OREAS 681 is a copper-nickel-platinum group element (PGE) ore certified reference material (CRM) prepared and certified by Ore Research & Exploration Pty Ltd. OREAS 681 has been prepared from PGE ore blended with barren mafic dolerite. The PGE ore was sourced from the Dishaba mine, owned and operated by Anglo American Platinum Ltd. The Dishaba mine is located in the west of Limpopo province, South Africa, approximately 250 kilometres north of Johannesburg. The common minerals of economic importance are sulphides of iron, nickel, copper and alloys of the PGE's. The barren mafic dolerite was sourced from the Late Cambrian Black Hills dolerite complex located in eastern Adelaide, Australia. OREAS 681 is one of a suite of five PGE ore CRMs ranging in 4E concentrations (4E = 4 elements; platinum (Pt), palladium (Pd), rhodium (Ro) and gold (Au)) from 0.82 to 6.1ppm.

OREAS 681 is a SuperCRM®