OREAS 602c

OREAS 602c was prepared from a blend of silver-copper-gold bearing ores from Evolution Mining’s Mount Carlton Operation in Queensland, Australia and argillic rhyodacite waste rock sourced from a quarry east of Melbourne, Australia. Small quantities of copper concentrate (Sepon, Laos) and copper-gold concentrate (Mount Carlton) were added to help achieve the desired copper and gold grades.

The mineralisation assemblage at Mount Carlton consists of pyrite, enargite/tennantite, tetrahedrite, digenite, covellite, sphalerite, galena, alunite, dickite, kaolinite and vuggy silica, hosted in advanced argillic altered rhyodacite containing sulphur-salts.

The following methods were employed:

  • Au by fire assay with ICP-OES finish;
  • Au by aqua regia digestion with ICP-MS finish;
  • Total S by infra-red combustion analysis;
  • Full elemental suite by 4-Acid digestion with ICP-OES/MS finish, over range Cu by ore-grade digestion;
  • Full elemental suite by aqua regia digestion with ICP-OES/MS finish, over range Cu by ore-grade digestion;
  • Au by instrumental neutron activation analysis (INAA) on 20 x 85 mg subsamples to confirm homogeneity (ANSTO, Lucas Heights).

Indicative values for Sulphate Sulphur and Sulphide Sulphur (among others) are also available.

Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
Ag, Silver (ppm) 122 3 118 125 4-Acid Digestion
Cu, Copper (wt.%) 0.508 0.008 0.495 0.521 4-Acid Digestion
Au, Gold (ppm) 2.01 0.078 1.98 2.04 Pb Fire Assay
Au, Gold (ppm) 2.00 0.093 1.95 2.04 Aqua Regia Digestion (sample weights 10-50g)
S, Sulphur (wt.%) 2.33 0.070 2.27 2.40 Infrared Combustion
Al, Aluminium (wt.%) 6.69 0.290 6.46 6.93 4-Acid Digestion
As, Arsenic (wt.%) 0.169 0.008 0.162 0.176 4-Acid Digestion
Ba, Barium (wt.%) 0.107 0.054 0.082 0.131 4-Acid Digestion
Be, Beryllium (ppm) 1.59 0.123 1.49 1.70 4-Acid Digestion
Bi, Bismuth (ppm) 58 3.1 56 60 4-Acid Digestion
Ca, Calcium (wt.%) 0.421 0.018 0.407 0.435 4-Acid Digestion
Cd, Cadmium (ppm) 23.6 0.75 23.0 24.2 4-Acid Digestion
Ce, Cerium (ppm) 58 4.7 55 61 4-Acid Digestion
Co, Cobalt (ppm) 10.1 0.52 9.8 10.5 4-Acid Digestion
Cr, Chromium (ppm) 20.5 2.1 18.7 22.3 4-Acid Digestion
Cs, Caesium (ppm) 4.18 0.133 4.01 4.35 4-Acid Digestion
Dy, Dysprosium (ppm) 2.70 0.115 2.51 2.89 4-Acid Digestion
Er, Erbium (ppm) 1.25 0.066 1.14 1.35 4-Acid Digestion
Eu, Europium (ppm) 1.02 0.14 0.90 1.14 4-Acid Digestion
Fe, Iron (wt.%) 2.87 0.087 2.80 2.94 4-Acid Digestion
Ga, Gallium (ppm) 17.4 0.77 16.7 18.2 4-Acid Digestion
Gd, Gadolinium (ppm) 3.89 0.388 3.49 4.29 4-Acid Digestion
Ge, Germanium (ppm) 0.18 0.06 0.13 0.23 4-Acid Digestion
Hf, Hafnium (ppm) 3.49 0.191 3.28 3.69 4-Acid Digestion
Ho, Holmium (ppm) 0.44 0.041 0.39 0.48 4-Acid Digestion
In, Indium (ppm) 1.32 0.055 1.27 1.38 4-Acid Digestion
K, Potassium (wt.%) 5.67 0.387 5.39 5.94 4-Acid Digestion
La, Lanthanum (ppm) 29.6 2.95 27.9 31.4 4-Acid Digestion
Li, Lithium (ppm) 25.1 1.35 24.1 26.2 4-Acid Digestion
Lu, Lutetium (ppm) 0.16 0.02 0.14 0.18 4-Acid Digestion
Mg, Magnesium (wt.%) 0.066 0.004 0.064 0.067 4-Acid Digestion
Mn, Manganese (wt.%) 0.025 0.001 0.024 0.026 4-Acid Digestion
Mo, Molybdenum (ppm) 26.0 1.13 25.0 26.9 4-Acid Digestion
Na, Sodium (wt.%) 0.856 0.045 0.825 0.887 4-Acid Digestion
Nb, Niobium (ppm) 9.66 0.557 9.25 10.08 4-Acid Digestion
Nd, Neodymium (ppm) 25.9 1.06 24.6 27.3 4-Acid Digestion
Ni, Nickel (ppm) 10.1 0.36 9.6 10.6 4-Acid Digestion
P, Phosphorus (wt.%) 0.035 0.001 0.033 0.036 4-Acid Digestion
Pb, Lead (wt.%) 0.240 0.008 0.232 0.248 4-Acid Digestion
Pr, Praseodymium (ppm) 6.77 0.417 6.29 7.24 4-Acid Digestion
Rb, Rubidium (ppm) 259 22 245 272 4-Acid Digestion
Re, Rhenium (ppm) 0.049 0.004 0.043 0.056 4-Acid Digestion
S, Sulphur (wt.%) 2.36 0.067 2.29 2.42 4-Acid Digestion
Sb, Antimony (ppm) 111 3 107 116 4-Acid Digestion
Sc, Scandium (ppm) 5.39 0.335 5.14 5.65 4-Acid Digestion
Se, Selenium (ppm) 9.88 1.10 8.86 10.90 4-Acid Digestion
Sm, Samarium (ppm) 4.94 0.286 4.69 5.18 4-Acid Digestion
Sn, Tin (ppm) 6.69 0.365 6.35 7.03 4-Acid Digestion
Sr, Strontium (ppm) 282 15 271 293 4-Acid Digestion
Ta, Tantalum (ppm) 0.72 0.08 0.66 0.78 4-Acid Digestion
Tb, Terbium (ppm) 0.50 0.048 0.46 0.54 4-Acid Digestion
Te, Tellurium (ppm) 12.8 1.07 12.0 13.6 4-Acid Digestion
Th, Thorium (ppm) 9.03 0.866 8.51 9.56 4-Acid Digestion
Ti, Titanium (wt.%) 0.226 0.008 0.219 0.233 4-Acid Digestion
Tl, Thallium (ppm) 7.77 0.444 7.48 8.06 4-Acid Digestion
Tm, Thulium (ppm) 0.17 0.02 0.15 0.20 4-Acid Digestion
U, Uranium (ppm) 3.24 0.181 3.10 3.38 4-Acid Digestion
V, Vanadium (ppm) 35.5 1.67 34.2 36.8 4-Acid Digestion
W, Tungsten (ppm) 4.13 0.350 3.81 4.44 4-Acid Digestion
Y, Yttrium (ppm) 12.5 0.60 12.0 13.0 4-Acid Digestion
Yb, Ytterbium (ppm) 1.15 0.093 1.06 1.24 4-Acid Digestion
Zn, Zinc (wt.%) 0.250 0.009 0.243 0.257 4-Acid Digestion
Zr, Zirconium (ppm) 121 4 117 126 4-Acid Digestion
Ag, Silver (ppm) 121 4 118 124 Aqua Regia Digestion
Al, Aluminium (wt.%) 0.597 0.060 0.567 0.627 Aqua Regia Digestion
As, Arsenic (wt.%) 0.169 0.009 0.164 0.174 Aqua Regia Digestion
B, Boron (ppm) < 10.0 IND IND IND Aqua Regia Digestion
Be, Beryllium (ppm) 0.35 0.027 0.32 0.37 Aqua Regia Digestion
Bi, Bismuth (ppm) 60 2.3 58 62 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.290 0.013 0.280 0.300 Aqua Regia Digestion
Cd, Cadmium (ppm) 23.6 1.12 22.9 24.3 Aqua Regia Digestion
Ce, Cerium (ppm) 24.5 3.8 22.5 26.4 Aqua Regia Digestion
Co, Cobalt (ppm) 9.91 0.466 9.48 10.35 Aqua Regia Digestion
Cr, Chromium (ppm) 20.9 1.23 19.8 21.9 Aqua Regia Digestion
Cs, Caesium (ppm) 1.14 0.106 1.07 1.21 Aqua Regia Digestion
Cu, Copper (wt.%) 0.502 0.012 0.490 0.515 Aqua Regia Digestion
Dy, Dysprosium (ppm) 1.18 0.17 1.00 1.36 Aqua Regia Digestion
Er, Erbium (ppm) 0.47 0.047 0.42 0.52 Aqua Regia Digestion
Eu, Europium (ppm) 0.39 0.07 0.31 0.46 Aqua Regia Digestion
Fe, Iron (wt.%) 2.65 0.134 2.58 2.73 Aqua Regia Digestion
Ga, Gallium (ppm) 3.16 0.270 2.98 3.34 Aqua Regia Digestion
Gd, Gadolinium (ppm) 1.73 0.35 1.42 2.05 Aqua Regia Digestion
Ge, Germanium (ppm) 0.11 0.02 0.09 0.13 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.73 0.08 0.68 0.78 Aqua Regia Digestion
Hg, Mercury (ppm) 0.55 0.033 0.51 0.59 Aqua Regia Digestion
Ho, Holmium (ppm) 0.18 0.010 0.16 0.20 Aqua Regia Digestion
In, Indium (ppm) 1.33 0.081 1.27 1.39 Aqua Regia Digestion
K, Potassium (wt.%) 0.484 0.029 0.467 0.501 Aqua Regia Digestion
La, Lanthanum (ppm) 12.5 2.0 11.5 13.5 Aqua Regia Digestion
Li, Lithium (ppm) 1.96 0.33 1.76 2.17 Aqua Regia Digestion
Lu, Lutetium (ppm) 0.059 0.005 0.051 0.068 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.025 0.004 0.024 0.027 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.018 0.001 0.017 0.018 Aqua Regia Digestion
Mo, Molybdenum (ppm) 25.0 1.23 24.0 25.9 Aqua Regia Digestion
Na, Sodium (wt.%) 0.031 0.002 0.029 0.032 Aqua Regia Digestion
Nb, Niobium (ppm) 0.41 0.11 0.34 0.48 Aqua Regia Digestion
Nd, Neodymium (ppm) 11.7 3.2 8.8 14.6 Aqua Regia Digestion
Ni, Nickel (ppm) 9.49 0.501 9.12 9.86 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.018 0.002 0.017 0.020 Aqua Regia Digestion
Pb, Lead (wt.%) 0.229 0.009 0.222 0.236 Aqua Regia Digestion
Rb, Rubidium (ppm) 21.1 2.3 19.8 22.5 Aqua Regia Digestion
Re, Rhenium (ppm) 0.049 0.004 0.045 0.053 Aqua Regia Digestion
S, Sulphur (wt.%) 2.19 0.088 2.14 2.24 Aqua Regia Digestion
Sb, Antimony (ppm) 91 8.6 86 95 Aqua Regia Digestion
Sc, Scandium (ppm) 1.35 0.16 1.23 1.46 Aqua Regia Digestion
Se, Selenium (ppm) 9.73 0.850 8.94 10.52 Aqua Regia Digestion
Sm, Samarium (ppm) 2.10 0.46 1.69 2.51 Aqua Regia Digestion
Sn, Tin (ppm) 5.40 0.525 5.08 5.72 Aqua Regia Digestion
Sr, Strontium (ppm) 56 10 51 61 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.010 IND IND IND Aqua Regia Digestion
Tb, Terbium (ppm) 0.23 0.04 0.20 0.26 Aqua Regia Digestion
Te, Tellurium (ppm) 12.8 0.98 12.2 13.4 Aqua Regia Digestion
Th, Thorium (ppm) 4.48 0.61 4.17 4.79 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.011 0.002 0.010 0.012 Aqua Regia Digestion
Tl, Thallium (ppm) 2.36 0.140 2.25 2.47 Aqua Regia Digestion
U, Uranium (ppm) 1.43 0.140 1.34 1.51 Aqua Regia Digestion
V, Vanadium (ppm) 9.91 1.10 9.04 10.79 Aqua Regia Digestion
W, Tungsten (ppm) 1.77 0.32 1.61 1.92 Aqua Regia Digestion
Y, Yttrium (ppm) 5.02 0.51 4.73 5.31 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.44 0.037 0.38 0.50 Aqua Regia Digestion
Zn, Zinc (wt.%) 0.245 0.008 0.240 0.251 Aqua Regia Digestion
Zr, Zirconium (ppm) 28.1 3.1 26.4 29.8 Aqua Regia Digestion
S-(Sulphate), Sulphur as SO4.2- (wt.%) 0.408 0.126 0.341 0.474 Alkaline Leach
S-(Sulphide), Sulphur as S2- (wt.%) 1.81 0.21 1.68 1.93 Alkaline Leach
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