1887
Volume 31, Issue 3
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

The Hercules volcanic-hosted massive sulphide Zn-Pb-Cu-Ag-Au mineralisation in western Tasmania presents a difficult geophysical target even though it is hosted within highly resistive volcanics. The deposit is made up of a number of small, steeply dipping, ore lenses. Limited petrophysical data indicates the ore to be poorly conductive, non-magnetic, of moderate density and moderately chargeable.

Regional aeromagnetic, airborne electromagnetic and gravity surveys do not appear to identify the mineralisation. Responses from electromagnetic surveys are attributed to the overlying black shale sequence. Mineralisation has been detected from induced polarisation surveys, however, the black shale sequence is often found to be chargeable.

The Hercules deposit lies within the same alteration system as the Rosebery volcanic-hosted base-metals deposit, located approximately 7 km to the north. Mineralisation at Rosebery is contained within larger pods, is more conductive and easier to detect when the overlying black shales are thin or absent.

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2026-01-15

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References

  1. Bishop, J.R., 1989, Interpretation of Electromagnetic Surveys at the Hercules Mine: Report to Pasminco Mining, Rosebery, Pasminco Rosebery Library Number RML70.
  2. Bishop, J.R., and Emerson, D.W., 1999, Geophysical properties of zinc—bearing deposits: Austral. J. Earth Sci., 46, 311–328.
  3. Bishop, J.R., and Lewis, R.J.G., 1985, Time domain spectral IP measurements from the Rosebery mine: Expl. Geophys., 16, 175–176.
  4. Bishop, J.R., and Lewis, R.J.G., 1988, Geophysical signatures of Western Tasmanian mineralisation, Mt Read Volcanics Project Geophysical Report 9 (2 Volumes): Tasmania Department of Mines.
  5. Bishop, J.R., and Lewis, R.J.G., 1992, Geophysical signatures of Australian volcanichosted massive sulphides: Econ. Geol., 97, 913–930.
  6. Bishop, J.R., and Lutherborrow, C., 1991, Downhole electromagnetic surveys at Rosebery, Tasmania: Austral. Soc. Expl. Geophysicists-Geol. Soc. Australia Conf., Sydney, February 1991, Expanded Abstracts, 77.
  7. Burton, C.C.J., 1975, Hercules and Farrell orebodies, Rosebery district, in Knight, C.L., Ed., Economic geology of Australia and Papua New Guinea, Vol. 1 Metals: The Australasian Institute of Mining and Metallurgy, Melbourne, 626–628.
  8. Corbett, K.D. 1992, Stratigraphic-volcanic setting of massive sulfide deposits in the Cambrian Mount Read Volcanics, Tasmania: Econ.Geol., 97, 564–586.
  9. Eadie, E.T., Silic, J. and Jack, D.J., 1985, The application of geophysics to the discovery of the Hellyer ore deposit, Tasmania: Expl. Geophys., 16, 207–209.
  10. Howland-Rose, A.W., 1973a, Report on geophysical surveys over the Dallwitz, South Hercules and White Spur grids in the Rosebery Area, N.W. Tasmania, on behalf of Electrolytic Zinc Company of Australasia Limited. Pasminco Rosebery Library Number RML16.
  11. Howland-Rose, A.W., 1973b, Report on gradient and down hole electrical induced polarization surveys Hercules grid, west coast Tasmania on behalf of Electrolytic Zinc Company of Australasia Limited. Pasminco Rosebery Library Number RML18.
  12. Leaman, D.E., 1988, Implications of gravity and magnetic data Rosebery Mine Leases, west Tasmania. Report to EZ, Pasminco Rosebery Library Number RML63.
  13. Lees, T., Khin Zaw, Large, R.R. and Huston, D.L., 1990, Rosebery and Hercules copper-lead-zinc deposits, in Hughes, F.E., Ed., Geology of the mineral deposits of Australia and Papua New Guinea: The Australasian Institute of Mining and Metallurgy, Melbourne, 1241–1247.
  14. Lorrigan, A.N., 1989, Brief review of geophysical methods used in the Rosebery area. Report to Pasminco Exploration, Pasminco Rosebery Library Number RML72.
  15. MacInnes, S., 1996, S2DIP documentation. Smooth-model resistivity and IP inversion. Zonge Engineering & Research Organistation, Inc.
  16. Murphy, F.C., 1995, Hercules helimag interpretation. Internal memorandum to Pasminco Exploration.
  17. Webster, S.S, and Skey, E.H., 1979, Geophysical and geochemical case history of the Que River deposit, Tasmania, Australia, in Hood, P.J., Ed., Geophysics and geochemistry in the search for metallic ores: Geological Survey of Canada, Economic Geology Report 31, 697–720.
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  • Article Type: Research Article
Keyword(s): Aeromagnetic; black shales; electromagnetic; Hercules; induced polarisation; lead petrophysics; Rosebery; Tasmania; VHMS; zinc

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