OREAS 67a 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)||2.24||0.096||2.19||2.28||Pb Fire Assay|
|Ag, Silver (ppm)||33.6||2.00||32.6||34.6||4-Acid Digestion|
|Cu, Copper (ppm)||325||10||321||330||4-Acid Digestion|
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