OREAS 65a was prepared from gold-silver ore from Martabe, North Sumatra, Indonesia blended with fresh alkali olivine basalt from the Newer Volcanics Province, Victoria, Australia. Martabe is an epithermal high sulphidation gold deposit hosted by a sequence of tertiary volcanic and sedimentary rocks near a fault splay of the Great Sumatran Fault complex.
|Analyte||Certified Value||1SD||95% Confidence Limits Low||95% Confidence Limits High||Method|
|Au, Gold (ppm)||0.520||0.017||0.513||0.528||Pb Fire Assay|
|Ag, Silver (ppm)||7.80||0.700||7.40||8.20||4-Acid Digestion|
|Cu, Copper (ppm)||93||6.0||90||96||4-Acid Digestion|
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