The Onemana prospect is located on the eastern Coromandel Peninsula, North Island, New Zealand. Systematic
exploration involving surface geological mapping, geophysics, rock and soil geochemistry, reverse-circulation and diamond
drilling has identified a number of important features of a fossil hydrothermal system at Onemana. This relatively intact
gold mineralised system is hosted within a sequence of rhyolitic volcanics and volcaniclastics, overlain by lake sediments,
sinters and hydrothermal eruption breccia. The system lies within a graben/half graben bounded by major NE-trending
faults which form the approximate boundaries to hydrothermal alteration.