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.
|Analyte||Certified Value||1SD||95% Confidence Limits Low||95% Confidence Limits High||Method|
|Au, Gold (ppm)||2.90||0.110||2.83||2.96||Pb Fire Assay|
|Cu, Copper (wt.%)||1.55||0.020||1.54||1.56||4-Acid Digestion|
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