OREAS 61Pb

Reference material OREAS 61Pb was prepared from a blend of barren meta-andesite from Cracow, Queensland Australia and gold-bearing meta-andesite from the Gosowong gold mine in Maluku, Indonesia.  Both Gosowong and Cracow are epithermal deposits hosted by andesitic volcanics. The barren Cracow material is unmineralised low sulphidation epithermal quartz veining (epithermal quartz, carbonate, adularia and minor sulphides) and unmineralised altered andesites of the Camboon volcanics. The Gosowong ore consists of andesitic volcanic-hosted low sulphidation epithermal quartz veining containing an assemblage of epithermal quartz, carbonate, adularia, kaolin after adularia, chlorite and minor sulphides.