OREAS 607c

OREAS 607c was prepared from a blend of gold-copper-silver ores from Evolution Mining’s Mount Carlton Operation in Queensland, Australia and barren argillic rhyodacite sourced from a quarry east of Melbourne, Australia. A minor quantity of Cu-Au-Ag concentrate was also added to help achieve target 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-eight commercial analytical laboratories participated in the program to certify the following:

  • Gold by fire assay using a 25-50 g charge weight with AAS (12 laboratories), ICP-OES (10 laboratories) or ICP-MS (1 laboratory) finish;
  • Gold by aqua regia digestion using a 10-50 g sample mass with ICP-OES/MS (15 laboratories) or AAS (5 laboratories) finish;
  • Full ICP-OES and MS elemental suites by 4-acid digestion (up to 26 laboratories depending on the element);
  • Full ICP-OES and MS elemental suites by aqua regia digestion (up to 26 laboratories depending on the element).

To evaluate homogeneity, instrumental neutron activation analysis (INAA) of Au on 20 x 1 g subsamples was undertaken at Actlabs Ancaster in Canada.

Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
Au, Gold (ppm) 0.755 0.013 0.749 0.761 Pb Fire Assay
Ag, Silver (ppm) 6.33 0.267 6.03 6.63 4-Acid Digestion
Cu, Copper (wt.%) 0.057 0.002 0.055 0.058 4-Acid Digestion
Au, Gold (ppm) 0.751 0.031 0.737 0.766 Aqua Regia Digestion (sample weights 10-50g)
S, Sulphur (wt.%) 0.666 0.028 0.640 0.693 Infrared Combustion
C, Carbon (wt.%) 0.281 0.014 0.257 0.305 Infrared Combustion
Al, Aluminium (wt.%) 7.30 0.277 7.03 7.56 4-Acid Digestion
As, Arsenic (ppm) 135 7 130 140 4-Acid Digestion
Ba, Barium (ppm) 2629 179 2504 2755 4-Acid Digestion
Be, Beryllium (ppm) 2.79 0.121 2.63 2.94 4-Acid Digestion
Bi, Bismuth (ppm) 7.02 0.418 6.73 7.32 4-Acid Digestion
Ca, Calcium (wt.%) 1.13 0.050 1.08 1.18 4-Acid Digestion
Cd, Cadmium (ppm) 1.81 0.121 1.70 1.92 4-Acid Digestion
Ce, Cerium (ppm) 85 4.6 80 90 4-Acid Digestion
Co, Cobalt (ppm) 2.54 0.214 2.35 2.72 4-Acid Digestion
Cr, Chromium (ppm) 12.4 1.3 10.7 14.0 4-Acid Digestion
Cs, Caesium (ppm) 6.32 0.230 6.02 6.62 4-Acid Digestion
Dy, Dysprosium (ppm) 3.20 0.155 2.98 3.43 4-Acid Digestion
Er, Erbium (ppm) 0.92 0.062 0.83 1.02 4-Acid Digestion
Eu, Europium (ppm) 1.26 0.13 1.10 1.42 4-Acid Digestion
Fe, Iron (wt.%) 2.24 0.057 2.17 2.31 4-Acid Digestion
Ga, Gallium (ppm) 22.7 0.97 21.8 23.7 4-Acid Digestion
Gd, Gadolinium (ppm) 5.45 0.430 4.98 5.92 4-Acid Digestion
Ge, Germanium (ppm) 0.16 0.04 0.12 0.20 4-Acid Digestion
Hf, Hafnium (ppm) 5.96 0.222 5.67 6.26 4-Acid Digestion
Ho, Holmium (ppm) 0.45 0.016 0.41 0.49 4-Acid Digestion
In, Indium (ppm) 0.21 0.011 0.19 0.22 4-Acid Digestion
K, Potassium (wt.%) 3.00 0.090 2.91 3.10 4-Acid Digestion
La, Lanthanum (ppm) 42.5 2.77 39.9 45.0 4-Acid Digestion
Li, Lithium (ppm) 27.9 1.54 26.6 29.2 4-Acid Digestion
Lu, Lutetium (ppm) 0.074 0.005 0.063 0.084 4-Acid Digestion
Mg, Magnesium (wt.%) 0.163 0.009 0.155 0.172 4-Acid Digestion
Mn, Manganese (wt.%) 0.027 0.001 0.026 0.027 4-Acid Digestion
Mo, Molybdenum (ppm) 3.47 0.252 3.20 3.75 4-Acid Digestion
Na, Sodium (wt.%) 2.29 0.082 2.21 2.36 4-Acid Digestion
Nb, Niobium (ppm) 16.7 1.39 15.5 17.8 4-Acid Digestion
Nd, Neodymium (ppm) 35.4 2.61 32.2 38.6 4-Acid Digestion
Ni, Nickel (ppm) 4.24 0.307 3.94 4.54 4-Acid Digestion
P, Phosphorus (wt.%) 0.035 0.001 0.034 0.037 4-Acid Digestion
Pb, Lead (ppm) 223 10 215 232 4-Acid Digestion
Pr, Praseodymium (ppm) 9.60 0.760 8.71 10.49 4-Acid Digestion
Rb, Rubidium (ppm) 135 9 128 142 4-Acid Digestion
Re, Rhenium (ppm) < 0.002 IND IND IND 4-Acid Digestion
S, Sulphur (wt.%) 0.684 0.030 0.663 0.705 4-Acid Digestion
Sb, Antimony (ppm) 21.8 0.93 20.7 22.9 4-Acid Digestion
Sc, Scandium (ppm) 4.17 0.48 3.81 4.53 4-Acid Digestion
Sm, Samarium (ppm) 6.69 0.504 6.12 7.27 4-Acid Digestion
Sn, Tin (ppm) 3.83 0.212 3.61 4.06 4-Acid Digestion
Sr, Strontium (ppm) 198 11 189 207 4-Acid Digestion
Ta, Tantalum (ppm) 1.25 0.067 1.18 1.32 4-Acid Digestion
Tb, Terbium (ppm) 0.70 0.020 0.66 0.75 4-Acid Digestion
Te, Tellurium (ppm) 1.18 0.116 1.07 1.29 4-Acid Digestion
Th, Thorium (ppm) 14.1 0.89 13.3 14.9 4-Acid Digestion
Ti, Titanium (wt.%) 0.120 0.005 0.116 0.124 4-Acid Digestion
Tl, Thallium (ppm) 0.94 0.033 0.90 0.98 4-Acid Digestion
Tm, Thulium (ppm) 0.10 0.005 0.09 0.11 4-Acid Digestion
U, Uranium (ppm) 4.90 0.342 4.64 5.16 4-Acid Digestion
V, Vanadium (ppm) 9.19 0.842 8.40 9.98 4-Acid Digestion
W, Tungsten (ppm) 2.32 0.158 2.14 2.49 4-Acid Digestion
Y, Yttrium (ppm) 13.6 0.80 12.9 14.2 4-Acid Digestion
Yb, Ytterbium (ppm) 0.54 0.046 0.47 0.61 4-Acid Digestion
Zn, Zinc (ppm) 428 20 412 445 4-Acid Digestion
Zr, Zirconium (ppm) 216 9 209 223 4-Acid Digestion
Ag, Silver (ppm) 6.31 0.336 6.07 6.55 Aqua Regia Digestion
Al, Aluminium (wt.%) 0.626 0.059 0.588 0.663 Aqua Regia Digestion
As, Arsenic (ppm) 129 7 123 134 Aqua Regia Digestion
B, Boron (ppm) < 10.0 IND IND IND Aqua Regia Digestion
Ba, Barium (ppm) 274 19 260 288 Aqua Regia Digestion
Be, Beryllium (ppm) 0.68 0.07 0.62 0.74 Aqua Regia Digestion
Bi, Bismuth (ppm) 7.33 0.365 7.01 7.65 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.936 0.040 0.910 0.962 Aqua Regia Digestion
Cd, Cadmium (ppm) 1.80 0.084 1.70 1.90 Aqua Regia Digestion
Ce, Cerium (ppm) 44.3 3.18 41.6 46.9 Aqua Regia Digestion
Co, Cobalt (ppm) 1.81 0.159 1.67 1.94 Aqua Regia Digestion
Cr, Chromium (ppm) 12.9 0.83 12.0 13.8 Aqua Regia Digestion
Cs, Caesium (ppm) 1.35 0.14 1.24 1.46 Aqua Regia Digestion
Cu, Copper (wt.%) 0.056 0.003 0.055 0.058 Aqua Regia Digestion
Fe, Iron (wt.%) 1.59 0.091 1.54 1.64 Aqua Regia Digestion
Ga, Gallium (ppm) 3.21 0.41 2.95 3.47 Aqua Regia Digestion
Hf, Hafnium (ppm) 1.08 0.093 1.00 1.16 Aqua Regia Digestion
Hg, Mercury (ppm) 0.082 0.010 0.063 0.100 Aqua Regia Digestion
In, Indium (ppm) 0.15 0.008 0.14 0.16 Aqua Regia Digestion
K, Potassium (wt.%) 0.270 0.020 0.255 0.284 Aqua Regia Digestion
La, Lanthanum (ppm) 21.9 1.55 20.7 23.2 Aqua Regia Digestion
Li, Lithium (ppm) 7.29 0.622 6.79 7.79 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.071 0.006 0.068 0.074 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.024 0.001 0.024 0.025 Aqua Regia Digestion
Mo, Molybdenum (ppm) 3.15 0.201 2.90 3.39 Aqua Regia Digestion
Na, Sodium (wt.%) 0.064 0.008 0.057 0.071 Aqua Regia Digestion
Nb, Niobium (ppm) 0.34 0.08 0.27 0.41 Aqua Regia Digestion
Ni, Nickel (ppm) 3.90 0.265 3.64 4.16 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.025 0.002 0.024 0.026 Aqua Regia Digestion
Pb, Lead (ppm) 187 7 181 192 Aqua Regia Digestion
Rb, Rubidium (ppm) 14.1 1.5 13.0 15.2 Aqua Regia Digestion
Re, Rhenium (ppm) < 0.001 IND IND IND Aqua Regia Digestion
S, Sulphur (wt.%) 0.369 0.025 0.353 0.384 Aqua Regia Digestion
Sb, Antimony (ppm) 16.8 1.7 15.8 17.8 Aqua Regia Digestion
Sc, Scandium (ppm) 1.09 0.15 0.97 1.20 Aqua Regia Digestion
Se, Selenium (ppm) 1.76 0.20 1.50 2.01 Aqua Regia Digestion
Sn, Tin (ppm) 0.95 0.18 0.83 1.08 Aqua Regia Digestion
Sr, Strontium (ppm) 31.6 1.32 30.1 33.1 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.010 IND IND IND Aqua Regia Digestion
Tb, Terbium (ppm) 0.37 0.026 0.33 0.40 Aqua Regia Digestion
Te, Tellurium (ppm) 1.12 0.092 1.02 1.22 Aqua Regia Digestion
Th, Thorium (ppm) 7.08 0.645 6.65 7.50 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.015 0.003 0.013 0.016 Aqua Regia Digestion
Tl, Thallium (ppm) 0.29 0.015 0.27 0.31 Aqua Regia Digestion
U, Uranium (ppm) 2.32 0.25 2.17 2.48 Aqua Regia Digestion
V, Vanadium (ppm) 3.00 0.143 2.86 3.14 Aqua Regia Digestion
W, Tungsten (ppm) 0.53 0.043 0.48 0.58 Aqua Regia Digestion
Y, Yttrium (ppm) 6.06 0.484 5.72 6.40 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.20 0.005 0.19 0.21 Aqua Regia Digestion
Zn, Zinc (ppm) 366 17 353 379 Aqua Regia Digestion
Zr, Zirconium (ppm) 41.9 5.7 38.5 45.2 Aqua Regia Digestion
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