A Sub-Audio Magnetics case study: Flying Doctor Pb-Zn-Ag Deposit, Broken Hill, Australia

Malcolm Cattach; David Boggs

doi:10.1071/EG05119

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

A Sub-Audio Magnetics case study: Flying Doctor Pb-Zn-Ag Deposit, Broken Hill, Australia
Authors Malcolm Cattach^a and David Boggs^b
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^a Geophysical Technology Limited, 3/10 Hudson Road Albion p4010, Qld, Australia, Phone: +61 7 3862 2588, Facsimile: +61 7 3862 3418, Email: [email protected] ^b BHP Billiton 38 Aminya Crescent Yallambie 3085, Vic Australia
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 36, Issue 2, Jun 2005, p. 119 - 124
DOI: https://doi.org/10.1071/EG05119
- Received: 05 Feb 2005
- Accepted: 13 Apr 2005
- Published online: 01 Jun 2005

Abstract

The Flying Doctor Deposit is located approximately 5 km north-east of Broken Hill, NSW. The area lies along strike from the main Broken Hill ore bodies and is considered highly prospective for the development of base-metal sulphide mineralisation. The deposit was originally detected by induced polarization profiling techniques. Subsequent drilling in 1965 led to the discovery of a massive sulphide body. Over the last 20 years, comprehensive geological and geophysical data have been acquired at the site and consequently, the Flying Doctor Deposit has become an important test site for the evaluation of new geophysical techniques in the Broken Hill region.

One of the first Sub-Audio Magnetics (SAM) trials was conducted at the Flying Doctor deposit in late 1992 to test the feasibility of acquiring total field magnetometric resistivity (TFMMR) data simultaneously with high definition total magnetic intensity (TMI) da a. Subsequent trials in 1995 focussed on acquiring total field magnetometric induced polarization (TFMMIP) and total field electromagnetic (TFEM) parameters. It was found that the Flying Doctor Deposit exhibited no magnetic susceptibility contrast but that the mineralisation was readily detected by both the TFMMR and TFMMIP parameters. This paper describes the results of the TFMMR/TFMMIP surveys and compares them with results obtained with prior surveys including gradient-array induced polarization (IP), dipole-dipole array induced polarization and magnetic induced polarization (MIP) surveys.

The SAM trials demonstrated that it is possible to map several geophysical properties simultaneously with a single instrument, and confirmed that SAM is capable of acquiring data cost-effectively at spatial resolutions equivalent to high definition magnetics. An important conclusion from the surveys was that much greater interpretative power can be derived from having multiple data sets which reflect independent physical properties.

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References

Bishop, J.R., 1989, An Evaluation of Geophysical Test Surveys over the Flying Doctor Prospect, Broken Hill: Unpublished report commissioned by Pasminco Mining Ltd.
Boggs, D.B., 1999, The theory and application of sub-audio magnetic data acquisition and numeric modelling: Ph.D. thesis (unpublished), University of New England.
Cattach, M.K., Stanley, J.M., Lee, S.J., and Boyd, G.W., 1993, Sub-audio magnetics (SAM) – a high resolution technique for simultaneously mapping electrical and magnetic properties: Exploration Geophysics, 24, 387–400.
Cattach, M.K., 1996, Sub-audio magnetics (SAM) – A high resolution geophysical technique for simultaneously mapping electrical and magnetic properties of the earth: Ph.D. thesis (unpublished), University of New England.
Howland-Rose, A.W., 1978, A progress report on rapid reconnaissance magnetic induced polarization surveys over exploration leases at Broken Hill, New South Wales: Unpublished report on behalf of Amdex Mining Limited. Phase I - E.L. 744. Scintrex Research Report.
Larsen, D.H., 1993, Flying Doctor Geological Plan: Unpublished map provided by Pasminco Mining Ltd.
Stevens, B.P.J., Stroud, W.J., Willis, I.L., Brown, R.E., Bradley, G.M., and Barnes, R.G., 1980, A Stratigraphic interpretation of the Broken Hill Block: Records of the Geological Survey of N.S.W., 20, 9–32.
Tyne, E.D., 1987, The development of a computer controlled system for continuous IP logging and spectral IP measurements in exploration drillholes: Ph.D. thesis (unpublished), University of NSW.
Widdop, W.G., Leyh, W.R., and Larsen, D.F., 1983, Summary of exploration. Northern leases - Joint Venture: North Broken Hill Ltd., Unpublished report 121/291.

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Article Type: Research Article

Keyword(s): Broken Hill; Flying Doctor; SAM; Sub-Audio Magnetics

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A Sub-Audio Magnetics case study: Flying Doctor Pb-Zn-Ag Deposit, Broken Hill, Australia

Abstract

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