATEGORY

18

1818181818

1818181818

1818181818

181818

181818

1818181818

181818

1818

1818

18

CONDUCTOR BIRDAMPLITUDE (PPM) GTP DEPTH HEIGHT INPHASE QUAD. MHOS MTRS MTRS

970

980980980980980

990990990990990

10001000100010001000

101010101010

102010201020

10301030103010301030

104010401040

10501050

10601060

C

ABCDE

ABCDE

ABCDE

ABC

ABC

ABCDE

ABC

AB

AB

0

00000

10002

40000

104

400

20003

322

10

30

0.0

2.75.45.44.3

13.5

35.413.910.13.0

15.6

35.33.9

13.87.66.5

33.37.7

56.4

52.49.0

19.1

57.45.7

16.31.6

33.7

25.625.826.1

23.44.5

42.311.0

16.7

5.523.216.712.120.2

39.522.332.918.99.0

7.87.9

23.715.414.4

34.315.914.2

10.614.025.9

51.610.019.09.5

14.3

7.719.920.3

24.26.0

21.918.6

0.0

0.10.00.10.10.6

1.40.60.20.02.5

11.60.20.50.30.2

1.50.3

11.2

14.60.50.8

2.10.30.90.04.8

7.02.02.0

1.30.4

4.00.5

0

130165

3700

13

111055

070

090

013704

500

127

10

27

4329333333

2929263140

4438353434

343138

413436

3634343539

444341

3733

3742

1070 5.6 11.1 0.3 41



PAGE



18

18181818

18

18

18

1818181818

18

18

181818

18181818

18181818

18181818

181818

AMPLITUDE (PPM) INPHASE QUAD.

CONDUCTOR BIRD GTP DEPTH HEIGHT

MHOS MTRS MTRS

1070

1080108010801080

1090

1110

1120

11301130113011301130

1140

1150

116011601160

1170117011701170

1180118011801180

1190119011901190

120012001200

B

ABCD

A

A

A

ABCDE

A

A

ABC

ABCD

ABCD

ABCD

ABC

1

2110

0

0

2

00103

0

0

000

00011010

1000

030

15.8

36.829.319.63.1

5.3

2.8

14.6

3.17.19.53.5

22.2

1.4

4.7

3.63.71.4

4.97.23.0

12.7

14.27.4

19.02.8

22.08.16.45.1

4.347.010.3

11.7

31.425.116.19.6

8.6

9.0

8.4

15.515.68.3

19.95.9

9.3

21.0

8.713.89.9

14.113.313.39.9

13.811.619.615.0

20.714.219.98.9

4.523.411.6

1.8

2.01.81.60.1

0.3

0.1

2.4

0.00.21.10.07.9

0.0

0.0

0.10.00.0

0.10.30.01.5

1.20.41.20.0

1.40.40.10.3

0.64.30.8

11

0050

12

8

10

06

2004

0

0

300

61105

4960

10904

1709

39

39393943

38

33

45

3532363248

37

33

434237

30313647

42363538

30323245

514639


PAGE



18

181818181818

1818181818

1818181818181818

181818181818

181818181818

18181818181818


1200

121012101210121012101210

12201220122012201220

12301230123012301230123012301230

124012401240124012401240

125012501250125012501250

1260126012601260126012601260

D

ABCDEF

ABCDE

ABCDEFGH

ABCDEF

ABCDEF

ABCDEFG

1

111530

13000

01004001

110200

010042

1340330

14.7

26.023.838.5

158.131.210.0

18.942.05.19.2

10.2

16.627.915.05.8

68.44.9-0.29.5

11.97.44.9

15.96.22.9

2.131.511.27.8

74.426.6

14.746.3

101.97.9

66.357.77.8

15.9

21.521.335.825.311.211.8

14.417.18.8

15.115.6

22.127.520.810.417.231.54.76.2

12.04.5

22.39.4

11.59.8

10.227.212.338.818.116.0

11.321.126.629.424.220.311.5

1.0

1.81.61.8

27.15.90.8

1.85.40.30.40.5

0.81.50.70.3

11.80.00.01.7

1.01.70.02.40.30.0

0.01.80.90.0

12.72.8

1.64.8

12.60.17.27.20.5

12

5830

118

80

1045

745

14000

19

6260892

02

12000

6000128

32

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4337373636


Ministry ofNorthern Development" 1 Mines

Ontario

Report of Work CI(Geophysical, Geological, Geochemical and Expenditures'

r 2.9623 PETAWANGA LAKE 300Type ot ;?'jrveyisj Township or Area

...-.He l J cop ter, Magnetic , ^ e l ectromagne tic, VLF-EMClaim Ho'rier' s)

Go l d F i e l d s ..C a nad i an, .MArri jig... Ltd......_______

A t .two o cLJ.A k e^/fo^f.jProspector's Licence No.

i T-1195

—l23^Front St. W. 909, Toronto, .Ontario... ... ...M.5J .2M2Survey Company Tbate o* Survey (from Si to)"

—J\erodat Ltd. | bay PSo. ; "r" j oly jName ana A.-.-^'yss of A^'hof ôf Geo-Tecnmcai report)

George Podolskv c/o 3883 Nashua Dr. Mlssissauga. Ontario

'Total Miles of line Cut

Credits Reuiiesteci pe r E:icn Claim .n Columns at rightSpecial P-oviS'Ons

For firs* survey

E".te' JO ciays ''T- - inciorjcs line cult r-::

For eacn additional survey using :ne same gnu:

Enter 20 days (fo r eacn)

oCODhystcal

' Electromagnetic

- Magnetometer

Other

Geo'cg:cal

Geochemical

Man

Co m p etc -over',!.' SKT-

and -inter tntjllsi b':'-

Guonnysicai

Electromagnetic

MaqnetometCf

' Radiometric

O T nor

C) t1 o: on u: a l

Geochomtcnl

Days per C! 11 m

Note: Special orovn ens creoils do not JPPi to Airborne Su".^

E locfomagnetic

Magnetometer

Rao iometr ic

Days per Claim

40

40—

Expenditures (excludes sower stripping)Type or 'AorK êrformec

Pertormec on Catmt

Calculation or E x o e no ;'

Totai E .xoenn ituf osTotai

Days Credits

i nstruct ionsTotal D.ws Creatts r-.iv ô .inpor'ionec) at the datm holder's choice. Enter numnc" o* J.iv s r- o^ IT;- por claim selected m to 1 - r -i n s tit riqhv

Mining Claims Traversed (List in numerical seauence)Mining Ciaim

Pref.x Numner

See Attached

List ....... ......-- — --- - - --

'

——— -^.--1-

' ' :. ,'^'' ; '- :

j

. ' ' ji

Expend. Days Cr.

- - ————

-*4-l

,.- ~-

— —

-

Mining ClaimPrefix Numoer

s."

4W i k*s ' -*

, i

-

E xpend. Days Cr

———

Total number ot mining . claims covered by this

report o* work.- ^ 5 C.

For Office Use OnlyTotal Days O.: Date Recorded Recoroea

, -".v md 'tiM:\ite knowli'dqe o' the facts sei.'onn m :he Report of W.ork annexed herito, Having performed the work •V' f; r.oinnUM on ,ind the annexed 'epo't s true ' "^

Peter Lougheed - Geologist c/o Gold Fields Canadian Mi n i r\^.y Ltd. 123 Front'st. W. Suite 909 Toronto, Ont.

Dec. 11, 1986

s

IB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB

892341892342892343892344892345892346892347892348892349892350892351892352892353892354892355892356892357892358892359892360892361892362892363892364892365892366

TB 892586 TB 892587 TB 892588 TB 892589

TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB TB

892514892515892516892517892518892519892520892521892522892523892524892525892526892527892528892529892530892531892532892533892534892535

DEC l

Ministry ofNorthern Developmentand Mines

Ontario

This is to certify that

AirborneGeophysicalCertificate

Mining Act

Gold Fields Canadian Mining Ltd

with respect to the following mining claims in the

has met the requirements of Section 78 of the Mining Act,

Area) of _______ Kawitos Lake __________________

Mining Claims (Please list)

TB 963373 to 92 inclusive 963466 to 85 inclusive

1332 18&/12)

z ow

Ontario

Ministry of Natural Resources

GEOPHYSICAL - GEOLOGICAL - GEOCHEMICAL TECHNICAL DATA STATEMENT

File.

TO BE ATTACHED AS AN APPENDIX TO TECHNICAL REPORTFACTS SHOWN HERE NEED NOT BE REPEATED IN REPORT

TECHNICAL REPORT MUST CONTAIN INTERPRETATION, CONCLUSIONS ETC.

Type of Survey (s) Helicopter, Magnetic, Electromagnetic, VLF-EMTownship or AreaClaim HolHer(s) j&fA rt ?f At

Atwood Lake Area, Ontario

Survey Company AERODAT LIMITED

Author of Report George PodolskyAddress of Ai.fhnr c/o 3883 Nashua Dr. MISS., Ont.

Covering Dates of Survey June 15 - 17. 1986——--.——(linecutting to office)

Total Miles of Line Cut -———————————..-^———-.^——..—

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

Geological.

Geochemical.AIRBORNE CREDITS (Special provision credits do not apply to airborne surveys)

Magnetometer^D .Electromagnetic 4,0 (enter days per claim

August 6/86AutHbr of Report or

Res. Geol.. .Qualifications.

Previous Surveys File No. Type Date Claim Holder

MINING CLAIMS TRAVERSED List numerically

See Attached List(prefix) (number)

• ••••••••••••••* A^*AM*b***ll**|l*]^*4V*An"

TOTAL rr AIMS 52

837 (5/79)

GEOPHYSICAL TECHNICAL DATA

GROUND SURVEYS -- If more than one survey, specify data for each type of survey

Number of Stations _________________________Number of Readings —

Station interval ______________________________Line spacing ______

Profile scale—————^—^——..^—-^———.-..-.^———-———-.—.........^^———Contour interval.

•z,C

O

ssW

o

InstrumentAccuracy — Scale constant. Diurnal correction method.Base Station check-in interval (hours). Base Station location and value ———

InstrumentCoil configuration

Coil separation —

AccuracyMethod: Q Fixed transmitter d Shoot back d In line d Parallel line

Frequency————————————————————————————————————(specify V.L.F. station)

Parameters measured———^^^———————^————-——-——————

Instrument.Scale constant.

Corrections made.

iBase station value and location .

Elevation accuracy.

Instrument ____

INDUCED POLARIZATION

Method LJ Time DomainParameters — On time

Jx Off tim*"H j? — Delay timet— 4 r ,55 — Infprfitinn timei— iCO .,u3 PowerS*

Electrode array — ———————————————————

Electrode spacing . ————————————————————

Tvne of electrode . —— .. ——

1 _ | frequency uomam FrequencyRange

SELF POTENTIAL

Instrument________________________________________ Range.Survey Method .^——————————^^-——.—-.—.—-—————^^^——.—-—^——

Corrections made.

RADIOMETRIC

Instrument.

Values measured,

Energy windows (levels)——————————————--—.^—.^———.—-————.——.—— Height of instrument____________________________Background Count.

Size of detector————^^^——————^—-—-—.—.—-^—^—————.—.——..—.—.——

Overburden ————^^^^^—-————^^^————^—^—---—.—^^^^—...—-—,———(type, depth — include outcrop map)

OTHERS (SEISMIC, DRILL WELL LOGGING ETC.)

Type of survey——————-^^^^-^^——————^—— Instrument -—^^^-—^-^^——^—————————————Accuracy~.^-^^^^^^^^——————————————Parameters measured.

Additional information (for understanding results).

AIRBORNE SURVEYSType of ginwy^) Helicopter /Electromagnetic/Magnetic; /VT.F-KMInstrument(s) Aerodat 3-frequency/Scintrex Cesium/fterz

(specify for each type of survey)Accuracy ______ l ppm/0.02 nT/1%

(specify for each type of survey)Aircraft n^H Aerospatiale A-Star 350B ————Sensor altituHr 30 metres/45 metres/ 45Navigation and flight path recovery ™PthnH Mini-Ranger MRS3 Positioning -

Aircraft aitituHp 60 metres mean terrain clearance i.inp Sparing inn Miles flown over total area ______ 384 miles _________ Over claims only

GEOCHEMICAL SURVEY - PROCEDURE RECORD

Numbers of claims from which samples taken.

Total Number of Samples. Type of Sample.

(Nature of Material)

Average Sample Weight———————. Method of Collection————————

Soil Horizon Sampled. Horizon Development. Sample Depth————— Terrain^^^—————

ANALYTICAL METHODSValues expressed in: per cent

p.p. m. p. p. b.

D D D

Cu, Pb,

Others_

Zn, Ni, Co, Ag, Mo, As.-(circle)

Field Analysis

Drainage Development____________ Estimated Range of Overburden Thickness.

Extraction Method. Analytical Method- Reagents Used ——

Field Laboratory AnalysisNo. ———-.^——.

SAMPLE PREPARATION(Includes drying, screening, crushing, ashing)

Mesh size of fraction used for analysis .^—^—

Extraction Method. Analytical Method - Reagents Used——

Commercial Laboratory (- Name of Laboratory—- Extraction MpthnH

Analytical Method —— Reagents Used ————

.tests)

.tests)

.tests)

General. General.

TB 892341 TB 892586TB 892342 TB 892587TB 892343 TB 892588TB 892344 ' TB 892589TB 892345TB 892346TB 892347TB 892348TB 892349TB 892350TB 892351TB 892352TB 892353TB 892354TB 892355TB 892356TB 892357TB 892358TB 892359TB 892360TB 892361TB 892362TB 892363TB 892364TB 892365TB 892366

TB 892514 TB 892515 TB 892516 TB 892517 TB 892518 TB 892519 TB 892520 TB 892521 TB 892522 TB 892523 TB 892524 TB 892525 TB 892526 TB 892527 TB 892528 TB 892529 TB 892530 TB 892531 TB 892532 TB 892533 TB 892534 TB 892535

REFERENCES

FROND LAKE G-252

Petawang

LEGEND

r R R (VOS " *

T f* A'i ':

•q'.-f .f" ,. ." '" - ''

if-. BA'jE LINES, cLO""*:- WIN'NCi"' AIMS PA

^-'^ " t. \\:AL S T! .'- AM

;)!\uOR FLL.I- '*G RIGHTS

iwiSfP"; O'* CO" POSIT E PLAN

ORiG(NAi SHORELINE

VtARSH G" MU

MINES

TRAVERSE

DISPOSITION OF CROWN LANDS

TYPE OF DOCUMENT

PATEN' St; P [ ACE Si M: 1 '-G RIGHTS.

, SUHt- ACE Rf

. MIMNG --

LEASE. SUP ; ACE St M '. NG - GHTS

' .SURFACE RIGH ON

' , WINING RK-HTh NLY

LICENCE OF )CCUPATI()N

ORDt. " IN COUNCIL

CANCELLii:

SAND St GRAVf

j OARCt. S Od f G i N A i. PATENTfct e* THE

.iiP 38O. SEC 63 SU8SEC 1

SCALE, l i-.CH - 4 CHAINS

Auger Lake

PETAWANGA LAK

M N.R ADM1MSTRATIVF DISTRICT

GERALDTONMINING DIVISION

THUNDER BAYLAND TITLES/ REGISTRY DIVISION

THUNDER BAY

N 3 1 U TSJ

ResourcesM a ri rig e H-. e n t

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Transcript of HELICOPTER-BORNE MAG VLF & EM ATWOOD L AREA PROJ