OREAS 601d

OREAS 601d was prepared from a blend of silver-copper-gold bearing ores from Evolution Mining’s Mount Carlton Operation in Queensland, Australia and barren rhyodacite rock sourced from a quarry east of Melbourne, Australia. A small quantity of copper-gold-silver concentrate (Mount Carlton) was added to help achieve the desired 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 argillic altered rhyodacite containing sulphur-salts.

The certification program includes:

  • Au by fire assay with AAS or ICP-OES finish;
  • Au by aqua regia digestion with AAS or ICP-MS finish;
  • Full elemental suites by 4-acid digestion with ICP-OES/MS finish, over range Cu by ore-grade digestion;
  • Full elemental suites by aqua regia digestion with ICP-OES/MS finish, over range Cu by ore-grade digestion;
  • Total S by Infrared combustion furnace;
  • Au by instrumental neutron activation analysis (INAA) on 20 x 85 mg subsamples to confirm homogeneity (ANSTO, Lucas Heights).

Indicative values for Sulphate Sulphur and Sulphide Sulphur (among others) are also available.

Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
Au, Gold (ppm) 0.817 0.028 0.804 0.831 Pb Fire Assay
Ag, Silver (ppm) 50.4 2.22 48.7 52.1 4-Acid Digestion
Cu, Copper (wt.%) 0.107 0.003 0.104 0.109 4-Acid Digestion
Au, Gold (ppm) 0.815 0.042 0.796 0.834 Aqua Regia Digestion (sample weights 10-50g)
S, Sulphur (wt.%) 0.979 0.029 0.955 1.003 Infrared Combustion
Al, Aluminium (wt.%) 7.13 0.317 6.89 7.38 4-Acid Digestion
As, Arsenic (ppm) 683 29 658 708 4-Acid Digestion
Ba, Barium (wt.%) 0.205 0.013 0.196 0.213 4-Acid Digestion
Be, Beryllium (ppm) 2.38 0.141 2.28 2.48 4-Acid Digestion
Bi, Bismuth (ppm) 23.0 1.14 22.0 24.0 4-Acid Digestion
Ca, Calcium (wt.%) 0.738 0.037 0.712 0.764 4-Acid Digestion
Cd, Cadmium (ppm) 9.70 0.444 9.34 10.07 4-Acid Digestion
Ce, Cerium (ppm) 74 5.9 70 78 4-Acid Digestion
Co, Cobalt (ppm) 4.02 0.309 3.80 4.25 4-Acid Digestion
Cr, Chromium (ppm) 18.2 2.3 16.4 19.9 4-Acid Digestion
Cs, Caesium (ppm) 5.81 0.234 5.57 6.05 4-Acid Digestion
Dy, Dysprosium (ppm) 3.10 0.226 2.82 3.38 4-Acid Digestion
Er, Erbium (ppm) 1.14 0.035 1.09 1.18 4-Acid Digestion
Eu, Europium (ppm) 1.30 0.13 1.19 1.41 4-Acid Digestion
Fe, Iron (wt.%) 2.39 0.068 2.32 2.46 4-Acid Digestion
Ga, Gallium (ppm) 20.1 0.74 19.4 20.8 4-Acid Digestion
Gd, Gadolinium (ppm) 4.93 0.226 4.68 5.18 4-Acid Digestion
Ge, Germanium (ppm) 0.16 0.06 0.11 0.20 4-Acid Digestion
Hf, Hafnium (ppm) 4.71 0.226 4.50 4.92 4-Acid Digestion
Ho, Holmium (ppm) 0.45 0.036 0.41 0.49 4-Acid Digestion
In, Indium (ppm) 0.52 0.025 0.49 0.56 4-Acid Digestion
K, Potassium (wt.%) 4.30 0.172 4.14 4.47 4-Acid Digestion
La, Lanthanum (ppm) 37.6 2.39 35.7 39.5 4-Acid Digestion
Li, Lithium (ppm) 26.8 1.17 25.7 27.8 4-Acid Digestion
Lu, Lutetium (ppm) 0.12 0.01 0.10 0.14 4-Acid Digestion
Mg, Magnesium (wt.%) 0.168 0.009 0.161 0.176 4-Acid Digestion
Mn, Manganese (wt.%) 0.025 0.001 0.024 0.026 4-Acid Digestion
Mo, Molybdenum (ppm) 7.32 0.488 6.85 7.79 4-Acid Digestion
Na, Sodium (wt.%) 1.63 0.069 1.58 1.68 4-Acid Digestion
Nb, Niobium (ppm) 14.1 0.65 13.5 14.8 4-Acid Digestion
Nd, Neodymium (ppm) 31.9 1.55 29.4 34.3 4-Acid Digestion
Ni, Nickel (ppm) 7.22 0.531 6.75 7.68 4-Acid Digestion
P, Phosphorus (wt.%) 0.039 0.002 0.037 0.040 4-Acid Digestion
Pb, Lead (ppm) 986 37 958 1015 4-Acid Digestion
Pr, Praseodymium (ppm) 8.52 0.541 7.77 9.27 4-Acid Digestion
Rb, Rubidium (ppm) 201 10 195 207 4-Acid Digestion
Re, Rhenium (ppm) < 0.002 IND IND IND 4-Acid Digestion
S, Sulphur (wt.%) 0.991 0.035 0.963 1.019 4-Acid Digestion
Sb, Antimony (ppm) 40.7 1.60 39.0 42.4 4-Acid Digestion
Sc, Scandium (ppm) 4.88 0.424 4.59 5.18 4-Acid Digestion
Se, Selenium (ppm) 4.05 0.41 3.40 4.71 4-Acid Digestion
Sm, Samarium (ppm) 6.13 0.251 5.78 6.49 4-Acid Digestion
Sn, Tin (ppm) 4.86 0.252 4.63 5.08 4-Acid Digestion
Sr, Strontium (ppm) 224 12 215 233 4-Acid Digestion
Ta, Tantalum (ppm) 1.06 0.086 0.98 1.15 4-Acid Digestion
Tb, Terbium (ppm) 0.62 0.06 0.56 0.67 4-Acid Digestion
Te, Tellurium (ppm) 4.58 0.321 4.26 4.91 4-Acid Digestion
Th, Thorium (ppm) 12.3 0.84 11.7 13.0 4-Acid Digestion
Ti, Titanium (wt.%) 0.181 0.006 0.175 0.186 4-Acid Digestion
Tl, Thallium (ppm) 3.96 0.223 3.80 4.13 4-Acid Digestion
Tm, Thulium (ppm) 0.15 0.02 0.12 0.17 4-Acid Digestion
U, Uranium (ppm) 4.24 0.148 4.07 4.40 4-Acid Digestion
V, Vanadium (ppm) 23.5 0.99 22.4 24.6 4-Acid Digestion
W, Tungsten (ppm) 2.77 0.206 2.60 2.94 4-Acid Digestion
Y, Yttrium (ppm) 13.4 0.78 12.7 14.1 4-Acid Digestion
Yb, Ytterbium (ppm) 0.90 0.073 0.81 1.00 4-Acid Digestion
Zn, Zinc (ppm) 973 33 946 999 4-Acid Digestion
Zr, Zirconium (ppm) 164 7 158 169 4-Acid Digestion
Ag, Silver (ppm) 50.0 1.75 48.7 51.4 Aqua Regia Digestion
Al, Aluminium (wt.%) 0.633 0.048 0.607 0.660 Aqua Regia Digestion
As, Arsenic (ppm) 678 23 662 695 Aqua Regia Digestion
B, Boron (ppm) < 10.0 IND IND IND Aqua Regia Digestion
Ba, Barium (ppm) 193 24 179 207 Aqua Regia Digestion
Be, Beryllium (ppm) 0.58 0.036 0.55 0.60 Aqua Regia Digestion
Bi, Bismuth (ppm) 23.6 1.13 22.7 24.6 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.575 0.025 0.559 0.590 Aqua Regia Digestion
Cd, Cadmium (ppm) 9.59 0.595 9.21 9.98 Aqua Regia Digestion
Ce, Cerium (ppm) 38.3 5.0 35.8 40.9 Aqua Regia Digestion
Co, Cobalt (ppm) 3.60 0.300 3.41 3.80 Aqua Regia Digestion
Cr, Chromium (ppm) 17.0 0.97 15.9 18.0 Aqua Regia Digestion
Cs, Caesium (ppm) 1.48 0.102 1.41 1.55 Aqua Regia Digestion
Cu, Copper (wt.%) 0.107 0.003 0.105 0.110 Aqua Regia Digestion
Dy, Dysprosium (ppm) 1.51 0.22 1.31 1.70 Aqua Regia Digestion
Er, Erbium (ppm) 0.48 0.05 0.42 0.53 Aqua Regia Digestion
Eu, Europium (ppm) 0.55 0.11 0.42 0.68 Aqua Regia Digestion
Fe, Iron (wt.%) 1.92 0.092 1.87 1.97 Aqua Regia Digestion
Ga, Gallium (ppm) 3.17 0.39 2.94 3.39 Aqua Regia Digestion
Gd, Gadolinium (ppm) 2.55 0.37 2.22 2.89 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.88 0.087 0.83 0.94 Aqua Regia Digestion
Hg, Mercury (ppm) 0.16 0.014 0.14 0.18 Aqua Regia Digestion
Ho, Holmium (ppm) 0.22 0.02 0.19 0.25 Aqua Regia Digestion
In, Indium (ppm) 0.46 0.026 0.43 0.49 Aqua Regia Digestion
K, Potassium (wt.%) 0.352 0.024 0.337 0.367 Aqua Regia Digestion
La, Lanthanum (ppm) 19.1 2.6 17.7 20.5 Aqua Regia Digestion
Li, Lithium (ppm) 6.07 0.72 5.70 6.44 Aqua Regia Digestion
Lu, Lutetium (ppm) 0.044 0.006 0.037 0.051 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.086 0.005 0.082 0.089 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.020 0.001 0.020 0.021 Aqua Regia Digestion
Mo, Molybdenum (ppm) 6.72 0.451 6.39 7.05 Aqua Regia Digestion
Na, Sodium (wt.%) 0.046 0.006 0.043 0.048 Aqua Regia Digestion
Nd, Neodymium (ppm) 16.3 3.2 13.0 19.5 Aqua Regia Digestion
Ni, Nickel (ppm) 6.91 0.428 6.48 7.34 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.027 0.002 0.026 0.028 Aqua Regia Digestion
Pb, Lead (ppm) 930 30 904 956 Aqua Regia Digestion
Rb, Rubidium (ppm) 17.6 2.1 16.5 18.8 Aqua Regia Digestion
Re, Rhenium (ppm) 0.001 0.001 0.000 0.002 Aqua Regia Digestion
S, Sulphur (wt.%) 0.848 0.036 0.823 0.872 Aqua Regia Digestion
Sb, Antimony (ppm) 32.2 3.5 30.3 34.2 Aqua Regia Digestion
Sc, Scandium (ppm) 1.22 0.18 1.09 1.35 Aqua Regia Digestion
Se, Selenium (ppm) 3.70 0.283 3.38 4.01 Aqua Regia Digestion
Sm, Samarium (ppm) 3.13 0.45 2.72 3.55 Aqua Regia Digestion
Sn, Tin (ppm) 2.27 0.167 2.14 2.40 Aqua Regia Digestion
Sr, Strontium (ppm) 40.0 4.9 37.4 42.7 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.010 IND IND IND Aqua Regia Digestion
Tb, Terbium (ppm) 0.33 0.04 0.29 0.36 Aqua Regia Digestion
Te, Tellurium (ppm) 4.49 0.281 4.25 4.72 Aqua Regia Digestion
Th, Thorium (ppm) 6.34 0.73 5.94 6.75 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.011 0.002 0.010 0.012 Aqua Regia Digestion
Tl, Thallium (ppm) 1.10 0.051 1.06 1.14 Aqua Regia Digestion
U, Uranium (ppm) 1.90 0.166 1.80 2.01 Aqua Regia Digestion
V, Vanadium (ppm) 6.46 0.80 5.92 7.01 Aqua Regia Digestion
W, Tungsten (ppm) 0.92 0.18 0.81 1.02 Aqua Regia Digestion
Y, Yttrium (ppm) 5.88 0.456 5.56 6.20 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.34 0.05 0.30 0.37 Aqua Regia Digestion
Zn, Zinc (ppm) 940 36 917 964 Aqua Regia Digestion
Zr, Zirconium (ppm) 32.8 2.76 31.2 34.5 Aqua Regia Digestion
S-(Sulphate), Sulphur as SO4.2- (wt.%) 0.294 0.091 0.246 0.342 Alkaline Leach
S-(Sulphide), Sulphur as S2- (wt.%) 0.641 0.134 0.564 0.718 Alkaline Leach
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