| Description: OREAS 230 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 OREAS230 Download DataPack OREAS230 | Analyte | Certified Value | 1SD | 95% CI Low | 95% CI High | Method |
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| Ag, Silver (ppm) | 0.128 | 0.014 | 0.112 | 0.143 | 4-Acid Digestion | | Al, Aluminium (wt.%) | 7.35 | 0.206 | 7.12 | 7.58 | 4-Acid Digestion | | As, Arsenic (ppm) | 17.3 | 1.53 | 16 | 18.7 | 4-Acid Digestion | | Ba, Barium (ppm) | 79 | 3.6 | 76 | 83 | 4-Acid Digestion | | Be, Beryllium (ppm) | 0.34 | 0.029 | 0.3 | 0.39 | 4-Acid Digestion | | Ca, Calcium (wt.%) | 7.74 | 0.401 | 7.52 | 7.97 | 4-Acid Digestion | | Cd, Cadmium (ppm) | 0.26 | 0.03 | 0.24 | 0.28 | 4-Acid Digestion | | Ce, Cerium (ppm) | 10.2 | 0.63 | 9.7 | 10.8 | 4-Acid Digestion | | Co, Cobalt (ppm) | 44.7 | 2.47 | 43.2 | 46.3 | 4-Acid Digestion | | Cr, Chromium (ppm) | 106 | 12 | 98 | 114 | 4-Acid Digestion | | Cs, Caesium (ppm) | 0.38 | 0.019 | 0.35 | 0.41 | 4-Acid Digestion | | Cu, Copper (ppm) | 172 | 5 | 166 | 177 | 4-Acid Digestion | | Dy, Dysprosium (ppm) | 3.79 | 0.163 | 3.59 | 3.99 | 4-Acid Digestion | | Er, Erbium (ppm) | 2.32 | 0.113 | 2.21 | 2.43 | 4-Acid Digestion | | Eu, Europium (ppm) | 0.92 | 0.043 | 0.86 | 0.98 | 4-Acid Digestion | | Fe, Iron (wt.%) | 8.04 | 0.287 | 7.81 | 8.27 | 4-Acid Digestion | | Ga, Gallium (ppm) | 15.7 | 0.98 | 14.8 | 16.5 | 4-Acid Digestion | | Gd, Gadolinium (ppm) | 3.35 | 0.261 | 3.12 | 3.58 | 4-Acid Digestion | | Hf, Hafnium (ppm) | 1.58 | 0.094 | 1.47 | 1.69 | 4-Acid Digestion | | Ho, Holmium (ppm) | 0.8 | 0.037 | 0.76 | 0.83 | 4-Acid Digestion | | In, Indium (ppm) | 0.07 | 0.006 | 0.061 | 0.079 | 4-Acid Digestion | | K, Potassium (wt.%) | 0.265 | 0.016 | 0.255 | 0.275 | 4-Acid Digestion | | La, Lanthanum (ppm) | 4.08 | 0.352 | 3.84 | 4.33 | 4-Acid Digestion | | Li, Lithium (ppm) | 10.5 | 0.85 | 9.7 | 11.3 | 4-Acid Digestion | | Lu, Lutetium (ppm) | 0.33 | 0.016 | 0.31 | 0.35 | 4-Acid Digestion | | Mg, Magnesium (wt.%) | 3.99 | 0.166 | 3.85 | 4.13 | 4-Acid Digestion | | Mn, Manganese (wt.%) | 0.137 | 0.004 | 0.133 | 0.141 | 4-Acid Digestion | | Mo, Molybdenum (ppm) | 0.72 | 0.07 | 0.64 | 0.79 | 4-Acid Digestion | | Na, Sodium (wt.%) | 1.68 | 0.075 | 1.62 | 1.73 | 4-Acid Digestion | | Nb, Niobium (ppm) | 3.39 | 0.253 | 3.21 | 3.58 | 4-Acid Digestion | | Nd, Neodymium (ppm) | 7.56 | 0.343 | 7.17 | 7.94 | 4-Acid Digestion | | Ni, Nickel (ppm) | 86 | 5.8 | 82 | 89 | 4-Acid Digestion | | P, Phosphorus (wt.%) | 0.04 | 0.002 | 0.038 | 0.042 | 4-Acid Digestion | | Pb, Lead (ppm) | 8.54 | 0.656 | 8.06 | 9.02 | 4-Acid Digestion | | Pr, Praseodymium (ppm) | 1.5 | 0.093 | 1.4 | 1.59 | 4-Acid Digestion | | Rb, Rubidium (ppm) | 6.37 | 0.455 | 6 | 6.75 | 4-Acid Digestion | | S, Sulphur (wt.%) | 0.188 | 0.016 | 0.178 | 0.198 | 4-Acid Digestion | | Sb, Antimony (ppm) | 0.56 | 0.05 | 0.5 | 0.62 | 4-Acid Digestion | | Sc, Scandium (ppm) | 43.7 | 2.36 | 41.9 | 45.4 | 4-Acid Digestion | | Sm, Samarium (ppm) | 2.39 | 0.137 | 2.23 | 2.55 | 4-Acid Digestion | | Sn, Tin (ppm) | 0.77 | 0.11 | 0.71 | 0.83 | 4-Acid Digestion | | Sr, Strontium (ppm) | 231 | 10 | 223 | 238 | 4-Acid Digestion | | Ta, Tantalum (ppm) | 0.23 | 0.03 | 0.21 | 0.25 | 4-Acid Digestion | | Tb, Terbium (ppm) | 0.57 | 0.033 | 0.53 | 0.61 | 4-Acid Digestion | | Te, Tellurium (ppm) | 0.074 | 0.021 | 0.051 | 0.096 | 4-Acid Digestion | | Th, Thorium (ppm) | 0.5 | 0.038 | 0.47 | 0.52 | 4-Acid Digestion | | Ti, Titanium (wt.%) | 0.639 | 0.026 | 0.618 | 0.66 | 4-Acid Digestion | | Tl, Thallium (ppm) | 0.08 | 0.008 | 0.067 | 0.093 | 4-Acid Digestion | | Tm, Thulium (ppm) | 0.34 | 0.012 | 0.31 | 0.36 | 4-Acid Digestion | | U, Uranium (ppm) | 0.15 | 0.02 | 0.13 | 0.17 | 4-Acid Digestion | | V, Vanadium (ppm) | 292 | 11 | 283 | 301 | 4-Acid Digestion | | W, Tungsten (ppm) | 8.14 | 0.633 | 7.68 | 8.6 | 4-Acid Digestion | | Y, Yttrium (ppm) | 20.6 | 1.02 | 19.7 | 21.6 | 4-Acid Digestion | | Yb, Ytterbium (ppm) | 2.26 | 0.133 | 2.14 | 2.38 | 4-Acid Digestion | | Zn, Zinc (ppm) | 98 | 5.1 | 95 | 102 | 4-Acid Digestion | | Zr, Zirconium (ppm) | 50 | 3 | 47 | 53 | 4-Acid Digestion | | Ag, Silver (ppm) | 0.13 | 0.014 | 0.117 | 0.144 | Aqua Regia Digestion | | Al, Aluminium (wt.%) | 3.49 | 0.171 | 3.36 | 3.62 | Aqua Regia Digestion | | As, Arsenic (ppm) | 17.1 | 1.14 | 16.4 | 17.8 | Aqua Regia Digestion | | B, Boron (ppm) | 19.1 | 2.4 | 16.5 | 21.7 | Aqua Regia Digestion | | Ba, Barium (ppm) | 16.7 | 1.59 | 15.5 | 17.9 | Aqua Regia Digestion | | Be, Beryllium (ppm) | 0.19 | 0.018 | 0.17 | 0.22 | Aqua Regia Digestion | | Ca, Calcium (wt.%) | 2.68 | 0.42 | 2.46 | 2.89 | Aqua Regia Digestion | | Cd, Cadmium (ppm) | 0.22 | 0.017 | 0.21 | 0.24 | Aqua Regia Digestion | | Ce, Cerium (ppm) | 7.09 | 0.426 | 6.77 | 7.4 | Aqua Regia Digestion | | Co, Cobalt (ppm) | 30.6 | 1.63 | 29.5 | 31.6 | Aqua Regia Digestion | | Cr, Chromium (ppm) | 12.4 | 1.3 | 11.5 | 13.3 | Aqua Regia Digestion | | Cs, Caesium (ppm) | 0.27 | 0.016 | 0.26 | 0.29 | Aqua Regia Digestion | | Cu, Copper (ppm) | 169 | 8 | 164 | 173 | Aqua Regia Digestion | | Dy, Dysprosium (ppm) | 2.1 | 0.31 | 1.8 | 2.4 | Aqua Regia Digestion | | Er, Erbium (ppm) | 1.2 | 0.14 | 1.05 | 1.35 | Aqua Regia Digestion | | Eu, Europium (ppm) | 0.34 | 0.024 | 0.3 | 0.37 | Aqua Regia Digestion | | Fe, Iron (wt.%) | 5.58 | 0.18 | 5.41 | 5.75 | Aqua Regia Digestion | | Ga, Gallium (ppm) | 10.1 | 1.1 | 9.5 | 10.7 | Aqua Regia Digestion | | Gd, Gadolinium (ppm) | 1.87 | 0.25 | 1.6 | 2.15 | Aqua Regia Digestion | | Ge, Germanium (ppm) | 0.13 | 0.02 | 0.09 | 0.16 | Aqua Regia Digestion | | Hf, Hafnium (ppm) | 0.48 | 0.08 | 0.43 | 0.54 | Aqua Regia Digestion | | Ho, Holmium (ppm) | 0.41 | 0.04 | 0.36 | 0.45 | Aqua Regia Digestion | | In, Indium (ppm) | 0.025 | 0.004 | 0.021 | 0.029 | Aqua Regia Digestion | | K, Potassium (wt.%) | 0.081 | 0.009 | 0.077 | 0.085 | Aqua Regia Digestion | | La, Lanthanum (ppm) | 2.79 | 0.142 | 2.69 | 2.9 | Aqua Regia Digestion | | Li, Lithium (ppm) | 9.45 | 0.672 | 8.96 | 9.94 | Aqua Regia Digestion | | Lu, Lutetium (ppm) | 0.16 | 0.02 | 0.14 | 0.17 | Aqua Regia Digestion | | Mg, Magnesium (wt.%) | 1.69 | 0.046 | 1.66 | 1.72 | Aqua Regia Digestion | | Mn, Manganese (wt.%) | 0.074 | 0.004 | 0.071 | 0.076 | Aqua Regia Digestion | | Mo, Molybdenum (ppm) | 0.64 | 0.042 | 0.59 | 0.69 | Aqua Regia Digestion | | Na, Sodium (wt.%) | 0.102 | 0.009 | 0.094 | 0.111 | Aqua Regia Digestion | | Nd, Neodymium (ppm) | 4.95 | 0.54 | 4.4 | 5.5 | Aqua Regia Digestion | | Ni, Nickel (ppm) | 54 | 2.2 | 52 | 55 | Aqua Regia Digestion | | P, Phosphorus (wt.%) | 0.038 | 0.002 | 0.037 | 0.04 | Aqua Regia Digestion | | Pb, Lead (ppm) | 8.24 | 0.424 | 7.92 | 8.56 | Aqua Regia Digestion | | Pr, Praseodymium (ppm) | 1.04 | 0.11 | 0.93 | 1.15 | Aqua Regia Digestion | | Pt, Platinum (ppb) | 15.4 | 1.4 | 12.9 | 18 | Aqua Regia Digestion | | Rb, Rubidium (ppm) | 2.69 | 0.31 | 2.5 | 2.88 | Aqua Regia Digestion | | Re, Rhenium (ppm) | 0.002 | 0.001 | 0 | 0.003 | Aqua Regia Digestion | | S, Sulphur (wt.%) | 0.187 | 0.012 | 0.176 | 0.197 | Aqua Regia Digestion | | Sb, Antimony (ppm) | 0.32 | 0.08 | 0.27 | 0.37 | Aqua Regia Digestion | | Sc, Scandium (ppm) | 5.56 | 0.57 | 5.15 | 5.97 | Aqua Regia Digestion | | Sm, Samarium (ppm) | 1.38 | 0.066 | 1.28 | 1.48 | Aqua Regia Digestion | | Sn, Tin (ppm) | 0.47 | 0.11 | 0.4 | 0.55 | Aqua Regia Digestion | | Sr, Strontium (ppm) | 36.8 | 5.6 | 33.9 | 39.7 | Aqua Regia Digestion | | Ta, Tantalum (ppm) | 0.01 | IND | IND | IND | Aqua Regia Digestion | | Tb, Terbium (ppm) | 0.31 | 0.03 | 0.28 | 0.34 | Aqua Regia Digestion | | Te, Tellurium (ppm) | 0.049 | 0.009 | 0.032 | 0.067 | Aqua Regia Digestion | | Th, Thorium (ppm) | 0.34 | 0.04 | 0.32 | 0.36 | Aqua Regia Digestion | | Ti, Titanium (wt.%) | 0.333 | 0.064 | 0.3 | 0.365 | Aqua Regia Digestion | | Tm, Thulium (ppm) | 0.17 | 0.014 | 0.15 | 0.19 | Aqua Regia Digestion | | U, Uranium (ppm) | 0.093 | 0.006 | 0.086 | 0.1 | Aqua Regia Digestion | | V, Vanadium (ppm) | 139 | 15 | 130 | 148 | Aqua Regia Digestion | | W, Tungsten (ppm) | 5.44 | 0.86 | 4.95 | 5.94 | Aqua Regia Digestion | | Y, Yttrium (ppm) | 11.6 | 1.03 | 10.9 | 12.2 | Aqua Regia Digestion | | Yb, Ytterbium (ppm) | 1.12 | 0.13 | 0.98 | 1.25 | Aqua Regia Digestion | | Zn, Zinc (ppm) | 85 | 5.3 | 82 | 88 | Aqua Regia Digestion | | Zr, Zirconium (ppm) | 16 | 1.37 | 14.9 | 17.1 | Aqua Regia Digestion | | Au, Gold (ppm) | 0.318 | 0.015 | 0.311 | 0.325 | Aqua Regia Digestion (sample weights 10-50g) | | Au, Gold (ppm) | 0.321 | 0.022 | 0.311 | 0.332 | Cyanide Leach | | Au, Gold (ppm) | 0.337 | 0.013 | 0.331 | 0.342 | Pb Fire Assay | | Au, Gold (ppm) | 0.329 | 0.021 | 0.324 | 0.333 | PhotonAssay |
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