report on an electromagnetic survey perrigo lake … · 2017. 1. 17. · report on a magnetic...

* SaN08SE8*56 63.2733 MCNAUGHTON 010

REPORT ON AN ELECTROMAGNETIC SURVEY

PERRIGO LAKE AREA - ONTARIO

C. C. Ruston & Associates 2001 - 80 Richmond Street West

Toronto 110, Ontario.

1.

SUMMARY AND CONCLUSIONS

Within the claim group, there are five weak electro magnetic anomalies. These anomalies are located over lakes and are of a poor low to high frequency ratio.

INTRODUCTION

Based on a study of all available data, i.e., geological, photogeological, assessment work reports of the Perrigo Lake Area of Northwestern Ontario, it was felt that the geological environ ment was favourable for possible base metal mineral deposits. As as result of this study, a ninety-seven square mile area was selected and then investigated by an electromagnetic survey.

In all 390.0 traverse miles and 10.8 control miles were flown at ^ mile spacing.

RELEVANT DATA OF ELECTROMAGNETIC SURVEY

Survey Firm

Dates of Survey undertaken

Line miles flown

Aircraft height

"Bird" height

Line Spacing

Lockwood Survey Corp. Ltd. ,

September 29,30 and October l, 1968

390.0 traverse miles 10.8 control miles

450 feet above ground


^ mile

ELECTROMAGNETIC SURVEY

1. Electromagnetic System

The electromagnetic system used for this survey was the dual frequency phase-shift measuring equipment developed by M.Puranen, A.Kahma and V.Ronka, working under the auspices of the Geological Survey of Finland. Further development work was undertaken by V.Ronka.

2.

The instrument consists of a horizontal transmitting coil generating electromagnetic fields at two frequencies, 400 c.p.s. and 2,300 c.p.s., and a vertical receiving coil located in a towed "bird" behind and below the aircraft; the horizontal transmitting coil is mounted between the wings and tail of the aircraft. Phase detecting circuits in the aircraft equipment allow the phase-shifts of the voltages generated in the receiving coils to be measured relative to the transmitted voltages as reference; the phase-shifts are displayed on a continuous graphical recorder together with a trace of aircraft terrain clearance as measured by a radar altimeter.

The measuring system records only the changes in phase of the total field along the axis of the receiving coil. The system is effectively compensated for quadrature variations from sources other than the ground, therefore, the movement of the bird does not affect the recorded data.

The measured quantity is the phase angle; for small angles this can be shown to be proportional to the quadrature component of the secondary field generated by ground conductors. In this survey the instrumental noise has generally been about 0.05O or roughly l part in 1,200 of the primary field.

2. System Response Characteristics

The response characteristics of the dual frequency phase- shift equipment are summarized by N.R.Paterson in "Experimental and Field Data for the Dual-Frequency Phase-Shift Method of Airborne Electromagnetic Prospecting", Geophysics Vol. XXVI, No.5,pp.601-617.

3. Presentation of Data

The electromagnetic data is presented as contours of the anomaly in the low frequency response relative to the local back ground level at an interval of 0.2 . The peak value of the low frequency response at an anomaly is presented in a circle as the ratio: peak low frequency value f corresponding high frequency value.

4. Instrument Specifications

Manufacturer " Lockwood Survey Corp.Ltd.(formerly Hunting Survey Corporation Limited)

3.

Type

Frequency

Power Source

Coil Size

Power Output

Coil Separation

Sensitivity

Noise Level

Recorder

Chart Speed

Chart Ink

Dual Frequency Phase- Shift System.

400 and 2,300 cycle per second.

28 volts

Transmitter: 500 sq. feet. Receiver:High frequency: 35 sq.inches Low frequency: 41 sq. inches

High frequency: 150 watt Low frequency: 300 watt

320 feet

5 0 at 400 c.p.s. 100 at 2,300 c.p.s.

0.5 0

Mosely

3 inches per minute

Low frequency: RedAltimeter: BlueHigh frequency: Green

SURVEY PROCEDURE

All instrument calibrations were checked and adjusted immediately before and/or after take-off and checked for normal function, i.e. pen alignment, automatic stepping, standardization and degree of noise. Assuming all systems were functioning satisfactorily, the flight would proceed following predetermined flight lines marked on uncontrolled mosaics at a scale of l inch to 1,320 feet, at the predetermined separation.

The aircraft followed a systematic predetermined pattern of flight lines and tie-lines at an average elevation of 450 feet.

4.

ELEVATION CONTROL

Type

Power Source

Calibration Range

Power Output

Operating Frequency

Chart Speed

Honeywell Radar Altimeter

28 volt

0-1,000 feet

10 watt

4000 mega cycle

3 inches per minute

The position of the aircraft was recorded by a vertically mounted camera; there was no significant lag between any instrument and the recorded position. Every time the camera fired, a reference mark was printed on all records and numbered to correspond with the film frame number.

CAMERA

Manufacturer

Model

Serial No.

Exposure Interval

Film Size

Shutter

Canadian Applied Research

MK 8

8107

2.l second

35 mm

Focal Plane

DATA REDUCTION AND PRESENTATION

The flight produces positioning film, duly processed, electromagnetic and altimeter continuous records with appropriate frame numbers and field annotations, plus an operator's Daily Flight Report.

The track of the aircraft is recovered on the photographic mosaics by examination of the film; prominent features, i.e. roads, lakeshore, etc., are used for the transposition.

The intersections of tie and flight lines are accurately determined on film and transferred to the records. The frame numbers of the individual plotted points relocated on the mosaic are identified on each record.

The record is baselined with respect to the local back ground level.

The data for each survey are individually transferred to separate intercept tapes; the data transferred consist of the plotted fiducial point and the intercept of the predetermined contour interval with the trace and the position and values of highs and lows.

The intercepted data are transferred to the flight line plot by linearly interpolating between plotted fiducial points. The transferred data are then contoured and subsequently fair drawn.

PERSONNEL

Pilot

Engineer

G. Lehmann National Aviation Management Corp. Vancouver, B.C.

W. TeeceLockwood Survey Corp. 1450 O'connor Drive, Toronto 16, Ontario.

Ltd. ,

Navigator D. FenwickLockwood Survey Corp. Ltd. 1450 O'connor Drive, Toronto 16, Ontario.

Operator T. Pederson Lockwood Survey Corp. 1450 O'connor Drive, Toronto 16, Ontario

Ltd. ,

Data Reduction R. WhittonLockwood Survey Corp. Ltd., 1450 O'connor Drive, Toronto 16, Ontario.

RESULTS OF THE ELECTROMAGNETIC SURVEY

The results of the aero electromagnetic survey are derived from a survey conducted by Lockwood Survey Corporation Limited. The electromagnetic contours represent the observed low frequency response relative to the local background level at an interval of 0.2 O .

Electromagnetics

The anomalies, with few exceptions, are coincident with Lakes. The largest anomaly is coincident with a magnetic trend through Grace Lake (O.D.M. map 45-c). This anomaly occurs on lines 111 and 112 and is in the vicinity of the Sol d'Or and could be a significant anomaly.

All of the aeroelectromagnetic anomalies are of weak response and because they are associated with lakes, which may have silty or clay bottoms which would tend to magnify the electromagnetic response; it is concluded that these electro magnetic results are not encouraging.

Respectfully submitted, C. C. RUSTON AND ASSOCIATES

Norman Firth, P.Eng.

C.C.Ruston, P.Eng. July 9, 1969.

52N08SE0856 63.2733 MCNAUGHTON 020

REPORT ON A MAGNETIC SURVEY

FERRIGO LAKE AREA - ONTARIO

C. C. Ruston b Associates 2001 - 89 Richmond Street West

Toronto 110, Ontario

1.

NUMMARY AND CONCLUSIONS

The magnetic map clearly defines the different lithological units within the area.

The claim group staked within the confines of the airborne magnetic survey is located on a north-north-west trending band of magnetics interpreted as being associated with volcanic rock types.

INTRODUCTION

Based on a study of all available data, i.e., geological, photogeological, assessment work reports of the Perrigo Lake Area of Northwestern Ontario, it was felt that the geological environ ment was favourable for possible base metal mineral deposits. As a result of this study, a ninety-seven square mile area was selected and then investigated by an aeromagnetic survey.

In all 390.0 traverse miles and 10.8 control miles were flown at h mile spacing.

RELEVANT DATA OF MAGNETIC SURVEY

Survey Firm Dates of surveyundertaken Line miles flown

Aircraft height Line Spacing

Lockwood Survey Corp. Ltd., October l, 2, 1968

390.0 traverse miles10.8 control miles

450 feet above ground \ mile

MAGNETIC SURVEY

l- The airborne Magnetometer

The instrument used for this survey was the Gulf MK III Fluxgate Magnetometer which measures the strength of the earth's total magnetic field in the direction of maximum force. The instrument was housed in the stinger section of the plane's tail, the controls and recorder being housed in the aircraft.

The instrument was used with full scale deflection of 600 gamma with a noise level of i 2 gamma.

2. Presentation of Data

The magnetic data is presented as contours of the total magnetic field at a basic interval of 20 gamma with multiple intervalswhere the gradient warrants.

2.

The diurnal variation was removed by the standard procedure of closing the loop and distributing the misclosure.

The contour map has been reduced for convenience to an arbitary datum of 4000 gamma; the 4000 gamma reading on the map represents a true reading of about 61,5000 gamma.

3. Magnetometer System

Manufacturer

Type

Power Source

Sensitivity

Step

Noise envelope

Recorder

Chart Speed

SURVEY PROCEDURE

Gulf Research and Development Corp.

Mark III Fluxgate

28 volt

600 gamma

500 gamma

2 gamma

Gulf

6 inches per minute

All instrument calibrations were checked and adjusted immediately before and/or after take-off, and checked for normal function, e.g., pen alignment, automatic stepping, standardization and degree of noise. Assuming all systems were functioning satis factorily, the flight would proceed following predetermined flight lines marked on uncontrolled mosaics at a scale of l inch to 1,320 feet, at the predetermined separation.


ELEVATION CONTROL

Type

Power Source

Calibration Range

Power Output

Operating Frequency

Chart Speed

Honeywell Radar Altimeter

28 volt

0-1,000 feet

10 watt

4000 mega cycle3 inches per minute

3.


CAMERA

Manufacturer

Model

Serial No.

Exposure interval

Film Size

Shutter



MK 8

8107

2.l second

35 mm

Focal Plane

The flight produces positioning film, duly processed, magnetometer and altimeter continuous records with appropriate frame numbers and field annotations, plus an operator's Daily Flight Report.

The track of the aircraft is recovered on the photographic mosaics by examination of the film; prominent features, i.e. roads, lake-shore, etc., are used for the transposition.


The flight line network is divided into conveniently sized circuits and from one intersection as reference, the magnetic closure error around each circuit is determined and distributed uniformly around each circuit such that the correction applied to the magnetic baseline results in a uniform datum of all these magnetometer records throughout the area; this is the datum used for contouring. If the flight lines are very short, a single control line is used to apply a constant datum to all lines assuming zero drift.

4.

The data for each survey are individually transferred to separate intercept tapes; the data transferred consist of the plotted fiducial point and the intercept of the predetermined contour interval with the trace, and the position and values of high and lows.

The intercepted data are transferred to the flight line plot by linearly interpolating between plotted fiducial points. The transferred date are then contoured, and subsequently fair drawn.

PERSONNEL

Pilot

Engineer

Navigator

Operator

Data Reduction

G. LehmannNational Aviation Management

Corp. Vancouver, B.C.

W. TeeceLockwood Survey Corp. Ltd., 1450 O'connor Drive Toronto 16, Ontario.

D. FenwickLockwood Survey Corp., Ltd. , 1450 O'connor Drive, Toronto 16, Ontario

T. PedersenLockwood Survey Corp.,Ltd., 1450 O'connor Drive Toronto 16, Ontario

R. WhittonLockwood Survey Corp, 1450 O'connor Drive, Toronto 16, Ontario.

Ltd.

MAGNETIC SURVEY RESULTS

The results of the airborne magnetic survey were compiled by Lockwood Survey Corporation Limited.

The magnetic contours represent the total magnetic field (an arbitrary datum of 4000 gammas representing a true reading of about 61,500 gammas) at a basic interval of 20 gammas.

MAGNETICS

With reference to Ontario Department of Mines maps P.406 and 45c it becomes apparent that the magnetic map defines the different lithological units within the claim group. The acidic metavolcanics and metasediments tend to show weaker responses than the volcanic rocks and undifferentiated basic intrusions. An exceptionally high amplitude anomaly (+5000 gamma) is observed to the north of Okanse Lake. This anomaly has a strong north-south trend.

The claim group is located on a north-northwest trending band of magnetics which are interpreted as being associated with volcanic rocks with sediments lying on both flanks.

Respectfully submitted, C. C. RUSTON Z ASSOCIATES

r? A,Norman Firth, P.Eng.

C. C. Ruston, P.Eng. July 9, 1969

52N88SEea56 63.2733 MCNAUGHTON 030

RE PORT ON A RADIOMETRIC SURVEY

PERRIGO LAKE AREA - ONTARIO

C. C. Ruston Se Associates 2001 - 80 Richmond Street West

Toronto 110, Ontario

1.

SUMMARY AND CONCLUSIONS

There are no significant radiometric anomalies or trends within the claim group. No significant radiometric responses were recorded.

INTRODUCTION

Based on a study of all available data, i.e., geological, photogeological, assessment work reports of the Perrigo Lake Area of Northwestern Ontario, it was felt that the geological environment was favourable for possible base metal mineral deposits. As a result of this study, a ninety-seven square mile area was selected and then investigated by a radiometric survey.

In all 390.0 traverse miles and 10.8 control miles were flown at ^ mile spacing.

RELEVANT DATA OF RADIOMETRIC SURVEY

Survey Firm

Dates of Survey undertaken

Line miles flown

Lockwood Survey Corp. Ltd.,

September 29, 30 October l, 1968

390.0 traverse miles 10.8 control miles

Aircraft height

Line Spacing

TYPE OF INSTRUMENT USED


\ mile

A Harwell 1531A Scintillation Counter was used.

The detector consists of three sodium iodide crystals (thallium activated) each 4.65 inches in diameter by l inch thick.

When exposed to gamma radiation the crystals fluoresce and the frequency of fluorescence is a function of the rate of radiation.

The crystals are optically coupled to large diameter photo- multiplier tubes which detect the fluorescence and send electrical impulses to ratemeters. Output from the ratemeter is a current whose amplitude is a function of the counting rate.

2.

The record from the instrument is in the form of an analog chart in red ink on the moving paper tape.

Response of the instrument is 180 to 200 counts per second per micro-Roentgen per hour.

Integrating time used in the survey was 0.5 seconds.

The scintillation profile was recorded on a 5-inch single channel chart driven at 3 inches per minute.

Recording range was 2000 counts per second across a five-inch recording width.

SURVEY PROCEDURE

All instrument calibrations were checked and adjusted immediately before and/or after take-off, and checked for normal function, e.g., pen alignment, automatic stepping, standardization and degree of noise. Assuming all systems were functioning satis factorily, the flight would proceed following predetermined flight lines marked on uncontrolled mosaics at a scale of l inch to 1,320 feet, at the predetermined separation.


ELEVATION CONTROL

Type " Honeywell Radar Altimeter

Power Source " 28 volt

Calibration Range " 0-1,000 feet

Power Output " 10 watt

Operating Frequency " 4000 mega cycle

Chart Speed " 3 inches per minute

3.


CAMERA

Manufacturer "

Model

Serial No.

Exposure Interval "

Film Size "

Shutter



MK 8

8107

2.1 second

35 mm

Focal Plane

The flight produces positioning film, duly processed, radiometric and altimeter continuous records with appropriate frame numbers and field annotations, plus an operator's Daily Flight Report.

The track of the aircraft is recovered on the photographic mosaics by examination of the film; prominent features, i.e., roads, lake-shore, etc., are used for the transposition.


The radiometric record is baselines with respect to the local background level.

The data for each survey are individually transferred to separate intercept tapes; the data transferred consist of the plotted fiducial point and the intercept of the predetermined contour interval with the trace, and the position and values of high and lows.

The intercepted data are transferred to the flight line plot by linearly interpolating between plotted fiducial points. The trans ferred data are then contoured, and subsequently fair drawn.

PERSONNEL

4.

Pilot

Engineer

Navigator

Operator

Data Reduction

G.LehmannNational Aviation ManagementCorp., Vancouver, B.C.

W.TeeceLockwood Survey Corporation Ltd1450 O'connor DriveToronto 16, Ontario

D.FenwickLockwood Survey Corporation Ltd1450 O'connor DriveToronto, Ontario.

T. PedersenLockwood Survey Corporation Ltd1450 O'connor DriveToronto 16, Ontario

R.Whit tonLockwood Survey Corporation Ltd1450 O'connor Drive,Toronto 16, Ontario

RESULTS OF RADIOMETRIC SURVEY

The results of the radiometric survey are derived from a survey conducted by Lockwood Survey Corporation Limited. The radiation contours represent the observed response above background at intervals of 100 counts per second from a scintillation counter having a sensitivity of 180 counts per second micro-roentgen per hour. No correction has been made for variations in ground clearance.

RADIOMETRICS

No significant radiometric responses were recorded.

Respectfully submitted, C. C. RUSTON AND ASSOCIATES

Norman Firth, P.Eng.

C. C. Huston,P.Eng. July 9, 1969

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k.k. 513923

aimAREA OF

SHABUMENI LAKEDISTRICT OFKENORA

PATRICIA PORTION

RED LAKE MINING DIVISION

SCALE: 1-INCH 3=40 CHAINS

LEGEND

PATENTED LANDCROWN LAND S ALELEASES

LOCATED LANDLICENSE OF OCCUPATIONMINING RIGHTS ONLYSURFACE RIGHTS ONLYROADSIMPROVED ROADS

KING'S HIGHWAYSRAILWAYSPOWER LINES

MARSH OR MUSKEGMINES

CANCELLED

C-S.

LocL.O

M.ROS R O

•K

c.

NOTES400' Surface R igMs Reservation

around a ll Lakes a nd Rivers

DATE OF ISSUE

MAY Z *

DEFT, QF HUES

PLAN NO. M-2665DEPARTMENT OF MINES

- ONTARIO -

CX1 (D (D

cuxDO

m

m

OJ CDCD IT)

52N08SE*656 63.3733 MCNAUGHTON

LONG LAC

MCNAUGHTON TOWNSHIP

MINERAL

HONEYWELL

TOWNSH P EXPLORATIONS

LIMITED

Okanse

COSTELLO

TOWNSHIPAGNEW TOWNSHIP

LOCATION MAP

LEGEND

MEAN FLIGHT LINE SPACING _ ^ — — . _ . - ^ l 32 O FEET

MEAN GROUND CLE ARANCE _ _ _ _ _ _ _ _ . - 500 FEET

FLIGHT LINES

FIDUCIAL POINTS- _____________ O 3690

ELECTROMAGNETIC CONTOURS

THE CONTOURS REPRESENT THE RESULTANT PHASE ANGLE AT

400 CYCLE IN UNITS OF PHASE ANGLE (DEGREE)

PROPERTY BOUNDARY--- . . -, ... . . -. ~ —~

(Long Lac Mineral Explorations Ltd.)

PROPERTY BOUNDARY. _ _ ^ . ..-. ̂ -.. - . ... ...—— — ™ ~

AIRBORNE GEOPHYSICAL SURVEY

Information derived from a survey by

LOCKWOOD SURVEY CORPORATION LIMITED

1000

SCALEO [OOP 200O 3000 4000 5000

FEET FEETl Inch to 1320 Feet

LONG LAC MINERAL EXPLORATIONS LTD.HONEYWELL TOWNSHIP RED LAKE MINING DIVISION ONTARIO

ELECTROMAGNETIC MAP

112 KING STREET, WEST

TORONTO ONTARIO

DRAWN: G RAMSEYREVISED:FILE:

DATE: FEB 10/70DRAWING: 70/12SCALE: i";'/4 M i LE

N.T.S. REFERENCE: 52 - N -2

Drafting by JOHN A.BELBIN in contract with MINE OFFICE PERSONNEL SERVICES LIMITED

MCNAUGHTON

TOWNSHIP

HONEYWELL

TOWNSHIP

51-

LOCATION MAP

LEGEND

MEAN FLIGHT LINE SPACING . - ̂ ,, . . . ̂ . l 32 O FEET

MEAN GROUND CLEARANCE - — - - - — - - . - 500 FEET

FLIGHT LINES ----- — — -.--------

FIDUCIAL POINTS

CONTOUR INTERVAL ^ .. ̂ ^ ..... ^

l 00 GAMMA CONTOUR - .... .. ^ -.

20 GAMMA CONTOUR- .... ...- ,.. ..

MAGNETIC LOW — — — . .

STRONG MAGNETIC GRADIENT(500 GAMMA CONTOURS) ~~ ~~ "

PROPERTY BOUNDARY - —— — - - -

(Long Loc Mineral Explorations Ltd.)

PROPERTY BOUNDARY-— -—- -

— Q 3690

20 GAMMA

AIRBORNE GEOPHYSICAL SURVEY



IOOO

SCALEIOOO 2000 3000 40OO 50OO

FEET FEETl Inch to I32O Feet

LONG LAC MINERAL EXPLORATIONS LTD.HONEYWELL TOWNSHIP RED LAKE MINING DIVISION ONTARIO

MAGNETOMETRIC SURVEY


TORONTO ONTARIO

DRAWN: JA.BELBINREVISED:FILE:

DATE: 12 FEB 70DRAWING: 70/122SCALE: MILE

N.T.S. REFERENCE: 52 -N -2

Drafting by JOHN A.BEIBIN in contract with MINE OFFICE PERSQNNFl SERVICES LIMITED

.-- — -J

MINERAL

HONEYWELL

TOWNSHIP EXPLORATIONS

MC NAUGHTON

TOWNSHIPLIMITED

Okonse

COSTELLO TOWNSHIP

TOWNSHIP

LOCATION MAP

LEGEND

MEAN FLIGHT LINE SPACING _ ^ _ — - - . . - l 32 O FEET

MEAN GROUND CLEARANCE - — - - -. — - -, . -500 FEET

FLIGHT LINES

FIDUCIAL P OINTS^ _ _______-_____ O 3690

RADIOMETRIC CONTOURS 500,lOOOetc. — — — — — .

IOO.2OO 300 etc.—— — — -

THE RADIATION CONTOURS REPRESENT THE OBSERVED

RESPONSE ABOVE BACKGROUND AT INTERVALS OF IOO

COUNTS PER SECOND FROM A SCINTILLATION COUNTER

HAVING A SENSITIVITY OF ISO COUNTS PER SECOND

MICRO-ROENTGEN PER HOUR

NO CORRECTION HAS BEEN MADE FOR VARIATIONS IN

GROUND CLEARANCE

PROPERTY BOUNDARY^ ^ ______. _____ .. ,. ,

(^Long Lac Mineral Explorations Ltd.)

PROPERTY BOUNDARY... . . .^....... . .. ....— — -

AIRBORNE GEOPHYSICAL S URVEY



IOOO

SCALEIOOO 2000 3000 4000 5000

FEET FEETl Inch to 1320 Feet

LONG LAC MINERAL EXPLORATIONS LTD.HONEYWELL TOWNSHIP ft ED LAKE MINING DIVISION ONTARIO

RADIOMETRIC SURVEY


TORONTO ONTARIO

DRAWN: D ADAMSREVISED:FILE:

DATE: FEB 10/70DRAWING. 70/120SCALE, l":'/4 MI LE

N.T.S. REFERENCE: 52 - N - 2

Drafting by JOHN A. BELBIN in contract with MINE OFFICE PERSONAL SERVICES LIMITED

report on an electromagnetic survey perrigo lake … · 2017. 1. 17. · report on a magnetic...

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