| Description: OREAS 233 was prepared from a blend of gold-bearing ore and barren greenstone. The ore was sourced from the Frogs Leg Gold Mine located 19km west of Kalgoorlie in Western Australia. The Cambrian greenstone was sourced from a quarry 145km north of Melbourne, Australia.
Thirty-one commercial analytical laboratories participated in the program to certify the elements shown below. The following methods were employed: - Gold by fire assay (15-40g charge weight) with AAS, ICP-OES or ICP-MS finish (31 laboratories);
- Gold by aqua regia digestion (15-50g sample weight) with ICP-MS, AAS or ICP-OES finish (22 laboratories);
- Gold by cyanide leach (20-200g) via a variety of cyanide leach methods (LeachWELL tablets, alkaline added sodium cyanide solution and sodium cyanide liquor with LeachWELL powder) with ICP or AAS finish (20 laboratories);
- Gold by x-ray photon assay on ~350g sample weights using 4 Chrysos PhotonAssay machines at 3 laboratories. Multiple rounds of data (comprising three or six replicates) were generated by different staff from 3 of the machines;
- Full ICP-OES and ICP-MS elemental suites by aqua regia digestion (up to 25 laboratories depending on the element);
- Full ICP-OES and ICP-MS elemental suites by 4-acid (HNO3-HF-HClO4-HCl) digestion (up to 25 laboratories depending on the element).
Download Certificate OREAS233 Download DataPack OREAS233 | Analyte | Certified Value | 1SD | 95% CI Low | 95% CI High | Method |
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| Ag, Silver (ppm) | 0.295 | 0.016 | 0.269 | 0.321 | 4-Acid Digestion | | Al, Aluminium (wt.%) | 6.97 | 0.206 | 6.8 | 7.15 | 4-Acid Digestion | | As, Arsenic (ppm) | 46.8 | 2.79 | 44.5 | 49.1 | 4-Acid Digestion | | Ba, Barium (ppm) | 129 | 4 | 125 | 133 | 4-Acid Digestion | | Be, Beryllium (ppm) | 0.39 | 0.028 | 0.35 | 0.42 | 4-Acid Digestion | | Bi, Bismuth (ppm) | 0.042 | 0.007 | 0.038 | 0.046 | 4-Acid Digestion | | Ca, Calcium (wt.%) | 7.1 | 0.396 | 6.89 | 7.31 | 4-Acid Digestion | | Cd, Cadmium (ppm) | 0.52 | 0.04 | 0.48 | 0.56 | 4-Acid Digestion | | Ce, Cerium (ppm) | 11.9 | 0.64 | 11.3 | 12.4 | 4-Acid Digestion | | Co, Cobalt (ppm) | 42 | 2.84 | 40.4 | 43.6 | 4-Acid Digestion | | Cr, Chromium (ppm) | 118 | 11 | 110 | 125 | 4-Acid Digestion | | Cs, Caesium (ppm) | 0.79 | 0.048 | 0.74 | 0.83 | 4-Acid Digestion | | Cu, Copper (ppm) | 162 | 6 | 157 | 167 | 4-Acid Digestion | | Dy, Dysprosium (ppm) | 3.69 | 0.164 | 3.5 | 3.88 | 4-Acid Digestion | | Er, Erbium (ppm) | 2.24 | 0.113 | 2.12 | 2.36 | 4-Acid Digestion | | Eu, Europium (ppm) | 0.89 | 0.025 | 0.86 | 0.92 | 4-Acid Digestion | | Fe, Iron (wt.%) | 7.72 | 0.272 | 7.52 | 7.93 | 4-Acid Digestion | | Ga, Gallium (ppm) | 15.1 | 0.74 | 14.4 | 15.8 | 4-Acid Digestion | | Gd, Gadolinium (ppm) | 3.16 | 0.288 | 2.91 | 3.41 | 4-Acid Digestion | | Hf, Hafnium (ppm) | 1.61 | 0.106 | 1.52 | 1.7 | 4-Acid Digestion | | Ho, Holmium (ppm) | 0.79 | 0.059 | 0.74 | 0.84 | 4-Acid Digestion | | In, Indium (ppm) | 0.073 | 0.006 | 0.065 | 0.08 | 4-Acid Digestion | | K, Potassium (wt.%) | 0.37 | 0.017 | 0.359 | 0.381 | 4-Acid Digestion | | La, Lanthanum (ppm) | 4.92 | 0.288 | 4.68 | 5.16 | 4-Acid Digestion | | Li, Lithium (ppm) | 11.2 | 0.46 | 10.7 | 11.7 | 4-Acid Digestion | | Lu, Lutetium (ppm) | 0.32 | 0.022 | 0.3 | 0.35 | 4-Acid Digestion | | Mg, Magnesium (wt.%) | 3.76 | 0.139 | 3.67 | 3.85 | 4-Acid Digestion | | Mn, Manganese (wt.%) | 0.134 | 0.004 | 0.131 | 0.137 | 4-Acid Digestion | | Mo, Molybdenum (ppm) | 0.92 | 0.09 | 0.82 | 1.03 | 4-Acid Digestion | | Na, Sodium (wt.%) | 1.73 | 0.065 | 1.69 | 1.77 | 4-Acid Digestion | | Nb, Niobium (ppm) | 3.31 | 0.233 | 3.16 | 3.46 | 4-Acid Digestion | | Nd, Neodymium (ppm) | 7.89 | 0.296 | 7.48 | 8.31 | 4-Acid Digestion | | Ni, Nickel (ppm) | 86 | 5 | 82 | 89 | 4-Acid Digestion | | P, Phosphorus (wt.%) | 0.04 | 0.002 | 0.038 | 0.042 | 4-Acid Digestion | | Pb, Lead (ppm) | 21.3 | 1.17 | 20.4 | 22.2 | 4-Acid Digestion | | Pr, Praseodymium (ppm) | 1.65 | 0.082 | 1.57 | 1.74 | 4-Acid Digestion | | Rb, Rubidium (ppm) | 10.9 | 0.6 | 10.4 | 11.4 | 4-Acid Digestion | | S, Sulphur (wt.%) | 0.319 | 0.024 | 0.304 | 0.333 | 4-Acid Digestion | | Sb, Antimony (ppm) | 1.1 | 0.095 | 1.02 | 1.17 | 4-Acid Digestion | | Sc, Scandium (ppm) | 39.6 | 2.28 | 38.1 | 41.2 | 4-Acid Digestion | | Sm, Samarium (ppm) | 2.38 | 0.165 | 2.2 | 2.55 | 4-Acid Digestion | | Sn, Tin (ppm) | 0.95 | 0.15 | 0.82 | 1.07 | 4-Acid Digestion | | Sr, Strontium (ppm) | 175 | 7 | 169 | 180 | 4-Acid Digestion | | Ta, Tantalum (ppm) | 0.23 | 0.04 | 0.21 | 0.26 | 4-Acid Digestion | | Tb, Terbium (ppm) | 0.55 | 0.049 | 0.51 | 0.59 | 4-Acid Digestion | | Te, Tellurium (ppm) | 0.091 | 0.014 | 0.074 | 0.108 | 4-Acid Digestion | | Th, Thorium (ppm) | 0.84 | 0.046 | 0.81 | 0.88 | 4-Acid Digestion | | Ti, Titanium (wt.%) | 0.595 | 0.021 | 0.582 | 0.608 | 4-Acid Digestion | | Tl, Thallium (ppm) | 0.18 | 0.011 | 0.17 | 0.19 | 4-Acid Digestion | | Tm, Thulium (ppm) | 0.33 | 0.015 | 0.31 | 0.35 | 4-Acid Digestion | | U, Uranium (ppm) | 0.25 | 0.017 | 0.23 | 0.27 | 4-Acid Digestion | | V, Vanadium (ppm) | 270 | 11 | 263 | 277 | 4-Acid Digestion | | W, Tungsten (ppm) | 26.3 | 1.96 | 25.1 | 27.4 | 4-Acid Digestion | | Y, Yttrium (ppm) | 19.8 | 1.01 | 19 | 20.6 | 4-Acid Digestion | | Yb, Ytterbium (ppm) | 2.21 | 0.094 | 2.1 | 2.33 | 4-Acid Digestion | | Zn, Zinc (ppm) | 128 | 7 | 124 | 132 | 4-Acid Digestion | | Zr, Zirconium (ppm) | 52 | 4.5 | 49 | 54 | 4-Acid Digestion | | Ag, Silver (ppm) | 0.285 | 0.028 | 0.259 | 0.312 | Aqua Regia Digestion | | Al, Aluminium (wt.%) | 3.45 | 0.145 | 3.35 | 3.55 | Aqua Regia Digestion | | As, Arsenic (ppm) | 47.4 | 2.67 | 45.3 | 49.6 | Aqua Regia Digestion | | B, Boron (ppm) | 20.2 | 2.5 | 17.6 | 22.8 | Aqua Regia Digestion | | Ba, Barium (ppm) | 26.2 | 2.27 | 24.8 | 27.7 | Aqua Regia Digestion | | Be, Beryllium (ppm) | 0.23 | 0.014 | 0.21 | 0.25 | Aqua Regia Digestion | | Bi, Bismuth (ppm) | 0.04 | 0.004 | 0.036 | 0.045 | Aqua Regia Digestion | | Ca, Calcium (wt.%) | 2.75 | 0.4 | 2.54 | 2.95 | Aqua Regia Digestion | | Cd, Cadmium (ppm) | 0.5 | 0.023 | 0.47 | 0.53 | Aqua Regia Digestion | | Ce, Cerium (ppm) | 8.97 | 0.467 | 8.58 | 9.37 | Aqua Regia Digestion | | Co, Cobalt (ppm) | 29.8 | 1.5 | 28.8 | 30.9 | Aqua Regia Digestion | | Cr, Chromium (ppm) | 19.1 | 1.53 | 18.2 | 20 | Aqua Regia Digestion | | Cs, Caesium (ppm) | 0.58 | 0.031 | 0.55 | 0.61 | Aqua Regia Digestion | | Cu, Copper (ppm) | 162 | 7 | 158 | 166 | Aqua Regia Digestion | | Dy, Dysprosium (ppm) | 2.18 | 0.28 | 1.92 | 2.44 | Aqua Regia Digestion | | Er, Erbium (ppm) | 1.28 | 0.17 | 1.12 | 1.43 | Aqua Regia Digestion | | Eu, Europium (ppm) | 0.39 | 0.031 | 0.35 | 0.44 | Aqua Regia Digestion | | Fe, Iron (wt.%) | 5.58 | 0.227 | 5.42 | 5.73 | Aqua Regia Digestion | | Ga, Gallium (ppm) | 10.2 | 0.79 | 9.7 | 10.8 | Aqua Regia Digestion | | Gd, Gadolinium (ppm) | 1.95 | 0.192 | 1.72 | 2.18 | Aqua Regia Digestion | | Ge, Germanium (ppm) | 0.11 | 0.03 | 0.08 | 0.14 | Aqua Regia Digestion | | Hf, Hafnium (ppm) | 0.51 | 0.06 | 0.46 | 0.55 | Aqua Regia Digestion | | Ho, Holmium (ppm) | 0.42 | 0.05 | 0.38 | 0.47 | Aqua Regia Digestion | | In, Indium (ppm) | 0.032 | 0.003 | 0.027 | 0.036 | Aqua Regia Digestion | | K, Potassium (wt.%) | 0.12 | 0.01 | 0.113 | 0.126 | Aqua Regia Digestion | | La, Lanthanum (ppm) | 3.83 | 0.149 | 3.67 | 3.99 | Aqua Regia Digestion | | Li, Lithium (ppm) | 10.2 | 0.74 | 9.7 | 10.7 | Aqua Regia Digestion | | Lu, Lutetium (ppm) | 0.15 | 0.02 | 0.13 | 0.17 | Aqua Regia Digestion | | Mg, Magnesium (wt.%) | 1.65 | 0.058 | 1.6 | 1.7 | Aqua Regia Digestion | | Mn, Manganese (wt.%) | 0.075 | 0.005 | 0.072 | 0.077 | Aqua Regia Digestion | | Mo, Molybdenum (ppm) | 0.83 | 0.042 | 0.78 | 0.88 | Aqua Regia Digestion | | Na, Sodium (wt.%) | 0.197 | 0.013 | 0.188 | 0.206 | Aqua Regia Digestion | | Nd, Neodymium (ppm) | 5.63 | 0.59 | 5.09 | 6.17 | Aqua Regia Digestion | | Ni, Nickel (ppm) | 56 | 3.8 | 54 | 59 | Aqua Regia Digestion | | P, Phosphorus (wt.%) | 0.038 | 0.003 | 0.037 | 0.04 | Aqua Regia Digestion | | Pb, Lead (ppm) | 20.9 | 1.12 | 20.1 | 21.7 | Aqua Regia Digestion | | Pr, Praseodymium (ppm) | 1.23 | 0.111 | 1.1 | 1.35 | Aqua Regia Digestion | | Pt, Platinum (ppb) | 14.5 | 1.1 | 12.7 | 16.3 | Aqua Regia Digestion | | Rb, Rubidium (ppm) | 5.05 | 0.357 | 4.81 | 5.3 | Aqua Regia Digestion | | Re, Rhenium (ppm) | 0.002 | 0.001 | 0.001 | 0.003 | Aqua Regia Digestion | | S, Sulphur (wt.%) | 0.32 | 0.026 | 0.304 | 0.336 | Aqua Regia Digestion | | Sb, Antimony (ppm) | 0.58 | 0.18 | 0.48 | 0.67 | Aqua Regia Digestion | | Sc, Scandium (ppm) | 5.45 | 0.327 | 5.07 | 5.84 | Aqua Regia Digestion | | Sm, Samarium (ppm) | 1.51 | 0.066 | 1.41 | 1.61 | Aqua Regia Digestion | | Sn, Tin (ppm) | 0.61 | 0.1 | 0.51 | 0.7 | Aqua Regia Digestion | | Sr, Strontium (ppm) | 33.8 | 3.5 | 31.7 | 35.8 | Aqua Regia Digestion | | Ta, Tantalum (ppm) | 0.01 | IND | IND | IND | Aqua Regia Digestion | | Tb, Terbium (ppm) | 0.33 | 0.028 | 0.3 | 0.35 | Aqua Regia Digestion | | Te, Tellurium (ppm) | 0.083 | 0.011 | 0.062 | 0.105 | Aqua Regia Digestion | | Th, Thorium (ppm) | 0.68 | 0.07 | 0.63 | 0.73 | Aqua Regia Digestion | | Ti, Titanium (wt.%) | 0.313 | 0.054 | 0.284 | 0.343 | Aqua Regia Digestion | | Tl, Thallium (ppm) | 0.097 | 0.008 | 0.088 | 0.106 | Aqua Regia Digestion | | Tm, Thulium (ppm) | 0.18 | 0.02 | 0.15 | 0.2 | Aqua Regia Digestion | | U, Uranium (ppm) | 0.17 | 0.011 | 0.15 | 0.18 | Aqua Regia Digestion | | V, Vanadium (ppm) | 139 | 21 | 128 | 150 | Aqua Regia Digestion | | W, Tungsten (ppm) | 18.2 | 2.7 | 16.7 | 19.7 | Aqua Regia Digestion | | Y, Yttrium (ppm) | 11.9 | 0.98 | 11.3 | 12.4 | Aqua Regia Digestion | | Yb, Ytterbium (ppm) | 1.19 | 0.18 | 1.04 | 1.35 | Aqua Regia Digestion | | Zn, Zinc (ppm) | 116 | 4 | 112 | 119 | Aqua Regia Digestion | | Zr, Zirconium (ppm) | 16.8 | 1.09 | 15.7 | 17.9 | Aqua Regia Digestion | | Au, Gold (ppm) | 0.992 | 0.036 | 0.975 | 1.008 | Aqua Regia Digestion (sample weights 10-50g) | | Au, Gold (ppm) | 1.03 | 0.041 | 1.01 | 1.05 | Cyanide Leach | | Au, Gold (ppm) | 1.05 | 0.029 | 1.05 | 1.06 | Pb Fire Assay | | Au, Gold (ppm) | 1.05 | 0.041 | 1.04 | 1.06 | PhotonAssay |
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