OREAS 906b

OREAS 906b was prepared from a blend of copper-gold oxide ore 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 rhyodacite was sourced from a quarry approximately 30km east of Melbourne, Australia.

Twenty-eight commercial analytical laboratories participated in the program. The following methods were employed:

  • Gold by fire assay (25-50g charge weight) with AAS (17 laboratories), ICP-OES (8 laboratories) finish or ICP-MS (1 laboratory) finish;
  • Gold by aqua regia digestion (15-30g sample weight) with AAS (4 laboratories) or ICP-OES/MS (14 laboratories) finish;
  • Copper by sequential leach: 5 % H2SO4 acid leach, 10 % alkaline (NaCN) leach, residual leach (4-acid digestion with ICP-OES or AAS finish) and calculated total (up to 19 laboratories depending on the constituent);
  • Specific gravity by gas (18 laboratories) or liquid (2 laboratories) pycnometry;
  • Full ICP-OES and ICP-MS elemental suites by 4-acid (HNO3-HF-HClO4-HCl) digestion (up to 26 laboratories depending on the element);
  • Full ICP-OES and ICP-MS elemental suites by sodium peroxide fusion (up to 20 laboratories depending on the element);
  • Full ICP-OES and ICP-MS elemental suites by aqua regia digestion (up to 26 laboratories depending on the element).

To evaluate homogeneity, instrumental neutron activation analysis (INAA) of Au on 20 x 85mg subsamples was undertaken at ANSTO, Lucas Heights in Australia.

Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
Cu, Copper (wt.%) 0.314 0.008 0.307 0.322 4-Acid Digestion
Cu-Sol(H2SO4), Copper soluble (sulphuric) (wt.%) 0.260 0.007 0.252 0.267 Sequential Leach
Au, Gold (ppb) 52.4 3.65 50.7 54.1 Pb Fire Assay
Au, Gold (ppb) 51.8 3.83 49.6 54.1 Aqua Regia Digestion (sample weights 10-50g)
Cu-Res(4A), Copper residual (post leach) (wt.%) 0.039 0.002 0.037 0.041 Sequential Leach
Cu-Sol(CN), Copper soluble (cyanidation) (wt.%) 0.015 0.003 0.014 0.017 Sequential Leach
Cu-Tot(Calc), Copper total (calculated) (wt.%) 0.313 0.007 0.304 0.321 Sequential Leach
SG, Specific Gravity (Unity) 2.74 0.047 2.71 2.77 Gas / Liquid Pycnometry
Ag, Silver (ppm) 0.709 0.036 0.661 0.757 4-Acid Digestion
Al, Aluminium (wt.%) 7.46 0.261 7.24 7.67 4-Acid Digestion
As, Arsenic (ppm) 13.7 1.27 12.6 14.8 4-Acid Digestion
Ba, Barium (ppm) 2819 85 2734 2905 4-Acid Digestion
Be, Beryllium (ppm) 2.99 0.117 2.81 3.16 4-Acid Digestion
Bi, Bismuth (ppm) 9.99 0.525 9.60 10.38 4-Acid Digestion
Ca, Calcium (wt.%) 0.644 0.024 0.627 0.661 4-Acid Digestion
Cd, Cadmium (ppm) 0.42 0.039 0.37 0.46 4-Acid Digestion
Ce, Cerium (ppm) 92 5.5 88 96 4-Acid Digestion
Co, Cobalt (ppm) 17.6 0.79 16.9 18.2 4-Acid Digestion
Cr, Chromium (ppm) 10.2 1.1 8.7 11.6 4-Acid Digestion
Cs, Caesium (ppm) 6.97 0.201 6.73 7.21 4-Acid Digestion
Dy, Dysprosium (ppm) 3.71 0.248 3.39 4.02 4-Acid Digestion
Er, Erbium (ppm) 1.07 0.077 0.93 1.21 4-Acid Digestion
Eu, Europium (ppm) 1.51 0.19 1.29 1.72 4-Acid Digestion
Fe, Iron (wt.%) 4.85 0.086 4.76 4.95 4-Acid Digestion
Ga, Gallium (ppm) 28.1 1.00 27.2 29.1 4-Acid Digestion
Gd, Gadolinium (ppm) 5.90 0.576 5.25 6.56 4-Acid Digestion
Ge, Germanium (ppm) 0.21 0.05 0.15 0.26 4-Acid Digestion
Hf, Hafnium (ppm) 7.15 0.329 6.79 7.51 4-Acid Digestion
Ho, Holmium (ppm) 0.50 0.07 0.43 0.57 4-Acid Digestion
In, Indium (ppm) 1.16 0.075 1.10 1.22 4-Acid Digestion
K, Potassium (wt.%) 2.88 0.068 2.81 2.96 4-Acid Digestion
La, Lanthanum (ppm) 45.0 2.97 42.9 47.0 4-Acid Digestion
Li, Lithium (ppm) 20.6 0.93 19.6 21.6 4-Acid Digestion
Lu, Lutetium (ppm) 0.085 0.005 0.075 0.095 4-Acid Digestion
Mg, Magnesium (wt.%) 0.233 0.013 0.222 0.244 4-Acid Digestion
Mn, Manganese (wt.%) 0.032 0.001 0.031 0.033 4-Acid Digestion
Mo, Molybdenum (ppm) 4.91 0.366 4.57 5.26 4-Acid Digestion
Na, Sodium (wt.%) 2.63 0.133 2.55 2.70 4-Acid Digestion
Nb, Niobium (ppm) 18.3 1.08 17.5 19.1 4-Acid Digestion
Nd, Neodymium (ppm) 38.6 3.50 35.1 42.2 4-Acid Digestion
Ni, Nickel (ppm) 3.22 0.44 2.83 3.62 4-Acid Digestion
P, Phosphorus (wt.%) 0.028 0.001 0.027 0.029 4-Acid Digestion
Pb, Lead (ppm) 31.7 1.37 30.2 33.2 4-Acid Digestion
Pr, Praseodymium (ppm) 10.2 0.62 9.4 11.0 4-Acid Digestion
Rb, Rubidium (ppm) 138 7 133 144 4-Acid Digestion
Re, Rhenium (ppm) 0.002 0.001 0.001 0.003 4-Acid Digestion
S, Sulphur (wt.%) 0.044 0.006 0.042 0.047 4-Acid Digestion
Sb, Antimony (ppm) 2.16 0.143 2.03 2.28 4-Acid Digestion
Sc, Scandium (ppm) 4.71 0.54 4.34 5.09 4-Acid Digestion
Se, Selenium (ppm) 5.11 0.508 4.31 5.90 4-Acid Digestion
Sm, Samarium (ppm) 7.37 0.525 6.88 7.86 4-Acid Digestion
Sn, Tin (ppm) 4.24 0.250 3.96 4.52 4-Acid Digestion
Sr, Strontium (ppm) 165 6 160 170 4-Acid Digestion
Ta, Tantalum (ppm) 1.37 0.133 1.27 1.46 4-Acid Digestion
Tb, Terbium (ppm) 0.79 0.023 0.75 0.84 4-Acid Digestion
Te, Tellurium (ppm) 0.20 0.03 0.16 0.24 4-Acid Digestion
Th, Thorium (ppm) 14.8 0.69 14.0 15.6 4-Acid Digestion
Ti, Titanium (wt.%) 0.111 0.005 0.107 0.114 4-Acid Digestion
Tl, Thallium (ppm) 0.72 0.032 0.69 0.75 4-Acid Digestion
Tm, Thulium (ppm) 0.11 0.02 0.09 0.13 4-Acid Digestion
U, Uranium (ppm) 5.08 0.209 4.86 5.30 4-Acid Digestion
V, Vanadium (ppm) 3.88 0.55 3.28 4.49 4-Acid Digestion
W, Tungsten (ppm) 2.61 0.159 2.45 2.77 4-Acid Digestion
Y, Yttrium (ppm) 15.8 0.64 15.1 16.4 4-Acid Digestion
Yb, Ytterbium (ppm) 0.61 0.07 0.53 0.70 4-Acid Digestion
Zn, Zinc (ppm) 147 5 142 152 4-Acid Digestion
Zr, Zirconium (ppm) 267 10 259 276 4-Acid Digestion
Al, Aluminium (wt.%) 7.57 0.233 7.33 7.81 Peroxide Fusion ICP
Ba, Barium (ppm) 2841 118 2718 2965 Peroxide Fusion ICP
Be, Beryllium (ppm) 3.15 0.39 2.50 3.79 Peroxide Fusion ICP
Bi, Bismuth (ppm) 10.4 0.39 9.6 11.3 Peroxide Fusion ICP
Ca, Calcium (wt.%) 0.638 0.041 0.601 0.676 Peroxide Fusion ICP
Ce, Cerium (ppm) 88 5.9 80 96 Peroxide Fusion ICP
Co, Cobalt (ppm) 17.5 1.9 15.9 19.2 Peroxide Fusion ICP
Cs, Caesium (ppm) 7.05 0.422 6.53 7.57 Peroxide Fusion ICP
Cu, Copper (wt.%) 0.311 0.017 0.300 0.322 Peroxide Fusion ICP
Dy, Dysprosium (ppm) 3.74 0.200 3.24 4.25 Peroxide Fusion ICP
Er, Erbium (ppm) 1.13 0.097 0.90 1.35 Peroxide Fusion ICP
Eu, Europium (ppm) 1.51 0.079 1.39 1.64 Peroxide Fusion ICP
Fe, Iron (wt.%) 4.92 0.232 4.72 5.11 Peroxide Fusion ICP
Ga, Gallium (ppm) 28.0 1.93 26.0 30.0 Peroxide Fusion ICP
Gd, Gadolinium (ppm) 6.05 0.582 5.43 6.67 Peroxide Fusion ICP
Ge, Germanium (ppm) 1.74 0.34 0.96 2.52 Peroxide Fusion ICP
Hf, Hafnium (ppm) 6.91 0.485 5.91 7.90 Peroxide Fusion ICP
Ho, Holmium (ppm) 0.52 0.045 0.43 0.62 Peroxide Fusion ICP
In, Indium (ppm) 1.16 0.092 1.00 1.33 Peroxide Fusion ICP
K, Potassium (wt.%) 2.98 0.195 2.85 3.11 Peroxide Fusion ICP
La, Lanthanum (ppm) 44.2 1.99 41.6 46.9 Peroxide Fusion ICP
Li, Lithium (ppm) 20.8 2.8 18.8 22.9 Peroxide Fusion ICP
Mg, Magnesium (wt.%) 0.233 0.012 0.221 0.245 Peroxide Fusion ICP
Mn, Manganese (wt.%) 0.032 0.002 0.031 0.034 Peroxide Fusion ICP
Mo, Molybdenum (ppm) 5.00 0.82 3.88 6.12 Peroxide Fusion ICP
Nb, Niobium (ppm) 17.7 2.7 14.6 20.8 Peroxide Fusion ICP
Nd, Neodymium (ppm) 38.4 3.73 34.1 42.6 Peroxide Fusion ICP
P, Phosphorus (wt.%) 0.029 0.007 0.025 0.033 Peroxide Fusion ICP
Pb, Lead (ppm) 31.4 4.0 27.2 35.5 Peroxide Fusion ICP
Pr, Praseodymium (ppm) 10.2 0.63 8.5 11.8 Peroxide Fusion ICP
Rb, Rubidium (ppm) 137 4 133 141 Peroxide Fusion ICP
Sb, Antimony (ppm) 2.05 0.26 1.70 2.39 Peroxide Fusion ICP
Si, Silicon (wt.%) 31.18 0.887 30.29 32.07 Peroxide Fusion ICP
Sm, Samarium (ppm) 7.13 0.703 6.33 7.93 Peroxide Fusion ICP
Sr, Strontium (ppm) 164 12 154 174 Peroxide Fusion ICP
Ta, Tantalum (ppm) 1.55 0.39 1.06 2.04 Peroxide Fusion ICP
Tb, Terbium (ppm) 0.79 0.073 0.67 0.90 Peroxide Fusion ICP
Th, Thorium (ppm) 14.7 0.49 13.7 15.8 Peroxide Fusion ICP
Ti, Titanium (wt.%) 0.115 0.006 0.106 0.123 Peroxide Fusion ICP
Tl, Thallium (ppm) 0.74 0.062 0.62 0.86 Peroxide Fusion ICP
Tm, Thulium (ppm) 0.12 0.03 0.10 0.15 Peroxide Fusion ICP
U, Uranium (ppm) 5.22 0.232 4.99 5.45 Peroxide Fusion ICP
Y, Yttrium (ppm) 16.4 1.37 13.8 19.0 Peroxide Fusion ICP
Yb, Ytterbium (ppm) 0.68 0.060 0.54 0.82 Peroxide Fusion ICP
Zn, Zinc (ppm) 153 18 132 175 Peroxide Fusion ICP
Ag, Silver (ppm) 0.672 0.042 0.633 0.710 Aqua Regia Digestion
Al, Aluminium (wt.%) 0.575 0.040 0.545 0.605 Aqua Regia Digestion
As, Arsenic (ppm) 11.8 0.68 11.2 12.5 Aqua Regia Digestion
B, Boron (ppm) < 10.0 IND IND IND Aqua Regia Digestion
Ba, Barium (ppm) 185 21 173 197 Aqua Regia Digestion
Be, Beryllium (ppm) 0.85 0.042 0.80 0.89 Aqua Regia Digestion
Bi, Bismuth (ppm) 9.91 0.545 9.58 10.23 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.363 0.016 0.351 0.375 Aqua Regia Digestion
Cd, Cadmium (ppm) 0.40 0.023 0.37 0.43 Aqua Regia Digestion
Ce, Cerium (ppm) 77 5.4 73 80 Aqua Regia Digestion
Co, Cobalt (ppm) 15.8 0.61 15.2 16.5 Aqua Regia Digestion
Cr, Chromium (ppm) 10.0 0.76 9.0 11.0 Aqua Regia Digestion
Cs, Caesium (ppm) 0.98 0.15 0.88 1.07 Aqua Regia Digestion
Cu, Copper (wt.%) 0.316 0.011 0.307 0.325 Aqua Regia Digestion
Fe, Iron (wt.%) 4.22 0.136 4.09 4.35 Aqua Regia Digestion
Ga, Gallium (ppm) 7.00 0.358 6.64 7.36 Aqua Regia Digestion
Ge, Germanium (ppm) 0.11 0.03 0.07 0.14 Aqua Regia Digestion
Hf, Hafnium (ppm) 1.14 0.12 1.03 1.24 Aqua Regia Digestion
In, Indium (ppm) 1.07 0.036 1.03 1.11 Aqua Regia Digestion
K, Potassium (wt.%) 0.228 0.022 0.214 0.242 Aqua Regia Digestion
La, Lanthanum (ppm) 37.6 3.20 35.8 39.4 Aqua Regia Digestion
Li, Lithium (ppm) 3.27 0.33 2.95 3.58 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.097 0.007 0.090 0.104 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.028 0.001 0.028 0.029 Aqua Regia Digestion
Mo, Molybdenum (ppm) 4.47 0.337 4.23 4.70 Aqua Regia Digestion
Na, Sodium (wt.%) 0.070 0.007 0.062 0.077 Aqua Regia Digestion
Nb, Niobium (ppm) 0.47 0.17 0.36 0.58 Aqua Regia Digestion
Ni, Nickel (ppm) 2.69 0.197 2.39 3.00 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.025 0.001 0.023 0.026 Aqua Regia Digestion
Pb, Lead (ppm) 16.9 0.89 16.0 17.7 Aqua Regia Digestion
Rb, Rubidium (ppm) 12.6 1.4 11.6 13.6 Aqua Regia Digestion
S, Sulphur (wt.%) 0.040 0.002 0.038 0.042 Aqua Regia Digestion
Sb, Antimony (ppm) 1.26 0.13 1.18 1.35 Aqua Regia Digestion
Sc, Scandium (ppm) 1.39 0.18 1.27 1.52 Aqua Regia Digestion
Se, Selenium (ppm) 4.52 0.369 4.04 5.00 Aqua Regia Digestion
Sn, Tin (ppm) 1.32 0.064 1.23 1.41 Aqua Regia Digestion
Sr, Strontium (ppm) 10.8 0.49 10.3 11.2 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.010 IND IND IND Aqua Regia Digestion
Tb, Terbium (ppm) 0.43 0.041 0.37 0.49 Aqua Regia Digestion
Te, Tellurium (ppm) 0.18 0.02 0.14 0.21 Aqua Regia Digestion
Th, Thorium (ppm) 8.32 0.678 7.83 8.82 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.015 0.003 0.014 0.017 Aqua Regia Digestion
Tl, Thallium (ppm) 0.073 0.009 0.063 0.082 Aqua Regia Digestion
U, Uranium (ppm) 2.23 0.215 2.08 2.38 Aqua Regia Digestion
V, Vanadium (ppm) 2.01 0.072 1.90 2.13 Aqua Regia Digestion
W, Tungsten (ppm) 0.66 0.12 0.56 0.76 Aqua Regia Digestion
Y, Yttrium (ppm) 6.70 0.81 6.22 7.18 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.23 0.04 0.20 0.27 Aqua Regia Digestion
Zn, Zinc (ppm) 68 3.4 65 70 Aqua Regia Digestion
Zr, Zirconium (ppm) 46.4 4.33 43.3 49.4 Aqua Regia Digestion
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