OREAS 250c
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Description
Description
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 |
