1887
2nd Australasian Exploration Geoscience Conference: Data to Discovery
  • ISSN: 2202-0586
  • E-ISSN:

Abstract

Summary

Porphyry deposits of the circum-Pacific region contain a large amount of the world’s copper, molybdenum and gold. These deposits are formed from calc-alkaline and potassic magmas characterized by varying oxidation states (O2), which contribute to different ore mineral assemblages and contrasting relationships to hydrothermal alteration zones. Gold-rich porphyry copper deposits are typically characterized by hydrous and highly oxidized causal magmas. Variations in the styles of geology and mineralization contribute to differing geochemical expressions and geophysical signatures of the porphyry deposits. Exploration programs that integrate high-quality geological mapping and drill-core logging with a three-dimensional understanding of geochemical and geophysical data will facilitate the path to discovery.

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/content/journals/10.1080/22020586.2019.12073248
2019-12-01
2026-01-19
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References

  1. Brimhall, G.H., Dilles, J.H., and Proffett, J.M, 2006, The role of geologic mapping in mineral exploration: Society of Economic Geologists Special Publication 12, p. 221-241.
  2. Cohen, J.F., 2011, Mineralogy and geochemistry of alteration at the Ann-Mason copper deposit, Nevada: Comparison of large-scale ore exploration techniques to mineral chemistry: M.Sc. thesis, Corvallis, Oregon, Oregon State University, 112 p. plus appendices.
  3. Einaudi, M.T., 1996, Mapping altered and mineralized rocks: An introduction to the Anaconda method, unpublished manual, Department of Geological and Environmental Sciences, Stanford University, California, 20 p.
  4. Einaudi, M. T., Hedenquist J. W., and Inan, E. E., 2003, Sulfidation state of fluids in active and extinct hydrothermal systems: Transitions from porphyry to epithermal environments, in Simmons, S. F., and Graham, I., eds., Giggenbach Volume, Special Publication 10, Society of Economic Geologists and Geochemical Society, p. 285-314.
  5. Garwin, S., 2002, The geologic setting of intrusion-related hydrothermal systems near the Batu Hijau porphyry copper-gold deposit, Sumbawa, Indonesia, in Goldfarb, R. J. and Nielsen, R. (eds.), Integrated Methods for Discovery, Society of Economic Geologists Special Publication No. 9, p. 333-366.
  6. Garwin, S., 2018, The importance of geological mapping, core-logging and 3D geoscientific data integration in the exploration of porphyry copper-(gold) deposits, in Verncombe, J. (editor), Extended abstracts for Gold18@Perth, Australian Institute of Geoscientists Symposium organized in conjunction with Geoscientists Symposia, Perth, Western Australia, 2 – 3 August 2018, Bulletin No. 68 – 2018, p. 21-25.
  7. Garwin, S., 2019, The regional controls, geology, geochemical signature and geophysical expression of porphyry copper-(gold) systems, post-conference workshop to PACRIM 2019, Auckland, New Zealand, 6th April 2019, 330 slides.
  8. Gustafson, L.B., and Hunt, J.P., 1975, The porphyry copper deposit at El Salvador, Chile: Economic Geology, v. 70, 857-912.
  9. Halley, S., Dilles, J.H, and Tosdal, R.M., 2015, Footprints: Hydrothermal alteration and geochemical dispersion around porphyry copper deposits, Society of Economic Geologists Newsletter v. 100, p 1, 12-17.
  10. Hoschke, T.G., 2011, Geophysical signatures of copper-gold porphyry and epithermal gold deposits, and implications for exploration, Centre of Excellences in Ore Deposits (CODES), University of Tasmania, 47 p.
  11. Loucks, R., 2014, Distinctive composition of copper-ore-forming arc magmas: Centre for Exploration Targeting, School of Earth and Environment, University of Western Australia, Crawley, WA 6009, Australia, 5-16.
  12. Müller, D., and Groves, D. I., 2019, Potassic igneous rocks and associated gold-copper mineralization, fifth edition. Mineral resource reviews, Springer, 398 p.
/content/journals/10.1080/22020586.2019.12073248
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  • Article Type: Research Article
Keyword(s): geochemistry; geology; geophysics; porphyry copper-gold
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