OREAS 602b

OREAS 602b 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.

Twenty five commercial analytical laboratories participated in the program to certify the elements reported in Table 1. The following methods were employed:

  • Gold via 25-50g fire assay with AAS finish (14 laboratories) and ICP-OES (10 laboratories) finish;
  • Gold via 10-40g aqua regia digestion with ICP-MS finish (10 laboratories) and AAS (2 laboratories) finish;
  • Sulphur by infra-red combustion analysis (19 laboratories);
  • 4-Acid digestion for full elemental suite ICP-OES/MS finish (up to 22 laboratories depending on the element).
  • Aqua regia digestion for full elemental suite ICP-OES finish (up to 22 laboratories depending on the element) and AAS finish (1 laboratory);
  • Gold by instrumental neutron activation analysis (INAA) on 20 x 85mg subsamples to confirm homogeneity (ANSTO, Lucas Heights).
Analyte Certified Value 1SD 95% Confidence Low 95% Confidence High Method
Ag, Silver (ppm) 119 4 118 121 4-Acid Digestion
Cu, Copper (wt.%) 0.496 0.010 0.492 0.501 4-Acid Digestion
Au, Gold (ppm) 2.29 0.094 2.25 2.33 Pb Fire Assay
Ag, Silver (ppm) 118 4 116 120 Pb Fire Assay
Au, Gold (ppm) 2.27 0.083 2.21 2.33 Aqua Regia Digestion (sample weights 10-50g)
S, Sulphur (wt.%) 2.15 0.092 2.11 2.19 Infrared Combustion
Al, Aluminium (wt.%) 5.38 0.169 5.31 5.45 4-Acid Digestion
As, Arsenic (ppm) 874 47 852 896 4-Acid Digestion
Be, Beryllium (ppm) 1.69 0.20 1.59 1.80 4-Acid Digestion
Bi, Bismuth (ppm) 58 4.3 56 60 4-Acid Digestion
Ca, Calcium (wt.%) 0.655 0.027 0.643 0.666 4-Acid Digestion
Cd, Cadmium (ppm) 4.89 0.290 4.75 5.04 4-Acid Digestion
Ce, Cerium (ppm) 51 4.7 49 54 4-Acid Digestion
Co, Cobalt (ppm) 5.08 0.243 4.97 5.19 4-Acid Digestion
Cr, Chromium (ppm) 33.5 4.1 31.6 35.3 4-Acid Digestion
Cs, Caesium (ppm) 3.64 0.171 3.55 3.72 4-Acid Digestion
Dy, Dysprosium (ppm) 2.06 0.25 1.79 2.33 4-Acid Digestion
Er, Erbium (ppm) 0.68 0.065 0.60 0.75 4-Acid Digestion
Eu, Europium (ppm) 0.80 0.14 0.65 0.96 4-Acid Digestion
Fe, Iron (wt.%) 2.52 0.085 2.49 2.56 4-Acid Digestion
Ga, Gallium (ppm) 24.3 1.50 23.6 25.0 4-Acid Digestion
Gd, Gadolinium (ppm) 3.12 0.238 2.85 3.40 4-Acid Digestion
Ge, Germanium (ppm) 0.16 0.03 0.12 0.20 4-Acid Digestion
Hf, Hafnium (ppm) 4.21 0.273 4.07 4.35 4-Acid Digestion
Ho, Holmium (ppm) 0.29 0.018 0.27 0.31 4-Acid Digestion
In, Indium (ppm) 1.50 0.091 1.45 1.54 4-Acid Digestion
K, Potassium (wt.%) 1.78 0.038 1.77 1.80 4-Acid Digestion
La, Lanthanum (ppm) 23.5 2.15 22.4 24.5 4-Acid Digestion
Li, Lithium (ppm) 20.3 1.45 19.7 20.9 4-Acid Digestion
Lu, Lutetium (ppb) 62 11 43 82 4-Acid Digestion
Mg, Magnesium (ppm) 759 53 737 781 4-Acid Digestion
Mn, Manganese (ppm) 188 7 185 191 4-Acid Digestion
Mo, Molybdenum (ppm) 7.45 0.327 7.31 7.59 4-Acid Digestion
Na, Sodium (wt.%) 1.40 0.065 1.37 1.42 4-Acid Digestion
Nb, Niobium (ppm) 12.0 0.72 11.7 12.4 4-Acid Digestion
Nd, Neodymium (ppm) 21.8 1.86 19.5 24.1 4-Acid Digestion
Ni, Nickel (ppm) 14.2 0.82 13.8 14.6 4-Acid Digestion
P, Phosphorus (ppm) 279 21 269 288 4-Acid Digestion
Pb, Lead (ppm) 493 19 485 501 4-Acid Digestion
Pr, Praseodymium (ppm) 6.52 0.450 5.98 7.06 4-Acid Digestion
Rb, Rubidium (ppm) 72 3.3 71 74 4-Acid Digestion
S, Sulphur (wt.%) 2.13 0.060 2.10 2.15 4-Acid Digestion
Sb, Antimony (ppm) 105 8 101 108 4-Acid Digestion
Sc, Scandium (ppm) 3.56 0.182 3.46 3.66 4-Acid Digestion
Se, Selenium (ppm) 24.1 2.5 22.9 25.3 4-Acid Digestion
Sm, Samarium (ppm) 4.26 0.50 3.72 4.80 4-Acid Digestion
Sn, Tin (ppm) 8.96 0.391 8.75 9.18 4-Acid Digestion
Sr, Strontium (ppm) 260 13 254 266 4-Acid Digestion
Ta, Tantalum (ppm) 0.93 0.043 0.91 0.96 4-Acid Digestion
Tb, Terbium (ppm) 0.43 0.04 0.39 0.46 4-Acid Digestion
Te, Tellurium (ppm) 34.4 2.64 33.1 35.7 4-Acid Digestion
Th, Thorium (ppm) 9.11 0.900 8.61 9.61 4-Acid Digestion
Ti, Titanium (wt.%) 0.149 0.009 0.146 0.153 4-Acid Digestion
Tl, Thallium (ppm) 2.17 0.162 2.08 2.25 4-Acid Digestion
U, Uranium (ppm) 3.80 0.216 3.69 3.91 4-Acid Digestion
V, Vanadium (ppm) 15.8 1.10 15.3 16.3 4-Acid Digestion
W, Tungsten (ppm) 13.8 0.90 13.4 14.2 4-Acid Digestion
Y, Yttrium (ppm) 8.69 0.350 8.54 8.84 4-Acid Digestion
Yb, Ytterbium (ppm) 0.51 0.07 0.43 0.59 4-Acid Digestion
Zn, Zinc (ppm) 764 24 755 773 4-Acid Digestion
Zr, Zirconium (ppm) 149 8 145 152 4-Acid Digestion
Ag, Silver (ppm) 119 3 118 120 Aqua Regia Digestion
Al, Aluminium (wt.%) 0.546 0.019 0.537 0.555 Aqua Regia Digestion
As, Arsenic (ppm) 857 43 838 876 Aqua Regia Digestion
Be, Beryllium (ppm) 0.34 0.04 0.32 0.36 Aqua Regia Digestion
Bi, Bismuth (ppm) 57 3.4 55 58 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.418 0.015 0.412 0.425 Aqua Regia Digestion
Cd, Cadmium (ppm) 4.93 0.279 4.78 5.07 Aqua Regia Digestion
Ce, Cerium (ppm) 28.4 1.57 27.5 29.3 Aqua Regia Digestion
Co, Cobalt (ppm) 4.78 0.225 4.69 4.87 Aqua Regia Digestion
Cr, Chromium (ppm) 35.3 3.34 33.8 36.8 Aqua Regia Digestion
Cs, Caesium (ppm) 0.83 0.045 0.80 0.85 Aqua Regia Digestion
Cu, Copper (wt.%) 0.495 0.015 0.489 0.502 Aqua Regia Digestion
Fe, Iron (wt.%) 2.26 0.110 2.21 2.31 Aqua Regia Digestion
Ga, Gallium (ppm) 4.47 0.434 4.22 4.72 Aqua Regia Digestion
Ge, Germanium (ppm) 0.11 0.02 0.09 0.14 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.91 0.083 0.86 0.96 Aqua Regia Digestion
Hg, Mercury (ppm) 0.48 0.034 0.46 0.50 Aqua Regia Digestion
In, Indium (ppm) 1.43 0.063 1.40 1.46 Aqua Regia Digestion
K, Potassium (wt.%) 0.182 0.012 0.176 0.188 Aqua Regia Digestion
La, Lanthanum (ppm) 14.4 0.85 14.0 14.8 Aqua Regia Digestion
Li, Lithium (ppm) 6.04 0.61 5.73 6.36 Aqua Regia Digestion
Mg, Magnesium (ppm) 340 50 320 361 Aqua Regia Digestion
Mn, Manganese (ppm) 163 8 159 166 Aqua Regia Digestion
Mo, Molybdenum (ppm) 7.11 0.348 6.94 7.29 Aqua Regia Digestion
Na, Sodium (wt.%) 0.052 0.008 0.048 0.055 Aqua Regia Digestion
Ni, Nickel (ppm) 14.1 0.94 13.7 14.6 Aqua Regia Digestion
P, Phosphorus (ppm) 139 8 135 143 Aqua Regia Digestion
Pb, Lead (ppm) 378 21 368 387 Aqua Regia Digestion
Rb, Rubidium (ppm) 8.65 0.614 8.26 9.03 Aqua Regia Digestion
S, Sulphur (wt.%) 1.56 0.081 1.53 1.60 Aqua Regia Digestion
Sb, Antimony (ppm) 86 9 82 90 Aqua Regia Digestion
Sc, Scandium (ppm) 0.93 0.10 0.88 0.98 Aqua Regia Digestion
Se, Selenium (ppm) 23.6 1.82 22.6 24.6 Aqua Regia Digestion
Sn, Tin (ppm) 6.98 0.240 6.87 7.09 Aqua Regia Digestion
Sr, Strontium (ppm) 33.9 2.93 32.4 35.4 Aqua Regia Digestion
Te, Tellurium (ppm) 35.5 1.51 34.7 36.3 Aqua Regia Digestion
Th, Thorium (ppm) 5.15 0.64 4.79 5.51 Aqua Regia Digestion
Ti, Titanium (ppm) 163 16 153 173 Aqua Regia Digestion
Tl, Thallium (ppm) 1.89 0.149 1.81 1.97 Aqua Regia Digestion
U, Uranium (ppm) 1.72 0.097 1.66 1.77 Aqua Regia Digestion
V, Vanadium (ppm) 5.01 0.57 4.75 5.27 Aqua Regia Digestion
W, Tungsten (ppm) 5.82 0.543 5.56 6.09 Aqua Regia Digestion
Y, Yttrium (ppm) 4.00 0.303 3.85 4.16 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.17 0.03 0.15 0.20 Aqua Regia Digestion
Zn, Zinc (ppm) 722 29 709 734 Aqua Regia Digestion
Zr, Zirconium (ppm) 30.8 5.9 28.1 33.6 Aqua Regia Digestion
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