OREAS 603b

OREAS 603b 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) 301 10 296 305 4-Acid Digestion
Cu, Copper (wt.%) 0.973 0.023 0.963 0.983 4-Acid Digestion
Au, Gold (ppm) 5.21 0.209 5.12 5.29 Pb Fire Assay
Ag, Silver (ppm) 297 8 293 301 Pb Fire Assay
Au, Gold (ppm) 5.19 0.297 4.97 5.40 Aqua Regia Digestion (sample weights 10-50g)
S, Sulphur (wt.%) 4.57 0.136 4.51 4.63 Infrared Combustion
Al, Aluminium (wt.%) 6.48 0.286 6.36 6.61 4-Acid Digestion
As, Arsenic (ppm) 2433 101 2383 2483 4-Acid Digestion
Be, Beryllium (ppm) 1.57 0.21 1.46 1.67 4-Acid Digestion
Bi, Bismuth (ppm) 154 10 150 159 4-Acid Digestion
Ca, Calcium (wt.%) 0.618 0.027 0.607 0.630 4-Acid Digestion
Cd, Cadmium (ppm) 12.3 0.81 12.0 12.7 4-Acid Digestion
Ce, Cerium (ppm) 47.9 3.76 45.6 50.3 4-Acid Digestion
Co, Cobalt (ppm) 9.38 0.768 9.01 9.76 4-Acid Digestion
Cr, Chromium (ppm) 26.2 4.3 24.2 28.1 4-Acid Digestion
Cs, Caesium (ppm) 3.41 0.203 3.31 3.52 4-Acid Digestion
Dy, Dysprosium (ppm) 1.95 0.118 1.84 2.06 4-Acid Digestion
Er, Erbium (ppm) 0.71 0.08 0.64 0.77 4-Acid Digestion
Eu, Europium (ppm) 0.80 0.12 0.68 0.93 4-Acid Digestion
Fe, Iron (wt.%) 3.67 0.120 3.62 3.72 4-Acid Digestion
Ga, Gallium (ppm) 27.2 1.90 26.3 28.1 4-Acid Digestion
Gd, Gadolinium (ppm) 3.09 0.197 2.87 3.30 4-Acid Digestion
Ge, Germanium (ppm) 0.21 0.04 0.16 0.25 4-Acid Digestion
Hf, Hafnium (ppm) 4.17 0.279 4.02 4.32 4-Acid Digestion
Ho, Holmium (ppm) 0.29 0.016 0.27 0.30 4-Acid Digestion
In, Indium (ppm) 3.61 0.186 3.52 3.70 4-Acid Digestion
K, Potassium (wt.%) 1.96 0.049 1.94 1.98 4-Acid Digestion
La, Lanthanum (ppm) 22.1 3.9 20.0 24.3 4-Acid Digestion
Li, Lithium (ppm) 22.4 1.68 21.7 23.2 4-Acid Digestion
Lu, Lutetium (ppb) 67 9 53 81 4-Acid Digestion
Mg, Magnesium (ppm) 730 61 706 754 4-Acid Digestion
Mn, Manganese (ppm) 162 11 157 167 4-Acid Digestion
Mo, Molybdenum (ppm) 10.0 0.66 9.7 10.3 4-Acid Digestion
Na, Sodium (wt.%) 1.38 0.064 1.36 1.41 4-Acid Digestion
Nb, Niobium (ppm) 11.1 0.71 10.7 11.4 4-Acid Digestion
Nd, Neodymium (ppm) 22.3 2.10 20.0 24.5 4-Acid Digestion
Ni, Nickel (ppm) 11.9 1.18 11.3 12.5 4-Acid Digestion
P, Phosphorus (ppm) 386 28 373 400 4-Acid Digestion
Pb, Lead (ppm) 862 49 841 883 4-Acid Digestion
Pr, Praseodymium (ppm) 6.06 0.73 5.27 6.85 4-Acid Digestion
Rb, Rubidium (ppm) 70 3.9 68 72 4-Acid Digestion
S, Sulphur (wt.%) 4.54 0.177 4.46 4.62 4-Acid Digestion
Sb, Antimony (ppm) 307 17 299 314 4-Acid Digestion
Sc, Scandium (ppm) 4.10 0.342 3.92 4.29 4-Acid Digestion
Se, Selenium (ppm) 41.1 3.65 39.3 42.9 4-Acid Digestion
Sm, Samarium (ppm) 4.21 0.375 3.82 4.59 4-Acid Digestion
Sn, Tin (ppm) 14.4 0.98 14.0 14.9 4-Acid Digestion
Sr, Strontium (ppm) 323 29 309 336 4-Acid Digestion
Ta, Tantalum (ppm) 0.88 0.056 0.84 0.92 4-Acid Digestion
Tb, Terbium (ppm) 0.41 0.06 0.38 0.44 4-Acid Digestion
Te, Tellurium (ppm) 36.5 3.18 35.0 38.1 4-Acid Digestion
Th, Thorium (ppm) 8.87 1.47 8.08 9.66 4-Acid Digestion
Ti, Titanium (wt.%) 0.150 0.008 0.146 0.153 4-Acid Digestion
Tl, Thallium (ppm) 5.52 0.468 5.28 5.75 4-Acid Digestion
U, Uranium (ppm) 3.82 0.288 3.67 3.97 4-Acid Digestion
V, Vanadium (ppm) 25.9 1.35 25.3 26.5 4-Acid Digestion
W, Tungsten (ppm) 12.8 0.70 12.5 13.2 4-Acid Digestion
Y, Yttrium (ppm) 8.57 0.486 8.36 8.78 4-Acid Digestion
Yb, Ytterbium (ppm) 0.51 0.08 0.41 0.61 4-Acid Digestion
Zn, Zinc (wt.%) 0.201 0.005 0.200 0.203 4-Acid Digestion
Zr, Zirconium (ppm) 146 8 143 150 4-Acid Digestion
Ag, Silver (ppm) 300 9 296 305 Aqua Regia Digestion
Al, Aluminium (wt.%) 0.758 0.042 0.738 0.778 Aqua Regia Digestion
As, Arsenic (ppm) 2411 128 2355 2468 Aqua Regia Digestion
Be, Beryllium (ppm) 0.31 0.024 0.30 0.32 Aqua Regia Digestion
Bi, Bismuth (ppm) 156 7 153 160 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.396 0.021 0.387 0.405 Aqua Regia Digestion
Cd, Cadmium (ppm) 12.4 0.79 12.0 12.8 Aqua Regia Digestion
Ce, Cerium (ppm) 27.2 1.07 26.6 27.9 Aqua Regia Digestion
Co, Cobalt (ppm) 9.05 0.402 8.85 9.24 Aqua Regia Digestion
Cr, Chromium (ppm) 26.1 2.7 24.9 27.4 Aqua Regia Digestion
Cs, Caesium (ppm) 0.79 0.030 0.78 0.81 Aqua Regia Digestion
Cu, Copper (wt.%) 0.985 0.015 0.979 0.990 Aqua Regia Digestion
Fe, Iron (wt.%) 3.47 0.177 3.39 3.55 Aqua Regia Digestion
Ga, Gallium (ppm) 6.27 0.509 5.99 6.56 Aqua Regia Digestion
Ge, Germanium (ppm) 0.19 0.05 0.15 0.24 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.90 0.085 0.85 0.95 Aqua Regia Digestion
Hg, Mercury (ppm) 1.14 0.075 1.09 1.18 Aqua Regia Digestion
In, Indium (ppm) 3.53 0.144 3.46 3.61 Aqua Regia Digestion
K, Potassium (wt.%) 0.211 0.012 0.206 0.216 Aqua Regia Digestion
La, Lanthanum (ppm) 12.9 0.87 12.5 13.3 Aqua Regia Digestion
Li, Lithium (ppm) 6.73 0.75 6.33 7.13 Aqua Regia Digestion
Mg, Magnesium (ppm) 304 13 297 312 Aqua Regia Digestion
Mn, Manganese (ppm) 142 8 139 146 Aqua Regia Digestion
Mo, Molybdenum (ppm) 9.63 0.333 9.48 9.78 Aqua Regia Digestion
Na, Sodium (wt.%) 0.053 0.007 0.050 0.057 Aqua Regia Digestion
Ni, Nickel (ppm) 11.4 0.92 10.9 11.8 Aqua Regia Digestion
P, Phosphorus (ppm) 146 10 141 151 Aqua Regia Digestion
Pb, Lead (ppm) 634 33 619 649 Aqua Regia Digestion
Rb, Rubidium (ppm) 8.58 0.849 8.08 9.09 Aqua Regia Digestion
Re, Rhenium (ppb) 4 1 4 4 Aqua Regia Digestion
S, Sulphur (wt.%) 3.50 0.166 3.42 3.58 Aqua Regia Digestion
Sb, Antimony (ppm) 259 26 248 271 Aqua Regia Digestion
Sc, Scandium (ppm) 1.00 0.11 0.95 1.06 Aqua Regia Digestion
Se, Selenium (ppm) 41.0 2.79 39.4 42.6 Aqua Regia Digestion
Sn, Tin (ppm) 12.9 0.57 12.6 13.2 Aqua Regia Digestion
Sr, Strontium (ppm) 40.5 5.1 38.1 43.0 Aqua Regia Digestion
Tb, Terbium (ppm) 0.23 0.04 0.18 0.28 Aqua Regia Digestion
Te, Tellurium (ppm) 38.5 1.48 37.8 39.3 Aqua Regia Digestion
Th, Thorium (ppm) 4.74 0.58 4.40 5.08 Aqua Regia Digestion
Ti, Titanium (ppm) 149 12 141 157 Aqua Regia Digestion
Tl, Thallium (ppm) 5.33 0.317 5.15 5.50 Aqua Regia Digestion
U, Uranium (ppm) 1.71 0.138 1.63 1.79 Aqua Regia Digestion
V, Vanadium (ppm) 8.78 0.853 8.39 9.17 Aqua Regia Digestion
W, Tungsten (ppm) 4.56 0.288 4.40 4.72 Aqua Regia Digestion
Y, Yttrium (ppm) 3.96 0.381 3.77 4.15 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.17 0.03 0.15 0.20 Aqua Regia Digestion
Zn, Zinc (wt.%) 0.199 0.007 0.196 0.202 Aqua Regia Digestion
Zr, Zirconium (ppm) 30.0 5.7 27.4 32.5 Aqua Regia Digestion
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