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Controls on gold and silver grades in volcanogenic sulphide deposits (84/P210) AMIRA Progress Report, April 1986


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Large, RR, McGoldrick, PJ, Gordon, I, Hunns, SR, Ruxton, P, Huston, DL and Crawford, AJ 1986 , Controls on gold and silver grades in volcanogenic sulphide deposits (84/P210) AMIRA Progress Report, April 1986.

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Considerable progress has been achieved on the project since the inaugural sponsors' meeting in August 1985. In particular our study of the PQ - P north lens system at Que
River has led to an exciting re-evaluation of the geological structure of the mine and allowed a simple reconstruction of the prefolding geology and metal distribution. Based on this new interpretation of Que River, and the previous findings at Rosebery, outlined
in the accompanying report by Huston and Large (1986), many similarities in metal distribution and geometry are now obvious between the two deposits.

The regional studies to characterise the geochemistry and geological setting of the Mt Read Volcanics have concentrated on the silicate and trace element chemistry of a range of lava and intrusive types. Tony Crawford has compiled a considerable data base, which leads us towards a far greater understanding of the primary chemical
variations of volcanics in the arc, and has enabled some simple and interesting comparisons with more recent volcanic environments around the world.

Peter Ruxton has commenced a world wide study of gold and silver in volcanogenic deposits and some preliminary findings are presented here which indicate the study will
be very beneficial to this project. Project outlines are included for the planned work on the Stirling Valley and Lake Selina areas (Tasmania), Archean VMS deposits in
Western Australia and the Balcooma VMS in north Queensland.
The increase in company sponsors from six to ten since the project commenced last year, has enabled us to tackle the stated aims and objectives initially outlined. Two
Amira Research Associates (Peter McGoldrick and Peter Ruxton), are employed on a two-year contract in addition to a part-time research assistant. However the budget
remains tight.
Ross Large
Project Leader

Item Type: Report (Technical Report)
Authors/Creators:Large, RR and McGoldrick, PJ and Gordon, I and Hunns, SR and Ruxton, P and Huston, DL and Crawford, AJ
Publisher: University of Tasmania/AMIRA
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