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Controls on gold and silver grades in volcanogenic sulphide deposits (84/P210) AMIRA Project. Final Research Report, August 1988


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Large, RR, Zaw, K, Jenkins, GW, McGoldrick, PJ, Huston, DL, Stoltz, J and McArthur, GJ 1988 , Controls on gold and silver grades in volcanogenic sulphide deposits (84/P210) AMIRA Project. Final Research Report, August 1988.

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Restatement of Aims
To investigate the geological and geochemical controls on the distribution of precious metals within volcanic hosted massive sulphide deposits, with the objective of developing exploration models useful for the discovery of further precious metal-rich deposits.

Progress 1985-1988
This is the fourth and final report on the results of this research project. Our progress and results this year have been very satisfying and I can confidently report that we have achieved the aims and objectives outlined in our original proposal at the commencement of this project in 1985. During the three years of this research program we have made major advances in our understanding of the controls on precious metals in volcanogenic hydrothermal systems, which have application in the future exploration and mining of volcanogenic gold, silver and base metal deposits.

In particular, the following has been achieved:
1. Detailed documentation of the geology, mineralogy and zonation of precious metals within a number of Australian massive sulphide deposits (Rosebery, Que River and Hercules in Tasmania, Balcooma and Mt. Chalmers in Queensland, and Scuddles and Teutonic Bore in Western Australia) has led to the recognition of two major gold
associations; the Au-Zn (-Pb-Ag-ba) association and the Au-Cu association. Compilation of a tonnage-grade data base for similar precious metal-rich volcanogenic deposits in Japan and the Canadian Archean has confirmed these two
2. Research into the chemistry of gold transport and
deposition has led to the development of a geologic-thermodynamic model which can account for (and predict) the concentration and location of gold within volcanogenic systems under a variety of hydrothermal solution conditions. This model has major implications for gold transport and deposition in other geological environments (eg. epithermal or porphyry systems).
3. Geochemical studies of the Cambrian volcanics which comprise the Mt. Read Volcanic archave increased our understanding of the volcanic processes involved, their relationship to the tectonic setting and the interplay between volcanic processes, hydrothermal processes, alteration and mineralisation.
4. Research into the primary gold content of the Cambrian volcanics and sediments of western Tasmania has identified the probable source rocks for gold. This work has significant exploration implications.
5. A series of exploration models for gold-bearing
volcanogenic deposits have been developed which facilitate the transfer of research technology developed in this program to mining company sponsors.

Item Type: Report (Technical Report)
Authors/Creators:Large, RR and Zaw, K and Jenkins, GW and McGoldrick, PJ and Huston, DL and Stoltz, J and McArthur, GJ
Publisher: University of Tasmania
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