Applications of Downhole SIROTEM Surveys in the Agnew Nickel Belt, WA

Andrew J. Mutton

doi:10.1071/EG987295

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

Applications of Downhole SIROTEM Surveys in the Agnew Nickel Belt, WA
Authors Andrew J. Mutton^a
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^a Formerly BP Minerals Aust.Presently CRA Exploration Pty Ltd, PO Box 238 Westend, , Qld, 4101, Australia
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 18, Issue 3, Jun 1987, p. 295 - 303
DOI: https://doi.org/10.1071/EG987295
- Published online: 01 Jun 1987

Abstract

Field examples of downhole SIROTEM surveys investigating massive sulphide targets in the Agnew Nickel Belt, WA are presented to highlight different applications of the technique. The examples show that the downhole EM (DHEM) method can successfully solve specific exploration problems posed by initial drilling of a prospect. Such problems include: the presence or absence of deep conductors in favourable geological positions; the location or confirmation of the source of a surface EM response; the resolution of the geometry and extent of a drilled conductive target; and the effect of conductive overburden on surface and downhole EM responses. Interpretation of the Agnew DHEM survey data, based on computer forward modelling aids, shows good agreement with drill indicated conductor positions. The results demonstrate that the DHEM method represents an efficient and cost-effective means for second phase exploration for massive sulphide targets.

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1987-06-01

2026-01-14

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References

Boyd, G. W. & Wiles, C. J. (1984)—‘The Newmont drill-hole EMP system — Examples from Eastern Australia’, Geophysics49, 949_956.
Buselli, G. & O’ Neill, B. O. (1977)—‘SIROTEM: A new portable instrument for multichannel transient electromagnetic measurements’, Bull. Aust. Soc. Explor. Geophys.8, 82-87.
CSIRO (1984)—‘Program OZPLTE User Manual’, Division of Mineral Physics, Sydney.
Dyck, A. V. (1981)—‘A method for quantitative interpretation of wideband, drill-hole EM surveys in mineral exploration’, Ph.D. thesis, Univ. of Toronto; available as Research in Applied Geophysics, no. 23, Geophysics Lab., Dept. of Physics.
Dyck, A. V, Bloore, M. & Vallee, M. A. (1981)—‘User manual for program PLATE and SPHERE’ Research in Applied Geophysics, no. 14, Geophysics Lab., Dept. of Physics, Univ. of Toronto.
Dyck, A. V. & West, G. F. (1984)—‘The role of simple computer models in interpretations of wide-band, drill-hole electromagnetic surveys in mineral exploration’, Geophysics49, 957-980.
Marston, P. (1984)—‘Nickel mineralisation in Western Australia’, Geol. Survey of W.A. Mineral Resources Bulletin 14.
Martin, J. E. & Allchurch, P. D. (1975)—‘Perserverence nickel deposit’, Agnew: in Knight C. L. (ed) Econ. Geol. of Aust. and Papua New Guinea, 1. Metals; Aust. Inst. of Mining & Metallurgy Monograph no. 5, pp. 159-155.
Woods, D. V. (1975)—‘A model study of the Crone borehole pulse electromagnetic (PEM) system’, M.Sc. thesis, Queen’s University, Kingston, Ont.

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Article Type: Research Article

Keyword(s): Agnew nickel belt; computer modelling; downhole EM; multiple conductors; nickel sulphides; SIROTEM

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Applications of Downhole SIROTEM Surveys in the Agnew Nickel Belt, WA

Abstract

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