l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

l

RECF'VED

Art 9.2 1981

MINING LANDS SECTION

REPORT ONAIRBORNE GEOPHYSICAL SURVEY CLAIMS L-318451 to L-318454 MIDLOTHIAN TOWNSHIP MATACHEWAN, ONTARIO

41P14SE8001 2 ,3844 M IDLOTHIAN 010

On Behalf Of

United Asbestos Inc. P.O. Box 99 , Matachewan, Ontario POK lMO

By

Scintrex Limited 222 Snidercroft Road Concord, Ontario L4K 1B5

I. Johnson IJ/ccApril, 1981 T-2089

l l l l l l l l l l l l l l l l l l l

REPORT ONAIRBORNE GEOPHYSICAL SURVEY

CLAIMS L-318451 to L-318454 INCLUSIVEMIDLOTHIAN TOWNSHIP, ONTARIO

On Behalf Of UNITED ASBESTOS INC.

1. INTRODUCTION

A helicopter-borne geophysical survey was carried out by Scintrex Limited on behalf

of United Asbestos Inc. in the Matachewan area of Ontario. The field portion of the

work was done on February 3, 1981.

The survey covered an area in and around claims numbered L318451 to L-318454 inclu

sive, all in Midlothian Township. Total coverage, including one magnetic tie line

was 14.8 line miles. Principal geophysical sensors were an electromagnetic system

Scintrex (HEM-802) measuring in-phase and quadrature secondary field components at

735 and 3220 Hz and a proton precession magnetometer (Scintrex MAP-4).

Results were compiled in Toronto with contoured magnetics and drafted EM anomaly

centers at a scale of l" - 800 feet being the principal presentation styles.

This report describes the survey procedures, instrumentation and production, in

field compilation and final compilation. Maps showing the results of the work are

included at the end of this report.

This report was prepared by Scintrex Limited, Concord, Ontario, Canada.

49 o

48- P^eyjs

LOCATION MAP

UNITED ASBESTOS INC.MIDLOTHIAN TOWNSHIP AREA

ONTARIO

AIRBORNE GEOPHYSICAL SURVEY

SCALE

JT20

KM l

: 2,000,00050 100

KM

81 - T 2089 FIGURE l

l l l

l

M

l

l l l

2. SURVEY AREA

The survey area is located immediately south and west of the United Asbestos mine

site on Lloyd Lake, approximately 20 miles west of Matachewan (see Figure 1). Thel

operations base for the survey was near the mine site.

l

3. SURVEY EQUIPMENT

The survey equipment consisted of the following:

a) A Scintrex HEM-802 electromagnetic system measuring in-phase and quadrature

l (out-of-phase) secondary field components at frequencies of 735 and 3220 Hz.

(See Appendix l for details). The analog output of the EM system was pre-

| filtered with a low pass filter. The rise time on said filter (rise time ~ the

M time required for an impulse response to go from 10% to 90% of the impulse

value) was 0.50 seconds. The digital recording rate of all HEM data was 0.5

H seconds.

b) A Scintrex MAP-4 proton precession magnetometer with the sensor mounted in the

HEM bird (see Appendix 2 for details).

c) A Scintrex RCM-8 eight channel analog recorder (hot pen type)

d) A Sonotek SUS-1200 digital data acquisition system.

e) A Bonzer MK-10 radar altimeter.

f) A 60 Hz monitor.

g) A Scintrex IITC-2 intervalometer.

h) A Vinten 16 mm camera.

i) Instrument mounting rack, base station magnetometer, test equipment, tools and

spare parts.

l

l

l

l

A. SURVEY SPECIFICATIONS AND SURVEY CREW

l l l

The survey specifications were as follows:

H Line spacing - 400 feet.

j Sensor terrain clearance - 100 to 150 feet.

Aircraft speed - 70 mph.

l The survey crew consisted of:

Geophysicist - lan Johnson/Vince Tanzini

l Operator - Evan Veroni

Dataman - Paul Conroy

Pilot - John Ahlstrom

l Mike Lewis, Operations Manager of Scintrex, maintained overall supervision from the

Scintrex office, Concord (Toronto).

m John Hagan of United Asbestos was on site during the project.

m The helicopter, C-GGUB, a Bell 206B, was owned and operated by Huisson Aviation

Ltd., Timmins, Ontario.

l5. FIELD PROCEDURES AND PRODUCTION SUMMMARY

If all were to proceed without failures or interruptions, the field work would

tti advance according to:

a) Install equipment in helicopter, assemble HEM 'bird 1 , set up base station magne-

H toraeter.

b) Ground test and HEM warm up.

f c ) Fly survey.

M d) Check and edit all analog traces, develop flight path film and plot back the

flight path.

l l l l l l l l l l l l l l l l l l l

The acceptable data was produced on one survey flight (involving a total of 13 lines

flown with north-south orientation and one magnetic tie line). Step a) in the above

sequence was covered under a previous survey contract in approximately the same

area.

The survey flight proceeded as follows:

a) Ground system and magnetometer check.

b) Take off.

c) Airborne systems check and pre-flight analog/digital calibration sequence.

d) Fly lines.

e) Post-flight analog/digital calibration sequence.

f) Land.

All systems performed satisfactorily during the flight. The base station

magnetometer remained "quiet" throughout the survey.

6.

6.1

DATA RECORDING

Analog Records

The analog records display the following:

Channel

1

2

3

4

5

6

7

Content

60 Hz Monitor

735 Hz In-Phase

735 Hz Quadrature

3220 Hz In-Phase

3220 Hz Quadrature

Magnetometer

Magnetometer

Altimeter

Approximate Full Scale Gain

130 ppm

130 ppm

130 ppm

130 ppm

100 gammas

1000 gammas

500 feet

l lB Fiducial (one per second) counters are shown above channel one and below channel 8.

Chart speed is 2 mm per second. Lines and fiducial numbers are manually labelled.

B Where the fiducial trace is seen the system is on line and all recording systems on.

B The analog records for the survey have been fan folded and stored in an envelope.

lAt the start and end of each flight are calibration sequences. The four EM channels

l are calibrated by activating pre-set 100 ppm (parts per million) calibration pulses.

The magnetometer channels are calibrated on analog only as the digital records read

m d irectly in gamma. The same holds true of the radar altimeter record.

The base station magnetometer recorder was run with 100 gammas full scale and at a

fl chart speed of 10 cm per hour.

l

l

Flight logs, maintained by the operator, show all lines surveyed, start and end

fiducial points, initializing information and any non-standard events.

l 6.2 Digital Records

All airborne survey data were recorded on the digital data acquisition system,

l Fiducials and magnetometer readings were updated every one second. All time EM and

p altimeter data were sampled every 0.5 seconds. All EM data was digitally sampled

after electronic filters of rise times 0.5, 1.1 and 2.2 seconds.

lRecording was on 9-track magnetic tape, 800 bpi format.

l

l

l

7. IN-FIELD COMPILATION

l l l

The analog records were studied for quality and consistency. All lines were

B labelled and fiducials marked. The flight path film was developed and edited. The

j flight path was recovered on photomosaics (scale l" = { mile) to ensure area

coverage at agreed line spacings. Prominent electromagnetic anomalies were identi-

I fied and plotted on an overlay ("red ball" map) at the scale of the photomosaics.

8. PRESENTATIONl

8.1 Base Map

l The flight path was plotted on greyflex copies of the photomosaic at the scale of

l" s 800 feet. Claim boundaries and claim numbers were drafted on the same base

l map.

8.2 Electromagnetic Anomaly Selection and Plotting

l The analog records were studied for anomalous responses, all of which were analyzed

and plotted.

ljm All selected anomaly amplitudes were analyzed by computer and the interpreted

conductance and depth to source estimates listed. The results are shown in Appendix

l

B All selected anomalies have been plotted on the flight path map at the scale of l" s

^ 800 feet. Appearing with the anomaly center are the anomaly label, conductance

estimate and depth of burial estimate (both for the vertical half plane model).

B The plotting convention for EM anomaly centres is as follows:

l

l l l l l l l l l l l l l l l l l l l

D ELECTROMAGNETIC ANOMALIES _______________________ Q

3.1 W52 D-Anomoly lobel 3.1-Conductance (in mhos) 52-Depth to source (feet)

CATEGORY 3 (735Hz In-phase amplitude > 10 ppm)_________ 9

CATEGORY 2 (Oppm < 735 Hz In-phose amplitude s 1 0 ppm)____ O

CATEGORY l (Oppm : 735 Hz In- phase amplitude)_________ O

CATEGORY O (either 735 or 3220Hz 'in - phase amplitude < Oppm)__-D

ANOMALOUS ZONE AND PEAK LOCATION________________ t Q i

The category zero anomalies (shown as an open square) indicate negative in-phase

response due to a source of high volume magnetic susceptibility. Such targets,

though often of high conductance, provide unreliable conductance estimates and no

such estimate is therefore shown on the appropriate plate.

Where the conductance and depth to source estimates are shown, averages of both low

(735 Hz) and high (3220 Hz) model parameters are used. If estimates derived from

the low frequency anomaly are unreliable (due to low amplitude), the high frequency

estimates are used. If the calculated depth to source proves negative (indicating a

poor model fit), the depth is shown as zero.

l ll 8.3 Magnetic Contour Map

M All magnetic data was machine contoured at the scale of l" K 800 feet. The minimum

contour interval is 10 gammas. Magnetic data over the actual mine site (north end

M of l ines 11, 12 and 13) was not contoured as a) the contouring algorithm will not

accept data over as few as three lies and b) magnetic gradients in this area were

f extremely high causing the magnetometer to occasionally go "off-lock" with a

resultant loss of data.

l Magnetic contouring was done by Dataplotting Services Limited, Toronto.

l

l

9. CONCLUSIONS

A helicopter-borne electromagnetic and magnetic survey of approximately 14.8 line

B miles has been completed on behalf of United Asbestos Inc. in the Midlothian Town-

11 ship area of Ontario. Results have been plotted at a scale of l" s 800 feet.

Numerous high conductance EM targets are indicated. Comparison with the contoured

l magnetics would guide the assignment of conductor axes and priorities thereof.

l Respectfully submitted,

SCINTREX LIMITED

l lan Johnson, Ph.D., P.Eng.

l

l

l

l

l

l

l

APPENDIX III

ELECTROMAGNETIC ANOMALY LISTINGS

l ll

The following listings are largely self-explanatory. Some explanation,

l however, follows.

l I. 735, IP, PPM, etc.

Anomaly amplitudes in pptn (parts per million) at the selected

frequency (735 or 3220 Hz) for the selected component (IP s in-phase,

B Q s quadrature). Original amplitude assignments were in small divi

sions of analog. These values were converted to ppm using the average

l conversion factors of 3 ppm/small division for the 735 IP, 735 Q, 3220

IP and 3220 Q channels.

II. ALT.

lHelicopter terrain clearance at the peak location. Bird terrain

l clearance is arrived at by assuming a 110 foot cable.

l

l

III. ST., DEP.

Sigma t (conductivity-thickness product or conductance) in mhos of the

vertical half plane model (VHP) and depth to top of VHP model (appears

l as negative where model is above ground surface, i.e. bad fit).

IV. AVERAGE, ST., DEP.

Average conductance (ST) and depths (DEP) from low and high frequency

l ll l l l l l l l l l l l l l l l l

COND. RANGE

Conductance range figure based on average conductance estimate (see

Item IV above). Conductance range figures vary from one to nine

(higher numbers for higher apparent conductance values). Conductance

range figure delimiters are as follows:

CONDUCTANCE RANGE FIGURES

1234 . .567 -e9 .

0 i2.0 '

- - 3.0 -5.0 -B.O -

12.0 -17.0 '30.0 "76.0 *

i 0"t *t a t *1 o t' Ot' Ot' Ot' O t' 0 1' O t

f 2.0 mhoi

B.O mhoi

I7.0 mhot30.0 mho*75.0 mhoin mhoi

VI. CAT.

Category based on 735 Hz in-phase amplitude with delimiters as

follows;

D. ELECTROMAGNETIC ANOMALIES__.__..—._________-___ ——Q

D-Anomoly lobel 3.I - Conductonce (in mhos) 52-Depth to source (feel)

CATEGORY 3 (735Hz In- phase amplitude > lOppm)__________ 9

CATEGORY 2 (Oppm < 735 Hz In-phose amplitude S 10 ppm)____ O

CATEGORY l (Oppm: 735 Hz In-phase amplitude)__________ O

CATEGORY O (either 735 or 3220Hz In - phase amplitude < Oppm)__-D

ANOMALOUS ZONE AND PEAK LOCATION____-._.__.-,____ p--Q—i

UNITED ASBESTOS - MATACHEWAN AREA

LI '.\L in'. FRQH PEAK TOF'OS l FID': LOC: FID:

'l l lii i li 11 ),ii l fJ

17 4 i 7 Ai p?

i f!2 1S8 i 5?

2 7 3

2 ? 3

383

o63-' P P

7217 9 47 2 9 v "i A

758 ••t ^ -j7 V J

H 9 9

8 3 9B 7 55 R S

735Tp"

PPHrv

38

T

35

(l

A

n

3

TI6ir

-2-4-9

--'7-41 3"o

0o

~9-23

7 "^ Sri"

PPHt cr

811

8CJ

3

3

3

3

8

03

i R342926

9 Q

26'M~0

oT;

3939

3220TP

P P H

10~7

24

1077

3

3

3

14

33

4273S 9

45

T--V

4949'i

T

7

7649

32200

PPHi c:;2124

1 R2115

18

9

9

15

912377 "t7061

61524612

6217 "t98

- ™ -, *. W. ——— 1 1 l j D . —— W .. . - *. ——— M--. ™ -. ™ ~ ̂ — .. .~, , ,, J.^- -

ALT:( F T )-?9n290260

2703003lO

240

290

270

370

20A2602809 i A260250

2402?o?70300

2909sn290230

(735 H2)ST, DEP,

6,4 511O i") i t 0 ^

5,0 34

1=8 IS2:4 39

nn* * ***

f *t*f *m

mtt **n

*nn tt**

1,8 -82

mr* *n*^fjlf.*)); irjrfif.

- 2il -33^i* 1̂ ^ i i**if ̂ if^y -if * if f***** ****

ft^n m*it )j( )jr* ty ^'t^'

4i2 -28mn t***

^^^^* ft^4. jj; )i! ir ̂ )j( t if If^•i^*^ 4' 1f'!''!;^^^^ ^ -jf^jf

(3220 HZ)ST ,

1,10 s 62. -6

1,00,60,7

0,3

0,5

0,5

1,9

0,50,43,43:42,32,2

1,42,33,10:4

0,60,33,71,3

DEP ,-43-44

4

-6-54-43

-4

0

20

-89

90•l-36-46-A7-35

-26-52-34-39

49-36-7 A-38

AVERAGEST;

3,81,23,8

1,41,50,7

0,3

0,5

0,5

1,8

0,5f) , A2,73,42,32,2

1,42,33,60,4

ri , AO', 33 , 71 , 3

DEP :

4-99

19

6-7

-43

...4

A

20

--85

901

-34-AA-47-35

-26- ? 2'-30-39

49-i A~ 7 A-35

COND ,RANGE

313

111

i

1

i

i

i12iil

tH'3i

1ii^

C A

222

2•jT

1

i

i

2

ii9

5oo

003ii'i50

Lloyd Lake

47*93'47 0 53'

Lloyd Lake

47"*92'

LEGENDFLIGHT LINE, NUMBER AND DIRECTION

CONTROLLED POINT. .

UNCONTROLLED POINT .. .

MEAN FLIGHT LINE SPACING-... . .

MEAN SENSOR TERRAIN CLEARANCE

^ 200 2498

- x 2875 4OO F EET

125 FEET D

ELECTROMAGNETIC ANOMALIES __^____..._______... -__ Q——

D-Anomaly label 3.1 - Conductance (in mhos) 52-Depth lo source (feet)

CATEGORY 3 (735Hz In-phase amplitude * 10 ppm)__________ 0

CATEGORY 2 (Oppm ^ 735 Hz fn-phase amplitude s 10 ppm)____ O

CATEGORY l (Oppm: 735 Hz In-phase amplitude)_____^____ O

CATEGORY O (either 735 or 3220Hr In - phase amplitude < Oppm)__-- D

ANOMALOUS ZONE AND PEAK LOCATION_____..____^__i——Q—i

41PI4SEW0) 2.3644 M IDLOTHIAN 200

PLATE IE UNITED ASBESTOS INC.

MATACHEWAN AREA, O NTARIOCLAIMS NUMBERED L -297019, L -318448, L - 3'84 51, L- 318452, L-318453, l 318454

AIRBORNE GEOPHYSICAL SURVEYSCINTREX H EM-802 E LECTROMAGNETIC SYSTEM

SCINTREX MAP-4 MAGNETOMETER

SCALE : 800 feet to l Inch800 BOO 1600 2400

FEFT FEET

Fiown and Compiled by

SCINTREX LIMITED1981

81

Lloyd Lake

47 C 33'

MTL VJl <t

47 0 52

47 0 53

Lloyd Lake

LEGEND

FLIGHT LINE, NUMBER AND DIRECTION

CONTROLLED POINT

UNCONTROLLED POINT

MEAN FLIGHT LINE SPACING

MEAN SENSOR TERRAIN CLEARANCE

MINIMUM CONTOUR INTERVAL

41P14SE080I 2.3844 MIDLOTHIAN 210

~ ^ 200 E49B

* 2875

400 FEET

I25 CEE1

20 GAMMAS

PLATE I M

UNITED ASBESTOS INC.MATACHEWAN A REA, O NTARIO

CLAIMS NUMEUHEO l 31 8448 , L

AIRBORNE GEOPHYSICAL SURVEYSCINTREX H EM- 802 ELECTROMAGNETIC SYSTEM

SCINTREX MAP - 4 M AGNETOMETER

SCALE : 800 feet to l inchsou I600

f LE r

Flown one Compiled by

SCINTREX LIMITEDI98I

l r

61 - T 20B9