Specifications
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CRM State:
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Matrix:
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Mineralisation:
OREAS 905b was prepared from a blend of copper and gold oxide ores and barren weathered rhyodacite. The copper ore was sourced from a copper-rich zone within MMG’s VMS Gossan Hill deposit at Golden Grove (Western Australia, AU). The gold ores were sourced from the Stawell Gold Mine (Victoria, AU) and Agate Creek Mine (Queensland, AU). The rhyodacite was sourced from a quarry approximately 30km east of Melbourne, Australia.
Twenty-eight commercial analytical laboratories participated in the program using the following methods:
Instrumental neutron activation analysis for Au on 20 x 85mg subsamples was also undertaken at ANSTO, Lucas Heights to confirm homogeneity.
Analyte | Certified Value | 1SD | Expanded Uncertainty Low | Expanded Uncertainty High | Method |
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Cu, Copper (wt.%) | 0.144 | 0.003 | 0.140 | 0.148 | 4-Acid Digestion |
Cu-Sol(H2SO4), Copper soluble (sulphuric) (wt.%) | 0.121 | 0.004 | 0.118 | 0.124 | Sequential Leach |
Au, Gold (ppm) | 0.381 | 0.011 | 0.376 | 0.385 | Pb Fire Assay |
Au, Gold (ppm) | 0.380 | 0.019 | 0.372 | 0.389 | Aqua Regia Digestion (sample weights 10-50g) |
Ag, Silver (ppm) | 0.600 | 0.062 | 0.544 | 0.656 | 4-Acid Digestion |
Al, Aluminium (wt.%) | 7.50 | 0.259 | 7.27 | 7.73 | 4-Acid Digestion |
As, Arsenic (ppm) | 32.4 | 1.56 | 30.9 | 34.0 | 4-Acid Digestion |
Ba, Barium (ppm) | 2711 | 137 | 2614 | 2807 | 4-Acid Digestion |
Be, Beryllium (ppm) | 3.00 | 0.238 | 2.81 | 3.18 | 4-Acid Digestion |
Bi, Bismuth (ppm) | 4.46 | 0.270 | 4.22 | 4.69 | 4-Acid Digestion |
Ca, Calcium (wt.%) | 1.16 | 0.064 | 1.11 | 1.21 | 4-Acid Digestion |
Cd, Cadmium (ppm) | 0.46 | 0.05 | 0.41 | 0.50 | 4-Acid Digestion |
Ce, Cerium (ppm) | 97 | 5.0 | 91 | 102 | 4-Acid Digestion |
Co, Cobalt (ppm) | 10.6 | 0.63 | 10.0 | 11.2 | 4-Acid Digestion |
Cr, Chromium (ppm) | 17.2 | 2.5 | 15.3 | 19.2 | 4-Acid Digestion |
Cs, Caesium (ppm) | 6.14 | 0.220 | 5.89 | 6.38 | 4-Acid Digestion |
Dy, Dysprosium (ppm) | 3.84 | 0.243 | 3.55 | 4.12 | 4-Acid Digestion |
Er, Erbium (ppm) | 1.12 | 0.075 | 1.00 | 1.24 | 4-Acid Digestion |
Eu, Europium (ppm) | 1.62 | 0.24 | 1.39 | 1.85 | 4-Acid Digestion |
Fe, Iron (wt.%) | 3.68 | 0.133 | 3.58 | 3.78 | 4-Acid Digestion |
Ga, Gallium (ppm) | 25.3 | 1.46 | 24.0 | 26.7 | 4-Acid Digestion |
Gd, Gadolinium (ppm) | 6.16 | 0.269 | 5.72 | 6.60 | 4-Acid Digestion |
Hf, Hafnium (ppm) | 6.51 | 0.426 | 6.15 | 6.86 | 4-Acid Digestion |
Ho, Holmium (ppm) | 0.55 | 0.026 | 0.51 | 0.60 | 4-Acid Digestion |
In, Indium (ppm) | 0.57 | 0.025 | 0.54 | 0.60 | 4-Acid Digestion |
K, Potassium (wt.%) | 2.97 | 0.114 | 2.89 | 3.05 | 4-Acid Digestion |
La, Lanthanum (ppm) | 47.6 | 2.19 | 45.0 | 50.1 | 4-Acid Digestion |
Li, Lithium (ppm) | 30.9 | 1.57 | 29.6 | 32.2 | 4-Acid Digestion |
Lu, Lutetium (ppm) | 0.093 | 0.009 | 0.082 | 0.105 | 4-Acid Digestion |
Mg, Magnesium (wt.%) | 0.311 | 0.013 | 0.301 | 0.322 | 4-Acid Digestion |
Mn, Manganese (wt.%) | 0.035 | 0.001 | 0.033 | 0.036 | 4-Acid Digestion |
Mo, Molybdenum (ppm) | 5.08 | 0.290 | 4.75 | 5.40 | 4-Acid Digestion |
Na, Sodium (wt.%) | 2.58 | 0.101 | 2.50 | 2.66 | 4-Acid Digestion |
Nb, Niobium (ppm) | 20.8 | 1.38 | 19.6 | 22.0 | 4-Acid Digestion |
Nd, Neodymium (ppm) | 40.7 | 1.42 | 38.3 | 43.1 | 4-Acid Digestion |
Ni, Nickel (ppm) | 11.0 | 0.52 | 10.4 | 11.7 | 4-Acid Digestion |
P, Phosphorus (wt.%) | 0.037 | 0.002 | 0.035 | 0.039 | 4-Acid Digestion |
Pb, Lead (ppm) | 27.7 | 1.22 | 26.4 | 29.0 | 4-Acid Digestion |
Pr, Praseodymium (ppm) | 11.1 | 0.53 | 10.3 | 12.0 | 4-Acid Digestion |
Rb, Rubidium (ppm) | 142 | 7 | 135 | 149 | 4-Acid Digestion |
Re, Rhenium (ppm) | < 0.002 | IND | IND | IND | 4-Acid Digestion |
S, Sulphur (wt.%) | 0.027 | 0.004 | 0.025 | 0.029 | 4-Acid Digestion |
Sb, Antimony (ppm) | 1.73 | 0.106 | 1.63 | 1.84 | 4-Acid Digestion |
Sc, Scandium (ppm) | 5.11 | 0.296 | 4.82 | 5.40 | 4-Acid Digestion |
Se, Selenium (ppm) | 2.28 | 0.44 | 1.61 | 2.95 | 4-Acid Digestion |
Sm, Samarium (ppm) | 7.70 | 0.318 | 7.26 | 8.15 | 4-Acid Digestion |
Sn, Tin (ppm) | 4.01 | 0.237 | 3.77 | 4.25 | 4-Acid Digestion |
Sr, Strontium (ppm) | 188 | 10 | 180 | 195 | 4-Acid Digestion |
Ta, Tantalum (ppm) | 1.52 | 0.125 | 1.41 | 1.62 | 4-Acid Digestion |
Tb, Terbium (ppm) | 0.83 | 0.042 | 0.76 | 0.91 | 4-Acid Digestion |
Te, Tellurium (ppm) | 0.097 | 0.016 | 0.071 | 0.122 | 4-Acid Digestion |
Th, Thorium (ppm) | 15.0 | 0.89 | 14.2 | 15.8 | 4-Acid Digestion |
Ti, Titanium (wt.%) | 0.161 | 0.006 | 0.155 | 0.167 | 4-Acid Digestion |
Tl, Thallium (ppm) | 0.78 | 0.036 | 0.73 | 0.83 | 4-Acid Digestion |
Tm, Thulium (ppm) | 0.13 | 0.008 | 0.11 | 0.14 | 4-Acid Digestion |
U, Uranium (ppm) | 5.47 | 0.308 | 5.20 | 5.75 | 4-Acid Digestion |
V, Vanadium (ppm) | 10.7 | 0.98 | 9.9 | 11.5 | 4-Acid Digestion |
W, Tungsten (ppm) | 1.93 | 0.106 | 1.79 | 2.08 | 4-Acid Digestion |
Y, Yttrium (ppm) | 15.8 | 0.75 | 15.1 | 16.4 | 4-Acid Digestion |
Yb, Ytterbium (ppm) | 0.68 | 0.047 | 0.60 | 0.76 | 4-Acid Digestion |
Zn, Zinc (ppm) | 130 | 7 | 124 | 135 | 4-Acid Digestion |
Zr, Zirconium (ppm) | 241 | 9 | 231 | 251 | 4-Acid Digestion |
Ag, Silver (ppm) | 0.568 | 0.028 | 0.537 | 0.600 | Aqua Regia Digestion |
Al, Aluminium (wt.%) | 0.896 | 0.038 | 0.862 | 0.929 | Aqua Regia Digestion |
As, Arsenic (ppm) | 29.5 | 1.58 | 28.3 | 30.8 | Aqua Regia Digestion |
B, Boron (ppm) | < 10.0 | IND | IND | IND | Aqua Regia Digestion |
Ba, Barium (ppm) | 164 | 13 | 155 | 173 | Aqua Regia Digestion |
Be, Beryllium (ppm) | 0.75 | 0.061 | 0.69 | 0.81 | Aqua Regia Digestion |
Bi, Bismuth (ppm) | 4.41 | 0.202 | 4.21 | 4.60 | Aqua Regia Digestion |
Ca, Calcium (wt.%) | 0.883 | 0.030 | 0.859 | 0.907 | Aqua Regia Digestion |
Cd, Cadmium (ppm) | 0.43 | 0.026 | 0.39 | 0.47 | Aqua Regia Digestion |
Ce, Cerium (ppm) | 78 | 3.3 | 75 | 81 | Aqua Regia Digestion |
Co, Cobalt (ppm) | 9.54 | 0.477 | 9.02 | 10.06 | Aqua Regia Digestion |
Cr, Chromium (ppm) | 13.6 | 1.00 | 12.7 | 14.5 | Aqua Regia Digestion |
Cs, Caesium (ppm) | 1.44 | 0.141 | 1.34 | 1.55 | Aqua Regia Digestion |
Cu, Copper (wt.%) | 0.145 | 0.004 | 0.141 | 0.148 | Aqua Regia Digestion |
Fe, Iron (wt.%) | 3.04 | 0.142 | 2.96 | 3.13 | Aqua Regia Digestion |
Ga, Gallium (ppm) | 6.43 | 0.639 | 6.01 | 6.85 | Aqua Regia Digestion |
Ge, Germanium (ppm) | 0.12 | 0.02 | 0.09 | 0.14 | Aqua Regia Digestion |
Hf, Hafnium (ppm) | 1.26 | 0.114 | 1.18 | 1.35 | Aqua Regia Digestion |
In, Indium (ppm) | 0.49 | 0.022 | 0.47 | 0.51 | Aqua Regia Digestion |
K, Potassium (wt.%) | 0.302 | 0.022 | 0.286 | 0.317 | Aqua Regia Digestion |
La, Lanthanum (ppm) | 38.7 | 1.90 | 37.0 | 40.3 | Aqua Regia Digestion |
Li, Lithium (ppm) | 13.9 | 0.91 | 13.3 | 14.6 | Aqua Regia Digestion |
Lu, Lutetium (ppm) | 0.040 | 0.003 | 0.033 | 0.047 | Aqua Regia Digestion |
Mg, Magnesium (wt.%) | 0.194 | 0.013 | 0.183 | 0.204 | Aqua Regia Digestion |
Mn, Manganese (wt.%) | 0.031 | 0.001 | 0.030 | 0.032 | Aqua Regia Digestion |
Mo, Molybdenum (ppm) | 4.61 | 0.321 | 4.35 | 4.87 | Aqua Regia Digestion |
Na, Sodium (wt.%) | 0.106 | 0.008 | 0.099 | 0.114 | Aqua Regia Digestion |
Nb, Niobium (ppm) | 0.44 | 0.10 | 0.34 | 0.53 | Aqua Regia Digestion |
Ni, Nickel (ppm) | 9.80 | 0.395 | 9.36 | 10.24 | Aqua Regia Digestion |
P, Phosphorus (wt.%) | 0.029 | 0.002 | 0.027 | 0.030 | Aqua Regia Digestion |
Pb, Lead (ppm) | 13.9 | 0.84 | 13.4 | 14.5 | Aqua Regia Digestion |
Rb, Rubidium (ppm) | 18.6 | 1.17 | 17.4 | 19.8 | Aqua Regia Digestion |
Re, Rhenium (ppm) | < 0.002 | IND | IND | IND | Aqua Regia Digestion |
S, Sulphur (wt.%) | 0.025 | 0.004 | 0.021 | 0.029 | Aqua Regia Digestion |
Sb, Antimony (ppm) | 0.87 | 0.09 | 0.80 | 0.93 | Aqua Regia Digestion |
Sc, Scandium (ppm) | 1.80 | 0.140 | 1.67 | 1.92 | Aqua Regia Digestion |
Se, Selenium (ppm) | 2.07 | 0.193 | 1.79 | 2.34 | Aqua Regia Digestion |
Sn, Tin (ppm) | 0.96 | 0.13 | 0.86 | 1.07 | Aqua Regia Digestion |
Sr, Strontium (ppm) | 30.3 | 1.38 | 29.2 | 31.5 | Aqua Regia Digestion |
Ta, Tantalum (ppm) | < 0.010 | IND | IND | IND | Aqua Regia Digestion |
Tb, Terbium (ppm) | 0.56 | 0.037 | 0.51 | 0.60 | Aqua Regia Digestion |
Te, Tellurium (ppm) | 0.079 | 0.014 | 0.063 | 0.095 | Aqua Regia Digestion |
Th, Thorium (ppm) | 10.2 | 0.63 | 9.7 | 10.8 | Aqua Regia Digestion |
Ti, Titanium (wt.%) | 0.030 | 0.002 | 0.029 | 0.032 | Aqua Regia Digestion |
Tl, Thallium (ppm) | 0.12 | 0.02 | 0.10 | 0.13 | Aqua Regia Digestion |
U, Uranium (ppm) | 2.92 | 0.174 | 2.78 | 3.07 | Aqua Regia Digestion |
V, Vanadium (ppm) | 6.25 | 0.483 | 5.72 | 6.78 | Aqua Regia Digestion |
W, Tungsten (ppm) | 0.36 | 0.04 | 0.33 | 0.40 | Aqua Regia Digestion |
Y, Yttrium (ppm) | 8.87 | 0.410 | 8.52 | 9.22 | Aqua Regia Digestion |
Yb, Ytterbium (ppm) | 0.34 | 0.06 | 0.28 | 0.39 | Aqua Regia Digestion |
Zn, Zinc (ppm) | 91 | 2.1 | 88 | 94 | Aqua Regia Digestion |
Zr, Zirconium (ppm) | 46.8 | 3.70 | 43.9 | 49.8 | Aqua Regia Digestion |
Cu-Sol(CN), Copper soluble (cyanidation) (wt.%) | 0.008 | 0.002 | 0.007 | 0.009 | Sequential Leach |
Cu-Res(4A), Copper residual (post leach) (wt.%) | 0.017 | 0.002 | 0.016 | 0.019 | Sequential Leach |
Cu-Tot(Calc), Copper total (calculated) (wt.%) | 0.148 | 0.004 | 0.143 | 0.153 | Sequential Leach |
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