Down-Hole Electromagnetic Surveys at Renison Bell, Tasmania

J. R. Bishop; R. J. G. Lewis; J. C. Macnae

doi:10.1071/EG987265

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

Down-Hole Electromagnetic Surveys at Renison Bell, Tasmania
Authors J. R. Bishop^a, R. J. G. Lewis^b and J. C. Macnae^c
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^a Mitre Geophysics Pty Ltd, Buggs Lane, Elliott, Tasmania, 7325 ^b University of Tasmania, Sandy Bay, Hobart, , Tasmania, 7005 ^c Lamontagne Geophysics (Australia) Pty Ltd, 102 Glover St Cremorne, , NSW, 2090
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 18, Issue 3, Jun 1987, p. 265 - 277
DOI: https://doi.org/10.1071/EG987265
- Published online: 01 Jun 1987

Abstract

Down-hole electromagnetic surveys have been used in the vicinity of the Renison mine to explore for further lodes of cassiterite-bearing pyrrhotite at depths approaching 1 km. Surveys down one hole have located a significant off-hole conductor. A simple current filament model does not adequately describe the behaviour of the response from this conductor. The effects of other conductors above and about the target body are suggested as possible causes for the complexity in the data. They may also be responsible for the first of two changes of sign with time.

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1987-06-01

2026-01-16

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References

Asten, M. W., King, A. and Peacock, J. (1987)—‘Sign changes in DHEM surveys for cindered coal in the Sydney Basin’, ExplorationGeophysics, this volume.
Dufty, M. (1984)—‘Geological log of DDH S1182’. Unpublished Renison Ltd company record.
Gallagher, P. R., Ward, S. H. and Hohmann, G. (1985)—‘ model study of a thin plate in free space for the EM37 transient EM system’, Geophysics 50, 1002-1019.
Howland-Rose, A. W. (1972)—‘Report on conductivity, susceptibility, chargeability and resistivity tests on diamond drill core’. Unpublished Scintrex report for Renison Ltd.
Lewis, R. J. G. and Lee, T. J. (1984)—‘The detection of induced polarization with a transient electromagnetic system,’ IEEE trans.GE-22; 1, 69-80.
Macnae, J. C. (1980)—‘An atlas of primary fields due to fixed transmitter loop EM sources’, University of Toronto, Research in Applied Geophysics No. 13.
Macnae, J. C. (1985)—‘Manual of large loop EM interpretation,’ Lamontagne Geophysics.
Macnae, J. C, and Staitari, G. (1987)—‘Classification of sign changes in borehole TEM decays,’ Exploration Geophysics, this volume.
Macnae, J. C. and Lamontagne, Y, (1983)—‘interpretation of conductor complexity in bore-hole EM data’. Proc. of borehole symposium,’ Geol. Survey of Canada.
Morland, R. (1986)—‘Renison Bell tin mine; technical review’. Unpublished Renison Ltd company report.
Newnham, L. A. (1975)—‘Renison Bell tin field’. AIMM monograph No. 5:1, 581-583.
Woods, D. V. (1975)—‘A model study of the Crone borehole PEM system’. MSc thesis, Queen’s University, Ontario.

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Article Type: Research Article

Keyword(s): computer modelling; down-hole electromagnetics; EM37; pyrrhotite; Renison Bell; Sirotem; Tasmania; tin

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Down-Hole Electromagnetic Surveys at Renison Bell, Tasmania

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