OREAS 600b

OREAS 600b 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 amount of chalcocite-rich ore from the Sepon Mine 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) 25.1 1.00 24.7 25.6 4-Acid Digestion
Cu, Copper (ppm) 499 13 493 505 4-Acid Digestion
Au, Gold (ppm) 0.204 0.007 0.201 0.207 Pb Fire Assay
Au, Gold (ppm) 0.200 0.008 0.195 0.205 Aqua Regia Digestion (sample weights 10-50g)
S, Sulphur (wt.%) 0.299 0.022 0.288 0.310 Infrared Combustion
Al, Aluminium (wt.%) 7.58 0.296 7.45 7.71 4-Acid Digestion
As, Arsenic (ppm) 99 6.8 96 102 4-Acid Digestion
Ba, Barium (ppm) 3397 189 3304 3489 4-Acid Digestion
Be, Beryllium (ppm) 3.14 0.47 2.91 3.38 4-Acid Digestion
Bi, Bismuth (ppm) 5.42 0.378 5.22 5.62 4-Acid Digestion
Ca, Calcium (wt.%) 1.26 0.066 1.23 1.29 4-Acid Digestion
Cd, Cadmium (ppm) 2.08 0.098 2.04 2.13 4-Acid Digestion
Ce, Cerium (ppm) 93 8.0 88 98 4-Acid Digestion
Co, Cobalt (ppm) 2.77 0.236 2.66 2.89 4-Acid Digestion
Cr, Chromium (ppm) 22.3 3.0 21.0 23.5 4-Acid Digestion
Cs, Caesium (ppm) 6.91 0.317 6.75 7.07 4-Acid Digestion
Dy, Dysprosium (ppm) 3.50 0.192 3.32 3.68 4-Acid Digestion
Er, Erbium (ppm) 1.01 0.086 0.93 1.09 4-Acid Digestion
Eu, Europium (ppm) 1.35 0.14 1.19 1.51 4-Acid Digestion
Fe, Iron (wt.%) 2.54 0.092 2.50 2.58 4-Acid Digestion
Ga, Gallium (ppm) 23.2 1.69 22.4 24.0 4-Acid Digestion
Gd, Gadolinium (ppm) 5.74 0.353 5.41 6.07 4-Acid Digestion
Ge, Germanium (ppm) 0.18 0.02 0.16 0.20 4-Acid Digestion
Hf, Hafnium (ppm) 6.89 0.443 6.66 7.12 4-Acid Digestion
Ho, Holmium (ppm) 0.49 0.047 0.44 0.54 4-Acid Digestion
In, Indium (ppm) 0.44 0.028 0.43 0.46 4-Acid Digestion
K, Potassium (wt.%) 3.03 0.075 3.00 3.06 4-Acid Digestion
La, Lanthanum (ppm) 44.1 5.1 41.6 46.7 4-Acid Digestion
Li, Lithium (ppm) 28.9 2.33 27.9 29.9 4-Acid Digestion
Lu, Lutetium (ppb) 67.4 10.2 54.5 80.3 4-Acid Digestion
Mg, Magnesium (ppm) 1229 69 1199 1259 4-Acid Digestion
Mn, Manganese (ppm) 293 12 288 299 4-Acid Digestion
Mo, Molybdenum (ppm) 5.43 0.396 5.28 5.59 4-Acid Digestion
Na, Sodium (wt.%) 2.76 0.095 2.72 2.80 4-Acid Digestion
Nb, Niobium (ppm) 18.6 1.37 18.0 19.3 4-Acid Digestion
Nd, Neodymium (ppm) 39.6 4.1 35.1 44.1 4-Acid Digestion
Ni, Nickel (ppm) 4.86 0.92 4.40 5.33 4-Acid Digestion
P, Phosphorus (ppm) 303 14 297 309 4-Acid Digestion
Pb, Lead (ppm) 119 4 118 121 4-Acid Digestion
Pr, Praseodymium (ppm) 10.7 0.89 9.6 11.7 4-Acid Digestion
Rb, Rubidium (ppm) 143 4 141 145 4-Acid Digestion
S, Sulphur (wt.%) 0.308 0.016 0.300 0.315 4-Acid Digestion
Sb, Antimony (ppm) 13.5 0.81 13.1 14.0 4-Acid Digestion
Sc, Scandium (ppm) 4.34 0.275 4.18 4.50 4-Acid Digestion
Se, Selenium (ppm) 3.33 0.36 3.00 3.66 4-Acid Digestion
Sm, Samarium (ppm) 7.92 0.547 7.30 8.54 4-Acid Digestion
Sn, Tin (ppm) 4.27 0.230 4.14 4.39 4-Acid Digestion
Sr, Strontium (ppm) 212 8 208 216 4-Acid Digestion
Ta, Tantalum (ppm) 1.48 0.097 1.43 1.53 4-Acid Digestion
Tb, Terbium (ppm) 0.77 0.10 0.67 0.86 4-Acid Digestion
Te, Tellurium (ppm) 2.05 0.179 1.97 2.14 4-Acid Digestion
Th, Thorium (ppm) 15.1 0.67 14.7 15.4 4-Acid Digestion
Ti, Titanium (wt.%) 0.120 0.005 0.117 0.122 4-Acid Digestion
Tl, Thallium (ppm) 1.02 0.065 0.99 1.06 4-Acid Digestion
U, Uranium (ppm) 5.97 0.361 5.77 6.17 4-Acid Digestion
V, Vanadium (ppm) 5.61 0.58 4.98 6.24 4-Acid Digestion
W, Tungsten (ppm) 4.63 0.49 4.43 4.82 4-Acid Digestion
Y, Yttrium (ppm) 15.0 0.78 14.6 15.3 4-Acid Digestion
Yb, Ytterbium (ppm) 0.56 0.06 0.49 0.64 4-Acid Digestion
Zn, Zinc (ppm) 404 14 399 410 4-Acid Digestion
Zr, Zirconium (ppm) 254 10 250 258 4-Acid Digestion
Ag, Silver (ppm) 25.1 1.67 24.4 25.8 Aqua Regia Digestion
Al, Aluminium (wt.%) 0.590 0.043 0.569 0.612 Aqua Regia Digestion
As, Arsenic (ppm) 96 7.5 93 100 Aqua Regia Digestion
Ba, Barium (ppm) 668 34 650 687 Aqua Regia Digestion
Be, Beryllium (ppm) 0.64 0.052 0.61 0.67 Aqua Regia Digestion
Bi, Bismuth (ppm) 5.57 0.197 5.47 5.66 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.817 0.029 0.804 0.830 Aqua Regia Digestion
Cd, Cadmium (ppm) 2.08 0.131 2.01 2.16 Aqua Regia Digestion
Ce, Cerium (ppm) 57 4.0 55 59 Aqua Regia Digestion
Co, Cobalt (ppm) 2.16 0.084 2.15 2.18 Aqua Regia Digestion
Cr, Chromium (ppm) 26.6 2.13 25.7 27.5 Aqua Regia Digestion
Cs, Caesium (ppm) 1.48 0.143 1.39 1.57 Aqua Regia Digestion
Cu, Copper (ppm) 502 18 494 510 Aqua Regia Digestion
Fe, Iron (wt.%) 2.05 0.109 2.00 2.10 Aqua Regia Digestion
Ga, Gallium (ppm) 3.39 0.190 3.27 3.50 Aqua Regia Digestion
Ge, Germanium (ppm) 0.081 0.016 0.062 0.100 Aqua Regia Digestion
Hf, Hafnium (ppm) 1.40 0.25 1.25 1.55 Aqua Regia Digestion
Hg, Mercury (ppm) 0.088 0.012 0.082 0.095 Aqua Regia Digestion
In, Indium (ppm) 0.40 0.014 0.40 0.40 Aqua Regia Digestion
K, Potassium (wt.%) 0.273 0.018 0.263 0.282 Aqua Regia Digestion
La, Lanthanum (ppm) 29.1 1.59 28.3 29.8 Aqua Regia Digestion
Li, Lithium (ppm) 9.92 0.927 9.44 10.40 Aqua Regia Digestion
Mg, Magnesium (ppm) 481 74 450 513 Aqua Regia Digestion
Mn, Manganese (ppm) 252 10 248 256 Aqua Regia Digestion
Mo, Molybdenum (ppm) 5.01 0.183 4.94 5.09 Aqua Regia Digestion
Na, Sodium (wt.%) 0.085 0.010 0.080 0.090 Aqua Regia Digestion
Ni, Nickel (ppm) 4.41 0.276 4.29 4.53 Aqua Regia Digestion
P, Phosphorus (ppm) 234 10 229 239 Aqua Regia Digestion
Pb, Lead (ppm) 83 4.2 81 85 Aqua Regia Digestion
Rb, Rubidium (ppm) 15.7 0.91 15.1 16.3 Aqua Regia Digestion
S, Sulphur (wt.%) 0.251 0.018 0.243 0.259 Aqua Regia Digestion
Sb, Antimony (ppm) 10.2 0.97 9.7 10.8 Aqua Regia Digestion
Sc, Scandium (ppm) 1.17 0.15 1.09 1.25 Aqua Regia Digestion
Se, Selenium (ppm) 3.05 0.36 2.85 3.26 Aqua Regia Digestion
Sn, Tin (ppm) 1.42 0.116 1.36 1.48 Aqua Regia Digestion
Sr, Strontium (ppm) 26.7 1.70 25.9 27.5 Aqua Regia Digestion
Tb, Terbium (ppm) 0.40 0.10 0.28 0.52 Aqua Regia Digestion
Te, Tellurium (ppm) 1.99 0.186 1.90 2.09 Aqua Regia Digestion
Th, Thorium (ppm) 9.41 0.820 8.95 9.87 Aqua Regia Digestion
Ti, Titanium (ppm) 299 35 278 319 Aqua Regia Digestion
Tl, Thallium (ppm) 0.47 0.038 0.45 0.49 Aqua Regia Digestion
U, Uranium (ppm) 3.08 0.200 2.97 3.19 Aqua Regia Digestion
V, Vanadium (ppm) 2.54 0.35 2.08 3.00 Aqua Regia Digestion
W, Tungsten (ppm) 2.44 0.30 2.32 2.56 Aqua Regia Digestion
Y, Yttrium (ppm) 7.51 0.591 7.21 7.81 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.23 0.03 0.19 0.27 Aqua Regia Digestion
Zn, Zinc (ppm) 329 9 325 332 Aqua Regia Digestion
Zr, Zirconium (ppm) 50 10 46 55 Aqua Regia Digestion
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