42E12NW0187 2 .669 I RWIN 010

Introduction'f'luNt'X t/ r,,)/ ^A i |vl i N C l^OiSiV.^ OvV.

In April 1973 an airborne magnetic and electromagnetic survey

was carried out in the 1'i fher-lllmhirst Township area. Part of this sur

vey covered a claim group consisting of 55 contiguous claims located on

the boundary between Pifher and Irwin Townships. The claims arc desig

nated numbers T], 287745 to TL 287784 inclusive and TJi 305145 to Th 305159

inclusive and are held by Phelps,. Dod^e j^orpqrat .tpn ..of Canada, Limited.

The work was performed by Geoterrex Ltd., survey contractor,

of Ottawa under the direction of K. \\. V'oolham. The survey was carried

out between April 19th and April 27th, 1971 with office compilation

being completed in the period June 1st to June 20th, 1971.

Location and Access

The claim group is approximately 12 miles northeast of Beard

more, Ontario and is accessible by vehicle, via all weather highways 11

and 801 to within one mile of the claim group. A bush road from highway

801 leads into the center of the claim group. This road is driveable

in tlie summer.

Referring to O. D. M. l" ^ 4 mile compilation series #2102, the

area of the claims straddles a contact between acid to intermediate lavas

to the south and basic and intermediate ruetavolcanics to the north. A

north-south diabase dyke cuts through the western portion of the claim

group. Tlie general strike of the lavas is east-west to north-east.

C l( "' i I'M A l ^ '

- 2 -

Survey^ J\rpcj:\djure

The survey was completed using a geophysically equipped Otter

aircraft, Registration GF- AYR owned and operated by Geoterrcx Ltd. The

aircraft was equipped with an In-Phase/Out-of-Phase electromagnetic sy-

stcjn operating, at 320 hx, a Geometries G-803 liigh Perforrnance Proton

Resonance Magnetometer and ancillary survey equipment. Appendix B to

this report describes this equipment as well as pertinent survey pro

cedures.

The survey was flown at 1/8 mile line spacing with a line

direction of M0 0U. The survey was part of a larger survey area cover

ing 1008 miles having an area of approximately 115 square wiles. The

line mileage within the claim group totalled 29.5 miles.

The results of the electromagnetic and magnetic surveys are

shown on separate maps at a scale of l inch ~ 1320 feet. The electro

magnetic in phase/out of phase response is shown in parts per million

of the primary field (p. p. m.) as numbers accompanying the anomaly de

signation. Aircraft altitude and magnetic correlation, if any, is

also shown. The magnetic results were, contoured at an interval of 25

gamma. The values shown are. the. total field intensity after suitable

corrections for diurnal and heading errors etc. have been made.

Results

The magnetics were quite flat over the eastern two thirds of

the claim group. One isolated anomaly 900 gamrna above background occurs

on line 28 in the extreme cast end of the group. To the west two major

- 3 -

north south lineaments are present. The strongest starts at the north

end of line 8 and trends south to the south end of line 4. This ano

maly continues off the claim group. It has an amplitude of 400 to 500

gamma above background and is quite narrow. A second weaker trend par

allelling the first occurs at the north end of lines 12 and 13. 'lids

anomaly is only 150 gamma above background and ends in the middle of

the claim group. Local weak 25 to 50 gamma single line anomalies occur

scattered about the claim group but no definite trends are produced.

A weak magnetic gradient starts on the west boundary of the claims.

E], ec trpiuajjn e t ic

Only one anomaly on line 21 was detected over the claim group.

This anomaly was broad having no in phase response and only weak 50

p. p. m. quadrature response. The weak 30 gamma magnetic correlation ano

maly is questionable. The anomaly occurs in a major swamp area.

Conclusions and- Kecpi.ancmdations

The. two magnetic north-south linears on the west side of the

claim group are probably diabase dykes. The stronger linear coincides

with a diabase dyke shown on the 4 mile compilation series. The ano

malies on line 15 may be a lso part of a diabase dyke system. The strong

local magnetic anomaly on line 28 is probably related to a small con

centration of magnetite or pyrrhotite in the basic volcanics. Other

weaker single line anomalies are possibly also similarly related.

The single electromagnetic response on line 21 is quite pro

bably an overburden effect caused by the low aircraft altitude of 125'

over a swamp area. 3 1 has no significance.

- A -

Since significant unexplainable magnetic or electromagnetic

anomalies were not detected within the clairu group further conventional

ground geophysical surveys can not be recommended. If geological re

connaissance work uncovers mineralization of interest, however, then a

new geophysical approach would of course bc necessary.

APPENDIX "B"

Following is o description of equipment and procedures used during this airborne geophysical survey.

A. EQUIPMENT

1) Aircraft;

The aircraft is a deHavilland Otter DHC-3 with Canadian registration CF-AYR. This aircraft is a single engine, slow speed, high performance type with a gross weight of 8,000 Ibs. The aircraft may be equipped with wheels, skis, or floats, as required. Normal survey speed is 100 miles per hour.

2) Elect ro m a g ne t o me t e r;

The electromagnetic unit is a Rio Tinto type, measur ing In-Phase and Out-of-Phase components of the secondary field at a frequency of 320 cycles per second. The unit was designed and built by Geoterrex, and carries Serial #1.

A transmitter generates a closely controlled sine wave of 320 cps which is amplified and fed to a transmitting coil mounted on the starboard wing-tip. This coil is iron cored and has vertical windings, with coil axis in the direction of flight. The circulating coil power is some 5000 volt amperes.

A receiving coil is mounted on the port wing, co-planar with, and 62 feet from, the transmitting coil. The voltage developed in the receiver coil due to the transmitted field is some 300 millivolts. In the absence of external conductors, this voltage is cancelled by a reference voltage derived directly from the transmitter voltage.

When the aircraft comes within range of a conductor, the normal (or primary) field is changed by a secondary field and the resultant voltage at the receiver coil is amplified and passed on to the EM receiver in the aircraft. This signal is filtered and split into one component in-phase and one component out-of-phase with reference to the transmitter voltage. The signals are then passed through phase-sensitive detectors where their amplitudes may be read on meters, or

2.

recorded on a chart. A system of calibration is included so that amplitude of responses (anomalies) may be determined in "parts per million" of the primary receiver coil voltage prior to cancellation. Noise level of the system due to movement of the metal aircraft within the EM field is norm ally 50 parts per million or less. Significant conductors depending on distance and size, will produce anomalies of more than 50 parts per million.

The system is also equipped with a receiver noise channel operation at a frequency of 268 cps. This channel is not susceptible to the electromagnetic response, and is affected only by radiated noise such as power and telephone lines, and atmospheric discharges. It is frequently useful in determining the validity of electromagnetic anomalies.

An accelerometer is also installed and the output recorded on the 8-channel recorder. This indicates flexure on the aircraft and enables discarding of false anomalies which could result from the aircraft motion.

Calibration marks are displayed on the eight-channel chart, and are approximately 15 millimeters for 200 parts per million.

Any anomalies noted are listed in Appendix A of this report, indicating position, (fiducial number on the path recovery camera), amplitudes, aircraft altitude, magnetic relationship if any, relative anomaly rating, and comments which may be of significance.

The anomalies are then plotted on the base map in coded form, according to the legend accompanying this Appendix, Anomaly groups which reflect probable ground conductors are circled and numbered. These are described and discussed in the report in the context of geophysical and where possible, geological significance.

3 ) Magnetometer:

The magnetometer used is a Geometrics Model G-803 Proton Resonance type incorporating a High Performance option. Recording times are variable, from three times per second to once per 2 seconds, with respective sensitivities of 2 gammas to 0.5 gamma. In normal use readings ore obtained

3.

once per second with a sensitivity of l gamma.

The sensing head is a torvidal coil immersed in a special hydrocarbon fluid and mounted beneath the port wing.

The magnetometer is a digital readout unit and output is used to drive a paper recorder (Hewlett Packard Model 5050-B). In addition analogue outputs are fed to the 8- channel recorder for direct comparison with the electro magnetic results, and to a Hewlett-Packard Model 680 - six inch rectalinear strip recorder.

Full scale deflection usually used in mineral surveys is 1000 gammas although other sensitivities are available. Automatic stepping of the full scale analogue deflection is incorporated. Recordings made on the paper tape are the values of the total field intensity.

Contouring of results is accomplished as desired.

4) Spectrometer:

An Exploranium DGRS-1000 spectrometer is normally carried on the Otter, along with a sensing head containing three 6" x 4" Sodium Iodide crystals.

This is a four channel differential gamma-ray unit measuring energy levels of potassium 40, bismuth 214 thallium 208 plus total count.

Time constants and full scale ranges are variable and are selected to suit the conditions and background of the survey area.

Depending on requirements of the survey, one or more channels may be recorded on the eight channel recorder.

Data presentation, if required, is usually in the form of plotted anomalies showing channel intensities and aircraft altitude. Contour maps of one or more channels may be produced in special circumstances.

5) Altimeter:

The altimeter is a GAR Model 10 wide band radar type.

t)

4.

One unit is carried on each wing. The output from the alti meter recorded on the eight channel recorder. The recording is linear and normally covers from 50 feet to 300 feet, or 25 feet per major division.

6) Camera:

The camera used for path recovery is a Hulcher contin uous strip 35 millimeter type. It can accommodate 400 ft. lengths of film, good for some 250 line miles of survey. It is fitted with a special wide angle lens for low level work.

Fiducial numbers and markers are impressed on the film and controlled by the intervalometer.

7) In t e r v alo m e t e r;

This is a Geoterrex Model X-l solid state unit which derives triggering from the magnetometer. Basic fiducial pulses are provided once for each two magnetometer readings, so that in usual operation one fiducial is recorded every two seconds. A long pulse is produced once for every ten normal fiducials.

These fiducial marks are impressed on the path recov ery film, the eight channel recorder, the Hewlett Packard Model 680 recorder and the digital printer in order to identify and locate geophysical records with ground positions*

8) E ight Channel Recorder;

This recorder is a Gulton Industries Model TR-888. Records are made on heat sensitive paper of 16 inch width. Each channel has a width of 1.6 inches. Individual signal processors are included for each channel, selected according to requirements for each channel to be recorded.

Normal chart speed is 5.0 inches per minute giving a horizontal scale of approximately^ .1000 ...fcjet .per inch.

5.

B. PROCEDURES

1) Photo Laydowns;

Prior to undertaking of the survey, air photos of the area are obtained from which a photo laydown is produced, to an appropriate scale, usually l" = 1320 feet. Proposed lines are drawn on the laydown, in the appropriate direction and line spacing. These "flight-strips" are then used by the air crew for navigating the airplane visually along the proposed lines. This photo laydown is also used to produce the subsequent base maps.

2) Aircroft Operation;

The air crew consists of pilot, co-pilot (or naviga tor) and equipment operator. The aircraft is flown along the proposed lines at an altitude of some 200 feet, using the flight strips for navigation. Altitudes in excess of 300 feet are generally considered too high for effective pene tration.

The operator records lines, direction of flight and starting and finishing fiducial numbers on a flight log. Equipment is normally left on during the whole of the survey flight, while the intervalometer is turned for the actual survey line. Thus, the appearance ucial marks on the charts indicates the extent of line.

on only of fid- the survey

3) Field Reduction:

Upon completion of the flight, the film is developed and the actual path of the aircraft is plotted on the photo laydown. This is accomplished by comparing film points with the photo. For any given point, the appropriate fid ucial number is placed on the photo laydown and the points joined to produce the actual flight path.

When field results are desired, anomalies are chosen and assigned appropriate fiducial numbers. The anomalies are then transferred to their correct position on the photolaydown.

6.

4) Office Reduction;

On completion of the survey, base maps are drawn using the photo laydown as a base. Flight lines and fiduc ial numbers are shown on this base map.

In the case of EM or radiometric results the anomalies are then plotted on the base map as boxes with symbols representing anomaly grade or amplitude (as noted on the legend accompanying each map). Anomaly "systems" are then outlined as conductive zones at which stage geological com parison and interpretation may be made.

In the case of magnetic results, the values noted on the Moseley chart are transcribed to a work sheet (overlay of the base map) after levelling or correcting for heading error, diurnal, etc. The values are then contoured on the work sheet and then drafted on a copy of the base map.

•B)LOO

-J

0 ,

o ^o .0-O jf

0w

00

)f :i;i-rt!i

t '

III: :

t

: .'.

i :- l "

J-^' . " ' "

-! -- -—

-l-i-h-

.L.I

' .

Ooo

u.! :

'

L j... .

J..L

IS •.::J.:-:zl-! Ir.

~ .

i ;fe

......;.i-L-:li

-i--;-..~ ,

i-....-, i.:........i............ :..::

IS -iiii.i.L:-^.:L

L^.:il;.^^

- CV

:

i—

J J -i..;.'. '-I.

fill

: - --- •..-.--.'- -iJ

--' -

-!- s'c

t.- -:

G -

G .

C GeC

! v;

i

C :i

** .

c i :

.rtC

;

C 1

t 1

.1

^vi^i'-fiv-^r-T:

. ;-

. .

. .

i -

-

i.: i.: .

.ii.].

l I.I

l i

! ,.,

J

L:.:-;i.iJ;::.!- .:-i.-i!-;..!,.

• ...i...;:

., - -r--

-H :-;; -:i

i i

-H-

i::.. -.i:;~:..:.

. .

'~

? s3 ?^ t '•: -

cIO

J+. ~-

i.,. Li

•i. -iii-!!.i

' i i-H i.! rii..-i.^ff

iji

iit

1* '" r

'•~i

iit

--4-.;-!

-Iti.'^: ±ii

L:;.t.

:

tmm

\; : ;

::;-::;J:: : v - ; i;;;;;; -p.

..j-j.;.

;-v

'^fi-;

iil-.i:

-j:-i:.iVr ti-li..

T-!.J

.

-l --.

•;Sii^

-P4-.-,

.:.j.:.-i-,M

i.l l l

.,J.. J. U

±:i-

"rt

-V{T

J

hi-;.c:.•i.. c

;-i.

... .

-.. ... i ....-

:.

: J T'

i..-. !... -; -|

;.' ,.

' .

' .

' |

. : . .:

. , .:

..: :

i i

,\ .:..( - . -i

' .. .

\ :

: . .

' '

' :.:...J

;.i i .

-.[.i i .-J.:

; :

; :

.- .i -

i ..: .

i.. ..

j. ;.i ;.....i .;.:.-j.. .:

j...; ;..!.;.;

:..: .

...'..... ;

.......-i.,...LJ... -4~-i.-i"-4--^.~~-~-;. -.^^+ -.—

—t-—

——

;•!

Mi

i.l-t:-.i

! !. i..

":-

iiii-. -C

^

——

1*~

rkii:::;::::

•-.-; .

-r~^ .

i i

i :

i :

l i W•i i

i iiiiii

J ,:..J

-. '..-.——

----

:----

~ -i-, —

--T--7.]!0

- ' -

: -

^ C

D

;.:::i CD

;::..-:ii : ! : : ;.u±.

'

i~i i "i ["""T, rr'••-•• -; i- -M-1- i :-

-; ! ' i-, if:H-l H-i-!-M- -; mi "P T i- ' ----

M ; . , , . , ,, . .. ,.:-'-:--v'--;-:-:;

' : . j . :-;.l":'. -'.: i.; .'.yj

•i ' ' ' ' ' ' S -:-; ! ' ''! :

,. , ,.. ,.;., r•!-!-^ - ! i l'

, ...r.,.,-.-!.,.r .,.........

-V-.- -,-r: '-;-i i -;-i , \ - , "ni|T-i"i vrv; i':'1 'i t '-^ ;^ j;i io o o o o o oo -.j -o o o o q o1 o OOP o o Di..oi:o

- l- '•-.',\ ~, ;- .•'•': -~": - - - ——

i . , ' : ' ;.' ' - ;. ' '

r

32333Z 3Z&333 | 325334 l 325335 325336"* ~ ~TB~ ~ "Rra" "ITS. ~ ~ TB

3253fi65 l 335364

' TB !L T B— -'r o ', * " "* 'i f/i -y i i

' ^ , 316050 , 3I8GU

3490* l 34^05

(D -TBTB c. i/- c 34909 r-V 34906

3180*2 ISIB083

1304899 li ' 319072 .3(8073 '318074" ~~ ~ "

— - 7 t li* ' ~0 " "

[ gi ' TB i TB

I Jl J| l l . t A i304300 l,,. S, Si 304300 '.3(7347 . 3I734S/ ^317343 !?B6^7^ 286 9^5 J 286974

ITB XT ~~ra - ~ ~ ~

I28TT8.2 287781 Z97^1* (J28-4— -l —"*^- '^1. — — ' i ^fa T "TB K TB ^"fe atrrR

87736 287753 1287748105139 i 303132 , 3 OILS O 12877 S3

~TB l TB

I3932l 13931 113393^NudD .f2*6937 jZ9698B

( 3567 13564 l 13561 | 6729

Irwin Twp. - M.I760

in o

ici

(Ok-iE

THE TOWNSHIP OF

DISTRICT O THUNDER BAY

THUNDER BAY MINING DIVISION

SCALE: M NCH-4O, CHAINS

LEGEND

PATENTED LANDCROWN LAND SALELEASESLOCATED lANfi""LICENSE OF OCCUPATIONMINING R IGHTS ONLYSUBFACE RIGHTS ONLYROADSIMPROVED ROADSKING'S HIGHWAYSRAILWAYSPOWER LINESMARSH OR MUSKEGMINESCANCELLED

c.s.

Loc-

M.R.O. S R O.

X c.

NOTES400 G^ffacs Rights .. Rete^'^^on

all laKes anc rivers. v"

This township lies within the - '

NIPIGON PROVINCIAL FOREST V;

PLAN N O M.1863

ONTARIO DEPARTMENT OF MINES

AND NORTHERN AFFAIRS

4-/'

00 fO10

rr;i IT

a

l

42E12NWBIW 2.669 IRWIN200

Ol O) 00

CL M M

GROUP

LEGENDm phase PP^uqdratUre ^

Oircraf-f- al'H'tude

anomoiy a nd Flight l ine,

magnetic correlation

Plight line and fiducial no.

PHELPS DODGE CORPORATION OF CANADA LTD.

AIRBORNE GEOPHYSICAL SURVEY

ELECTROMAGNETIC

PIFHER TWP , THUMPER BAY MINING DIVISION

scale : l" s 1,320'

FLOWN IN APRIL 1 971

BY GEOTE-RREX LTD.

42E!2N*ei07 2.669 IRWIN 210

KEY MAPl "s t m \.

CLA l M GROUP

UEGEND

and fiducial no.

magnetic contours Contour interval 25

PHELPS DODGE CORPORATION OF CANADA LTD.

AIRBORNE GEOPHYSICAL SURVEY

MAGNETIC

PIFHER TWP , THUNDER BAY MINING DIVISIONscale : i"^ 1,320'

FLOWN IN APRIL 1971 BY GEOT^RREX LTD.

42E12NW8107 2.669 I RWIN

CO O

.QSEH

OO)

PIFHER TWR - M.1863

O 00 CO

l Q:

o:Q

CO

T.B. Q T.B. (D T,B

T.B. 13403 MHO (D

302072 j 302071 l 3 02068

301973 [301974 [301977 | 301978 n^""^jT.B

301997 l Wurroy L

301972 l 301975 l 30I993 j 301995

67* 45' 45"

MCCOMBER TWP -M.ISOZ

NOTES

400' surface r ights reservation a long the shores of a ll lakes and rivers.

AYE OF ^

NOV l ? 1971

LP) or

LEGEND

PATENTED LAND

PATENTED FOR SURFACE RIGHTS ONLY

LEASE

LICENSE OF OCCUPATION

CROWN LAND SALES

LOCATED LAND

CANCELLED

MINING RIGHTS ONLY

SURFACE RIGHTS ONLY

HIGHWAY 4 ROUTE NO.

ROADS

TRAILS

RAILWAYS

POWER LINES

MARSH OR MUSKEG

MINES i ̂

'used only with summer resort locations or when space is limited

LO.

C.S.

Loc,C.

M.R.O.

S.R.O.

TOWNSHIP OF

RWINDISTRICT OF

THUNDER BAY

THUNDER BAYMINING DIVISION

SCALE : 1 INCH ^ 40 CHAINS (1/2 MILE)

DR. b K.

DATEPLAN NO. M. 1760

ONTARIODEPARTMENT OF MINES AND NORTHERN AFFAIRS

•42E12NW0187 2.669 IRWIN 230