OREAS 250c

OREAS 250c was prepared from a blend of gold-bearing oxide ores and barren materials (basaltic scoria, quartz and mudstone). The ores were sourced from both the Magdala ore deposit (Stawell Gold Mine) located in west-central Victoria, Australia and the Wilber Lode (Andy Well Mine) located approximately 45km north of Meekatharra in the Murchison region of Western Australia. Primary mineralisation in the Magdala ore consists of a quartz-sericite-carbonate schist assemblage containing the sulphides arsenopyrite, pyrrhotite and pyrite. The Wilber Lode contains a common primary mineral assemblage of quartz, calcite, chlorite, fuchsite, pyrite, galena, sphalerite, chalcopyrite and gold. Thirty-three commercial analytical laboratories participated in the program to certify:

  • Gold by fire assay;
  • Gold by 15-50g aqua regia digestion;
  • Gold by 5-200g cyanide leach;
  • Gold by PhotonAssay;
  • Full ICP-OES and ICP-MS elemental suites by 4-acid digestion;
  • Full ICP-OES and ICP-MS elemental suites by aqua regia digestion.
Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
Au, Gold (ppm) 0.313 0.015 0.306 0.319 Pb Fire Assay
Au, Gold (ppm) 0.313 0.018 0.305 0.321 Aqua Regia Digestion (sample weights 10-50g)
Au, Gold (ppm) 0.295 0.016 0.287 0.303 Cyanide Leach
Au, Gold (ppm) 0.311 0.027 0.302 0.320 PhotonAssay
Ag, Silver (ppm) < 0.100 IND IND IND 4-Acid Digestion
Al, Aluminium (wt.%) 5.18 0.101 5.04 5.31 4-Acid Digestion
As, Arsenic (ppm) 54 2.2 51 57 4-Acid Digestion
Ba, Barium (ppm) 354 7 342 366 4-Acid Digestion
Be, Beryllium (ppm) 1.97 0.087 1.89 2.05 4-Acid Digestion
Bi, Bismuth (ppm) 0.29 0.03 0.26 0.32 4-Acid Digestion
Ca, Calcium (wt.%) 1.72 0.060 1.66 1.77 4-Acid Digestion
Cd, Cadmium (ppm) 0.075 0.018 0.044 0.105 4-Acid Digestion
Ce, Cerium (ppm) 70 3.1 67 74 4-Acid Digestion
Co, Cobalt (ppm) 20.6 1.32 19.5 21.7 4-Acid Digestion
Cr, Chromium (ppm) 100 6 95 106 4-Acid Digestion
Cs, Caesium (ppm) 2.62 0.111 2.48 2.75 4-Acid Digestion
Cu, Copper (ppm) 24.1 2.18 22.7 25.6 4-Acid Digestion
Dy, Dysprosium (ppm) 3.67 0.204 3.34 3.99 4-Acid Digestion
Er, Erbium (ppm) 1.59 0.107 1.44 1.75 4-Acid Digestion
Eu, Europium (ppm) 1.60 0.060 1.45 1.75 4-Acid Digestion
Fe, Iron (wt.%) 4.04 0.136 3.90 4.17 4-Acid Digestion
Ga, Gallium (ppm) 15.3 1.12 14.2 16.4 4-Acid Digestion
Gd, Gadolinium (ppm) 5.20 0.256 4.67 5.74 4-Acid Digestion
Hf, Hafnium (ppm) 4.34 0.289 4.08 4.61 4-Acid Digestion
Ho, Holmium (ppm) 0.63 0.035 0.57 0.68 4-Acid Digestion
In, Indium (ppm) 0.059 0.004 0.049 0.068 4-Acid Digestion
K, Potassium (wt.%) 1.32 0.052 1.27 1.36 4-Acid Digestion
La, Lanthanum (ppm) 38.0 1.74 35.8 40.2 4-Acid Digestion
Li, Lithium (ppm) 21.7 1.07 20.7 22.8 4-Acid Digestion
Lu, Lutetium (ppm) 0.18 0.02 0.14 0.21 4-Acid Digestion
Mg, Magnesium (wt.%) 1.55 0.050 1.50 1.61 4-Acid Digestion
Mn, Manganese (wt.%) 0.049 0.001 0.047 0.051 4-Acid Digestion
Mo, Molybdenum (ppm) 1.96 0.167 1.81 2.12 4-Acid Digestion
Na, Sodium (wt.%) 1.07 0.023 1.04 1.11 4-Acid Digestion
Nb, Niobium (ppm) 31.8 1.77 30.1 33.5 4-Acid Digestion
Nd, Neodymium (ppm) 32.1 1.70 29.0 35.2 4-Acid Digestion
Ni, Nickel (ppm) 83 4.0 80 87 4-Acid Digestion
P, Phosphorus (wt.%) 0.095 0.003 0.092 0.099 4-Acid Digestion
Pb, Lead (ppm) 9.92 0.915 9.09 10.75 4-Acid Digestion
Pr, Praseodymium (ppm) 8.51 0.465 7.73 9.29 4-Acid Digestion
Rb, Rubidium (ppm) 65 3.8 61 68 4-Acid Digestion
Re, Rhenium (ppm) < 0.002 IND IND IND 4-Acid Digestion
S, Sulphur (wt.%) 0.027 0.004 0.025 0.030 4-Acid Digestion
Sb, Antimony (ppm) 0.88 0.068 0.81 0.96 4-Acid Digestion
Sc, Scandium (ppm) 9.89 0.624 9.33 10.45 4-Acid Digestion
Sm, Samarium (ppm) 6.27 0.336 5.82 6.72 4-Acid Digestion
Sn, Tin (ppm) 3.59 0.166 3.37 3.82 4-Acid Digestion
Sr, Strontium (ppm) 311 8 300 323 4-Acid Digestion
Ta, Tantalum (ppm) 2.07 0.175 1.92 2.23 4-Acid Digestion
Tb, Terbium (ppm) 0.69 0.018 0.65 0.73 4-Acid Digestion
Th, Thorium (ppm) 8.68 0.344 8.23 9.12 4-Acid Digestion
Ti, Titanium (wt.%) 0.567 0.014 0.548 0.586 4-Acid Digestion
Tl, Thallium (ppm) 0.35 0.018 0.33 0.38 4-Acid Digestion
Tm, Thulium (ppm) 0.20 0.013 0.18 0.22 4-Acid Digestion
U, Uranium (ppm) 1.62 0.107 1.51 1.73 4-Acid Digestion
V, Vanadium (ppm) 70 2.6 67 72 4-Acid Digestion
W, Tungsten (ppm) 2.05 0.137 1.90 2.21 4-Acid Digestion
Y, Yttrium (ppm) 15.7 0.96 14.6 16.7 4-Acid Digestion
Yb, Ytterbium (ppm) 1.28 0.063 1.15 1.42 4-Acid Digestion
Zn, Zinc (ppm) 75 3.3 72 78 4-Acid Digestion
Zr, Zirconium (ppm) 188 10 179 196 4-Acid Digestion
Ag, Silver (ppm) 0.079 0.008 0.067 0.091 Aqua Regia Digestion
Al, Aluminium (wt.%) 1.64 0.122 1.56 1.73 Aqua Regia Digestion
As, Arsenic (ppm) 43.4 1.33 42.0 44.9 Aqua Regia Digestion
B, Boron (ppm) < 10.0 IND IND IND Aqua Regia Digestion
Ba, Barium (ppm) 95 5.0 89 100 Aqua Regia Digestion
Be, Beryllium (ppm) 1.08 0.069 1.01 1.14 Aqua Regia Digestion
Bi, Bismuth (ppm) 0.26 0.021 0.25 0.28 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.524 0.041 0.493 0.555 Aqua Regia Digestion
Cd, Cadmium (ppm) 0.067 0.023 0.048 0.087 Aqua Regia Digestion
Ce, Cerium (ppm) 40.9 1.87 39.2 42.5 Aqua Regia Digestion
Co, Cobalt (ppm) 15.9 0.71 15.1 16.7 Aqua Regia Digestion
Cr, Chromium (ppm) 45.9 5.4 42.4 49.4 Aqua Regia Digestion
Cs, Caesium (ppm) 1.13 0.093 1.05 1.20 Aqua Regia Digestion
Cu, Copper (ppm) 18.9 2.2 17.6 20.2 Aqua Regia Digestion
Fe, Iron (wt.%) 3.01 0.263 2.85 3.16 Aqua Regia Digestion
Ga, Gallium (ppm) 5.97 0.521 5.49 6.44 Aqua Regia Digestion
Ge, Germanium (ppm) 0.100 0.017 0.076 0.123 Aqua Regia Digestion
In, Indium (ppm) 0.025 0.003 0.019 0.032 Aqua Regia Digestion
K, Potassium (wt.%) 0.335 0.025 0.317 0.353 Aqua Regia Digestion
La, Lanthanum (ppm) 23.2 0.97 22.3 24.0 Aqua Regia Digestion
Li, Lithium (ppm) 7.61 0.628 7.12 8.10 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.989 0.069 0.942 1.035 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.033 0.002 0.032 0.035 Aqua Regia Digestion
Mo, Molybdenum (ppm) 1.32 0.118 1.23 1.42 Aqua Regia Digestion
Na, Sodium (wt.%) 0.351 0.022 0.331 0.370 Aqua Regia Digestion
Nb, Niobium (ppm) 0.59 0.09 0.48 0.69 Aqua Regia Digestion
Ni, Nickel (ppm) 73 3.4 70 75 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.058 0.004 0.056 0.061 Aqua Regia Digestion
Pb, Lead (ppm) 7.08 0.556 6.66 7.50 Aqua Regia Digestion
Rb, Rubidium (ppm) 19.1 1.16 18.1 20.1 Aqua Regia Digestion
Re, Rhenium (ppm) < 0.001 IND IND IND Aqua Regia Digestion
S, Sulphur (wt.%) 0.024 0.004 0.020 0.028 Aqua Regia Digestion
Sb, Antimony (ppm) 0.45 0.06 0.40 0.49 Aqua Regia Digestion
Sc, Scandium (ppm) 3.74 0.314 3.51 3.97 Aqua Regia Digestion
Sn, Tin (ppm) 1.24 0.13 1.12 1.36 Aqua Regia Digestion
Sr, Strontium (ppm) 63 2.6 61 66 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.010 IND IND IND Aqua Regia Digestion
Tb, Terbium (ppm) 0.45 0.034 0.40 0.49 Aqua Regia Digestion
Th, Thorium (ppm) 5.85 0.247 5.49 6.21 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.162 0.013 0.151 0.174 Aqua Regia Digestion
Tl, Thallium (ppm) 0.14 0.02 0.12 0.15 Aqua Regia Digestion
U, Uranium (ppm) 0.97 0.079 0.89 1.04 Aqua Regia Digestion
V, Vanadium (ppm) 33.7 1.83 32.1 35.3 Aqua Regia Digestion
W, Tungsten (ppm) 0.38 0.038 0.33 0.44 Aqua Regia Digestion
Y, Yttrium (ppm) 9.10 0.386 8.74 9.46 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.63 0.040 0.55 0.71 Aqua Regia Digestion
Zn, Zinc (ppm) 46.4 4.7 43.8 49.0 Aqua Regia Digestion
Zr, Zirconium (ppm) 37.1 8.6 28.7 45.6 Aqua Regia Digestion
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