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© Ministry of Mines and

Northern Development Minerals Ontario Mines Division

ONTARIO G E O L O G I C A L SURVEY G E O P H Y S I C A L / G E O C H E M I C A L SERIES

M A P 81220

DETOUR—BURNTBUSH—ABITIBI A R E A

Airborne Electromagnetic Survey Total Intensity Magnetic Survey |

DISTRICT OF COCHRANE P M

Scale 1;20 000 ^

mBlres500 3 1 kilometre ^

mile 1/4 C 1/2 mile

NTS References 42A/15 42H/2 ODM-GSC Aeromagnetic Maps: 2337G 2338G ODM Geological Compilation Maps: 2161 2205

1989 Queen's Printer for Ontario. Printed in Ontario, Canada

61° 30' 80' 30'

' 1 — T ™ ™ e n — I 0 5 lU '5 M ^5 30 35 K m A ' ^ . j . . ; ^ CO J ,

B°° 3,. \ , V, ' , r^J-tC^?^ ,KA V

I I L COCHRANE^ • aigj- '̂̂ P

L O C A T I O N MAP l ^ ^ ^ ^ g ^ ' I '̂ ^ I I 1 ̂ -̂ "LVi " ^ ^ . J - ^ - ' . l l ^ ^ : ^

30' 80" 30-

GEOTEM® Peak Response Symbols A N O M A L Y D E C A Y I N T E R V A L C L A S S I F I C A T I O N ApparentConcH;ciance

. Anomaly Letter (Siemens) 1-2 Channel (350,450 micraaeconda) B | 7

I - 9 -- O - 3-4 Channel {550,670 microseconds) interpreted as ' '

a possible • Ch. 6 Amplitude (ppm) 5-8 Channel (790.910 microseconds) overburden /

I Response / " S - 7-8 Channel (1050.1190 microseconds) ^vt^o*

I Source not X. Clear

9-10 Channel (1350,1510 microseconds) I I _^ ^ . . Culture Response

-0- 11-12 Channel (1680,1870 microseconds)

' Aromaly Letter

Magnetic Contours ^ 10 Gamma Contour Line Mots; Responses clearly identifiable as 50 G a m m a C o n t o u r L i n e o v a r b u r d o n a rc not rep resen ted on

250 Gamma Contour Line this map. Mean magnetometer sensor altitude 120 metres

^ " " ^ v . Mean electromagnetic sensor altitude 40 metres J) Magnetic Depression Mean f l iqht line spacing 200 metres

^ K, ~rT*7\. H ̂ Fl ight l ines 250 N r 1 Nanolesia (nT) - 1 Gamma

Representative GEOTEM®, Conductance Nomogram Magnetometer and Altimeter Profile ( ve r t i ca l eoomxsoom p la te i 2 0 m b e i o w a / c )

•• \ -^ : ' ; ! • ! • h ; : ' : ' T 'POOlir 1 1—i rn 1 F 1—, m-i

!-.::::-: A L " "i:;-!-:'..:!..;iS::' 2,.dVert.ca- -^^ ^

i j ^ i / ^ ^ I / / / / / / T s ' « — ] ~ ! — f - ^ - ^ '

I I 1 ^''y'' I '^•^X^^^^nomaiy Location. I I

"-m— -^iA—I—444—-^'y'"^-'^ .ol n l\ ul\ I \ I 11111,1 ' T T T S O M I O O

§ FiOjcial Iiniing Mai" 5 ^ C T P iSieirarib)

DESCRIPTIVE N O T E S

The aircraft (C-G iLU) is equipped with the Geoterrex G E O T E M * airborre EM system, a Scintrex single cell, split beam cesium vapour magnetonnsler, and a MADACS digitai data acquisitior system. GEOTEM® is a digital high power time-domain EM system with a peak moment ol 4.5 x 10̂ Am^. Current waveform is a half sine wave with a pulse duration of 1050 microseconds and a repetition rate of 300 pulses per second. The fionzonlal axis receiver coil is nominally '07 metres twhina ana H U metres L>elOW the vertical axis transmitter loop

Tne quantitative interpretation of the G E O T E M « data is accomplished by comparing the resultant EM responses witti type-curves Obtained from mathematical model studies. Ttie channel amplitude ratios of a response are mamly a function of the conductance of its source Ttie response magnitude varies with conductor depth and geometry. The reference nomogram for the survey is a vertical plate, proauced from a tnm sneei model wiin 600 tn aiiike length and 300 m deptti extent, looptod at ground surface

Ttie GEOTEM® System will respond to conductive overburden, near-surlace horizontal conducting layers, cultural sources and bedrock conduotore. Discriminalion ol riatural conductors based on the rate of transient decay, magnetic Correlation and the response shape, together with the response pattern and topograpny. Cultural responses are identifiable by examining the power line monitor and the flight track film to locate cultural sources. The aeromagnetic total field contours were generated from digitally recorded data with sampling intervals ot 1 0 second. The magnetic data were: (1) corrected tor diurnal variations by subtraction of the digitally recorded base stalian magnetic Oata, (ii) levelled to the tie line data, (iii) interpolated onto a regular 0.25 cm grid, at the map scale ol 1:20 000, using a modified Akima'^J technique. No correction has been made lor regional variation of ttie earth's magnetic fielO.

©Registered Trade Mark of Geoterrex Limited CREDITS

Mosaic preparation, data compilation and drafting were done by Geoterrex Limited, Ottawa. Ontario, from March to December 1986. Tl iH rriosdii; was prepared using Ontario Mini airy of Natural Resources 1:15 34Q air photographs, which were f^antrolled to 1:50 000 topographic maps publistieb by Energy, Mines and Resources. Ottawa. Electromagnetic data and magnetic contours were plotted by Geoterrfex Limited. Ottawa. Ontario,

Ref. (1): Akima. H , 1970, A new method of interpolation and Smooth Curve Fitting based on local procedures. J , ACM. 17, No. 4, p. 589-602.

Tnis map is publlsneU wl l l i Uie p K i i i i i a s m n uf V . Q . Milne, Director, Ontario Geological S u r v e y .

Magnetic declination m the area was approximately 12° 10'W in March 1988.

Every possible effort has been made to ensure the accuracy of the information presented on this map, however, the Ontario Ministry of Northern Development and Mines does not assume any liability tor errors that occur. Users may wissri |y verily iiie Udia profiles on file for a limited time at the Resident or Regional Geologist's office nearest the map area

Fir^ancial assistance for this project was provided through the Northern Development Fund.

Issued 1989

Information from this publication may be quoted il credit is given. It is recommended that reference be made in the tollowmg torm

ONTARIO G E O L O G I C A L SURVEY

1989 Airborne Electromagnetic and Total Intensity Survey, Detour—Burntbush—Abitibi Area, Fox, Stimson Township, District of Cochrane, Ontarpn; hy fi(>nt#trrRx Limited, lor the Ontario Geological Survey, Geophysical/Geochemical Series, Map 81220 Scale 1:20 000. Survey and compilation Irom March to December 19B8.

N O T E : A set of 1:31.680 scale maps showing topography. Ilight lines and electromagnetic results accompanies this set of maps and is available free of charge with the purchase ol this set of maps.

NOTE: R e s p o n s e s clearly identifiable a s o v e r b u r d e n are not represented o n this m a p .