VHMS Mineralisation in NW Papua New Guinea

摘要

Volcanogenic massive basemetal sulphide and gold mineralisation of predominantly low sulphidation style has been located within Lower Tertiary basaltic and felsic volcanic and sedimentary sequences at Ufuo, in the Left April River area, northwest Papua New Guinea. The four discrete massive sulphide bodies, which hjave been to far identified, occur with in a 3x5 km area situated withn a north west trending structural corridor. The suphide bodies are all localised on the margins of the corridor where the bounding major through going faluts ae transected by regional faults. Mineralisation is characterised by massive pyrite-bormite-sphalerite-barite-quartz-anhydrite deposition with later galena-tennantite-chalcopyite. Minor phases include enargite, goldfieldite and bismuth sulfosalts. Jasperoidal silica lenses and bioturbated sediments are closely associated with the massive sulphides.