Abstract
Four major high grade polymetallic massive sulphide deposits (Rosebery, Hercules, Que River and Hellyer) occur within the Cambrian Mount Read Volcanic arc in western Tasmania. The Central Volcanic Complex which is host to the ores is a high-K calc-alkaline andesite-dacite-rhyolite suite which has erupted through thick continental crust along an ancient continental margin. The presence of longitudinal faults which control both the locations of mineralization and younger grabben fill volcanic sequences indicate late stage rifting during the development of the arc.
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