Specifications
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CRM State:
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Matrix:
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Mineralisation:
OREAS 267 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 the states of New South Wales and Victoria, 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 i faulted block of Silurian age Granodiorite, intruded by Permian rhyolitic ignimbrite dykes and vein breccias. Epithermal and mesothermal gold mineralisation occurs within quartz veining, stockworks and breccias associated with Permian rhyolitic volcanic dykes and highly fractured granodiorite.
Thirty-eight commercial analytical laboratories participated in the program to certify the elements reported below using the following methods:
To confirm homogeneity, gold by instrumental neutron activation analysis (INAA) was undertaken on 20 x 85mg. This format enabled a nested ANOVA treatment of the INAA results to compare within- and between-unit variances, providing a statistical measure of batch homogeneity.
Analyte | Certified Value | 1SD | Expanded Uncertainty Low | Expanded Uncertainty High | Method |
---|---|---|---|---|---|
Au, Gold (ppm) | 13.21 | 0.400 | 13.06 | 13.36 | Pb Fire Assay |
Au, Gold (ppm) | 13.56 | 0.284 | 13.46 | 13.66 | PhotonAssay |
Au, Gold (ppm) | 13.42 | 0.526 | 13.14 | 13.69 | Aqua Regia Digestion (sample weights 10-50g) |
Au, Gold (ppm) | 12.96 | 0.643 | 12.65 | 13.26 | Cyanide Leach |
Ag, Silver (ppm) | 5.54 | 0.215 | 5.32 | 5.76 | 4-Acid Digestion |
Al, Aluminium (wt.%) | 5.05 | 0.186 | 4.91 | 5.18 | 4-Acid Digestion |
As, Arsenic (ppm) | 137 | 5 | 131 | 142 | 4-Acid Digestion |
Ba, Barium (ppm) | 381 | 12 | 369 | 393 | 4-Acid Digestion |
Be, Beryllium (ppm) | 1.80 | 0.072 | 1.73 | 1.88 | 4-Acid Digestion |
Bi, Bismuth (ppm) | 1.28 | 0.123 | 1.17 | 1.39 | 4-Acid Digestion |
Ca, Calcium (wt.%) | 1.13 | 0.031 | 1.10 | 1.16 | 4-Acid Digestion |
Ce, Cerium (ppm) | 58 | 3.2 | 55 | 62 | 4-Acid Digestion |
Co, Cobalt (ppm) | 11.0 | 0.26 | 10.6 | 11.5 | 4-Acid Digestion |
Cr, Chromium (ppm) | 98 | 7.1 | 92 | 104 | 4-Acid Digestion |
Cs, Caesium (ppm) | 5.50 | 0.154 | 5.25 | 5.75 | 4-Acid Digestion |
Cu, Copper (ppm) | 23.9 | 1.39 | 22.6 | 25.2 | 4-Acid Digestion |
Dy, Dysprosium (ppm) | 3.07 | 0.092 | 2.87 | 3.27 | 4-Acid Digestion |
Er, Erbium (ppm) | 1.50 | 0.093 | 1.33 | 1.67 | 4-Acid Digestion |
Eu, Europium (ppm) | 1.03 | 0.039 | 0.93 | 1.13 | 4-Acid Digestion |
Fe, Iron (wt.%) | 2.86 | 0.068 | 2.80 | 2.93 | 4-Acid Digestion |
Ga, Gallium (ppm) | 14.5 | 0.74 | 13.7 | 15.3 | 4-Acid Digestion |
Gd, Gadolinium (ppm) | 4.10 | 0.324 | 3.52 | 4.69 | 4-Acid Digestion |
Hf, Hafnium (ppm) | 2.96 | 0.195 | 2.75 | 3.17 | 4-Acid Digestion |
Ho, Holmium (ppm) | 0.56 | 0.029 | 0.51 | 0.62 | 4-Acid Digestion |
In, Indium (ppm) | 0.061 | 0.005 | 0.052 | 0.069 | 4-Acid Digestion |
K, Potassium (wt.%) | 1.25 | 0.023 | 1.22 | 1.27 | 4-Acid Digestion |
La, Lanthanum (ppm) | 31.0 | 1.28 | 29.7 | 32.2 | 4-Acid Digestion |
Li, Lithium (ppm) | 55 | 2.1 | 53 | 57 | 4-Acid Digestion |
Lu, Lutetium (ppm) | 0.20 | 0.007 | 0.18 | 0.22 | 4-Acid Digestion |
Mg, Magnesium (wt.%) | 0.929 | 0.034 | 0.904 | 0.953 | 4-Acid Digestion |
Mn, Manganese (wt.%) | 0.028 | 0.001 | 0.027 | 0.028 | 4-Acid Digestion |
Mo, Molybdenum (ppm) | 6.94 | 0.345 | 6.55 | 7.32 | 4-Acid Digestion |
Na, Sodium (wt.%) | 0.505 | 0.022 | 0.489 | 0.520 | 4-Acid Digestion |
Nb, Niobium (ppm) | 13.9 | 0.98 | 13.0 | 14.7 | 4-Acid Digestion |
Nd, Neodymium (ppm) | 26.7 | 0.85 | 25.1 | 28.2 | 4-Acid Digestion |
Ni, Nickel (ppm) | 48.9 | 2.39 | 46.7 | 51.1 | 4-Acid Digestion |
P, Phosphorus (wt.%) | 0.048 | 0.001 | 0.046 | 0.049 | 4-Acid Digestion |
Pb, Lead (ppm) | 15.2 | 1.50 | 13.9 | 16.5 | 4-Acid Digestion |
Pr, Praseodymium (ppm) | 6.95 | 0.341 | 6.45 | 7.45 | 4-Acid Digestion |
Rb, Rubidium (ppm) | 71 | 2.6 | 68 | 74 | 4-Acid Digestion |
Re, Rhenium (ppm) | < 0.002 | IND | IND | IND | 4-Acid Digestion |
S, Sulphur (wt.%) | 0.024 | 0.004 | 0.023 | 0.026 | 4-Acid Digestion |
Sb, Antimony (ppm) | 5.15 | 1.59 | 4.15 | 6.14 | 4-Acid Digestion |
Sc, Scandium (ppm) | 9.25 | 0.602 | 8.72 | 9.78 | 4-Acid Digestion |
Sm, Samarium (ppm) | 5.11 | 0.186 | 4.72 | 5.49 | 4-Acid Digestion |
Sn, Tin (ppm) | 5.95 | 0.288 | 5.56 | 6.34 | 4-Acid Digestion |
Sr, Strontium (ppm) | 159 | 4 | 155 | 163 | 4-Acid Digestion |
Ta, Tantalum (ppm) | 0.93 | 0.037 | 0.87 | 0.99 | 4-Acid Digestion |
Tb, Terbium (ppm) | 0.54 | 0.016 | 0.52 | 0.57 | 4-Acid Digestion |
Te, Tellurium (ppm) | 0.068 | 0.011 | 0.038 | 0.098 | 4-Acid Digestion |
Th, Thorium (ppm) | 9.13 | 0.340 | 8.74 | 9.53 | 4-Acid Digestion |
Ti, Titanium (wt.%) | 0.373 | 0.013 | 0.361 | 0.385 | 4-Acid Digestion |
Tl, Thallium (ppm) | 0.39 | 0.025 | 0.37 | 0.42 | 4-Acid Digestion |
U, Uranium (ppm) | 1.93 | 0.121 | 1.81 | 2.05 | 4-Acid Digestion |
V, Vanadium (ppm) | 68 | 1.9 | 66 | 70 | 4-Acid Digestion |
W, Tungsten (ppm) | 7.32 | 0.360 | 6.99 | 7.65 | 4-Acid Digestion |
Y, Yttrium (ppm) | 14.0 | 0.70 | 13.2 | 14.8 | 4-Acid Digestion |
Yb, Ytterbium (ppm) | 1.38 | 0.070 | 1.26 | 1.49 | 4-Acid Digestion |
Zn, Zinc (ppm) | 43.4 | 1.60 | 41.8 | 45.1 | 4-Acid Digestion |
Zr, Zirconium (ppm) | 112 | 3 | 107 | 118 | 4-Acid Digestion |
Ag, Silver (ppm) | 5.35 | 0.180 | 5.16 | 5.54 | Aqua Regia Digestion |
Al, Aluminium (wt.%) | 0.879 | 0.080 | 0.820 | 0.938 | Aqua Regia Digestion |
As, Arsenic (ppm) | 112 | 4 | 107 | 116 | Aqua Regia Digestion |
Ba, Barium (ppm) | 71 | 9 | 67 | 76 | Aqua Regia Digestion |
Be, Beryllium (ppm) | 0.52 | 0.018 | 0.49 | 0.55 | Aqua Regia Digestion |
Bi, Bismuth (ppm) | 1.03 | 0.085 | 0.94 | 1.13 | Aqua Regia Digestion |
Ca, Calcium (wt.%) | 0.279 | 0.024 | 0.262 | 0.296 | Aqua Regia Digestion |
Ce, Cerium (ppm) | 31.9 | 2.61 | 29.7 | 34.0 | Aqua Regia Digestion |
Co, Cobalt (ppm) | 7.02 | 0.582 | 6.53 | 7.50 | Aqua Regia Digestion |
Cr, Chromium (ppm) | 46.8 | 2.09 | 44.8 | 48.7 | Aqua Regia Digestion |
Cs, Caesium (ppm) | 1.18 | 0.057 | 1.13 | 1.24 | Aqua Regia Digestion |
Cu, Copper (ppm) | 19.7 | 1.10 | 18.7 | 20.7 | Aqua Regia Digestion |
Fe, Iron (wt.%) | 2.02 | 0.094 | 1.94 | 2.11 | Aqua Regia Digestion |
Ga, Gallium (ppm) | 3.71 | 0.43 | 3.41 | 4.02 | Aqua Regia Digestion |
Hf, Hafnium (ppm) | 0.48 | 0.05 | 0.44 | 0.53 | Aqua Regia Digestion |
Hg, Mercury (ppm) | 0.043 | 0.008 | 0.030 | 0.055 | Aqua Regia Digestion |
In, Indium (ppm) | 0.020 | 0.002 | 0.017 | 0.024 | Aqua Regia Digestion |
K, Potassium (wt.%) | 0.158 | 0.020 | 0.144 | 0.172 | Aqua Regia Digestion |
La, Lanthanum (ppm) | 15.2 | 1.30 | 14.1 | 16.2 | Aqua Regia Digestion |
Li, Lithium (ppm) | 5.56 | 0.60 | 5.10 | 6.01 | Aqua Regia Digestion |
Mg, Magnesium (wt.%) | 0.371 | 0.022 | 0.353 | 0.389 | Aqua Regia Digestion |
Mn, Manganese (wt.%) | 0.015 | 0.001 | 0.014 | 0.015 | Aqua Regia Digestion |
Mo, Molybdenum (ppm) | 5.89 | 0.235 | 5.69 | 6.09 | Aqua Regia Digestion |
Na, Sodium (wt.%) | 0.083 | 0.012 | 0.072 | 0.093 | Aqua Regia Digestion |
Nb, Niobium (ppm) | 0.35 | 0.07 | 0.29 | 0.41 | Aqua Regia Digestion |
Ni, Nickel (ppm) | 39.6 | 2.59 | 37.3 | 42.0 | Aqua Regia Digestion |
P, Phosphorus (wt.%) | 0.032 | 0.001 | 0.030 | 0.033 | Aqua Regia Digestion |
Pb, Lead (ppm) | 8.60 | 0.92 | 7.91 | 9.30 | Aqua Regia Digestion |
Rb, Rubidium (ppm) | 11.2 | 0.91 | 10.4 | 12.1 | Aqua Regia Digestion |
Re, Rhenium (ppm) | < 0.001 | IND | IND | IND | Aqua Regia Digestion |
S, Sulphur (wt.%) | 0.022 | 0.004 | 0.020 | 0.024 | Aqua Regia Digestion |
Sc, Scandium (ppm) | 2.23 | 0.198 | 1.99 | 2.47 | Aqua Regia Digestion |
Sn, Tin (ppm) | 1.18 | 0.16 | 1.01 | 1.34 | Aqua Regia Digestion |
Sr, Strontium (ppm) | 30.6 | 3.1 | 28.2 | 33.1 | Aqua Regia Digestion |
Ta, Tantalum (ppm) | < 0.010 | IND | IND | IND | Aqua Regia Digestion |
Te, Tellurium (ppm) | 0.053 | 0.011 | 0.032 | 0.075 | Aqua Regia Digestion |
Th, Thorium (ppm) | 5.96 | 0.328 | 5.65 | 6.28 | Aqua Regia Digestion |
Ti, Titanium (wt.%) | 0.060 | 0.011 | 0.053 | 0.067 | Aqua Regia Digestion |
Tl, Thallium (ppm) | 0.090 | 0.013 | 0.079 | 0.101 | Aqua Regia Digestion |
U, Uranium (ppm) | 0.90 | 0.035 | 0.85 | 0.95 | Aqua Regia Digestion |
V, Vanadium (ppm) | 20.8 | 0.75 | 19.7 | 21.9 | Aqua Regia Digestion |
W, Tungsten (ppm) | 1.81 | 0.25 | 1.57 | 2.06 | Aqua Regia Digestion |
Y, Yttrium (ppm) | 6.29 | 0.463 | 5.92 | 6.66 | Aqua Regia Digestion |
Zn, Zinc (ppm) | 23.5 | 2.34 | 21.8 | 25.2 | Aqua Regia Digestion |
Zr, Zirconium (ppm) | 21.3 | 1.03 | 20.2 | 22.3 | Aqua Regia Digestion |