RPT ON TRANSIENT EM BOREHOLE SUR - LUMBY L PROP · 1 1 ' 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 * SAGAX...

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1 I I I I I I I I I I I I I I I I I I SAGAX GEOPHYSIQUE 52G83SW0ee9.2.12397 NORWAY LAKE 010 PREMIER LAKE RESOURCES SAPAWE, ONTARIO TRANSIENT ELECTROMAGNETIC BOREHOLE SURVEY LUMBY LAKE PROPERTY REGION OF ATIKOKAN OCTOBER 1988 RECEIVED APR 24 1989 MINING LANDS SECTION SAGAX 88310 SAGAX Geophysique inc. 6700 Avenue du Pare, suite 110, Montreal, Quebec, Canada H2V 4H9 Fax: (514) 271-4679 Telex: 05-BS6577 Telephone: (514) 271-3150

Transcript of RPT ON TRANSIENT EM BOREHOLE SUR - LUMBY L PROP · 1 1 ' 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 * SAGAX...

Page 1: RPT ON TRANSIENT EM BOREHOLE SUR - LUMBY L PROP · 1 1 ' 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 * SAGAX GEOPHYSIQUE 3. SURVEY WORK UNDERTAKEN 3.1 Generalities Out of the seven (7) diamond

1 I I I I I I I I I I I I I I I I I I

SAGAXGEOPHYSIQUE

52G83SW0ee9.2.12397 NORWAY LAKE 010

PREMIER LAKE RESOURCES

SAPAWE, ONTARIO

TRANSIENT ELECTROMAGNETIC BOREHOLE SURVEY

LUMBY LAKE PROPERTY

REGION OF ATIKOKAN

OCTOBER 1988

RECEIVED

APR 24 1989

MINING LANDS SECTION

SAGAX 88310

SAGAX Geophysique inc.

6700 Avenue du Pare, suite 110, Montreal, Quebec, Canada H2V 4H9 Fax: (514) 271-4679 Telex: 05-BS6577 Telephone: (514) 271-3150

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I B^BH III ••IIBIII I IBIIIBIBI •! IIBHIIIfll ••••••IBBIBII I IBM • Bll ^£ j. _oj j. m —

^^ 52Ge3SWee«9 2.12397 NORWAY LAKE 010C i SAG AX^""^ 6EOPHYSIQUE

TABLE OF CONTENTS

Page

1. INTRODUCTION ............................................................................... 4

2. GENERAL SURVEY DETAILS

2.1 Localization and access

I 2.2 Survey personnel

3. SURVEY WORK UNDERTAKEN ...............................

3.1 Generalities

3.2 The downhole time-transient EM method (TEM)

3.3 Equipment and survey procedure

3.4 Difficulties encountered

3.5 Presentation of survey results

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5. SUMMARY AND CONCLUSION .................................................. 15

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4. INTERPRETATION AND RECOMMENDATIONS ..................... 10

4.1 Drillhole PL 88-1

4.2 Drillhole PL 88-2

4.3 Drillhole PL 88-3

4.4 Drillhole PL 88-4

4.5 Drillhole PL 88-5

4.6 Drillhole PL 88-6

4.7 Drillhole PL 88-7

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APPENDIX

PL 88-3 Bl

PL 88-4 B1-B2-B3

PL 88-5 Bl

PL 88-7 Bl

I| w ______

GEOPHYSIQUE

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• A) Crone PEM profiles (7)

• PL 88-1 Bl

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1. INTRODUCTION

At the request of Geocom Consulting Inc., SAGAX Geophysics Inc. carried out a down-hole transient electromagnetic survey on the Lumby Lake property near Sapawe, Ontario. The purpose of the survey was to detect the presence of massive sulfides and to ascertain the direction and extension of these sulfides in order to trace the gold which is thougth to be associated with them.

Within this report, the survey technique is exposed, the geophysical results are discussed and pertinent recommendations are formulated in order to better advance exploration work over the property.

2. GENERAL SURVEY DETAILS

2.1 Localization and access

The Lumby Lake property is situated approximately thirty five (35) kilometres north of Sapawe near the Atikokan region of Ontario (figure 1). It is located north of the Ramsey Wright Township (NTS 52 G) and is accessible from Thunder Bay by highway 11 West and a secondary road (623) leading to Sapawe and to Lumby lake.

2.2 Survey personnel

The SAGAX field crew consisted of Mr. Alain Zubrzycki, geophysicist and crew chief, Mr. Hugues Potvin, field geophysicist and one field technician. Mr. Eddy Canova, project geologist for Geocom Consulting Inc. was informed on a daily basis as to the progress of the survey team in order to ensure the smoothest and most efficient undertaking of the geophysical campaign.

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Figure 1: Location of Lumby Lake property

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3. SURVEY WORK UNDERTAKEN

3.1 Generalities

Out of the seven (7) diamond drillholes which were meant to be logged with the borehole Pulse EM method, two (2) were blocked at surface (PL 88-2, 6). Therefore a total of five (5) diamond drillholes were logged by the SAGAX field crew.

The field work, totalling six (6) days excluding mobilization and demobilization, was executed between the 11 th and the 19th of October 1988. The field crew undertook the deployment of the surface loops, as directed by Mr. Zubrzycki. Readings were taken at 10- and 5 -metre intervals along the holes.

List of surveyed holes:

DDH # Length surveyed # of loops Total surveyed (ft) (ft)

PL 88-1 312 1 312

PL 88-3 492 1 492

PL 88-4 597 3 1 791

PL 88-5 529 1 529

PL 88-7 459 1 459

5 DDH 2 389 7 3 583

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3.2 The down-hole time-transient EM method (TEM)

The borehole electromagnetic technique encompasses a small family of EM methods in the time domain, which are most often identified by the manufacturer's name. The Crone Pulse EM is the most commonly known. The primary signal transmitted consists of a pulsed current in a large rectangular loop of wire which is layed out at surface. The secondary electromagnetic field is measured, using a long cylindrical coil, in the absence of the primary field, during the "off time", much like induced polarization but at higher frequencies. Using a cable and winch, the receiver coil probes the diamond drillhole measuring the axial component of the secondary magnetic field.

Practically speaking, the measurement consists of sampling the secondary field over eight (8) time slices, from t x to t8 , and stacking successive samples until a stable measurement is achieved. The receiver is synchronized to the transmitter via a cable, a radio antenna or a quartz crystal clock. The operator fixes the zero time at the receiver since the shape of the signal varies from site to site, depending on the Tx loop perimeter and the conductivity of the overburden.

As in all electromagnetic methods, TEM detects the presence of a conductor which permits the circulation of eddy currents (figure 2). This condition is essential if we are to measure the induced secondary magnetic field. We must therefore be in the presence of a conductor having a sufficient size which is also electrically continuous. A very good conductor is characterized by a response which is equal in amplitude over all channels, whereas a poor conductor produces a secondary field which decays quite rapidly over time, hence a response in the first channels only. Figure 3 shows various borehole TEM responses known as "in-hole", "edge" and "off-hole" anomalies.

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TRANSMITTER LOOP

EDDY CURRENTS

PRIMARY FIELD

Figure 2: Schematic showing the borehole TEM measurement in the presence of a conductor.

HOLE INTERSECTING CONDUCTOR - MOLE OUTSIDE CONDUCTOR

Figure 3: Borehole PEM/TEM type response curves.

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3.3 Equipment and survey procedure

The equipment used in this survey was the 400W downhole Crone Pulse EM system. The receiver used was a Crone analogger. The probe used measured dBz/dt (serial #39, head #22). The survey consisted in laying a square transmitter loop of 330 feet on the surface (see figure 2), and lowering the probe into the hole to take measurements.

3.4 Difficulties encountered

The quality of measurements of dBz/dt was closely monitored during the course of the survey and no technical weaknesses affected the reliability of these readings.

Two (2) diamond drillholes (PL 88-2,6) were blocked within ten (10) feet of the collar. These blockages were probably due to a bad cementation of the collar to the bedrock. Apart from these blockages the acquisition of the data and the survey went smoothly.

3.5 Presentation of survey results

The results are presented in the form of stacked multi-channel profiles along an abscissa which represents the hole axis, thereby providing a distinct profile for each of the eight channels. The axial scale is 1:600. The ordinate axis is a plot of amplitude of the secondary field measured parallel to the axis of the hole. The ordinate scale is linear in the 0 to 10 range (10 units over 1.5 cm), and logarithmic in the 10 to 1 000 range (1 decade per 3.5 cm).

Profiles for each of the loops are presented here, such that, for the five (5) holes, seven (7) sets of profiles are shown. The profiles are easily identified by a header, which includes the name of the drillhole, the loop used, its position relative to the collar, technical specifications, the date, etc.

A plan view map, presented at the 1:2500 scale, is also included. It shows the projection at the surface of the geophysically logged drillholes, as well as an indication of their surveyed extent. The map also shows the surface loops as they had been spread out on the field.

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4. INTERPRETATION AND RECOMMENDATIONS

As no important conductor was detected in this Pulse EM survey, the discussion which follows will rather be descriptive and will relate to field observations. As previously mentionned, out of the seven (7) holes SAGAX Geophysics Inc. was mandated to survey, two (2) were blocked at surface. Each of the remaining five (5) holes were logged with a maximum coupling loop (figure 4). Only hole PL 88-4 resulted in anomalous PEM readings; for this reason two more loops were used to log that hole (figure 5 and 6).

4.1 Drillhole PL 88-1

The hole PL 88-1 has its collar located at coordinates 12+25E, 1+25S. It was drilled due south. The drill collar has a -45 degree dip. The hole has been surveyed between 65 feet and 377 feet along its axis. A very-flat profile is observed which indicates that in any direction away from the hole, there are no EM conductors present within 300 feet of the axis of the hole.

4.2 Drillhole PL 88-2

The hole PL 88-2 has its collar located at coordinates 18+OOE, 4+12S, It was drilled due south. The drill collar has a -45 degree dip. The hole was blocked on surface.

4.3 Drillhole PL 88-3

The hole PL 88-3 has its collar located at coordinates 10+OOE, 1+25S. It was drilled due south. The drill collar has a -45 degree dip. The hole has been surveyed between 65 feet and 557 feet along its axis. A very flat profile is observed which indicates that in any direction away from the hole, there are no EM conductors present within 300 feet of the axis of the hole.

4.4 Drillhole PL 88-4

The hole PL 88-4 has its collar located at coordinates 7+OOE, 0+80S. It was drilled due south. The drill collar has a -45 degree dip. The hole has been surveyed between 65 feet and 662 feet along its axis. Three loops were used to log this hole.

The type of PEM curve obtained is an "in-hole" edge-type curve. Its large amplitude as well as the fact that each channel is responding well indicates that the causative body is a good conductor. Despite the use of multiple loops and multiple couplings the response due to the body does not vary. This leads us to believe that the body was intersected in its center and that it is spherical in shape. Its radius is probably ten (10) feet. However care must be taken in assessing a shape and dimension to this body since at least 5% of pyrrhotite has been detected in the hole and even a small quantity of pyrrhotite could cause this type of anomaly.

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330* N

•B-lv- (MAXIMUM COUPLING)/ / '/ '/. 7.'""'/'.'I'M.

////

\ IkFigure 4: TYou PL 88-3. boucle 1.

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SAGAXGEOPHYSIQUE

330' N

\\\\\\\\\\X

(MAXIMUM COUPLING) / ^

U-U-WTO M/////

///

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Figure 5: Trou PL 88-4, boucles 1 et 2.

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400*

\\\\\\\\\\\\\ \\\

B-3^ ^ \ \"\

(MINIMUM COUPLING)

i i i i i i i

Figure 6: Trou PL 88-4, boucle 3,

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4.5 Drillhole PL 88-5

The hole PL 88-5 has its collar located at coordinates 3+50E, 1+OOS. It was drilled due south. The drill collar has a -50 degree dip- The hole has been surveyed between 65 feet and 594 feet along its axis. A very flat profile is observed which indicates that in any direction away from the hole, there are no EM conductors present within 300 feet of the axis of the hole.

4.6 Drillhole PL 88-6

The hole PL 88-6 has its collar located at coordinated 0+52E, 1+OOS. It was drilled due south. The drill collar has a -41 degree dip. The hole was blocked on surface.

4.7 Drillhole PL 88-7

The hole PL 88-7 has its collar located at coordinates 16+OOE, 1+50S. It was drilled due south. The drill collar has a -45 degree dip. The hole has been surveyed between 65 feet and 524 feet along its axis. A very flat profile is observed which indicates that in any direction away from the hole, there are no EM conductors present within 300 feet of the axis of the hole.

Although the Pulse EM survey responded to the intersected sulfides in the holes, it determined that there are no massive sulfides in periphery of the holes (600 feet in diameter along the axis of the hole). In general the survey has failed at identifying the direction of the richest zone of mineralization. For this reason we suggest that if other borehole geophysics is to be done on the property, borehole IP or variants of borehole IP should be used (such as directional survey, mise-a-la-masse etc.). Borehole IP is sensitive to both massive and disseminated sulfides and should give valuable information as to the direction and the emplacement of the richest zone of mineralization on the Lumby Lake property.

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5. SUMMARY AND CONCLUSION

At the request of Geocom Consulting Inc., SAGAX Geophysics Inc. carried out a Pulse EM survey of five (5) drillholes on the Lumby Lake property. Allthough the technique responded to the intersected sulfides, no massive sulfides were detected in periphery of the surveyed holes. In the event that additional borehole geophysics is considered, it is recommended to carry out a borehole IP survey to investigate for non-conductive, massive to disseminated sulfides.

Respectfully submitted,

SAGAX Geophysics Inc.

r Alain Zubrzycki, D.Sc.A. Geophysicist

October 1988

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APPENDIX A

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100 _

10 _

CRONE

UNITS

Bz/dl lo(f)

-10 _

BOREHOLE PULSE-EM HOLE PL-881

-1000J Feel

_ o

_ -10

_ -100

L -looo

LOOP #1

-N-

PL-881O

collar: 12+25E . 1+25S

PREMIER LAKE RESOURCES

LUMBY LAKE PROPERTY

ATIKOKAN REGION, ONT.

Channels 1-8

i ime base '• 1 Ons

ZTS : 249ms

Tx 1oop * 1 :

r amp t !me 1.Oms

gain : 500

100 X 100 metre

I ns t r umeni a i i on '•

Dale :

Surveyed by :

Interpreted by ^

Hor izont al seale

CRONE PEM

October 1988

H. POTVIN

A. ZUBRZYCK1

1 In : 50 feet

SAGAX GEOPHYSICS INC

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E PULSE-EM HOLE PL-883_ 1000

_ 100

Feel

_ 10

_ 0

l_ -10

_ -1000

LOOP #1

PL-883O

collar: 10+OOE . 1+25S

PREMIER LAKE RESOURCES

LUMBY LAKE PROPERTY

ATIKOKAN REGION, ONT.

Channels 1-8

1 irae b ase • 1Oms

ZTS : 2 49ns

Tx 1 oop * 1 '•

r amp t iroe 1.Oms

gain : 500

100 X 100 netre

Ins tr umenlat ion :

Dale :

Surveyed by :

I n ier pr e t ed by

Hor izoni al scale

CRONE PEM

October 1988

H. POTVIN

A. ZUBRZYCKI

1 In : 50 feel

SAGAX GEOPHYSICS INC

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1000_,

10 _

CRONE UNITS

d8z/dl loll 1

-10 _

-I00_

-tooaJ

BOREHOLE PULSE-EM HOLE PL-883,_ 1000

_ 100

_ 10

_ 0

_ -10

„ -100

Feet l_ -1000

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REHOLE PULSE-EM HOLE PL-884._ 1000

_ 100

_ 10

Feet

_ -10

_ -100

LOOP *1

11_

PL-884O

collar: 7 + OOE . 0 + 80S

PREMIER LAKE RESOURCES

LUMBY LAKE PROPERTYATIKOKAN REGION, ONT.

ChanneIs 1-8

i Irae base • 10ms

Z7S : 249ms

Tx 1 oop * 1 •

r amp l ime : 1.Oms

gain : 500

100 X 100 metre

I ns ir umeni a t ion '•

Date :

Surveyed by '•

Interpreted by 1

Hor I zon t a 1 scale

GRONE PEM

October 1988

H. POTVIN

A. ZUBRZYCKI

1 In : 50 feet

SAGAX GEOPHYSICS INC

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CRONE UNITS

dBz/cH (off)

BOREHOLE PULSE-EM HOLE PL-884

Feet

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iHOLE PULSE-EM HOLE PL-884,_ 1000

_ 100

feet

_ 10

_ 0

_ -10

_ -100

L_ -looo

LOOP *2

-n-

PL-884O

collar: 7+OOE . 0 + 80S

PREMIER LAKE RESOURCES

LUMBY LAKE PROPERTYATIKOKAN REGION. ONT.

Channels 1-8

1 ime base : 10ms

ZTS : 249ms

Tx loop »Z :

r amp t!me • 1.Oms

gain : 500

100 X 100 melre

1nsir umenlai ion !

Date :

Sur veycd by '•

Inl erpr eled by :

Hor i zoni al scale

CRONE PEM

Ociober 1988

H. POTVIN

A. ZUBRZYCK1

1 In : 50 feel

SAGAX GEOPHYSICS INC

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1000^

100 _

10 _

CRONE UNITS °

dBz/dtlofn

-10 _

-I00_

-1000_

BOREHOLE PULSE-EM HOLE PL-884

feel

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?EHOLE PULSE-EM HOLE PL-884._ 1000

_ 100

Feet

_ o

_ -10

_ -100

l_ -1000

LOOP #3

-n

PL-884O

collar: 7+OOE . 0 + 80S

PREMIER LAKE RESOURCES

LUMBY LAKE PROPERTYATIKOKAN REGION, ONT.

ChanneIs 1-8

t ime base : 10ms

ZTS : 249ms

Tx 1oop *3 :

ramp t ime • 1.Oms

gain : 500

122 X 100 metre

Ins trumeni alion :

Dale :

Sur veyed by •

1 n i e r pr e i ed by '•

Hor Jzoni al scale

CRONE PEM

Oclober 1988

H. POTVIN

ft. ZU8RZYCK1

1 In : 50 feet

SAGAX GEOPHYSICS INC

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<

100 _

10 _

CRONE

UNITS

(off)

-10 -

-100_

-1000J

BOREHOLE PULSE-EM HOLE PL-884

Feei

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EHOLE PULSE-EM HOLE PL-885

Feel

— - 10

_ -100

LOOP #1

-Fl-

PL-88SO

collar: 3+50E , 1+OOS

PREMIER LAKE RESOURCES

LUMBY LAKE PROPERTYATIKOKAN REGION, ONT.

Channels 1-8

1 ime base : 1Oms

ZTS : 249ms

Tx 1 oop * 1 "•

r amp lime '• 1 . Oms

gain : 500

100 X 100 metre

1 ns i r u men t a t ion '•

Dale :

Surveyed by '•

I nl er pr e 1 ed by '•

Hor izont al scale

CRONE PEM

October 1988

H. POTVIN

ft. ZUBRZYCK1

1 in : 50 feet

SAGAX GEOPHYSICS INC

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1000_

CRONE UNITS

dSz/dl l ain

-1000-

BOREHOLE PULSE-EM HOLE PL-885

Feet

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E PULSE-EM HOLE PL-887,_ 1000

_ 100

Feei

_ 10

_ 0

- -10

_ -100

- -1000

LOOP #1

-N-

Pl-887O

collar: 16+OOE . 1+50S

PREMIER LAKE RESOURCES

LUMBY LAKE PROPERTYATIKOKAN REGION, ONT.

Channels 1-8

i ime base • I Oms

ZTS : 249ms

Tx loop * 1 :

ramp time • 1.Oms

gain : 500

100 X 100 metre

I ns t r umen t at ion '•

Date :

Sur veyed by :

Interpreted by '•

Hor izontal scale

CRONE PEM

October 1988

H. POTVIN

ft. ZUBRZYCKI

1 in : 50 feet

SAGAX GEOPHYSICS INC

A

Page 29: RPT ON TRANSIENT EM BOREHOLE SUR - LUMBY L PROP · 1 1 ' 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 * SAGAX GEOPHYSIQUE 3. SURVEY WORK UNDERTAKEN 3.1 Generalities Out of the seven (7) diamond

1000^

100 _

10 _

CRONE

UNITS

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Page 30: RPT ON TRANSIENT EM BOREHOLE SUR - LUMBY L PROP · 1 1 ' 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 * SAGAX GEOPHYSIQUE 3. SURVEY WORK UNDERTAKEN 3.1 Generalities Out of the seven (7) diamond

\SAGAXGEOPHYSIQUE DWJCHft

FINAL INVOICEINVOICE 2532

Geocom Consulting 4902 St-Charles Suite 202 Pierrefonds QC H4H 3E3

DATE OF INVOICE PROJECT NUMBER TERMS

Professional Fees

Pulse EM Survey

Premier Lake Property

Mobilization/Demobilization

Crew in operation

5.0 days @ 1 550 $ per day

Crew in standby

0.0 day

Final Report:

15% of the survey cost (7 750 $)

RECEIVED

MAY 3 1 1989

MINING LANDS SECTION

TOTAL

LESS INVOICE 2501

TOTAL OF THIS LAST INVOICE

Total footage: 3,583 feet

Overdue accounts are subject to 2% interest per month.

SAGAX Geophysique inc.6700 Avenue du Pare, suite 110, Montreal, Quebec, Canada H2V 4H9 Fax: [514] 271-4679 Telex: 05-826577 Telephone: [514) 271-3150

88/12/31 88310 B NIOdavs

3 000,00 $

7 750,00 $

0 $

1 16?,,50 $

11 912,50 $

10 750,00 $

1 162,50 $

Page 31: RPT ON TRANSIENT EM BOREHOLE SUR - LUMBY L PROP · 1 1 ' 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 * SAGAX GEOPHYSIQUE 3. SURVEY WORK UNDERTAKEN 3.1 Generalities Out of the seven (7) diamond

Ministry ofNonhern Development

mes

Report of Work(Geophysica!, Geological. Geochemical and Expenditun

MininflAct 5aG03SWe>009 2. 12397 NORWAY LAKE 900

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//OCredits Requested per Each Claim in Columns at fightSoec«*l 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 ente* totalls) here

Airborne Credits

Note; Special provisions i credits do not apply• 10 Airborne Surveys.

i

Geophysical

• Electromagnetic

• Magnetometer

• Radiometric

• Other

Geological

Gaochemical

Gaophysic*i

• Electromagnetic

• Magnetometer

- Radiometric

• Other

Geological

Geochemical

Electromagnetic

Magnetometer

Radiometric

Days parClaim

Dayt perClaim

Days par Claim

Expenditures (excludes power stripping)

Mining Claims Traversed (List in numerical sequence)

TVO* of Performed

on C'aim(s)

lculation o* Enpenditure Day* Credits

Tote' E apendilures

|s 7-7.^0 -Q-o

Total Days Credits may ot apportioned at the claim holder's cno-ce E nter number oi days credits per c iaim selected T> columns at r ight.

Total number of mming claims covered by this report of work.

'titicalion Verifying Report o( Worknerepy certify thai 1 have a personal and intimate knowledge of the facts set forth jn the Report of Work annexed hereto, having performed the work 1 witnessed in me during and/or after its completion and the annexed report is true.• and Pot'*' Address of Person Certifying

Page 32: RPT ON TRANSIENT EM BOREHOLE SUR - LUMBY L PROP · 1 1 ' 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 * SAGAX GEOPHYSIQUE 3. SURVEY WORK UNDERTAKEN 3.1 Generalities Out of the seven (7) diamond

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