OREAS 905b

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:

  • Gold by fire assay with AAS, ICP-OES or ICP-MS finish
  • Gold by aqua regia digestion (15-30g sample weight) with AAS, ICP-OES 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
  • Copper by Sequential leach: acid leach, alkaline leach, residual leach and calculated total

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
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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