OREAS 626

OREAS 626 was prepared from a blend of polymetallic (Au-Zn-Cu-Pb-Ag) ore, barren rhyodacite and a minor addition of Cu concentrate. The ore was sourced from the Rosebery mine located in the north-west region of Tasmania, Australia, approximately 300 kilometres north-west of Hobart and 125 kilometres south of Burnie. The key minerals of economic importance include sphalerite, galena, pyrite, chalcopyrite and electrum. The barren rhyodacite was sourced from the rhyodacitic unit of the Mt Dandenong Igneous Complex located approximately 34km east of Melbourne (Victoria), Australia.

Thirty-one commercial analytical laboratories participated in the program to certify the elements reported below. The following methods were employed:

  • Gold by fire assay (25-50g charge weight) with AAS or ICP-OES finish;
  • Gold by aqua regia digestion (10-50g sample weight) with AAS or ICP-MS finish;
  • Full ICP-OES and ICP-MS elemental suites by 4-acid (HNO3-HF-HClO4-HCl) digestion;
  • Full ICP-OES and ICP-MS elemental suites by aqua regia digestion;
  • Full ICP-OES and ICP-MS elemental suites by peroxide fusion and
  • Total Sulphur by infrared combustion furnace.

Instrumental neutron activation analysis for Au on 20 x 85mg subsamples was also undertaken at ANSTO, Lucas Heights to confirm homogeneity (see Table 5 of Certificate).

Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
Zn, Zinc (wt.%) 5.10 0.153 4.99 5.20 4-Acid Digestion
Cu, Copper (wt.%) 0.360 0.015 0.350 0.370 4-Acid Digestion
Au, Gold (ppm) 1.26 0.046 1.24 1.27 Pb Fire Assay
Au, Gold (ppm) 1.26 0.037 1.24 1.27 Aqua Regia Digestion (sample weights 10-50g)
S, Sulphur (wt.%) 7.20 0.199 7.09 7.32 Infrared Combustion
Al, Aluminium (wt.%) 6.06 0.122 5.94 6.17 Peroxide Fusion ICP
As, Arsenic (ppm) 278 16 265 291 Peroxide Fusion ICP
Ba, Barium (ppm) 4628 322 4402 4854 Peroxide Fusion ICP
Bi, Bismuth (ppm) 17.0 1.38 15.3 18.7 Peroxide Fusion ICP
Ca, Calcium (wt.%) 0.981 0.028 0.938 1.024 Peroxide Fusion ICP
Cd, Cadmium (ppm) 139 9 130 147 Peroxide Fusion ICP
Ce, Cerium (ppm) 78 1.9 74 82 Peroxide Fusion ICP
Co, Cobalt (ppm) 11.3 0.87 10.4 12.2 Peroxide Fusion ICP
Cs, Caesium (ppm) 5.54 0.274 5.10 5.97 Peroxide Fusion ICP
Cu, Copper (wt.%) 0.361 0.011 0.352 0.369 Peroxide Fusion ICP
Dy, Dysprosium (ppm) 3.75 0.232 3.44 4.05 Peroxide Fusion ICP
Er, Erbium (ppm) 1.75 0.099 1.56 1.94 Peroxide Fusion ICP
Eu, Europium (ppm) 1.84 0.43 1.41 2.27 Peroxide Fusion ICP
Fe, Iron (wt.%) 5.73 0.160 5.60 5.87 Peroxide Fusion ICP
Ga, Gallium (ppm) 18.2 1.40 16.0 20.4 Peroxide Fusion ICP
Gd, Gadolinium (ppm) 5.29 0.468 4.75 5.82 Peroxide Fusion ICP
Ge, Germanium (ppm) 1.98 0.185 1.50 2.47 Peroxide Fusion ICP
Ho, Holmium (ppm) 0.68 0.047 0.59 0.76 Peroxide Fusion ICP
In, Indium (ppm) 4.11 0.310 3.73 4.50 Peroxide Fusion ICP
K, Potassium (wt.%) 2.72 0.064 2.62 2.81 Peroxide Fusion ICP
La, Lanthanum (ppm) 38.8 2.43 36.7 41.0 Peroxide Fusion ICP
Li, Lithium (ppm) 21.1 2.6 18.0 24.2 Peroxide Fusion ICP
Lu, Lutetium (ppm) 0.21 0.016 0.18 0.24 Peroxide Fusion ICP
Mg, Magnesium (wt.%) 0.428 0.017 0.412 0.443 Peroxide Fusion ICP
Mn, Manganese (wt.%) 0.848 0.017 0.828 0.868 Peroxide Fusion ICP
Mo, Molybdenum (ppm) 23.1 2.13 20.7 25.5 Peroxide Fusion ICP
Nb, Niobium (ppm) 11.9 1.8 10.0 13.9 Peroxide Fusion ICP
Nd, Neodymium (ppm) 33.9 0.72 32.6 35.2 Peroxide Fusion ICP
P, Phosphorus (wt.%) 0.033 0.005 0.025 0.040 Peroxide Fusion ICP
Pb, Lead (wt.%) 1.46 0.043 1.42 1.51 Peroxide Fusion ICP
Pr, Praseodymium (ppm) 9.37 1.24 8.29 10.45 Peroxide Fusion ICP
Rb, Rubidium (ppm) 134 5 126 141 Peroxide Fusion ICP
S, Sulphur (wt.%) 7.14 0.223 6.91 7.37 Peroxide Fusion ICP
Sb, Antimony (ppm) 83 3.8 77 89 Peroxide Fusion ICP
Si, Silicon (wt.%) 26.04 0.742 25.25 26.83 Peroxide Fusion ICP
Sm, Samarium (ppm) 6.45 0.340 5.72 7.17 Peroxide Fusion ICP
Sr, Strontium (ppm) 121 11 114 128 Peroxide Fusion ICP
Tb, Terbium (ppm) 0.76 0.065 0.64 0.88 Peroxide Fusion ICP
Th, Thorium (ppm) 13.2 1.16 12.1 14.3 Peroxide Fusion ICP
Ti, Titanium (wt.%) 0.154 0.006 0.146 0.162 Peroxide Fusion ICP
Tl, Thallium (ppm) 18.4 1.18 17.1 19.8 Peroxide Fusion ICP
Tm, Thulium (ppm) 0.23 0.03 0.20 0.26 Peroxide Fusion ICP
U, Uranium (ppm) 5.75 0.521 5.21 6.30 Peroxide Fusion ICP
V, Vanadium (ppm) 20.9 1.73 19.5 22.2 Peroxide Fusion ICP
W, Tungsten (ppm) 6.41 0.68 5.17 7.65 Peroxide Fusion ICP
Y, Yttrium (ppm) 19.1 0.96 17.9 20.3 Peroxide Fusion ICP
Yb, Ytterbium (ppm) 1.55 0.090 1.33 1.76 Peroxide Fusion ICP
Zn, Zinc (wt.%) 5.12 0.104 4.98 5.27 Peroxide Fusion ICP
Ag, Silver (ppm) 29.6 1.26 28.6 30.6 4-Acid Digestion
Al, Aluminium (wt.%) 5.86 0.184 5.63 6.10 4-Acid Digestion
As, Arsenic (ppm) 274 13 264 285 4-Acid Digestion
Be, Beryllium (ppm) 2.10 0.130 1.99 2.21 4-Acid Digestion
Bi, Bismuth (ppm) 16.9 0.92 16.1 17.6 4-Acid Digestion
Ca, Calcium (wt.%) 0.969 0.027 0.938 1.001 4-Acid Digestion
Cd, Cadmium (ppm) 141 6 136 146 4-Acid Digestion
Ce, Cerium (ppm) 61 11 53 68 4-Acid Digestion
Co, Cobalt (ppm) 10.4 0.46 10.0 10.9 4-Acid Digestion
Cr, Chromium (ppm) 20.2 2.3 18.2 22.3 4-Acid Digestion
Cs, Caesium (ppm) 5.41 0.289 5.12 5.70 4-Acid Digestion
Dy, Dysprosium (ppm) 3.77 0.321 3.28 4.26 4-Acid Digestion
Er, Erbium (ppm) 1.51 0.107 1.36 1.67 4-Acid Digestion
Eu, Europium (ppm) 1.41 0.16 1.18 1.64 4-Acid Digestion
Fe, Iron (wt.%) 5.66 0.151 5.51 5.81 4-Acid Digestion
Ga, Gallium (ppm) 18.6 0.93 17.7 19.4 4-Acid Digestion
Gd, Gadolinium (ppm) 5.08 0.440 4.44 5.72 4-Acid Digestion
Hf, Hafnium (ppm) 4.89 0.341 4.59 5.20 4-Acid Digestion
Ho, Holmium (ppm) 0.61 0.060 0.54 0.68 4-Acid Digestion
In, Indium (ppm) 4.07 0.209 3.87 4.28 4-Acid Digestion
K, Potassium (wt.%) 2.64 0.088 2.57 2.71 4-Acid Digestion
La, Lanthanum (ppm) 27.3 7.2 23.7 30.9 4-Acid Digestion
Li, Lithium (ppm) 19.6 0.93 18.7 20.6 4-Acid Digestion
Lu, Lutetium (ppm) 0.20 0.018 0.18 0.23 4-Acid Digestion
Mg, Magnesium (wt.%) 0.417 0.022 0.399 0.435 4-Acid Digestion
Mn, Manganese (wt.%) 0.844 0.037 0.822 0.866 4-Acid Digestion
Mo, Molybdenum (ppm) 21.4 1.39 20.3 22.5 4-Acid Digestion
Na, Sodium (wt.%) 1.24 0.045 1.20 1.28 4-Acid Digestion
Nb, Niobium (ppm) 11.7 1.06 10.9 12.5 4-Acid Digestion
Nd, Neodymium (ppm) 32.2 3.6 26.9 37.5 4-Acid Digestion
Ni, Nickel (ppm) 24.6 1.14 23.2 26.0 4-Acid Digestion
P, Phosphorus (wt.%) 0.035 0.002 0.033 0.036 4-Acid Digestion
Pb, Lead (wt.%) 1.50 0.036 1.46 1.54 4-Acid Digestion
Pr, Praseodymium (ppm) 8.74 1.63 6.85 10.64 4-Acid Digestion
Rb, Rubidium (ppm) 128 9 119 137 4-Acid Digestion
Re, Rhenium (ppm) 0.003 0.001 0.001 0.004 4-Acid Digestion
S, Sulphur (wt.%) 7.00 0.190 6.82 7.18 4-Acid Digestion
Sb, Antimony (ppm) 80 4.0 77 83 4-Acid Digestion
Sc, Scandium (ppm) 5.15 0.349 4.77 5.54 4-Acid Digestion
Sm, Samarium (ppm) 6.66 1.01 5.44 7.89 4-Acid Digestion
Sn, Tin (ppm) 3.57 0.181 3.35 3.78 4-Acid Digestion
Sr, Strontium (ppm) 100 8.7 93 106 4-Acid Digestion
Ta, Tantalum (ppm) 0.88 0.061 0.80 0.95 4-Acid Digestion
Tb, Terbium (ppm) 0.67 0.053 0.62 0.73 4-Acid Digestion
Te, Tellurium (ppm) 0.089 0.020 0.056 0.122 4-Acid Digestion
Th, Thorium (ppm) 11.3 1.8 10.0 12.6 4-Acid Digestion
Ti, Titanium (wt.%) 0.137 0.008 0.130 0.145 4-Acid Digestion
Tl, Thallium (ppm) 18.2 0.89 17.3 19.1 4-Acid Digestion
Tm, Thulium (ppm) 0.21 0.02 0.18 0.25 4-Acid Digestion
U, Uranium (ppm) 5.43 0.294 5.16 5.69 4-Acid Digestion
V, Vanadium (ppm) 21.6 1.22 20.6 22.6 4-Acid Digestion
W, Tungsten (ppm) 5.94 0.435 5.50 6.39 4-Acid Digestion
Y, Yttrium (ppm) 15.0 1.6 13.8 16.2 4-Acid Digestion
Yb, Ytterbium (ppm) 1.38 0.118 1.24 1.51 4-Acid Digestion
Zr, Zirconium (ppm) 173 8 166 179 4-Acid Digestion
Ag, Silver (ppm) 29.5 1.20 28.5 30.4 Aqua Regia Digestion
Al, Aluminium (wt.%) 0.725 0.084 0.676 0.775 Aqua Regia Digestion
As, Arsenic (ppm) 264 9 255 273 Aqua Regia Digestion
B, Boron (ppm) < 10.0 IND IND IND Aqua Regia Digestion
Be, Beryllium (ppm) 0.50 0.05 0.45 0.55 Aqua Regia Digestion
Bi, Bismuth (ppm) 17.2 0.51 16.6 17.8 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.830 0.028 0.802 0.857 Aqua Regia Digestion
Cd, Cadmium (ppm) 138 6 133 142 Aqua Regia Digestion
Ce, Cerium (ppm) 39.9 4.7 36.9 42.9 Aqua Regia Digestion
Co, Cobalt (ppm) 10.2 0.81 9.7 10.7 Aqua Regia Digestion
Cr, Chromium (ppm) 17.8 0.91 16.9 18.8 Aqua Regia Digestion
Cs, Caesium (ppm) 1.52 0.102 1.43 1.60 Aqua Regia Digestion
Cu, Copper (wt.%) 0.362 0.013 0.352 0.372 Aqua Regia Digestion
Fe, Iron (wt.%) 5.16 0.259 4.98 5.34 Aqua Regia Digestion
Ga, Gallium (ppm) 3.35 0.38 3.10 3.61 Aqua Regia Digestion
Hf, Hafnium (ppm) 1.17 0.18 1.06 1.28 Aqua Regia Digestion
Hg, Mercury (ppm) 2.92 0.231 2.75 3.10 Aqua Regia Digestion
In, Indium (ppm) 4.03 0.362 3.80 4.26 Aqua Regia Digestion
K, Potassium (wt.%) 0.297 0.031 0.281 0.313 Aqua Regia Digestion
La, Lanthanum (ppm) 18.7 1.62 17.5 20.0 Aqua Regia Digestion
Li, Lithium (ppm) 5.57 0.551 5.02 6.11 Aqua Regia Digestion
Lu, Lutetium (ppm) 0.068 0.007 0.056 0.079 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.232 0.015 0.219 0.245 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.820 0.032 0.792 0.847 Aqua Regia Digestion
Mo, Molybdenum (ppm) 20.6 1.04 19.7 21.4 Aqua Regia Digestion
Na, Sodium (wt.%) 0.047 0.007 0.044 0.049 Aqua Regia Digestion
Nb, Niobium (ppm) 0.68 0.12 0.59 0.76 Aqua Regia Digestion
Ni, Nickel (ppm) 23.6 1.48 22.5 24.7 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.031 0.002 0.029 0.032 Aqua Regia Digestion
Pb, Lead (wt.%) 1.51 0.020 1.48 1.54 Aqua Regia Digestion
Rb, Rubidium (ppm) 16.1 1.6 14.9 17.3 Aqua Regia Digestion
Re, Rhenium (ppm) 0.003 0.001 0.001 0.004 Aqua Regia Digestion
S, Sulphur (wt.%) 6.77 0.505 6.45 7.08 Aqua Regia Digestion
Sb, Antimony (ppm) 62 6 59 66 Aqua Regia Digestion
Sc, Scandium (ppm) 1.23 0.20 1.09 1.36 Aqua Regia Digestion
Sn, Tin (ppm) 1.16 0.20 1.01 1.31 Aqua Regia Digestion
Sr, Strontium (ppm) 20.1 2.1 18.9 21.4 Aqua Regia Digestion
Ta, Tantalum (ppm) 0.009 0.002 0.004 0.013 Aqua Regia Digestion
Tb, Terbium (ppm) 0.38 0.017 0.34 0.41 Aqua Regia Digestion
Te, Tellurium (ppm) 0.084 0.016 0.057 0.110 Aqua Regia Digestion
Th, Thorium (ppm) 7.81 0.659 7.34 8.29 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.027 0.007 0.023 0.030 Aqua Regia Digestion
Tl, Thallium (ppm) 5.96 0.327 5.67 6.25 Aqua Regia Digestion
U, Uranium (ppm) 2.81 0.166 2.68 2.94 Aqua Regia Digestion
V, Vanadium (ppm) 6.52 0.75 5.72 7.32 Aqua Regia Digestion
W, Tungsten (ppm) 2.56 0.211 2.41 2.71 Aqua Regia Digestion
Y, Yttrium (ppm) 7.13 0.627 6.74 7.53 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.49 0.07 0.42 0.57 Aqua Regia Digestion
Zn, Zinc (wt.%) 5.15 0.150 5.03 5.28 Aqua Regia Digestion
Zr, Zirconium (ppm) 42.7 5.5 39.0 46.4 Aqua Regia Digestion
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