1887
ASEG2013 - 23rd Geophysical Conference
  • ISSN: 2202-0586
  • E-ISSN:

Abstract

The anticipated almost doubling of world mine Cu production by 2030 will require a substantially increased output from existing porphyry Cu mines, along with production from as yet undeveloped mines and the discovery of new porphyry ore bodies. Assisting the potential for increased output from existing and new mines, and partly in response to declining ore grade, mass (large-scale) mining of porphyry Cu ore bodies is undergoing a major transformation, foreshadowing a significant increase in the size of some existing and future mining operations.

The discovery histories of two of the four Cadia, porphyry Au-Cu ore bodies in New South Wales, Australia offer insights into discovering deeper porphyry ore bodies. Induced polarisation geophysics (IP) contributed importantly to one of these discoveries (Ridgeway) by identifying the overlying ‘sulphur’ halo to the ore body.

It is proposed that IP, and possibly other geophysical methods, can play a greater role in discovering deeply- located porphyry ore bodies, when used as part of an ‘ore-system’ approach to discovery; particularly if the methods can be modified so as to ‘see’ much deeper than at present and used to identify a porphyry ‘sulphur’ halo, starting at a depth below surface of up to 1,000 m.

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2013-12-01
2026-01-13
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References

  1. Baker, M.J., Cooke, D.R., Hollings, P.N., Wilkinson, J.J. and Wilkinson, C., 2012, Epidote trace element chemistry as an exploration tool: El Teniente porphyry Cu-Mo deposit case study: SEG 2012 Conference, Integrated Exploration and Ore deposits, Society of Economic Geologists, Lima, Peru, September 23-26, 2012, Abstracts.
  2. Burnham, C.W., 1979, Magmas and hydrothermal fluids, in: H.L. Barnes, ed., Geochemistry of Hydrothermal Ore Deposits: 2nd edition: J. Wiley and Sons, 71-136.
  3. Candela, P.A., 1991, Physics of aqueous phase exsolution in plutonic environments: American Mineralogist, 76, 1081-1091.
  4. Chitombo, G., 2011, Total Deposit Knowledge - Geology, Underground Mass Mining and the Future - A Mining Engineer’s Perspective: Eighth International Mining Geology Conference, Queenstown, New Zealand, 22-24 August 2011, Proceedings, 11-14.
  5. Close, D.I., 2001, A geophysical study of the Ridgeway Gold- Copper Deposit, New South Wales: B.Sc. Honours thesis, University of Tasmania.
  6. Dillies, J.H. and Einaudi, M.T., 1992, Wall-rock alteration and hydrothermal flow paths about the Ann-Mason porphyry Cu deposit, Nevada - a 6 km vertical reconstruction: Economic Geology, 87, 1963-2001.
  7. Gustafson, L.B. and Hunt, J.P., 1975, The porphyry copper deposit at El Savador, Chile: Economic Geology, 70, 857-912.
  8. Gustafson, L.B. and Titley, S.R., 1978, Porphyry Copper Deposits of the Southwestern pacific islands and Australia: Economic Geology, 73, 597-599.
  9. Henley, R.W. and McNabb, A., 1978, Magmatic vapour plumes and ground-water interaction in porphyry copper emplacement: Economic Geology, 73, 1-20.
  10. Holliday, J., McMillan, C. and Tedder, I., 1999, Discovery of the Cadia Ridgeway gold-copper deposit: New Generation Gold Mines - case histories of discovery, Perth, Australian Mineral Foundation, 101-107.
  11. Kirwin, D.J., Forster, C.N., and Garamjav, D., 2003, The discovery history of the Oyu Tolgoi porphyry copper-gold deposits, SouthGobi, Mongolia: NewGenGold 2003 Conference Proceedings, 130-146.
  12. Lang, J.R., Stanley, C.R., Thompson, J.F.H. and Dunne, K.P.E., 1995, Na-K-Ca magmatic-hydrothermal alteration in alkali porphyry Cu-Au deposits, British Columbia: Mineralogical Association of Canada Shortcourse, 23, 336- 339.
  13. Lowell, J.D. and Guilbert, J.M., 1970, Lateral and vertical alteration-mineralisation zoning in porphyry ore deposits: Economic Geology, 65, 373-407.
  14. McKinstry, H.E., 1948: Mining Geology, Prentice-Hall Inc., Englewood Cliffs, New Jersey.
  15. MEG, 2011, Strategies for Copper Reserves Replacement: The Costs of Finding and Acquiring Copper: Metals Economics Group.
  16. Rivera, S.L., Cuadra, P. And Wettke, E., 2012, Discovery and Geology of La Americana and Cerro Negro: new deep porphyry Cu-Mo type mineralisation at Andina Mine, Rio Blanco-Los Bronces District, Central Chile: SEG 2012 Conference, Integrated Exploration and Ore Deposits, Lima Peru, September 23-26, 2012, Abstracts.
  17. Sillitoe, R.H., 1995, ed., Exploration and discovery of base and precious metal deposits in the circum-Pacific region during the last 25 years: Resource Geology Special Issue, 19. Sillitoe, R.H., 2000, ed., Exploration and discovery of base and precious metal deposits in the circum-Pacific region - a late 1990’s update: Resource Geology Special Issue, 21. Sillitoe, R.H., and Thompson, J.F.H., 2006, Changes in mineral exploration practice: consequences for discovery: Society of Economic Geologists Special Publication, 12, 193- 219.
  18. Sillitoe, R.H., 2012, Porphyry Copper Provinces: SEG 2012 Conference, Integrated Exploration and Ore Deposits, Society of Economic Geologists, Lima, Peru, September 23-26, 2012, Abstracts.
  19. Schroeter, T.G., ed., 1995, Porphyry deposits of the Northwestern Cordillera of North America: Canadian Institute of Mining and Metallurgy Special Volume, 46.
  20. Sheppard, S.M.F., Neilsen, R.L. and Taylor Jr, H.P., 1971, Hydrogen and oxygen isotope ratios in minerals from porphyry copper deposits: Economic Geology, 66, 515-542. Sutherland-Brown, A., 1976, ed., Porphyry deposits of the Canadian Cordillera: Canadian Institute of Mining and Metallurgy Special Volume, 15, 510 p.
  21. Sutulov, A., 1975, Copper Porphyries: Miller Freeman Publications, Inc.
  22. Taylor, H.P., Jr., 1974, The application of oxygen and hydrogen isotope studies to problems of hydrothermal alteration and ore deposition: Economic Geology, 69, 843- 883.
  23. Tedder, I.J., Holliday, J. and Hayward, S., 2001, Discovery and evaluation drilling of the Cadia Far East gold-copper deposit: NewGen Gold 2001 - Case Histories of Discovery, Australian Mineral Foundation, 171-184.
  24. Titley, S.R., 1982, ed., Advances in geology of the porphyry copper deposits Southwestern North America: University of Arizona Press, Tucson, Arizona.
  25. Wilson, A.J., Cooke, D.R. and Harper, B.L., 2003, The Ridgeway gold-copper deposit: a high-grade alkali porphyry deposit in the Lachlan Fold Belt, NSW, Australia: Economic Geology, 98, 1637-1666.
  26. Wood, D., 2010, Mineral resource Discovery - Science, Art & Business: SEG Newsletter, January 2010, 12-17.
  27. Wood, D., 2012a, Discovery of the Cadia Deposits, NSW, Australia (Part 1): SEG Newsletter, January 2012, 1, 13-18.
  28. Wood, D., 2012b, Discovery of the Cadia Deposits, NSW, Australia (Part 2): SEG Newsletter, April 2012, 1, 17-22. Wood, D. G. and Holliday, J.R., 1995, Discovery of the Cadia gold-copper deposit in New South Wales by refocusing the results of previous work: New Generation Gold Mines Case Histories of Discoveries Conference Proceedings, Australian Mineral Foundation, South Australia.
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  • Article Type: Research Article
Keyword(s): Cadia; copper; geophysics; IP; porphyry
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