This
contribution summarises new knowledge and data, obtained during a three year
ARCAMIRA funded research project, on the mineralogical and geochemical
characteristics of hydrothermal alteration associated with low sulfidation,
gold-silver epithermal deposits. These data are used to develop exploration
vectors for use at both deposit and district scales, plus techniques have been
established to distinguish ore grade epithermal systems from barren or low grade
systems. Deposits investigated were Ladolam, Papua New
Guinea, Gosowong and Mt Muro, Indonesia, Cerro
Vaguardia, Argentina and Bimurra and Twin Hills, Australia.