OREAS 604b

OREAS 604b 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. A small quantity of copper concentrate (from Sepon in Laos) was also added to help achieve the desired copper grade.

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 Limits Low 95% Confidence Limits High Method
Ag, Silver (ppm) 507 15 499 514 4-Acid Digestion
Cu, Copper (wt.%) 2.12 0.036 2.11 2.14 4-Acid Digestion
Au, Gold (ppm) 1.69 0.047 1.67 1.70 Pb Fire Assay
Ag, Silver (ppm) 493 9 489 498 Pb Fire Assay
Au, Gold (ppm) 1.61 0.110 1.53 1.69 Aqua Regia Digestion (sample weights 10-50g)
S, Sulphur (wt.%) 4.83 0.137 4.78 4.89 Infrared Combustion
Al, Aluminium (wt.%) 6.55 0.235 6.44 6.65 4-Acid Digestion
As, Arsenic (ppm) 1351 73 1316 1386 4-Acid Digestion
Be, Beryllium (ppm) 1.72 0.28 1.58 1.86 4-Acid Digestion
Bi, Bismuth (ppm) 40.8 3.23 39.3 42.3 4-Acid Digestion
Ca, Calcium (wt.%) 0.704 0.034 0.688 0.719 4-Acid Digestion
Cd, Cadmium (ppm) 7.05 0.537 6.80 7.31 4-Acid Digestion
Ce, Cerium (ppm) 45.3 4.00 42.8 47.8 4-Acid Digestion
Co, Cobalt (ppm) 10.4 0.67 10.1 10.7 4-Acid Digestion
Cr, Chromium (ppm) 29.7 4.7 27.6 31.9 4-Acid Digestion
Cs, Caesium (ppm) 3.89 0.237 3.77 4.00 4-Acid Digestion
Dy, Dysprosium (ppm) 2.13 0.112 2.06 2.20 4-Acid Digestion
Er, Erbium (ppm) 0.73 0.060 0.67 0.79 4-Acid Digestion
Eu, Europium (ppm) 0.85 0.13 0.71 0.98 4-Acid Digestion
Fe, Iron (wt.%) 4.25 0.131 4.20 4.30 4-Acid Digestion
Ga, Gallium (ppm) 28.1 1.99 27.1 29.0 4-Acid Digestion
Gd, Gadolinium (ppm) 3.22 0.176 3.06 3.38 4-Acid Digestion
Ge, Germanium (ppm) 0.20 0.05 0.16 0.25 4-Acid Digestion
Hf, Hafnium (ppm) 4.08 0.250 3.94 4.22 4-Acid Digestion
Ho, Holmium (ppm) 0.31 0.014 0.29 0.32 4-Acid Digestion
In, Indium (ppm) 2.25 0.151 2.18 2.32 4-Acid Digestion
K, Potassium (wt.%) 1.88 0.047 1.86 1.90 4-Acid Digestion
La, Lanthanum (ppm) 19.6 3.5 17.7 21.6 4-Acid Digestion
Li, Lithium (ppm) 28.1 2.37 27.1 29.1 4-Acid Digestion
Lu, Lutetium (ppb) 74.1 7.0 66.0 82.2 4-Acid Digestion
Mg, Magnesium (ppm) 1182 85 1147 1217 4-Acid Digestion
Mn, Manganese (ppm) 177 8 173 180 4-Acid Digestion
Mo, Molybdenum (ppm) 9.32 0.745 8.97 9.68 4-Acid Digestion
Na, Sodium (wt.%) 1.40 0.086 1.36 1.44 4-Acid Digestion
Nb, Niobium (ppm) 11.3 0.82 10.9 11.7 4-Acid Digestion
Nd, Neodymium (ppm) 22.1 2.3 19.5 24.6 4-Acid Digestion
Ni, Nickel (ppm) 17.3 1.14 16.8 17.7 4-Acid Digestion
P, Phosphorus (ppm) 449 26 436 463 4-Acid Digestion
Pb, Lead (ppm) 792 36 776 808 4-Acid Digestion
Pr, Praseodymium (ppm) 5.78 0.90 4.79 6.77 4-Acid Digestion
Rb, Rubidium (ppm) 77 2.5 76 78 4-Acid Digestion
S, Sulphur (wt.%) 4.76 0.182 4.68 4.84 4-Acid Digestion
Sb, Antimony (ppm) 214 13 208 220 4-Acid Digestion
Sc, Scandium (ppm) 5.09 0.264 4.96 5.22 4-Acid Digestion
Se, Selenium (ppm) 45.6 3.72 43.8 47.4 4-Acid Digestion
Sm, Samarium (ppm) 4.32 0.352 3.96 4.67 4-Acid Digestion
Sn, Tin (ppm) 9.00 0.570 8.68 9.31 4-Acid Digestion
Sr, Strontium (ppm) 336 44 316 357 4-Acid Digestion
Ta, Tantalum (ppm) 0.91 0.045 0.88 0.94 4-Acid Digestion
Tb, Terbium (ppm) 0.43 0.035 0.40 0.45 4-Acid Digestion
Te, Tellurium (ppm) 23.0 2.3 21.9 24.1 4-Acid Digestion
Th, Thorium (ppm) 8.36 1.65 7.47 9.25 4-Acid Digestion
Ti, Titanium (wt.%) 0.166 0.008 0.163 0.169 4-Acid Digestion
Tl, Thallium (ppm) 8.10 0.683 7.81 8.40 4-Acid Digestion
U, Uranium (ppm) 4.11 0.233 3.99 4.24 4-Acid Digestion
V, Vanadium (ppm) 33.3 1.59 32.6 33.9 4-Acid Digestion
W, Tungsten (ppm) 17.5 0.85 17.0 17.9 4-Acid Digestion
Y, Yttrium (ppm) 9.09 0.501 8.86 9.31 4-Acid Digestion
Yb, Ytterbium (ppm) 0.51 0.05 0.47 0.55 4-Acid Digestion
Zn, Zinc (wt.%) 0.117 0.003 0.116 0.118 4-Acid Digestion
Zr, Zirconium (ppm) 149 11 144 155 4-Acid Digestion
Ag, Silver (ppm) 508 9 503 513 Aqua Regia Digestion
Al, Aluminium (wt.%) 0.807 0.043 0.786 0.829 Aqua Regia Digestion
As, Arsenic (ppm) 1320 78 1286 1353 Aqua Regia Digestion
Be, Beryllium (ppm) 0.33 0.026 0.33 0.34 Aqua Regia Digestion
Bi, Bismuth (ppm) 40.2 2.35 39.3 41.1 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.421 0.021 0.412 0.431 Aqua Regia Digestion
Cd, Cadmium (ppm) 7.06 0.418 6.84 7.29 Aqua Regia Digestion
Ce, Cerium (ppm) 27.7 1.69 26.7 28.6 Aqua Regia Digestion
Co, Cobalt (ppm) 9.86 0.670 9.55 10.17 Aqua Regia Digestion
Cr, Chromium (ppm) 29.4 3.1 28.0 30.8 Aqua Regia Digestion
Cs, Caesium (ppm) 1.21 0.070 1.16 1.25 Aqua Regia Digestion
Cu, Copper (wt.%) 2.12 0.041 2.10 2.13 Aqua Regia Digestion
Fe, Iron (wt.%) 4.01 0.195 3.92 4.10 Aqua Regia Digestion
Ga, Gallium (ppm) 6.07 0.511 5.77 6.37 Aqua Regia Digestion
Ge, Germanium (ppm) 0.20 0.05 0.15 0.25 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.93 0.13 0.85 1.01 Aqua Regia Digestion
Hg, Mercury (ppm) 1.08 0.101 1.02 1.15 Aqua Regia Digestion
In, Indium (ppm) 2.16 0.099 2.11 2.21 Aqua Regia Digestion
K, Potassium (wt.%) 0.224 0.010 0.220 0.229 Aqua Regia Digestion
La, Lanthanum (ppm) 12.9 0.81 12.5 13.3 Aqua Regia Digestion
Li, Lithium (ppm) 8.25 0.95 7.75 8.76 Aqua Regia Digestion
Lu, Lutetium (ppb) 27.7 4.5 24.3 31.1 Aqua Regia Digestion
Mg, Magnesium (ppm) 704 71 672 736 Aqua Regia Digestion
Mn, Manganese (ppm) 153 8 149 156 Aqua Regia Digestion
Mo, Molybdenum (ppm) 8.77 0.430 8.58 8.97 Aqua Regia Digestion
Na, Sodium (wt.%) 0.058 0.008 0.054 0.061 Aqua Regia Digestion
Ni, Nickel (ppm) 17.0 1.23 16.5 17.6 Aqua Regia Digestion
P, Phosphorus (ppm) 184 12 178 190 Aqua Regia Digestion
Pb, Lead (ppm) 473 19 464 481 Aqua Regia Digestion
Rb, Rubidium (ppm) 13.7 0.93 13.1 14.2 Aqua Regia Digestion
S, Sulphur (wt.%) 4.07 0.186 3.98 4.15 Aqua Regia Digestion
Sb, Antimony (ppm) 170 21 161 180 Aqua Regia Digestion
Sc, Scandium (ppm) 1.39 0.16 1.31 1.47 Aqua Regia Digestion
Se, Selenium (ppm) 44.3 4.40 42.0 46.6 Aqua Regia Digestion
Sn, Tin (ppm) 7.19 0.268 7.04 7.34 Aqua Regia Digestion
Sr, Strontium (ppm) 36.9 4.3 34.5 39.3 Aqua Regia Digestion
Tb, Terbium (ppm) 0.25 0.05 0.21 0.30 Aqua Regia Digestion
Te, Tellurium (ppm) 24.3 1.39 23.5 25.0 Aqua Regia Digestion
Th, Thorium (ppm) 4.69 0.56 4.35 5.03 Aqua Regia Digestion
Ti, Titanium (ppm) 290 29 272 307 Aqua Regia Digestion
Tl, Thallium (ppm) 7.97 0.415 7.75 8.20 Aqua Regia Digestion
U, Uranium (ppm) 1.97 0.105 1.91 2.03 Aqua Regia Digestion
V, Vanadium (ppm) 11.9 1.11 11.4 12.4 Aqua Regia Digestion
W, Tungsten (ppm) 4.92 0.485 4.64 5.20 Aqua Regia Digestion
Y, Yttrium (ppm) 4.60 0.387 4.41 4.80 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.21 0.03 0.19 0.24 Aqua Regia Digestion
Zn, Zinc (wt.%) 0.112 0.003 0.111 0.113 Aqua Regia Digestion
Zr, Zirconium (ppm) 31.0 5.6 28.4 33.6 Aqua Regia Digestion
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