Resistivity Mapping Using Inductive Sources

James MacNae; Patrick McGowan; Yves Lamontagne

doi:10.1071/EG989047

ISSN: 0812-3985
E-ISSN: 1834-7533

Resistivity Mapping Using Inductive Sources
Authors James MacNae^a, Patrick McGowan^a and Yves Lamontagne^a
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^a Lamontagne Geophysics Ltd, 24 Mowat Avenue, Toronto, Ontario, , Canada, M6K 3E8
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 20, Issue 1-2, Mar 1989, p. 47 - 50
DOI: https://doi.org/10.1071/EG989047
- Published online: 01 Mar 1989

Abstract

In electromagnetic (EM) exploration for conductive targets, measurements of the magnetic component or its time derivative have received more theoretical attention and practical application than have measurements of the electric component. However, the electric component can be shown to be particularly useful in the search for resistive zones not usually detected by the magnetic component. Normalized measurements of the surface voltage differences caused by the constant current induced at late time by the UTEM transmitter are called 'Inductive Source Resistivity' or ISR measurements.

Data collected on a grid located just south of the Temora gold mine in N.S.W. clearly show the effectiveness of the ISR technique in detecting a resistive zone of silicification located unconformably under 10S of conductive cover. Due to the relatively slow falloff of the electric field from an inductive source, the technique is ideal for the rapid exploration of large areas.

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References

Collett, L. S. and Becker A. (1968). ‘Radiohm method for earth resistivity mapping’, Canadian patent 795919, October 1968.
Lamontagne, Y. (1975). ‘Applications of wide-band time-domain EM in mineral exploration’. Ph.D. thesis, Department of Physics, University of Toronto.
Macnae, J. C. (1981). ‘Geophysical exploration with electric fields from an inductive EM source’. Ph.D. thesis, Department of Physics, University of Toronto.
Macnae, J. C, and Irvine, R. J. (1988). ‘Inductive source resistivity; a tool for outlining silicification in gold exploration’. ExplorationGeophysics (accepted).
Macnae, J. C, Groves, B., Conquer, S., and McGowan, P., (1989). ‘Inductive Source Resistivity and Induced Polarization at the Windjammer Deposit, Ontario’. Extended abstracts, SEG annualmeeting.
Pemberton, R. (1989). ‘Geophysical signatures of base metal and gold deposits’. Prospectors and Developers Annual Convention, Toronto, March 1989.
Thompson, J. F. H., Lessman, J., and Thompson, A. J. B., (1986), Temora gold-silver deposit: a newly recognized style of high sulphur mineralization in the lower Palaeozoic of Australia’, EconGeol. 81, 732-738.
West, G. F., Macnae J.C. and Lamontagne, Y. (1984). ‘A time domain electromagnetic system measuring the step response of the ground’. Geophysics,49, 1010-1026.

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Article Type: Research Article

Keyword(s): gold; inductive source resistivity; Temora; UTEM

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Resistivity Mapping Using Inductive Sources

Abstract

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