OREAS 54Pa

Reference material OREAS 54Pa is a porphyry copper-gold standard prepared from ore and waste rock samples from a porphyry copper-gold deposit in central western New South Wales, Australia. Mineralisation in the region is hosted by a sequence of late Ordovician to Early Silurian volcanics, intrusives and sediments that occur within the Bogan Gate Synclinorial Zone of the Lachlan Fold Belt. Copper-gold mineralisation occurs as stockwork quartz veins and disseminations associated with potassic alteration. This alteration is intimately associated spatially and temporally with the small finger-like quartz monzonite porphyries that intrude the Goonumbla Volcanics.