OREAS 152a

OREAS 152a is one of three porphyry Cu-Au-Mo-S certified reference materials prepared from copper ore from the Waisoi district, Viti Levu, Fiji. The two deposits in the area are the Waisoi East deposit (quartz porphyry) and the Waisoi West deposit (diorite porphyry). Copper mineralisation in the region is accompanied by stockwork quartz veinlets and is characterised by bornite-chalcopyrite-pyrite assemblages. Twenty-one analytical laboratories participated in the program to certify the following elements:

  • Gold by fire assay (25-50g charge weight) with AAS (11 laboratories), ICP-OES (9 laboratories) finish and ICP-MS (1 laboratory);
  • Copper, molybdenum and sulphur by 4-acid (HNO3-HF-HClO4-HCl) digestion followed by ICP-OES and/or ICP-MS finish.
Analyte Certified Value 1SD 95% Confidence Limits Low 95% Confidence Limits High Method
Cu, Copper (wt.%) 0.385 0.009 0.379 0.391 4-Acid Digestion
Au, Gold (ppb) 116 5.0 114 118 Pb Fire Assay
Mo, Molybdenum (ppm) 80 5.0 77 82 4-Acid Digestion
S, Sulphur (wt.%) 0.921 0.046 0.900 0.941 4-Acid Digestion
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