OREAS 601b

OREAS 601b 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 Low 95% Confidence High Method
Ag, Silver (ppm) 50.1 1.74 49.4 50.9 4-Acid Digestion
Cu, Copper (wt.%) 0.101 0.002 0.100 0.102 4-Acid Digestion
Au, Gold (ppm) 0.775 0.021 0.767 0.782 Pb Fire Assay
Au, Gold (ppm) 0.761 0.033 0.741 0.780 Aqua Regia Digestion (sample weights 10-50g)
S, Sulphur (wt.%) 1.49 0.072 1.46 1.52 Infrared Combustion
Al, Aluminium (wt.%) 6.63 0.223 6.53 6.73 4-Acid Digestion
As, Arsenic (ppm) 284 18 275 293 4-Acid Digestion
Be, Beryllium (ppm) 2.24 0.33 2.08 2.41 4-Acid Digestion
Bi, Bismuth (ppm) 18.0 1.14 17.4 18.6 4-Acid Digestion
Ca, Calcium (wt.%) 0.887 0.044 0.867 0.906 4-Acid Digestion
Cd, Cadmium (ppm) 2.05 0.111 2.00 2.10 4-Acid Digestion
Ce, Cerium (ppm) 70 8 65 75 4-Acid Digestion
Co, Cobalt (ppm) 2.97 0.184 2.89 3.06 4-Acid Digestion
Cr, Chromium (ppm) 23.7 3.0 22.3 25.1 4-Acid Digestion
Cs, Caesium (ppm) 4.88 0.185 4.79 4.97 4-Acid Digestion
Dy, Dysprosium (ppm) 2.54 0.160 2.38 2.71 4-Acid Digestion
Er, Erbium (ppm) 0.80 0.061 0.74 0.86 4-Acid Digestion
Eu, Europium (ppm) 0.97 0.11 0.83 1.11 4-Acid Digestion
Fe, Iron (wt.%) 2.29 0.081 2.25 2.32 4-Acid Digestion
Ga, Gallium (ppm) 23.4 1.78 22.5 24.2 4-Acid Digestion
Gd, Gadolinium (ppm) 4.14 0.311 3.78 4.50 4-Acid Digestion
Ge, Germanium (ppm) 0.15 0.04 0.10 0.20 4-Acid Digestion
Hf, Hafnium (ppm) 5.09 0.296 4.94 5.25 4-Acid Digestion
Ho, Holmium (ppm) 0.38 0.04 0.35 0.42 4-Acid Digestion
In, Indium (ppm) 0.47 0.026 0.46 0.48 4-Acid Digestion
K, Potassium (wt.%) 2.41 0.075 2.38 2.44 4-Acid Digestion
La, Lanthanum (ppm) 33.5 2.52 32.2 34.8 4-Acid Digestion
Li, Lithium (ppm) 22.6 1.98 21.7 23.4 4-Acid Digestion
Lu, Lutetium (ppb) 73 13 58 88 4-Acid Digestion
Mg, Magnesium (ppm) 996 66 968 1024 4-Acid Digestion
Mn, Manganese (ppm) 222 8 219 225 4-Acid Digestion
Mo, Molybdenum (ppm) 5.22 0.471 5.00 5.44 4-Acid Digestion
Na, Sodium (wt.%) 1.90 0.090 1.86 1.94 4-Acid Digestion
Nb, Niobium (ppm) 14.4 1.04 13.9 14.9 4-Acid Digestion
Nd, Neodymium (ppm) 28.5 2.19 25.6 31.4 4-Acid Digestion
Ni, Nickel (ppm) 6.54 0.67 6.16 6.91 4-Acid Digestion
P, Phosphorus (ppm) 292 15 286 297 4-Acid Digestion
Pb, Lead (ppm) 318 16 311 325 4-Acid Digestion
Pr, Praseodymium (ppm) 8.55 0.572 7.81 9.29 4-Acid Digestion
Rb, Rubidium (ppm) 98 3.5 96 99 4-Acid Digestion
S, Sulphur (wt.%) 1.50 0.036 1.48 1.51 4-Acid Digestion
Sb, Antimony (ppm) 22.9 2.09 21.9 23.9 4-Acid Digestion
Sc, Scandium (ppm) 3.77 0.239 3.64 3.90 4-Acid Digestion
Se, Selenium (ppm) 10.6 1.1 10.0 11.1 4-Acid Digestion
Sm, Samarium (ppm) 5.77 0.432 5.24 6.30 4-Acid Digestion
Sn, Tin (ppm) 3.36 0.177 3.26 3.45 4-Acid Digestion
Sr, Strontium (ppm) 241 12 235 247 4-Acid Digestion
Ta, Tantalum (ppm) 1.11 0.076 1.07 1.15 4-Acid Digestion
Tb, Terbium (ppm) 0.52 0.07 0.44 0.60 4-Acid Digestion
Te, Tellurium (ppm) 12.6 0.96 12.1 13.1 4-Acid Digestion
Th, Thorium (ppm) 11.9 0.82 11.5 12.3 4-Acid Digestion
Ti, Titanium (wt.%) 0.135 0.005 0.132 0.137 4-Acid Digestion
Tl, Thallium (ppm) 1.44 0.092 1.39 1.49 4-Acid Digestion
Tm, Thulium (ppb) < 100 IND IND IND 4-Acid Digestion
U, Uranium (ppm) 4.64 0.216 4.53 4.75 4-Acid Digestion
V, Vanadium (ppm) 12.1 0.88 11.7 12.6 4-Acid Digestion
W, Tungsten (ppm) 6.13 0.339 6.00 6.27 4-Acid Digestion
Y, Yttrium (ppm) 11.1 0.51 10.9 11.3 4-Acid Digestion
Yb, Ytterbium (ppm) 0.54 0.06 0.48 0.61 4-Acid Digestion
Zn, Zinc (ppm) 318 6 316 320 4-Acid Digestion
Zr, Zirconium (ppm) 186 11 181 191 4-Acid Digestion
Ag, Silver (ppm) 50.0 2.86 48.8 51.2 Aqua Regia Digestion
Al, Aluminium (wt.%) 0.630 0.035 0.613 0.646 Aqua Regia Digestion
As, Arsenic (ppm) 276 17 269 284 Aqua Regia Digestion
Be, Beryllium (ppm) 0.47 0.041 0.46 0.49 Aqua Regia Digestion
Bi, Bismuth (ppm) 18.0 1.58 17.3 18.8 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.578 0.030 0.565 0.591 Aqua Regia Digestion
Cd, Cadmium (ppm) 2.04 0.177 1.95 2.13 Aqua Regia Digestion
Ce, Cerium (ppm) 38.5 2.32 37.2 39.9 Aqua Regia Digestion
Co, Cobalt (ppm) 2.55 0.121 2.50 2.60 Aqua Regia Digestion
Cr, Chromium (ppm) 24.6 2.26 23.7 25.5 Aqua Regia Digestion
Cs, Caesium (ppm) 1.15 0.092 1.09 1.20 Aqua Regia Digestion
Cu, Copper (wt.%) 0.101 0.003 0.100 0.102 Aqua Regia Digestion
Fe, Iron (wt.%) 1.94 0.114 1.89 1.99 Aqua Regia Digestion
Ga, Gallium (ppm) 3.77 0.189 3.67 3.87 Aqua Regia Digestion
Ge, Germanium (ppm) 0.084 0.024 0.062 0.106 Aqua Regia Digestion
Hf, Hafnium (ppm) 1.11 0.107 1.04 1.17 Aqua Regia Digestion
Hg, Mercury (ppm) 0.20 0.02 0.18 0.21 Aqua Regia Digestion
In, Indium (ppm) 0.42 0.016 0.42 0.43 Aqua Regia Digestion
K, Potassium (wt.%) 0.246 0.019 0.236 0.256 Aqua Regia Digestion
La, Lanthanum (ppm) 19.9 1.69 19.2 20.7 Aqua Regia Digestion
Li, Lithium (ppm) 7.78 0.695 7.42 8.13 Aqua Regia Digestion
Mg, Magnesium (ppm) 411 20 400 423 Aqua Regia Digestion
Mn, Manganese (ppm) 192 8 188 195 Aqua Regia Digestion
Mo, Molybdenum (ppm) 4.83 0.281 4.73 4.94 Aqua Regia Digestion
Na, Sodium (wt.%) 0.067 0.008 0.063 0.070 Aqua Regia Digestion
Ni, Nickel (ppm) 6.39 0.419 6.21 6.58 Aqua Regia Digestion
P, Phosphorus (ppm) 178 8 174 181 Aqua Regia Digestion
Pb, Lead (ppm) 234 14 227 240 Aqua Regia Digestion
Rb, Rubidium (ppm) 11.9 0.71 11.5 12.3 Aqua Regia Digestion
S, Sulphur (wt.%) 0.807 0.038 0.789 0.826 Aqua Regia Digestion
Sb, Antimony (ppm) 18.0 2.2 17.0 19.1 Aqua Regia Digestion
Sc, Scandium (ppm) 1.00 0.13 0.94 1.07 Aqua Regia Digestion
Se, Selenium (ppm) 10.0 1.2 9.4 10.6 Aqua Regia Digestion
Sn, Tin (ppm) 1.19 0.112 1.13 1.26 Aqua Regia Digestion
Sr, Strontium (ppm) 33.2 2.95 31.8 34.7 Aqua Regia Digestion
Tb, Terbium (ppm) 0.28 0.06 0.21 0.35 Aqua Regia Digestion
Te, Tellurium (ppm) 13.0 0.83 12.6 13.4 Aqua Regia Digestion
Th, Thorium (ppm) 6.96 0.73 6.56 7.36 Aqua Regia Digestion
Ti, Titanium (ppm) 220 22 207 233 Aqua Regia Digestion
Tl, Thallium (ppm) 1.08 0.084 1.03 1.12 Aqua Regia Digestion
U, Uranium (ppm) 2.22 0.119 2.15 2.30 Aqua Regia Digestion
V, Vanadium (ppm) 3.83 0.51 3.59 4.06 Aqua Regia Digestion
W, Tungsten (ppm) 1.86 0.184 1.76 1.96 Aqua Regia Digestion
Y, Yttrium (ppm) 5.34 0.528 5.08 5.60 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.20 0.020 0.18 0.23 Aqua Regia Digestion
Zn, Zinc (ppm) 267 7 263 270 Aqua Regia Digestion
Zr, Zirconium (ppm) 38.3 5.5 35.6 40.9 Aqua Regia Digestion
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