OREAS 268
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Description
Description
OREAS 268 was prepared from a blend of high-grade oxide gold ore and barren materials (basaltic scoria and oxidised siliciclastic sediments). The scoria and sediments were sourced from quarries located in New South Wales and Victoria in Australia. The gold ore was sourced from the Agate Creek Gold Project located in the Etheridge Goldfield of northern Queensland, Australia. The project is hosted within a metamorphosed turbidite sequence of interbedded sandstones, siltstones and shales. Epithermal and mesothermal gold mineralisation occurs within quartz veining, stockworks and breccias associated with Permian felsic volcanic units and Proterozoic batholith. Thirty-one commercial analytical laboratories participated in the program to certify the elements reported below.
- Gold by fire assay (25-50g charge weight) with AAS and ICP-OES finish;
- Gold by aqua regia digestion (15-50g sample weight) with ICP-OES and/or ICP-MS finish;
- Gold by cyanide leach (20-200g) with AAS or ICP-MS finish;
- Gold by x-ray photon assay on ~350g sample weights (12 Chrysos PhotonAssay units at 7 laboratories with two rounds of data reported from each unit);
- Full ICP-OES and ICP-MS elemental suites by 4-acid digestion;
- Full ICP-OES and ICP-MS elemental suites by aqua regia digestion.
To confirm homogeneity, gold by instrumental neutron activation analysis (INAA) was undertaken on 20 x 85mg subsamples (see Table 6 in the ‘Homogeneity Evaluation’ section of the Certificate).
|
Analyte
|
Certified Value
|
1SD
|
Expanded Uncertainty Low
|
Expanded Uncertainty High
|
Method
|
|---|---|---|---|---|---|
| Au, Gold (ppm) | 11.42 | 0.332 | 11.28 | 11.56 | Pb Fire Assay |
| Au, Gold (ppm) | 11.67 | 0.214 | 11.58 | 11.76 | PhotonAssay |
| Au, Gold (ppm) | 11.29 | 0.519 | 11.07 | 11.51 | Aqua Regia Digestion (sample weights 10-50g) |
| Au, Gold (ppm) | 11.17 | 0.277 | 11.05 | 11.29 | Cyanide Leach |
| Ag, Silver (ppm) | 4.86 | 0.211 | 4.62 | 5.09 | 4-Acid Digestion |
| Al, Aluminium (wt.%) | 5.18 | 0.162 | 5.05 | 5.31 | 4-Acid Digestion |
| As, Arsenic (ppm) | 134 | 4 | 130 | 139 | 4-Acid Digestion |
| Ba, Barium (ppm) | 385 | 12 | 374 | 397 | 4-Acid Digestion |
| Be, Beryllium (ppm) | 1.92 | 0.135 | 1.77 | 2.07 | 4-Acid Digestion |
| Bi, Bismuth (ppm) | 5.31 | 0.385 | 4.86 | 5.75 | 4-Acid Digestion |
| Ca, Calcium (wt.%) | 1.18 | 0.046 | 1.14 | 1.22 | 4-Acid Digestion |
| Cd, Cadmium (ppm) | 0.041 | 0.014 | 0.025 | 0.056 | 4-Acid Digestion |
| Ce, Cerium (ppm) | 61 | 2.6 | 59 | 64 | 4-Acid Digestion |
| Co, Cobalt (ppm) | 11.1 | 0.43 | 10.5 | 11.7 | 4-Acid Digestion |
| Cr, Chromium (ppm) | 94 | 7.9 | 87 | 100 | 4-Acid Digestion |
| Cs, Caesium (ppm) | 6.05 | 0.270 | 5.79 | 6.32 | 4-Acid Digestion |
| Cu, Copper (ppm) | 27.1 | 1.22 | 25.7 | 28.5 | 4-Acid Digestion |
| Dy, Dysprosium (ppm) | 3.14 | 0.147 | 2.95 | 3.34 | 4-Acid Digestion |
| Er, Erbium (ppm) | 1.52 | 0.129 | 1.39 | 1.65 | 4-Acid Digestion |
| Eu, Europium (ppm) | 1.03 | 0.074 | 0.94 | 1.12 | 4-Acid Digestion |
| Fe, Iron (wt.%) | 2.95 | 0.088 | 2.86 | 3.05 | 4-Acid Digestion |
| Ga, Gallium (ppm) | 15.0 | 0.62 | 14.3 | 15.6 | 4-Acid Digestion |
| Gd, Gadolinium (ppm) | 4.15 | 0.156 | 3.82 | 4.48 | 4-Acid Digestion |
| Ge, Germanium (ppm) | 0.15 | 0.05 | 0.10 | 0.21 | 4-Acid Digestion |
| Hf, Hafnium (ppm) | 3.11 | 0.141 | 2.93 | 3.29 | 4-Acid Digestion |
| Ho, Holmium (ppm) | 0.56 | 0.040 | 0.48 | 0.63 | 4-Acid Digestion |
| In, Indium (ppm) | 0.063 | 0.005 | 0.054 | 0.072 | 4-Acid Digestion |
| K, Potassium (wt.%) | 1.30 | 0.057 | 1.26 | 1.34 | 4-Acid Digestion |
| La, Lanthanum (ppm) | 31.3 | 1.50 | 29.8 | 32.8 | 4-Acid Digestion |
| Li, Lithium (ppm) | 56 | 3.1 | 54 | 59 | 4-Acid Digestion |
| Lu, Lutetium (ppm) | 0.21 | 0.016 | 0.19 | 0.24 | 4-Acid Digestion |
| Mg, Magnesium (wt.%) | 0.990 | 0.052 | 0.958 | 1.022 | 4-Acid Digestion |
| Mn, Manganese (wt.%) | 0.028 | 0.001 | 0.027 | 0.029 | 4-Acid Digestion |
| Mo, Molybdenum (ppm) | 7.19 | 0.436 | 6.74 | 7.65 | 4-Acid Digestion |
| Na, Sodium (wt.%) | 0.543 | 0.020 | 0.524 | 0.562 | 4-Acid Digestion |
| Nb, Niobium (ppm) | 15.2 | 1.14 | 14.2 | 16.2 | 4-Acid Digestion |
| Nd, Neodymium (ppm) | 27.0 | 0.84 | 25.5 | 28.4 | 4-Acid Digestion |
| Ni, Nickel (ppm) | 50 | 2.3 | 48 | 52 | 4-Acid Digestion |
| P, Phosphorus (wt.%) | 0.053 | 0.002 | 0.052 | 0.055 | 4-Acid Digestion |
| Pb, Lead (ppm) | 15.5 | 1.12 | 14.4 | 16.6 | 4-Acid Digestion |
| Pr, Praseodymium (ppm) | 7.22 | 0.229 | 6.85 | 7.60 | 4-Acid Digestion |
| Rb, Rubidium (ppm) | 77 | 3.3 | 74 | 80 | 4-Acid Digestion |
| Re, Rhenium (ppm) | < 0.002 | IND | IND | IND | 4-Acid Digestion |
| S, Sulphur (wt.%) | 0.028 | 0.004 | 0.022 | 0.034 | 4-Acid Digestion |
| Sb, Antimony (ppm) | 4.83 | 0.244 | 4.61 | 5.06 | 4-Acid Digestion |
| Sc, Scandium (ppm) | 9.23 | 0.467 | 8.76 | 9.70 | 4-Acid Digestion |
| Se, Selenium (ppm) | 0.95 | 0.21 | 0.61 | 1.28 | 4-Acid Digestion |
| Sm, Samarium (ppm) | 5.12 | 0.148 | 4.82 | 5.41 | 4-Acid Digestion |
| Sn, Tin (ppm) | 6.51 | 0.409 | 6.09 | 6.93 | 4-Acid Digestion |
| Sr, Strontium (ppm) | 170 | 4 | 166 | 175 | 4-Acid Digestion |
| Ta, Tantalum (ppm) | 1.04 | 0.092 | 0.95 | 1.12 | 4-Acid Digestion |
| Tb, Terbium (ppm) | 0.54 | 0.036 | 0.51 | 0.57 | 4-Acid Digestion |
| Te, Tellurium (ppm) | 0.12 | 0.03 | 0.07 | 0.18 | 4-Acid Digestion |
| Th, Thorium (ppm) | 9.36 | 0.489 | 8.88 | 9.84 | 4-Acid Digestion |
| Ti, Titanium (wt.%) | 0.393 | 0.017 | 0.376 | 0.410 | 4-Acid Digestion |
| Tl, Thallium (ppm) | 0.46 | 0.028 | 0.44 | 0.48 | 4-Acid Digestion |
| Tm, Thulium (ppm) | 0.20 | 0.010 | 0.19 | 0.21 | 4-Acid Digestion |
| U, Uranium (ppm) | 1.82 | 0.086 | 1.72 | 1.93 | 4-Acid Digestion |
| V, Vanadium (ppm) | 69 | 2.2 | 66 | 72 | 4-Acid Digestion |
| W, Tungsten (ppm) | 25.2 | 1.26 | 23.4 | 27.0 | 4-Acid Digestion |
| Y, Yttrium (ppm) | 13.7 | 0.91 | 12.9 | 14.5 | 4-Acid Digestion |
| Yb, Ytterbium (ppm) | 1.36 | 0.100 | 1.24 | 1.49 | 4-Acid Digestion |
| Zn, Zinc (ppm) | 47.8 | 2.37 | 45.7 | 49.9 | 4-Acid Digestion |
| Zr, Zirconium (ppm) | 113 | 6 | 108 | 118 | 4-Acid Digestion |
| Ag, Silver (ppm) | 4.65 | 0.132 | 4.48 | 4.81 | Aqua Regia Digestion |
| Al, Aluminium (wt.%) | 0.918 | 0.067 | 0.874 | 0.961 | Aqua Regia Digestion |
| As, Arsenic (ppm) | 116 | 4 | 111 | 120 | Aqua Regia Digestion |
| B, Boron (ppm) | < 10.0 | IND | IND | IND | Aqua Regia Digestion |
| Ba, Barium (ppm) | 79 | 7.4 | 74 | 84 | Aqua Regia Digestion |
| Be, Beryllium (ppm) | 0.56 | 0.032 | 0.53 | 0.60 | Aqua Regia Digestion |
| Bi, Bismuth (ppm) | 4.70 | 0.327 | 4.36 | 5.04 | Aqua Regia Digestion |
| Ca, Calcium (wt.%) | 0.332 | 0.025 | 0.315 | 0.350 | Aqua Regia Digestion |
| Cd, Cadmium (ppm) | 0.031 | 0.007 | 0.017 | 0.046 | Aqua Regia Digestion |
| Ce, Cerium (ppm) | 35.2 | 3.20 | 32.9 | 37.5 | Aqua Regia Digestion |
| Co, Cobalt (ppm) | 7.22 | 0.79 | 6.70 | 7.73 | Aqua Regia Digestion |
| Cr, Chromium (ppm) | 43.7 | 2.21 | 42.0 | 45.4 | Aqua Regia Digestion |
| Cs, Caesium (ppm) | 1.39 | 0.18 | 1.25 | 1.53 | Aqua Regia Digestion |
| Cu, Copper (ppm) | 22.8 | 1.38 | 21.5 | 24.0 | Aqua Regia Digestion |
| Eu, Europium (ppm) | 0.53 | 0.10 | 0.38 | 0.69 | Aqua Regia Digestion |
| Fe, Iron (wt.%) | 2.14 | 0.148 | 2.03 | 2.24 | Aqua Regia Digestion |
| Ga, Gallium (ppm) | 3.64 | 0.256 | 3.41 | 3.86 | Aqua Regia Digestion |
| Ge, Germanium (ppm) | 0.079 | 0.028 | 0.046 | 0.112 | Aqua Regia Digestion |
| Hf, Hafnium (ppm) | 0.51 | 0.07 | 0.45 | 0.57 | Aqua Regia Digestion |
| Hg, Mercury (ppm) | 0.042 | 0.013 | 0.021 | 0.064 | Aqua Regia Digestion |
| Ho, Holmium (ppm) | 0.25 | 0.04 | 0.19 | 0.31 | Aqua Regia Digestion |
| In, Indium (ppm) | 0.024 | 0.003 | 0.020 | 0.027 | Aqua Regia Digestion |
| K, Potassium (wt.%) | 0.169 | 0.021 | 0.155 | 0.182 | Aqua Regia Digestion |
| La, Lanthanum (ppm) | 17.1 | 1.9 | 15.9 | 18.3 | Aqua Regia Digestion |
| Li, Lithium (ppm) | 5.60 | 0.73 | 5.02 | 6.18 | Aqua Regia Digestion |
| Mg, Magnesium (wt.%) | 0.400 | 0.022 | 0.385 | 0.415 | Aqua Regia Digestion |
| Mn, Manganese (wt.%) | 0.016 | 0.001 | 0.015 | 0.016 | Aqua Regia Digestion |
| Mo, Molybdenum (ppm) | 6.53 | 0.421 | 6.23 | 6.83 | Aqua Regia Digestion |
| Na, Sodium (wt.%) | 0.090 | 0.007 | 0.081 | 0.098 | Aqua Regia Digestion |
| Nb, Niobium (ppm) | 0.43 | 0.12 | 0.32 | 0.54 | Aqua Regia Digestion |
| Ni, Nickel (ppm) | 40.3 | 1.98 | 38.4 | 42.2 | Aqua Regia Digestion |
| P, Phosphorus (wt.%) | 0.036 | 0.002 | 0.034 | 0.037 | Aqua Regia Digestion |
| Pb, Lead (ppm) | 8.83 | 0.90 | 8.27 | 9.40 | Aqua Regia Digestion |
| Pr, Praseodymium (ppm) | 4.31 | 0.78 | 3.21 | 5.40 | Aqua Regia Digestion |
| Rb, Rubidium (ppm) | 12.9 | 0.66 | 12.3 | 13.6 | Aqua Regia Digestion |
| Re, Rhenium (ppm) | < 0.001 | IND | IND | IND | Aqua Regia Digestion |
| S, Sulphur (wt.%) | 0.022 | 0.003 | 0.020 | 0.024 | Aqua Regia Digestion |
| Sb, Antimony (ppm) | 1.82 | 0.21 | 1.67 | 1.96 | Aqua Regia Digestion |
| Sc, Scandium (ppm) | 2.19 | 0.192 | 2.05 | 2.34 | Aqua Regia Digestion |
| Sn, Tin (ppm) | 1.36 | 0.25 | 1.17 | 1.55 | Aqua Regia Digestion |
| Sr, Strontium (ppm) | 35.4 | 4.2 | 32.9 | 37.9 | Aqua Regia Digestion |
| Ta, Tantalum (ppm) | < 0.010 | IND | IND | IND | Aqua Regia Digestion |
| Tb, Terbium (ppm) | 0.29 | 0.021 | 0.26 | 0.33 | Aqua Regia Digestion |
| Te, Tellurium (ppm) | 0.089 | 0.014 | 0.067 | 0.112 | Aqua Regia Digestion |
| Th, Thorium (ppm) | 6.26 | 0.576 | 5.89 | 6.64 | Aqua Regia Digestion |
| Ti, Titanium (wt.%) | 0.066 | 0.010 | 0.060 | 0.072 | Aqua Regia Digestion |
| Tl, Thallium (ppm) | 0.11 | 0.01 | 0.09 | 0.12 | Aqua Regia Digestion |
| U, Uranium (ppm) | 0.89 | 0.054 | 0.85 | 0.94 | Aqua Regia Digestion |
| V, Vanadium (ppm) | 20.2 | 1.05 | 19.0 | 21.3 | Aqua Regia Digestion |
| W, Tungsten (ppm) | 8.54 | 1.33 | 7.65 | 9.43 | Aqua Regia Digestion |
| Y, Yttrium (ppm) | 6.43 | 0.203 | 6.12 | 6.74 | Aqua Regia Digestion |
| Zn, Zinc (ppm) | 28.9 | 3.2 | 26.8 | 31.1 | Aqua Regia Digestion |
| Zr, Zirconium (ppm) | 22.9 | 1.96 | 21.4 | 24.5 | Aqua Regia Digestion |
