41J07NW9370 BOLGER 0011 JUILLETTE 010

REPORT OH

AIRBORNE MAGNETOMETER SURVEY

IN THE

ELLIOT LAKE AREA

FOR

DENISOK MINES LIMITED

BY

CANADIAN AERO MINERAL SURVEYS LIMITED

Project No. 7067

OTTAWA, Ontario, Doceiaber 18, 1967.

W. Schuur, M.Se Geophysicist^

o.b-n

41J07NW9370 BOLGER 012141 JUILLETTE 010C

TABLB OF CONTENTS

I. INTRODUCTION

IX. SURVEY AND COMPILATION DATA

III. GEOLOGY

IV. INTERPRETATION OP RESULTS

Pago

l

I

3

4

Accompanying this Reportt-

- Four Isomagnetic Contour Maps at the scale

of T' - fc mil*.

REPORT OND ^AIRBORNE MAGNETOMETER SURVEY

IN THE ELLIOT LAKE AREA

FOR DENISON MINES LIMITED

I. INTRODUCTION

Between August 25 and August 29, 1967 and between

November 9 and November 29, 1967, Canadian Aero Mineral Surveys

Limited carried out a combined electromagnetic, spectrometer and

magnetometer survey in the Elliot Lake area, Ontario, on behalf

of Denison Mines Limited.

This report pertains to the airborne magnetometer phase

of the programme only.

II. SURVEY AND COMPILATION DATA

This survey was flown by the Canadian Aero Mineral

Surveys Limited geophysically equipped Otter, registration CF-IGM,

based at Elliot Lake for the August period, at Gore Bay for the

November period. Flight lines in Magog Lake and Matinenda Lake

areas were oriented approximately east-west, while in Moon Lake

and Little Moon Lake areas flight line direction was due north.

Flight line spacing in the areas was 1/16 mile. Geophysical data

acquired totalled approximately 840 line miles.

The following Canadian Aero Mineral Surveys Limited

personnel were associated with the project:-

G.P. Smith Project Manager and Navigator

R. Youngberg Project Manager and Operator

CANADIAN AEROUIIIM*

- 2 -

G. Carter Pilot, Navigator

D. Reynolds Pilot, Navigator

R.S. Skinner Operator

L. Monea Operator

G. Malo Aircraft Mechanic

R. Chapman Data Compiler

W. Knappers Data Compiler

D. Fitzsimmons Draftsman

W. Schuur Geophysicist.

The magnetometer used in this survey was the total

magnetic intensity "Flux Gate" saturable core instrument, developed

by Gulf Research and Development Company. The instrument is

installed in the fuselage of the aircraft. Five sensitivity settings

are available: 300, 600, 1200, 2400 and 4800 gamma for full 12 inch

deflection. Corresponding step values are respectively 250, 500,

1000, 2000 and 4000 gamma. The usable short term sensitivity is

approximately 5 gamma and the total dynamic range is 250,000 gamma

for the 1200, 2400 and 4800 gamma sensitivity. For the present

survey a sensitivity setting of 1200 gamma for full scale deflection

was used.

The magnetic profile is displayed on a Gulf Research and

Development rectilinear recorder with 12 inch chart width.

The flight path of the aircraft is recorded by an

Aeropath AS-5 continuous strip, 35 mm. camera. The camera is

synchronized with the magnetometer record by means of a fiducial

CANADIAN AERO ,

- 3 -

numbering system. Path recovery is accomplished by relating this

strip film to an airphoto composite of the area. Identified

points are designated by their fiducial numbers.

An overlay of the airphoto mosaic showing the fiducial

points provides the base for the isomagnetic contour map. After

a line-to-line comparison of the levels of the magnetic records,

to reduce the profiles to the same level, the profiles are

transcribed from the tapes to the plan map. These data are then

contoured at 50 gamma intervals and drafted. The isomagnetic

contours of the survey area are presented on four maps at a scale

of l" ~ \ mile.

III. GEOLOGY

The geology of the area is described in Paper 56-7 of

the Geological Survey of Canada, Geological Sketch

Map A468, Blind River Area 1959 - Scale l" ~ 2 miles

and in Geological Report No. 20, Ontario Department of

Mines, 1964.

The four blocks surveyed all fall within a belt of

sediments of the Bruce Group, folded in the gently westerly

plunging Chiblow anticline. With a possible exception of the

northernmost part of Moon Lake area, the sediments underlying the

survey blocks belong to the Missisagi formation. Intrusive diabase,

both a s dykes and as sills is widespread in the area. A great

number of faults and fault zones are reported in the area, of

which the Lake of the Mountains Fault and the Moon Lake Fault are

CANADIAN AERO

- 4 -

the most prominent.

IV. INTERPRETATION OF RESULTS

1) Magog Lake Area

This area is characterized by a rather intricate but

weak magnetic pattern, striking approximately east-west, which

for the major part appears to be due to differences in magnetic

susceptibility in the sedimentary series, since most of the

anomalies are of too small a size and width to be caused by

major geologic structures. Two diabase dykes cut through the

survey area in an approximate northwest direction, one in the

northeastern part of the map, situated over McFadden Lake, the

other in the southwestern corner of the map. The southwestern

dyke has been mapped geologically as quartz diabase. The

northeastern dyke is shown on the geologic map as a fault, and

it is likely related with an intrusion in this fault zone.

The magnetic anomaly of over 1400 gamma, observed in

the northeastern corner of the survey area is part of a major

diabase dyke system, which on the magnetic composite map can be

followed for many miles in both northwest and southeast directions.

The positive anomaly observed northwest of the Lake of

the Mountains and the anomaly over the south end of Magog Lake

are both located parallel to and approximately 1200 feet off the

mapped Lake of the Mountains Fault. They probably reflect the

magnetic basement uplift caused by this fault zone. The surface

expression of this structure can be observed from the sudden

CANADIAN AERO

- 5 -

break in the northwestern diabase dyke.

2) Matinenda Lake Area

This survey block is centered around the axial plane

of the Chiblow anticline. The very smooth magnetic pattern is

indicative of sediments. The irregular magnetic contours in

both the southwest and southeast corner of the block correspond

with the geologically mapped diabase instrusion. The unexpected

irregular pattern could have been partly caused by overcorrection

of the records. The very broad 100 gamma positive anomaly south

of Brundage Bay is very likely due to a basement high. This

might be correlated with the axial plane of the anticline, which

would tend to indicate a northern dip of the axial plane.

The wide 400 gamma positive anomaly, which extends fromt

Traverse 35 fiducial 4300 to Traverse 49, fiducial 6340 appears

best explained as a deep seated diabase dyke.

3) Moon Lake and Little Moon Lake Areas

Again the low magnetic relief indicates most of the area

to be underlain by sediments. The double band of positive magnetic

anomalies extending from the northwest corner of the survey block

to Traverse 51, fiducial 3260 is the expression of two fairly wide

diabase dykes. They are approximately 3,500 feet apart in the

northwest and presumably join to one single feature to the southeast,

The dykes are apparently cut off by a northeast striking wrench

fault, with apparent displacement of the northwestern block to the

northeast. South of the dyke system and west of the fault zone

CANADIAN AEROLtKlfl*

- 6 -

the higher magnetic pattern indicates the presence o,f a large

body of basic intrusives. Just north of Matinenda Lake and

south of the fault zone the presence of another, narrow, basic

dyke is indicated by an elongated positive magnetic anomaly.

In the northeastern part of the survey block, crossing Little

Moon Lake and Moon Lake is a line up of small isolated anomalies

with an approximate direction NAS0^ - S450E. This appears to be

the magnetic expression of the right hand strike-slip fault

indicated on the geologic Map as Moon Lake Fault. The slightly

more complicated magnetic pattern, observed in the small area

south of Gullbeak Lake is normally associated with intrusive

intermediate rock types. However, in this case the higher magnetic

subceptibility of the mapped Algoma granites as compared with the

sediments, could also have caused this feature. The same magnetic

pattern, however with larger amplitude, is again observed in the

area southeast of Baker Bay and of Little Moon Lake. The 700

gamma anomaly appe^'s to be too high for granitic rocks and it is

likely that diabase rocks have intruded along the contact between

granite and sediments.

Respectfully Submitted,

OTTAWA,Ontario, December 18, 1967.

W. Schuur, M.Se Geophysicist.

CANADIAN AERO

11J07NW9370 BOLGER 884! JUILLETTE

REPORT ON

0S0

AIRBORNE ELECTROMAGNETIC SURVEY

IN THE

ELLIOT LAKE AREA

FOR

DENISON MINES LIMITED

BY

CANADIAN AERO MINERAL SURVEYS LIMITED

Project No. 7067

OTTAWA, Ontario January 3, 1967.

Robert W. Sttmp, P.Eng., Chief Geophysiciet.

41J07NW9370 BOLGER 0041 JUILLETTE 020C

T A B X. BOP CONTENT S

J, INTRODUCTION

II. GEOLOGY

III DISCUSSION OF RESULTS

APPENDIX II - (a) Equipment

(b) Records

Pa&a

1

2

2

(c) Survey and Hap Compilation Procedures

(d) Data Presentation System.

thic Report; -

One Plan Hap at a scale of i"

RETORTA.TRBQIiflE SURVEY

ELLIt LAKS AREA

PENISOH MINES LIMITED

I. ICOTRODUCTIOH

This report pertains to the EM portion of an airborne geophysical survey flown on behalf of Denison Mines Limited in the Little Moon Lake area near Elliot Lake, Ontario. Tha flying was accosaplithad by the Canadian Aero Mineral Surveys Limited geophyaically equipped Otter aircraft (registration CF-IGM) based at Gore Bay, Ontario. The flying t,*as completed by November 29, 1967,

Flight lines were spaced at 1/16 mile intervals and ward oriented north-south. A maan terrain clearance of 150* was maintained throughout the survey. The geophysical data acquired totalled approximately 97 lino ciiles.

The following Canadian Aero Mineral Surveys Limited personnel were associated with the project:

O.P. Smith

O. Carter

D. Reynolds

R. * Youngberg

R. Skinner

L. Mcnaa

K. Chapman

D. Fltzslnraone

R.W. Stamp

Project Manager and Navigator

Pilot end N j-v lg* t or

Pilot and Navigator

Operator

Operator

Operator

Data Compiler

Draftsman

Geophysicist.

- 2 -

The results are presented on a plan nap at a scale of

l0 m ^ mile which accompanies this report. An airphoto laydovn

provided the base for this map.

IX. GEOLOGY

The following map has been used as a reference:

Ontario Department of Mines -Map 0 P. 304 - 1967

Scale: l" - 2 miles.

the claim group is underlain for the moat part by

Mi&sissagi sediments belonging to the Bruce Group. Considerable

faulting is indicated in the area, the most significant being

Moon Lake fault.

III. DISCUSSION OF RESULTSt

Ho EM anomalies were detected by the airborne survey

but this is not uncsual in this particular geological environment,

respectfully submitted,

OTTAWA, Ontario, Robert W. R temp, P.Kng., January 5* 1968. Chief Geophysicist.

APPENDIX II

A. EQUIPMENT

The electromagnetic unit, magnetometer and scintillation spectrometer, a rc t he key instruments in the Canadian Aero Mineral Surveys Limited Otter survey system. The remainder of the equipment consists of a radio-altimeter, an accelerometer, a continuous-strip camera, three recorders and a fiducial numbering system.

The EM unit is the low frequency (320 c.p.s.)in-phase/out-of-phase system designed by Mullard Ltd. of England and operated formerly by Riocanex. The transmitting and receiving coils are mounted on the wingtips of the Otter, with a vertical coplanar orientation and a separation of 61 feet. An electronic null device is adjusted so that in the absence of a conductor within the range of the system no signal is recorded. The anomalous signal is divided into two components, the "in-phase" component having the same phase as the transmitted field and the "quadrature" or "out-of-phase" component being at right angles to it. These two measurements are recorded on two channels of the six-channel recorder.

Variations in the total magnetic field of the earth are measured by a Gulf Fluxgate magnetometer mounted in the aircraft. Anomalies as small as 10 gammas can normally be distinguished. The output of the magnetometer is presented as one channel on the six-channel recorder to facilitate correlation with the EM traces. It is also presented at a larger scale and in rectilinear form on a separate recorder, these recordings being used in the preparation of isomagnetic contour maps whenever they are required.

An APN-1 radio altimeter provides a terrain clearance profile on one channel of the six-channel recorder. Because EM response decays rapidly with increasing altitude this altitude information is important in the analysis of the EM data.

A vertical accelerometer mounted in the aircraftprovides a record of the air turbulence and of any drastic manoeuvres of the aircraft. The accelerometer trace on the six-channel recorder is often helpful in recognizing spurious blips on the EM traces caused by air turbulence or drastic manoeuvres.

The gamma ray spectrometer is manufactured byHanmer Electronic Products, a division of the Harshaw Chemical Company, to Aero Services specifications. Three 6-inch diameter by 6-inch thickness thallium activated sodium iodide crystals are utilised. Ratemeter ranges cover count rates from 100 c.p.s. to100,000 c.p.s. with a choice of time constants from 0.25 to 10 seconds. Upper and lower threshold settings are continuously

APPENDIX II - cont'd. Page 2

adjustable allowing for the di se r imi nation of potassium, uranium and thorium. Results are presented on a separate rectilinear recorder .

The entire flight path is photographed by a vertically- mounted Aeropath 33 mm. coni imiour-strip camera.

Sy.'.chroni/.ation of the film strip with the three recorders is accomplished by means of nn automatic fiducial numbering system which prints simultaneous time markers on all records at regular time intervals, normally every ten seconds.

B. DESCRIPTION OF RECORDS

Rectilinear Magnetic Re c o r d

With the chart oriented so that fiducial numbers increase from right to left, upward deflections on the chart indicate increases in the total magnetic field of the earth. On the 600 scale the smallest division on the chart is approximately equivalent to 5 gammas. When the record "steps" a change of approximately 500 gammas is indicated. On the "1200" scale the smallest division is 10 gammas and a step 1000 gammas.

The fiducial marks are normally spaced at 10-second intervals, a spacing which is equivalent to approximately 1500 feet on the ground. The exact horizontal scale of the tape can be established by measuring the fiducial spacing on the map.

Brush Six-Channel Record

With the chart oriented so that fiducial numbers increase from right to left the tracings from the bottom to the top of the chart arc as follows:

(1) Fiducial markers - same comments as above

(2) Magnetometer - positive upward. On the 600 scale l mm. is approximately equivalent to 7.5 gammas and a step is a p prox i ma t ely 500 gamma s.

(3) KM In-I'hase - positive upward. l r.n. represents approximately 20 parts per million, referred to the primary field at the receiving coil. The scaie is linear until approximately 600 p,p.m. is reached, after which compression occurs to a level of 1200 p,p.m., beyond which the value it; "off-scale 11 .

(4) KM Quadrature - positive upward. Same scale as In-Phase.

APPENDIX li - coni 'd. Page 3

(5) Altimeter - increasing altitude upward. Centre line position approximately 150 feet. Scale below 150 feet approximately i) feet, per mm. Scale above 150 feet approximately 7 feet per mm.

(6) Accelerometer - an acceleration of 173"G" is equivalent to a 5 mm. deflection from the central point.

C . SURVEY AND MAP COMPILATION PROCEDURES

Uncontrolled airphoto mosaics usually serve as base maps foi* flying the survey and for compilation of the geophysical data. The most common scale is 1/4 mile per inch.

The flight lines are oriented perpendicular to theassumed longest dimension of massive sulphide occurrences anticipated in the survey area. Occasionally two or more line directions have to be used to accommodate changes of geological strike within the area. Line spacings normally range between 1/8 mile and 1/4 mile.

The navigator is provided with "flight strips" of the area to be surveyed These flight strips are a copy of the airphoto mosaic, with the intended flight lines inked r. nd numbered. Navigation along the parallel flight lines is accomplished by visual means based on the physical detail observed on the photos. The aircraft is flown at a terrain clearance of 150 feet or, in rough terrain, at the lowest safe altitude.

Flight path is recover*. 'l in the field by comparison of the 35 mm. strip film with the airphoto mosaic?,. Identifiable points are marked on the mosaics and designated by numbers determined from the fiducial nunbering system on the film. These recovered flight lines provide the positional basis for plotting the geophysical data. The EM anomalies are listed and graded in the field and are often plotted on the field mosaics to permit immediate acquisition of ground.

In our Ottawa office transparent overlays of themosaics are prepared, upon which are drafted the recovered fiducial points, the interpolated flight lines positions, the key planimetric features as traced from the mosaics, and the significant geophysical data. The geophysical data are subjected to a careful analysis by a geophysicist who prepares an interpretation report including recommendations for further work.

APPENDIX II - cont'c1 Page 4

D. DATA PRESENTATION

The data presentation procedure which ve employ for the Otter geophysical systen is a combination of an anomaly listing and a plan map plot of graded EM anomalies. The anomaly listing provides the significant details concerning each anomaly and the map gives a "bird's eye viev" of the conductors detected.

For purposes o t" listing and to facilitate reference in the report each KM anomaly is assigned a "name", v'lich is made up of the number of the line upon which the anomaly occurs plus a letter. For example, on line 257 anomalies would be named 257A, 257B, 257C, etc., from south to north or from v?est to east. The letter which appears beside each EM anomaly on the map is therefore part of its name. These names also appear on the Brush records and in the anomaly list.

The anomaly list contains the fiducial numbers at the edges of the EM anomaly, the in-phase and quadrature amplitudes in p.p.m. , the altitude at which the anomaly was detected, the positional relationship of the EM anomaly to magnetic anomalies (if any), a rating, and comments concerning any other pertinent characteristics of the anomaly.

The nomenclature used in the "magnetics" column of the anomaly list requires some explanation. The main terms used are side, flank, edge and direct. These refer to the position of the EM peak relative to the axis of the magnetic feature. "Direct" depicts coincident peaks and similar widths; "edge" is slightly offset; "fl^.nk" is somewhere along the flank of the magnetic anomaly; 'side" is down near the base. "N. Flank 800g" means that the EM anomaly occurs along the northern flank of a magnetic feature of 800 gammas total amplitude. When one peak of a multiple EM anomaly coincides with a magnetic high the specific peak may be designated. For example, if the southern peak of a double EM anomaly coincided with a 250 gamma magnetic anomaly the nomenclature would be "Dir. S. 250g".

The rating assigned to each EM anomaly in the listing determines the symbol which represents the anomaly on the map. Six categories of anomalies aic defined: 1A, IB, 2A, 2B, 3, and X. The numbers "l", "2" and "3" are primarily a measure of in-phase amplitude corrected for altitude variation: "l" is for very large anomalies, "2" for intermediate, and "3" for relatively weak response. This rating is sometimes affected by the shape, by

APPENDIX II - cont'u Pago 5

the in-phasc to quadrature ratio, or by the location of the anomaly,

The letters "A" and "B" merely refer to the magnetics: "A" indicates

a directly coincident magnetic* anomaly, and "B" indicates the lack

thereof. The "X" rating is reserved for questionable anomalies.

The legend on the map shows the symbol used for each of these

ratings. In general, the more the rectargle is filled in, the

stronger the anomaly.

In the case of diroctly coincident magnetic anomalies,

the amplitude of the magnetic feature is shown on the EM map.

It is stencilled beneath the symbol which portrays the EM anomaly.

During the final interpretation stage, EM anomalies are

correlated from line to line wherever possible and the conductive

zones are outlined. Ml definite conductors are numbered on the

map and discussed in the report.

11J87NW9370 BOLGER 0041 JUILLETTE 900 File: 63.2201

THE MINING ACT

Assessment Hork Credits

Name: DENISON MINES LTD

Township or Area: LONG, STRIPER, MACK, 155, 167 SCARFE and 161

Number of Assessment work days per claim:

Geophysical 40 Airborne Electromagnetic Geo Ion i ea l_Nil

1Mining Claims:SSM 82055 and 82056 SSM 02320 to 02339 Inclusive- r*/ SSM MZJlb to b2356 1nclus1ye * SSM 02374 to 02386 Inclusive . SSM 02392 to 02425 Inclusive.-**"' SSM 02420 to 32470 Inclusive * - SSM 02480 and 82401 j ^r./s/ SSM 82572 to 82643 Inclusive'-^.' SSM 82750 to 82815 inclusive *"-- SSM 82822 to 8283] inclusive 37, w SSM 03107 to 83160 inclusive -" SSM 83162 and 83163 SSM 83165 to 83170 inclusive f v/

Geochemical Nil

^ ' ^SSM 831~74 and "031 75 , - SSM 83179 to 03102 Inclusive

j- SSM 03104 to 83187 inclusive - - 7Xt*e'i f 7wx*ssM 83109 to 03194 inclusive-* y*/*-** **- '* 'SSM 83196 to 83229 Inclusive.^-//, - .-^

' SSM 83233 to 03235 inclusive .Y.I-MJ.. "V --SSM 03238 to 03246 inclusive jrAvX-.^',

* SSM 83249 to 83266 inclusive //. ^,/ SSM 83451 to 83453 inclusive J/^A-*/ " '-^SSM 83458 .to 83464 inclusive ' '-f '-

SSM 84507 to 84695 inclusive r *'r-'X••-••- SSM 87572 to 87577 Inclusive i...

i ///"

THE MIMXMO RECORDER WAY DELETE TttB W) ;D*T8 RECORM3) ftJH KACWETWETE3I VORX Of 8T*TEMBER ?2, i967 AO THE KAPfl'ARD REWRT8 WERE WOT FILED.

Fi le i ,2264

THE MIMING ACT

Assessment Work Credits

Namei DENISON MINES LIMITED

Township or Area: 155, i61 t 167 1 Hack, Scarfe^ Strictoy t Long Townships

of Assesspent work days per claimt

Geophysical Creditsj

Airborne Magnetometer - 40 days for each of 662

SSH 82039823203234682374823928242882480

to to to to to to

8205682339

inclusive inclusive

claims numbered -^ tt 2? n ±' P*

82356 inclusive 82386 inclunive 82425 inclusive 82U78 inclusive

6 82481 R2572 to 82643 82750 to 82815 82822 to 82851 to 82858 to 82864 to 83107 B3162 83165 83174 83179 83184 83189 83196

inclusive inclunive inclusive inclusive incluaive - inclusive - inclunive

82831 82B54 82862 82867

to 83160 fi 83163 to 83170 inclusive

83175to 63182 inclusive

83187 inclusive 83194 inclusive 83229 inclusive

63233 to 83235 inclusive 33238 to 83246 inclusive 83249 to 8326ft inclusive 83451 to 83453 inclusive 83458 to 83464 inclusive 84507 to 84695 inclusive 87570 to 87578 inclusive .

to to to

89601 6 B9602 1 " P-

Airborne Electromagnetic - 40 days for each of 32 claims numbered -

SSM 82039 to 82054 inclusive 82851 to 82854 inclusive 62858 to 62862 inclusive 82864 to 82866 inclusive 8286787570 K 87571 ...r*-/*./* X 87578

2 19G8

MBIDENT GEOLOGIST8A.UU STE. MARIE

C;, l-.P ANY: Dcnison i lines Ltd.

CE: Ontario PiiWilT NO.: MX-6/68

On our Lonp; Clroup in Lon^; tov/uship, airborne Jii'I and Mag. surveys v;crc carried out during 1^6? by Canadian nero 1'dnoral Survcyc. The interpretation of the survey related the anomalies to minor ,';eolo,-;ic Gtructuroo and/or diabase dykes.

. , ., , claims were allov;ed to lapse Aaf tor f.round ezcar.nnation failed

to indicate ^ood reasons for undertokinpj sor;;e uiar.iond drilling.

Ghouinrjrd

il ,AUG M 1970

' GEOLOGISTSAULT

MARIt

The following are the educational and professional statistics

of: John L. Irvine. 380 Hunt Club Road, Ottawa, Ontario.

Born: January 30, 1940, in Vernon, B.C.

EDUCATION;

High School: Vernon Jr. Ma trie, 1958.

University of B.C. 1958 - 1964, B. Se. , Specialization

Geophysical Geology.

EXPERIENCE;

May 1962 - September 1962 -- Hudson's Bay Oil 6 Gas. Student traineeon oil exploration.

May 1963 - September 1963 Canadian Nickel Company, Studentin mining exploration. geophysicist.

May 1964 - October 1964 Kerr Addison Mines Ltd. Geophysicist inmining exploration.

January 1965 - Sept. 1965 -- Prospecting geophysics. Geophysicist.

October 1965 - present Canadian Aero Mineral Geophysicist.Surveys Limited.

I certify that the above data are as stated.s

John L. Irvine.

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