OREAS 628 was prepared from a blend of Zn-Pb-Cu-Ag-Au bearing ores and concentrates from MMG’s Rosebery operation on the west coast of Tasmania, Australia and barren rhyodacite rock sourced from a quarry east of Melbourne, Australia. The key minerals of economic importance include sphalerite, galena, chalcopyrite (minor tetrahedrite) and electrum. Gold occurs as free electrum and also as inclusions within sulphides; silver occurs within tetrahedrite and galena. Pyrite, quartz, silicates, barite, mangano carbonate, pyrrhotite and magnetite form the main gangue minerals (Denwer et al., 2017. Rosebery Cu-Pb-Zn-Ag-Au volcanogenic massive sulfide deposit, in Australian Ore Deposits (ed: G N Phillips), pp 817-821 (The Australian Institute of Mining and Metallurgy; Melbourne). Twenty eight commercial analytical laboratories participated in the characterisation program to certify the elements reported below.

  • Gold by 25-40g fire assay with ICP or AAS finish;
  • Gold by 15-50g aqua regia digestion with ICP-OES, ICP-MS, AAS or graphite furnace AAS finish;
  • Full ICP-OES and ICP-MS elemental suites by peroxide fusion;
  • Full ICP-OES and ICP-MS elemental suites by 4-acid digestion (HF-HNO3-HClO4-HCl);
  • Full ICP-OES and ICP-MS elemental suites by aqua regia digestion;
  • A limited suite of elements by 3-acid digestion (HNO3-HCIO4-HCI) with ICP-OES or AAS finish;
  • Sulphur by infrared combustion analysis;
  • Homogeneity evaluation of Au using instrumental neutron activation analysis (INAA) on 20 x 85mg subsamples (undertaken by ANSTO, Lucas Heights).
Note: Analyte values are indicative only and may change when certified.

Analyte Indicative Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
Zn, Zinc (wt.%) 1.04 TBD TBD TBD 4-Acid Digestion
Cu, Copper (wt.%) 1.77 TBD TBD TBD 4-Acid Digestion
Au, Gold (ppm) 0.870 TBD TBD TBD Pb Fire Assay
S, Sulphur (wt.%) 3.40 TBD TBD TBD Infrared Combustion
Ag, Silver (ppm) 10.1 TBD TBD TBD Borate / Peroxide Fusion ICP
Pb, Lead (wt.%) 0.250 TBD TBD TBD Borate / Peroxide Fusion ICP
Certificate DataPack SDS NRAM (255 KB)
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