A Cross-Gallery Tomographic Survey in the New England Antimony Mine (Hillgrove, N.S.W.): A Case Study in a Hard Rock Environment

P. Zhao; G. Bock; F. Wenzel

doi:10.1071/EG994197

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

A Cross-Gallery Tomographic Survey in the New England Antimony Mine (Hillgrove, N.S.W.): A Case Study in a Hard Rock Environment
Authors P. Zhao^a, G. Bock^b and F. Wenzel^c
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^a School of Earth Sciences, Macquarie University, , North Ryde, , NSW, 2109 ^b Department of Geology and Geophysics, University of New England, , Armidale, , NSW, 2351 ^c School of Earth Sciences, Macquarie University, , North Ryde, , NSW, 2109, Division of Exploration Geoscience, CSIRO, \ P.O. Box, North Ryde, , NSW, 2112
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 25, Issue 4, Dec 1994, p. 197 - 205
DOI: https://doi.org/10.1071/EG994197
- Published online: 01 Dec 1994

Abstract

The aim of a cross-gallery seismic experiment in the Hillgrove Antimony-Gold Mine (New South Wales) was to find out whether variations in seismic velocities could be related to a known shear zone containing mineralised gold. A further objective was to test simple means of S-wave generation and recording. Using the impact of a 4.5 kg sledge hammer as seismic source, seismic signals containing frequencies above 500 Hz could be produced. P-waves were best recorded on horizontal-component geophones for horizontal impact. Most P- wave onset could be picked with a precision of 0.1 milliseconds. S-waves showed best up on vertical-component recordings of vertical impact shots. However, their onset cannot be easily picked with the same precision as those of P- waves. The resulting P-wave tomogram indicates significant velocity variations. That a straight correlation with the known geology is not possible indicates that the zone of mineralisation is too narrow to be resolved by our experiment.

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References

Aki, K., and Richards, P. G. (1980), ‘Quantitative Seismology Theory and Methods, Vol. 1.’ Freeman and Co., San Francisco.
Boyle, G. O. and Hill, R. L. (1988). ‘The Hillgrove Antimony Gold Field.’ In: J.D. Kleeman (editor): The New England Orogen - Tectonics and Metallogenesis, 235–239, University of New England, Armidale.
Duncan, G., Downey, M., Leung, L. and Harman, P. (1989). ‘The development of cross hole seismic techniques and case studies.’ Explor. Geophys., 127–130.
Harman, P, Leung, L., and Downey, M. (1987). ‘Cross-hole seismic survey for mineral exploration in the West Kimberley area, western Australia.’ Explor. Geophys., 80–83.
Tarantola, A. (1987). ‘Inverse Problem Theory.’ Elsevier, Amsterdam.
Helbig K. (1987). ‘Shear-waves what they are and how they can be used.’ Geophysical Development, 1, 19–36. Leung, L., Downey, M., and Harman, P. (1988). ‘Cross-hole seismic tomography for mineral exploration and mine planning.’ 58th annual international meeting, SEG expanded abstracts. ENG 2.7.
Ivansson, S. (1987). ‘Crosshole transmission tomography.’ In: G. Nolet (editor): Seismic tomography with applications in global seismology and exploration geophysics, pp. 159–188, D. Reidel Publishing Company, Dordrecht.

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Article Type: Research Article

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A Cross-Gallery Tomographic Survey in the New England Antimony Mine (Hillgrove, N.S.W.): A Case Study in a Hard Rock Environment

Abstract

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