Gold mineralization at Piaba is hosted in a northern hanging wall sequence composed mainly of highly fractured tonalite and diorite intrusives with subordinate dacitic volcanics. A distinctive graphitic volcano-sedimentary sequence forms a structural footwall limiting the deposit to the south. The orebody dips steeply (80°) to the north north-west and gold occurs in several generations of quartz veins and also disseminated within the host intrusives and volcanics. Hydrothermal alteration in the deposit is intense and is dominated by quartz-graphite-chlorite-carbonate-sericite-pyrite. Zones (shoots) of high-grade gold mineralization controlled by oblique shear zones occur within the deposit. Drilling to date has been focused on defining the strike and depth potential of the Piaba deposit.