| Description: OREAS 993 was prepared from a copper-gold-silver concentrate sample supplied by Newcrest Mining Limited’s Cadia Valley Operations near Orange, New South Wales, Australia. Ten ‘umpire’ laboratories determined the key elements: Au, Cu and Ag. The term ‘umpire’ here refers to the routine analysis of these laboratories using classical methodologies for precious and base metals. Twenty-three geoanalytical laboratories also participated in the analytical program for the following: - Au, Pt and Pd by fire assay
- Cu, Al2O3, MgO, SiO2, Fe, S, CaO, TiO2, K and Mo by oxidising fusion with XRF
- Total Sulphur by infrared combustion furnace
- Hg by low level, aqua regia digestion
- Fluorine by ion selective electrode
- Chlorine by various methods
- Ag, As, Bi, Cd, Co, Cr, Ni, Pb, Re, Sb, Se, Te, Th, U and Zn by 4-acid digestion
- Gold by instrumental neutron activation analysis (INAA) on 20 x 85mg subsamples to confirm homogeneity (undertaken by ANSTO, Lucas Heights)
Download Certificate OREAS993 Download DataPack OREAS993 | Analyte | Certified Value | 1SD | 95% CI Low | 95% CI High | Method |
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| Ag, Silver (ppm) | 39.7 | 1.24 | 39.1 | 40.3 | 4-Acid Digestion | | Al, Aluminium (wt.%) | 1.6 | 0.044 | 1.57 | 1.63 | 4-Acid Digestion | | As, Arsenic (ppm) | 143 | 7 | 140 | 146 | 4-Acid Digestion | | Ba, Barium (ppm) | 122 | 7 | 116 | 127 | 4-Acid Digestion | | Be, Beryllium (ppm) | 0.5 | IND | IND | IND | 4-Acid Digestion | | Bi, Bismuth (ppm) | 23.8 | 5 | 20.4 | 27.1 | 4-Acid Digestion | | Ca, Calcium (wt.%) | 0.702 | 0.023 | 0.687 | 0.717 | 4-Acid Digestion | | Cd, Cadmium (ppm) | 6.41 | 1.58 | 5.08 | 7.73 | 4-Acid Digestion | | Ce, Cerium (ppm) | 18.2 | 1.38 | 16.7 | 19.7 | 4-Acid Digestion | | Co, Cobalt (ppm) | 95 | 5.4 | 93 | 98 | 4-Acid Digestion | | Cr, Chromium (ppm) | 39.5 | 4.2 | 35.9 | 43 | 4-Acid Digestion | | Dy, Dysprosium (ppm) | 1.02 | 0.07 | 0.97 | 1.07 | 4-Acid Digestion | | Er, Erbium (ppm) | 0.54 | 0.06 | 0.48 | 0.59 | 4-Acid Digestion | | Eu, Europium (ppm) | 0.43 | 0.07 | 0.37 | 0.5 | 4-Acid Digestion | | Fe, Iron (wt.%) | 25.75 | 0.735 | 25.35 | 26.15 | 4-Acid Digestion | | Ga, Gallium (ppm) | 3.93 | 0.286 | 3.56 | 4.3 | 4-Acid Digestion | | Gd, Gadolinium (ppm) | 1.32 | 0.21 | 1.12 | 1.53 | 4-Acid Digestion | | Hf, Hafnium (ppm) | 0.71 | 0.09 | 0.63 | 0.79 | 4-Acid Digestion | | Ho, Holmium (ppm) | 0.19 | 0.018 | 0.17 | 0.21 | 4-Acid Digestion | | In, Indium (ppm) | 1.54 | 0.115 | 1.42 | 1.66 | 4-Acid Digestion | | K, Potassium (wt.%) | 0.634 | 0.023 | 0.618 | 0.65 | 4-Acid Digestion | | La, Lanthanum (ppm) | 10.3 | 0.45 | 10 | 10.7 | 4-Acid Digestion | | Lu, Lutetium (ppm) | 0.083 | 0.012 | 0.069 | 0.098 | 4-Acid Digestion | | Mg, Magnesium (wt.%) | 0.301 | 0.017 | 0.289 | 0.313 | 4-Acid Digestion | | Mn, Manganese (wt.%) | 0.008 | 0.001 | 0.007 | 0.009 | 4-Acid Digestion | | Mo, Molybdenum (ppm) | 2535 | 196 | 2406 | 2665 | 4-Acid Digestion | | Na, Sodium (wt.%) | 0.357 | 0.009 | 0.352 | 0.362 | 4-Acid Digestion | | Nb, Niobium (ppm) | 2.1 | 0.178 | 1.98 | 2.22 | 4-Acid Digestion | | Nd, Neodymium (ppm) | 7.55 | 0.325 | 7.17 | 7.93 | 4-Acid Digestion | | Ni, Nickel (ppm) | 52 | 6 | 49 | 55 | 4-Acid Digestion | | P, Phosphorus (wt.%) | 0.014 | 0.003 | 0.012 | 0.016 | 4-Acid Digestion | | Pb, Lead (ppm) | 230 | 17 | 221 | 239 | 4-Acid Digestion | | Pr, Praseodymium (ppm) | 1.98 | 0.081 | 1.88 | 2.07 | 4-Acid Digestion | | Rb, Rubidium (ppm) | 20 | 1.5 | 18.6 | 21.5 | 4-Acid Digestion | | Re, Rhenium (ppm) | 6.15 | 0.65 | 5.49 | 6.81 | 4-Acid Digestion | | S, Sulphur (wt.%) | 30.18 | 1.309 | 28.8 | 31.56 | 4-Acid Digestion | | Sb, Antimony (ppm) | 55 | 8 | 49 | 60 | 4-Acid Digestion | | Sc, Scandium (ppm) | 4.94 | 0.369 | 4.75 | 5.13 | 4-Acid Digestion | | Se, Selenium (ppm) | 194 | 17 | 182 | 207 | 4-Acid Digestion | | Sm, Samarium (ppm) | 1.52 | 0.126 | 1.38 | 1.66 | 4-Acid Digestion | | Sn, Tin (ppm) | 1.64 | 0.35 | 1.53 | 1.75 | 4-Acid Digestion | | Sr, Strontium (ppm) | 149 | 7 | 144 | 155 | 4-Acid Digestion | | Ta, Tantalum (ppm) | 0.099 | 0.019 | 0.077 | 0.121 | 4-Acid Digestion | | Tb, Terbium (ppm) | 0.17 | 0.02 | 0.15 | 0.18 | 4-Acid Digestion | | Te, Tellurium (ppm) | 12.7 | 1.7 | 10.9 | 14.5 | 4-Acid Digestion | | Th, Thorium (ppm) | 2.44 | 0.208 | 2.22 | 2.66 | 4-Acid Digestion | | Ti, Titanium (wt.%) | 0.105 | 0.005 | 0.102 | 0.108 | 4-Acid Digestion | | Tl, Thallium (ppm) | 0.52 | 0.13 | 0.44 | 0.61 | 4-Acid Digestion | | Tm, Thulium (ppm) | 0.075 | 0.019 | 0.06 | 0.09 | 4-Acid Digestion | | U, Uranium (ppm) | 0.86 | 0.059 | 0.81 | 0.91 | 4-Acid Digestion | | V, Vanadium (ppm) | 45.8 | 4.6 | 42 | 49.7 | 4-Acid Digestion | | W, Tungsten (ppm) | 2.95 | 0.42 | 2.44 | 3.47 | 4-Acid Digestion | | Y, Yttrium (ppm) | 5.41 | 0.332 | 5.13 | 5.69 | 4-Acid Digestion | | Yb, Ytterbium (ppm) | 0.53 | 0.11 | 0.46 | 0.59 | 4-Acid Digestion | | Zn, Zinc (ppm) | 885 | 43 | 865 | 906 | 4-Acid Digestion | | Zr, Zirconium (ppm) | 24.9 | 1.12 | 24.4 | 25.3 | 4-Acid Digestion | | Ag, Silver (ppm) | 41.6 | 1.12 | 40.7 | 42.5 | Acid Digestion (no HF) | | Hg, Mercury (ppm) | 1.92 | 0.143 | 1.82 | 2.03 | Aqua Regia Digestion | | Cu, Copper (wt.%) | 23.9 | 0.061 | 23.85 | 23.95 | Classical Wet Chemistry | | S, Sulphur (wt.%) | 29.92 | 0.784 | 29.48 | 30.37 | Infrared Combustion | | F, Fluorine (ppm) | 511 | 46 | 484 | 538 | Miscellaneous Assay Methods | | Al2O3, Aluminium(III) oxide (wt.%) | 3.03 | 0.073 | 2.97 | 3.08 | Oxidising Fusion XRF | | CaO, Calcium oxide (wt.%) | 0.982 | 0.012 | 0.974 | 0.99 | Oxidising Fusion XRF | | Cu, Copper (wt.%) | 23.36 | 0.364 | 23.08 | 23.64 | Oxidising Fusion XRF | | Fe, Iron (wt.%) | 25.41 | 0.291 | 25.19 | 25.62 | Oxidising Fusion XRF | | K, Potassium (wt.%) | 0.64 | 0.021 | 0.623 | 0.658 | Oxidising Fusion XRF | | MgO, Magnesium oxide (wt.%) | 0.512 | 0.067 | 0.448 | 0.576 | Oxidising Fusion XRF | | Mo, Molybdenum (ppm) | 2512 | 119 | 2414 | 2611 | Oxidising Fusion XRF | | S, Sulphur (wt.%) | 30.06 | 0.733 | 29.49 | 30.64 | Oxidising Fusion XRF | | SiO2, Silicon dioxide (wt.%) | 10.56 | 0.187 | 10.42 | 10.7 | Oxidising Fusion XRF | | TiO2, Titanium dioxide (wt.%) | 0.198 | 0.013 | 0.189 | 0.206 | Oxidising Fusion XRF | | Au, Gold (ppm) | 54.85 | 1.324 | 53.6 | 56.09 | Pb Fire Assay | | Pd, Palladium (ppb) | 529 | 32 | 513 | 545 | Pb Fire Assay | | Pt, Platinum (ppb) | 43.8 | 5.9 | 40.4 | 47.1 | Pb Fire Assay | | Au, Gold (ppm) | 56.04 | 0.296 | 55.87 | 56.22 | Pb Fire Assay (full corrections) |
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