| Description: OREAS 234 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 OREAS234 Download DataPack OREAS234 | Analyte | Certified Value | 1SD | 95% CI Low | 95% CI High | Method |
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| Ag, Silver (ppm) | 0.338 | 0.015 | 0.322 | 0.354 | 4-Acid Digestion | | Al, Aluminium (wt.%) | 7.05 | 0.175 | 6.89 | 7.22 | 4-Acid Digestion | | As, Arsenic (ppm) | 55 | 3.6 | 53 | 58 | 4-Acid Digestion | | Ba, Barium (ppm) | 129 | 4 | 126 | 133 | 4-Acid Digestion | | Be, Beryllium (ppm) | 0.42 | 0.029 | 0.37 | 0.48 | 4-Acid Digestion | | Bi, Bismuth (ppm) | 0.047 | 0.009 | 0.039 | 0.055 | 4-Acid Digestion | | Ca, Calcium (wt.%) | 7.08 | 0.285 | 6.89 | 7.27 | 4-Acid Digestion | | Cd, Cadmium (ppm) | 0.57 | 0.03 | 0.54 | 0.6 | 4-Acid Digestion | | Ce, Cerium (ppm) | 12.9 | 0.72 | 12.3 | 13.5 | 4-Acid Digestion | | Co, Cobalt (ppm) | 41.2 | 2.17 | 39.9 | 42.6 | 4-Acid Digestion | | Cr, Chromium (ppm) | 110 | 12 | 103 | 117 | 4-Acid Digestion | | Cs, Caesium (ppm) | 0.92 | 0.04 | 0.88 | 0.97 | 4-Acid Digestion | | Cu, Copper (ppm) | 175 | 6 | 169 | 181 | 4-Acid Digestion | | Dy, Dysprosium (ppm) | 3.6 | 0.191 | 3.46 | 3.74 | 4-Acid Digestion | | Er, Erbium (ppm) | 2.17 | 0.087 | 2.1 | 2.24 | 4-Acid Digestion | | Eu, Europium (ppm) | 0.9 | 0.047 | 0.85 | 0.96 | 4-Acid Digestion | | Fe, Iron (wt.%) | 7.53 | 0.225 | 7.33 | 7.73 | 4-Acid Digestion | | Ga, Gallium (ppm) | 15.5 | 0.65 | 14.8 | 16.2 | 4-Acid Digestion | | Gd, Gadolinium (ppm) | 3.18 | 0.233 | 2.96 | 3.4 | 4-Acid Digestion | | Hf, Hafnium (ppm) | 1.64 | 0.103 | 1.53 | 1.76 | 4-Acid Digestion | | Ho, Holmium (ppm) | 0.76 | 0.052 | 0.71 | 0.82 | 4-Acid Digestion | | In, Indium (ppm) | 0.074 | 0.009 | 0.064 | 0.083 | 4-Acid Digestion | | K, Potassium (wt.%) | 0.46 | 0.018 | 0.446 | 0.474 | 4-Acid Digestion | | La, Lanthanum (ppm) | 5.51 | 0.313 | 5.27 | 5.75 | 4-Acid Digestion | | Li, Lithium (ppm) | 11 | 0.81 | 10.4 | 11.7 | 4-Acid Digestion | | Lu, Lutetium (ppm) | 0.31 | 0.019 | 0.29 | 0.34 | 4-Acid Digestion | | Mg, Magnesium (wt.%) | 3.59 | 0.125 | 3.49 | 3.69 | 4-Acid Digestion | | Mn, Manganese (wt.%) | 0.13 | 0.004 | 0.127 | 0.133 | 4-Acid Digestion | | Mo, Molybdenum (ppm) | 1.49 | 0.108 | 1.4 | 1.58 | 4-Acid Digestion | | Na, Sodium (wt.%) | 1.64 | 0.069 | 1.6 | 1.69 | 4-Acid Digestion | | Nb, Niobium (ppm) | 3.36 | 0.226 | 3.17 | 3.54 | 4-Acid Digestion | | Nd, Neodymium (ppm) | 8.32 | 0.37 | 7.93 | 8.7 | 4-Acid Digestion | | Ni, Nickel (ppm) | 81 | 3.9 | 79 | 84 | 4-Acid Digestion | | P, Phosphorus (wt.%) | 0.041 | 0.002 | 0.039 | 0.042 | 4-Acid Digestion | | Pb, Lead (ppm) | 26.4 | 1.36 | 25.3 | 27.5 | 4-Acid Digestion | | Pr, Praseodymium (ppm) | 1.75 | 0.088 | 1.65 | 1.85 | 4-Acid Digestion | | Rb, Rubidium (ppm) | 14 | 0.75 | 13.5 | 14.4 | 4-Acid Digestion | | S, Sulphur (wt.%) | 0.376 | 0.028 | 0.36 | 0.391 | 4-Acid Digestion | | Sb, Antimony (ppm) | 1.5 | 0.1 | 1.41 | 1.58 | 4-Acid Digestion | | Sc, Scandium (ppm) | 38.7 | 1.7 | 37.3 | 40.2 | 4-Acid Digestion | | Sm, Samarium (ppm) | 2.43 | 0.097 | 2.3 | 2.56 | 4-Acid Digestion | | Sn, Tin (ppm) | 0.98 | 0.096 | 0.9 | 1.05 | 4-Acid Digestion | | Sr, Strontium (ppm) | 211 | 10 | 205 | 217 | 4-Acid Digestion | | Ta, Tantalum (ppm) | 0.23 | 0.02 | 0.21 | 0.25 | 4-Acid Digestion | | Tb, Terbium (ppm) | 0.55 | 0.04 | 0.51 | 0.59 | 4-Acid Digestion | | Te, Tellurium (ppm) | 0.096 | 0.015 | 0.073 | 0.119 | 4-Acid Digestion | | Th, Thorium (ppm) | 1.03 | 0.073 | 0.95 | 1.11 | 4-Acid Digestion | | Ti, Titanium (wt.%) | 0.587 | 0.022 | 0.571 | 0.603 | 4-Acid Digestion | | Tl, Thallium (ppm) | 0.23 | 0.013 | 0.22 | 0.25 | 4-Acid Digestion | | Tm, Thulium (ppm) | 0.31 | 0.015 | 0.29 | 0.33 | 4-Acid Digestion | | U, Uranium (ppm) | 0.29 | 0.02 | 0.27 | 0.31 | 4-Acid Digestion | | V, Vanadium (ppm) | 263 | 9 | 253 | 272 | 4-Acid Digestion | | W, Tungsten (ppm) | 26.2 | 1.62 | 25.2 | 27.2 | 4-Acid Digestion | | Y, Yttrium (ppm) | 19.5 | 0.93 | 18.7 | 20.3 | 4-Acid Digestion | | Yb, Ytterbium (ppm) | 2.14 | 0.112 | 2.03 | 2.25 | 4-Acid Digestion | | Zn, Zinc (ppm) | 135 | 7 | 130 | 140 | 4-Acid Digestion | | Zr, Zirconium (ppm) | 55 | 4.5 | 51 | 58 | 4-Acid Digestion | | Ag, Silver (ppm) | 0.341 | 0.029 | 0.316 | 0.366 | Aqua Regia Digestion | | Al, Aluminium (wt.%) | 3.53 | 0.171 | 3.41 | 3.64 | Aqua Regia Digestion | | As, Arsenic (ppm) | 55 | 2 | 53 | 57 | Aqua Regia Digestion | | B, Boron (ppm) | 19.8 | 3.9 | 16.5 | 23 | Aqua Regia Digestion | | Ba, Barium (ppm) | 29.6 | 2.07 | 28 | 31.3 | Aqua Regia Digestion | | Be, Beryllium (ppm) | 0.27 | 0.021 | 0.22 | 0.31 | Aqua Regia Digestion | | Bi, Bismuth (ppm) | 0.045 | 0.005 | 0.037 | 0.053 | Aqua Regia Digestion | | Ca, Calcium (wt.%) | 2.87 | 0.38 | 2.68 | 3.07 | Aqua Regia Digestion | | Cd, Cadmium (ppm) | 0.54 | 0.028 | 0.51 | 0.57 | Aqua Regia Digestion | | Ce, Cerium (ppm) | 10.1 | 0.56 | 9.8 | 10.4 | Aqua Regia Digestion | | Co, Cobalt (ppm) | 29.3 | 1.43 | 28.6 | 30 | Aqua Regia Digestion | | Cr, Chromium (ppm) | 21.7 | 1.74 | 20.7 | 22.7 | Aqua Regia Digestion | | Cs, Caesium (ppm) | 0.67 | 0.045 | 0.64 | 0.69 | Aqua Regia Digestion | | Cu, Copper (ppm) | 174 | 7 | 170 | 178 | Aqua Regia Digestion | | Dy, Dysprosium (ppm) | 2.06 | 0.18 | 1.87 | 2.25 | Aqua Regia Digestion | | Er, Erbium (ppm) | 1.28 | 0.18 | 1.1 | 1.45 | Aqua Regia Digestion | | Eu, Europium (ppm) | 0.42 | 0.06 | 0.35 | 0.49 | Aqua Regia Digestion | | Fe, Iron (wt.%) | 5.39 | 0.194 | 5.24 | 5.53 | Aqua Regia Digestion | | Ga, Gallium (ppm) | 10.1 | 0.88 | 9.6 | 10.7 | Aqua Regia Digestion | | Gd, Gadolinium (ppm) | 1.97 | 0.24 | 1.74 | 2.2 | Aqua Regia Digestion | | Ge, Germanium (ppm) | 0.11 | 0.02 | 0.08 | 0.13 | Aqua Regia Digestion | | Hf, Hafnium (ppm) | 0.51 | 0.09 | 0.46 | 0.57 | Aqua Regia Digestion | | Ho, Holmium (ppm) | 0.42 | 0.04 | 0.37 | 0.46 | Aqua Regia Digestion | | In, Indium (ppm) | 0.036 | 0.004 | 0.031 | 0.041 | Aqua Regia Digestion | | K, Potassium (wt.%) | 0.157 | 0.013 | 0.149 | 0.165 | Aqua Regia Digestion | | La, Lanthanum (ppm) | 4.37 | 0.189 | 4.23 | 4.5 | Aqua Regia Digestion | | Li, Lithium (ppm) | 10.1 | 0.76 | 9.7 | 10.6 | Aqua Regia Digestion | | Lu, Lutetium (ppm) | 0.16 | 0.02 | 0.14 | 0.18 | Aqua Regia Digestion | | Mg, Magnesium (wt.%) | 1.63 | 0.063 | 1.59 | 1.67 | Aqua Regia Digestion | | Mn, Manganese (wt.%) | 0.074 | 0.004 | 0.071 | 0.076 | Aqua Regia Digestion | | Mo, Molybdenum (ppm) | 1.39 | 0.061 | 1.32 | 1.45 | Aqua Regia Digestion | | Na, Sodium (wt.%) | 0.217 | 0.014 | 0.208 | 0.225 | Aqua Regia Digestion | | Nd, Neodymium (ppm) | 6.02 | 0.65 | 5.42 | 6.61 | Aqua Regia Digestion | | Ni, Nickel (ppm) | 55 | 4.7 | 53 | 58 | Aqua Regia Digestion | | P, Phosphorus (wt.%) | 0.039 | 0.002 | 0.038 | 0.04 | Aqua Regia Digestion | | Pb, Lead (ppm) | 26.2 | 1.82 | 25.1 | 27.4 | Aqua Regia Digestion | | Pr, Praseodymium (ppm) | 1.32 | 0.119 | 1.19 | 1.46 | Aqua Regia Digestion | | Pt, Platinum (ppb) | 13.9 | 0.9 | 12.4 | 15.5 | Aqua Regia Digestion | | Rb, Rubidium (ppm) | 6.39 | 0.62 | 6.05 | 6.74 | Aqua Regia Digestion | | Re, Rhenium (ppm) | 0.002 | 0 | 0.001 | 0.003 | Aqua Regia Digestion | | S, Sulphur (wt.%) | 0.37 | 0.026 | 0.355 | 0.385 | Aqua Regia Digestion | | Sb, Antimony (ppm) | 0.81 | 0.24 | 0.68 | 0.94 | Aqua Regia Digestion | | Sc, Scandium (ppm) | 6.46 | 0.505 | 6.08 | 6.84 | Aqua Regia Digestion | | Sm, Samarium (ppm) | 1.56 | 0.116 | 1.44 | 1.69 | Aqua Regia Digestion | | Sn, Tin (ppm) | 0.62 | 0.08 | 0.56 | 0.68 | Aqua Regia Digestion | | Sr, Strontium (ppm) | 48.8 | 7.7 | 44.8 | 52.8 | Aqua Regia Digestion | | Ta, Tantalum (ppm) | 0.01 | IND | IND | IND | Aqua Regia Digestion | | Tb, Terbium (ppm) | 0.32 | 0.026 | 0.3 | 0.35 | Aqua Regia Digestion | | Te, Tellurium (ppm) | 0.094 | 0.01 | 0.079 | 0.11 | Aqua Regia Digestion | | Th, Thorium (ppm) | 0.83 | 0.09 | 0.75 | 0.91 | Aqua Regia Digestion | | Ti, Titanium (wt.%) | 0.325 | 0.049 | 0.298 | 0.352 | Aqua Regia Digestion | | Tl, Thallium (ppm) | 0.12 | 0.007 | 0.12 | 0.13 | Aqua Regia Digestion | | Tm, Thulium (ppm) | 0.18 | 0.02 | 0.16 | 0.2 | Aqua Regia Digestion | | U, Uranium (ppm) | 0.2 | 0.011 | 0.19 | 0.22 | Aqua Regia Digestion | | V, Vanadium (ppm) | 136 | 16 | 127 | 145 | Aqua Regia Digestion | | W, Tungsten (ppm) | 18.1 | 2.8 | 16.8 | 19.5 | Aqua Regia Digestion | | Y, Yttrium (ppm) | 11.6 | 1.3 | 10.8 | 12.3 | Aqua Regia Digestion | | Yb, Ytterbium (ppm) | 1.12 | 0.12 | 0.99 | 1.25 | Aqua Regia Digestion | | Zn, Zinc (ppm) | 123 | 5 | 120 | 126 | Aqua Regia Digestion | | Zr, Zirconium (ppm) | 17.7 | 1.59 | 16.5 | 19 | Aqua Regia Digestion | | Au, Gold (ppm) | 1.12 | 0.058 | 1.09 | 1.14 | Aqua Regia Digestion (sample weights 10-50g) | | Au, Gold (ppm) | 1.17 | 0.064 | 1.14 | 1.2 | Cyanide Leach | | Au, Gold (ppm) | 1.2 | 0.03 | 1.19 | 1.21 | Pb Fire Assay | | Au, Gold (ppm) | 1.19 | 0.047 | 1.18 | 1.2 | PhotonAssay |
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