OREAS 625

OREAS 625 was prepared from a blend of polymetallic (Au-Zn-Cu-Pb-Ag) ore, barren rhyodacite and minor additions of Cu, Zn and Pb concentrates. 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.%) 3.17 0.098 3.10 3.24 4-Acid Digestion
Cu, Copper (wt.%) 0.171 0.006 0.166 0.176 4-Acid Digestion
Au, Gold (ppm) 0.667 0.020 0.659 0.674 Pb Fire Assay
Au, Gold (ppm) 0.667 0.024 0.656 0.677 Aqua Regia Digestion (sample weights 10-50g)
S, Sulphur (wt.%) 3.91 0.112 3.83 4.00 Infrared Combustion
Al, Aluminium (wt.%) 6.83 0.171 6.65 7.00 Peroxide Fusion ICP
As, Arsenic (ppm) 144 22 134 155 Peroxide Fusion ICP
Ba, Barium (ppm) 3415 243 3249 3581 Peroxide Fusion ICP
Bi, Bismuth (ppm) 8.61 0.684 7.93 9.29 Peroxide Fusion ICP
Ca, Calcium (wt.%) 1.15 0.055 1.09 1.21 Peroxide Fusion ICP
Cd, Cadmium (ppm) 83 4.6 77 88 Peroxide Fusion ICP
Ce, Cerium (ppm) 86 2.5 80 92 Peroxide Fusion ICP
Co, Cobalt (ppm) 4.50 0.406 3.80 5.21 Peroxide Fusion ICP
Cs, Caesium (ppm) 6.00 0.281 5.40 6.60 Peroxide Fusion ICP
Cu, Copper (wt.%) 0.170 0.005 0.166 0.175 Peroxide Fusion ICP
Dy, Dysprosium (ppm) 3.66 0.284 3.22 4.09 Peroxide Fusion ICP
Er, Erbium (ppm) 1.41 0.092 1.25 1.58 Peroxide Fusion ICP
Eu, Europium (ppm) 1.58 0.30 1.23 1.93 Peroxide Fusion ICP
Fe, Iron (wt.%) 4.01 0.109 3.91 4.11 Peroxide Fusion ICP
Ga, Gallium (ppm) 20.4 1.34 18.8 22.1 Peroxide Fusion ICP
Gd, Gadolinium (ppm) 5.53 0.245 4.99 6.07 Peroxide Fusion ICP
Ge, Germanium (ppm) 1.31 0.45 0.43 2.18 Peroxide Fusion ICP
Ho, Holmium (ppm) 0.60 0.023 0.58 0.63 Peroxide Fusion ICP
In, Indium (ppm) 2.11 0.187 1.85 2.36 Peroxide Fusion ICP
K, Potassium (wt.%) 2.89 0.075 2.80 2.98 Peroxide Fusion ICP
La, Lanthanum (ppm) 43.4 1.72 40.9 45.9 Peroxide Fusion ICP
Li, Lithium (ppm) 18.2 1.73 15.9 20.4 Peroxide Fusion ICP
Lu, Lutetium (ppm) 0.14 0.03 0.11 0.17 Peroxide Fusion ICP
Mg, Magnesium (wt.%) 0.267 0.013 0.257 0.276 Peroxide Fusion ICP
Mn, Manganese (wt.%) 0.447 0.009 0.438 0.456 Peroxide Fusion ICP
Mo, Molybdenum (ppm) 13.7 1.7 12.1 15.3 Peroxide Fusion ICP
Nb, Niobium (ppm) 14.7 2.2 12.4 17.0 Peroxide Fusion ICP
Nd, Neodymium (ppm) 37.7 1.09 35.9 39.5 Peroxide Fusion ICP
P, Phosphorus (wt.%) 0.030 0.001 0.028 0.032 Peroxide Fusion ICP
Pb, Lead (wt.%) 0.806 0.034 0.783 0.829 Peroxide Fusion ICP
Pr, Praseodymium (ppm) 9.95 0.941 8.98 10.93 Peroxide Fusion ICP
Rb, Rubidium (ppm) 136 9 127 146 Peroxide Fusion ICP
S, Sulphur (wt.%) 3.85 0.150 3.73 3.98 Peroxide Fusion ICP
Sb, Antimony (ppm) 36.2 1.39 33.1 39.3 Peroxide Fusion ICP
Si, Silicon (wt.%) 29.02 0.756 28.25 29.79 Peroxide Fusion ICP
Sm, Samarium (ppm) 7.04 0.454 6.21 7.86 Peroxide Fusion ICP
Sr, Strontium (ppm) 142 9 135 149 Peroxide Fusion ICP
Tb, Terbium (ppm) 0.77 0.065 0.68 0.87 Peroxide Fusion ICP
Th, Thorium (ppm) 13.7 0.94 12.9 14.5 Peroxide Fusion ICP
Ti, Titanium (wt.%) 0.129 0.006 0.122 0.136 Peroxide Fusion ICP
Tl, Thallium (ppm) 9.99 0.702 9.21 10.76 Peroxide Fusion ICP
Tm, Thulium (ppm) 0.18 0.017 0.16 0.20 Peroxide Fusion ICP
U, Uranium (ppm) 5.78 0.506 5.28 6.29 Peroxide Fusion ICP
V, Vanadium (ppm) 11.5 2.2 8.3 14.7 Peroxide Fusion ICP
W, Tungsten (ppm) 4.39 0.56 3.04 5.74 Peroxide Fusion ICP
Y, Yttrium (ppm) 17.6 0.95 16.5 18.7 Peroxide Fusion ICP
Yb, Ytterbium (ppm) 1.05 0.065 0.93 1.18 Peroxide Fusion ICP
Zn, Zinc (wt.%) 3.20 0.082 3.11 3.29 Peroxide Fusion ICP
Ag, Silver (ppm) 11.7 0.61 11.2 12.2 4-Acid Digestion
Al, Aluminium (wt.%) 6.68 0.273 6.46 6.90 4-Acid Digestion
As, Arsenic (ppm) 143 4 138 148 4-Acid Digestion
Be, Beryllium (ppm) 2.57 0.157 2.45 2.69 4-Acid Digestion
Bi, Bismuth (ppm) 8.61 0.483 8.26 8.97 4-Acid Digestion
Ca, Calcium (wt.%) 1.14 0.053 1.11 1.18 4-Acid Digestion
Cd, Cadmium (ppm) 83 5.3 80 86 4-Acid Digestion
Ce, Cerium (ppm) 72 10 67 78 4-Acid Digestion
Co, Cobalt (ppm) 4.21 0.236 3.99 4.44 4-Acid Digestion
Cr, Chromium (ppm) 13.3 1.6 11.6 14.9 4-Acid Digestion
Cs, Caesium (ppm) 5.94 0.209 5.68 6.21 4-Acid Digestion
Dy, Dysprosium (ppm) 3.52 0.175 3.22 3.82 4-Acid Digestion
Er, Erbium (ppm) 1.24 0.049 1.14 1.35 4-Acid Digestion
Eu, Europium (ppm) 1.36 0.109 1.19 1.54 4-Acid Digestion
Fe, Iron (wt.%) 3.98 0.131 3.87 4.08 4-Acid Digestion
Ga, Gallium (ppm) 20.6 0.63 19.8 21.3 4-Acid Digestion
Gd, Gadolinium (ppm) 5.46 0.206 5.13 5.79 4-Acid Digestion
Hf, Hafnium (ppm) 6.36 0.377 6.03 6.68 4-Acid Digestion
Ho, Holmium (ppm) 0.54 0.024 0.49 0.58 4-Acid Digestion
In, Indium (ppm) 2.12 0.098 2.01 2.22 4-Acid Digestion
K, Potassium (wt.%) 2.86 0.087 2.80 2.93 4-Acid Digestion
La, Lanthanum (ppm) 34.7 5.9 31.0 38.5 4-Acid Digestion
Li, Lithium (ppm) 17.9 0.72 17.2 18.6 4-Acid Digestion
Lu, Lutetium (ppm) 0.14 0.006 0.12 0.15 4-Acid Digestion
Mg, Magnesium (wt.%) 0.261 0.012 0.251 0.272 4-Acid Digestion
Mn, Manganese (wt.%) 0.443 0.015 0.433 0.453 4-Acid Digestion
Mo, Molybdenum (ppm) 12.3 0.90 11.6 13.0 4-Acid Digestion
Na, Sodium (wt.%) 1.91 0.058 1.86 1.96 4-Acid Digestion
Nb, Niobium (ppm) 14.8 1.34 13.9 15.7 4-Acid Digestion
Nd, Neodymium (ppm) 37.3 3.72 33.0 41.7 4-Acid Digestion
Ni, Nickel (ppm) 5.98 0.534 5.55 6.42 4-Acid Digestion
P, Phosphorus (wt.%) 0.030 0.001 0.029 0.031 4-Acid Digestion
Pb, Lead (wt.%) 0.822 0.019 0.804 0.840 4-Acid Digestion
Pr, Praseodymium (ppm) 9.74 0.99 8.57 10.91 4-Acid Digestion
Rb, Rubidium (ppm) 135 6 130 140 4-Acid Digestion
Re, Rhenium (ppm) 0.004 0.001 0.002 0.006 4-Acid Digestion
S, Sulphur (wt.%) 3.80 0.120 3.69 3.92 4-Acid Digestion
Sb, Antimony (ppm) 35.1 2.30 33.4 36.9 4-Acid Digestion
Sc, Scandium (ppm) 4.60 0.324 4.29 4.92 4-Acid Digestion
Sm, Samarium (ppm) 6.80 0.357 6.22 7.38 4-Acid Digestion
Sn, Tin (ppm) 3.57 0.171 3.37 3.76 4-Acid Digestion
Sr, Strontium (ppm) 130 7 125 135 4-Acid Digestion
Ta, Tantalum (ppm) 1.11 0.081 1.02 1.20 4-Acid Digestion
Tb, Terbium (ppm) 0.72 0.064 0.65 0.80 4-Acid Digestion
Te, Tellurium (ppm) 0.063 0.030 0.017 0.110 4-Acid Digestion
Th, Thorium (ppm) 12.7 1.3 11.7 13.7 4-Acid Digestion
Ti, Titanium (wt.%) 0.120 0.004 0.115 0.125 4-Acid Digestion
Tl, Thallium (ppm) 9.79 0.413 9.40 10.18 4-Acid Digestion
Tm, Thulium (ppm) 0.17 0.02 0.14 0.19 4-Acid Digestion
U, Uranium (ppm) 5.52 0.263 5.27 5.77 4-Acid Digestion
V, Vanadium (ppm) 11.5 1.06 10.6 12.3 4-Acid Digestion
W, Tungsten (ppm) 3.99 0.41 3.67 4.30 4-Acid Digestion
Y, Yttrium (ppm) 14.9 1.03 13.9 15.8 4-Acid Digestion
Yb, Ytterbium (ppm) 0.96 0.055 0.85 1.07 4-Acid Digestion
Zr, Zirconium (ppm) 229 10 221 237 4-Acid Digestion
Ag, Silver (ppm) 11.7 0.40 11.3 12.0 Aqua Regia Digestion
Al, Aluminium (wt.%) 0.565 0.064 0.531 0.599 Aqua Regia Digestion
As, Arsenic (ppm) 134 10 127 140 Aqua Regia Digestion
B, Boron (ppm) < 10.0 IND IND IND Aqua Regia Digestion
Be, Beryllium (ppm) 0.61 0.035 0.58 0.64 Aqua Regia Digestion
Bi, Bismuth (ppm) 8.81 0.295 8.48 9.15 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.966 0.035 0.936 0.996 Aqua Regia Digestion
Cd, Cadmium (ppm) 83 3.8 81 86 Aqua Regia Digestion
Ce, Cerium (ppm) 36.8 3.8 34.2 39.4 Aqua Regia Digestion
Co, Cobalt (ppm) 3.54 0.302 3.35 3.72 Aqua Regia Digestion
Cr, Chromium (ppm) 13.1 0.78 12.2 13.9 Aqua Regia Digestion
Cs, Caesium (ppm) 1.14 0.108 1.07 1.22 Aqua Regia Digestion
Cu, Copper (wt.%) 0.174 0.006 0.168 0.179 Aqua Regia Digestion
Fe, Iron (wt.%) 3.27 0.228 3.15 3.40 Aqua Regia Digestion
Ga, Gallium (ppm) 2.63 0.44 2.34 2.91 Aqua Regia Digestion
Hf, Hafnium (ppm) 1.46 0.095 1.38 1.54 Aqua Regia Digestion
Hg, Mercury (ppm) 1.72 0.137 1.58 1.85 Aqua Regia Digestion
In, Indium (ppm) 2.07 0.135 1.95 2.18 Aqua Regia Digestion
K, Potassium (wt.%) 0.276 0.026 0.261 0.290 Aqua Regia Digestion
La, Lanthanum (ppm) 17.7 2.5 16.2 19.1 Aqua Regia Digestion
Li, Lithium (ppm) 3.40 0.46 3.10 3.70 Aqua Regia Digestion
Lu, Lutetium (ppm) 0.045 0.005 0.036 0.054 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.119 0.009 0.113 0.125 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.434 0.012 0.421 0.447 Aqua Regia Digestion
Mo, Molybdenum (ppm) 11.6 0.66 11.1 12.2 Aqua Regia Digestion
Na, Sodium (wt.%) 0.059 0.006 0.056 0.062 Aqua Regia Digestion
Nb, Niobium (ppm) 0.70 0.15 0.60 0.79 Aqua Regia Digestion
Ni, Nickel (ppm) 5.32 0.457 4.99 5.65 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.025 0.002 0.024 0.026 Aqua Regia Digestion
Pb, Lead (wt.%) 0.826 0.021 0.807 0.845 Aqua Regia Digestion
Rb, Rubidium (ppm) 14.3 1.5 13.3 15.2 Aqua Regia Digestion
Re, Rhenium (ppm) 0.004 0.001 0.003 0.005 Aqua Regia Digestion
S, Sulphur (wt.%) 3.77 0.184 3.64 3.89 Aqua Regia Digestion
Sb, Antimony (ppm) 28.5 2.58 27.0 30.0 Aqua Regia Digestion
Sc, Scandium (ppm) 1.12 0.15 1.00 1.24 Aqua Regia Digestion
Sn, Tin (ppm) 0.95 0.17 0.83 1.07 Aqua Regia Digestion
Sr, Strontium (ppm) 20.7 1.61 19.8 21.6 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.010 IND IND IND Aqua Regia Digestion
Tb, Terbium (ppm) 0.38 0.05 0.32 0.44 Aqua Regia Digestion
Te, Tellurium (ppm) 0.050 0.015 0.028 0.073 Aqua Regia Digestion
Th, Thorium (ppm) 7.49 0.607 7.04 7.94 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.023 0.005 0.021 0.026 Aqua Regia Digestion
Tl, Thallium (ppm) 3.03 0.144 2.89 3.17 Aqua Regia Digestion
U, Uranium (ppm) 2.77 0.29 2.60 2.94 Aqua Regia Digestion
V, Vanadium (ppm) 3.11 0.48 2.88 3.35 Aqua Regia Digestion
W, Tungsten (ppm) 1.47 0.130 1.35 1.59 Aqua Regia Digestion
Y, Yttrium (ppm) 6.40 0.505 6.04 6.75 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.34 0.04 0.31 0.38 Aqua Regia Digestion
Zn, Zinc (wt.%) 3.18 0.090 3.11 3.25 Aqua Regia Digestion
Zr, Zirconium (ppm) 55 9 50 60 Aqua Regia Digestion
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