OREAS 262b

OREAS 262b was prepared from a blend of gold-bearing oxide ores (from Australia and Laos) and barren mudstone sourced from a quarry east of Melbourne, Australia. The main ore proportion was sourced from intrusion-related, low-grade gold-copper oxide ore from the southern Archaean Yilgarn Craton of Western Australia. The lesser ore proportion consists of gold-copper oxide ore from the Sepon Mineral District. Gold mineralisation is often localised in structural and stratigraphic fluid traps similar in style to the sediment-hosted gold deposits of the Carlin Trend, Nevada, USA. Thirty-three commercial analytical laboratories participated in the program to certify:

  • Gold by fire assay;
  • Gold by 15-50g aqua regia digestion;
  • Gold by 5-200g cyanide leach;
  • Gold by PhotonAssay;
  • Full ICP-OES and ICP-MS elemental suites by 4-acid digestion;
  • Full ICP-OES and ICP-MS elemental suites by aqua regia digestion.
Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
Au, Gold (ppb) 104 6.0 101 107 Pb Fire Assay
Au, Gold (ppb) 93.5 13.55 86.8 100.3 Aqua Regia Digestion (sample weights 10-50g)
Au, Gold (ppb) 82.1 14.53 74.6 89.6 Cyanide Leach
Au, Gold (ppb) 108 23.4 102 114 PhotonAssay
Ag, Silver (ppm) 0.158 0.019 0.125 0.190 4-Acid Digestion
Al, Aluminium (wt.%) 5.01 0.214 4.85 5.17 4-Acid Digestion
As, Arsenic (ppm) 30.3 2.95 28.0 32.5 4-Acid Digestion
Ba, Barium (ppm) 336 11 325 347 4-Acid Digestion
Be, Beryllium (ppm) 1.52 0.033 1.46 1.57 4-Acid Digestion
Bi, Bismuth (ppm) 0.73 0.051 0.68 0.79 4-Acid Digestion
Ca, Calcium (wt.%) 0.384 0.014 0.369 0.398 4-Acid Digestion
Cd, Cadmium (ppm) 0.062 0.017 0.043 0.080 4-Acid Digestion
Ce, Cerium (ppm) 68 2.6 65 71 4-Acid Digestion
Co, Cobalt (ppm) 5.74 0.349 5.41 6.06 4-Acid Digestion
Cr, Chromium (ppm) 49.7 5.0 46.3 53.0 4-Acid Digestion
Cs, Caesium (ppm) 5.02 0.169 4.79 5.25 4-Acid Digestion
Cu, Copper (ppm) 70 3.5 67 73 4-Acid Digestion
Dy, Dysprosium (ppm) 2.37 0.39 1.94 2.80 4-Acid Digestion
Er, Erbium (ppm) 1.31 0.128 1.14 1.47 4-Acid Digestion
Eu, Europium (ppm) 0.74 0.028 0.68 0.79 4-Acid Digestion
Fe, Iron (wt.%) 2.46 0.049 2.39 2.53 4-Acid Digestion
Ga, Gallium (ppm) 12.6 0.72 11.9 13.3 4-Acid Digestion
Gd, Gadolinium (ppm) 3.35 0.255 2.92 3.79 4-Acid Digestion
Hf, Hafnium (ppm) 2.54 0.238 2.32 2.75 4-Acid Digestion
Ho, Holmium (ppm) 0.43 0.05 0.37 0.49 4-Acid Digestion
In, Indium (ppm) 0.063 0.006 0.056 0.071 4-Acid Digestion
K, Potassium (wt.%) 1.63 0.082 1.57 1.70 4-Acid Digestion
La, Lanthanum (ppm) 34.6 1.22 32.8 36.3 4-Acid Digestion
Li, Lithium (ppm) 34.9 1.27 33.6 36.1 4-Acid Digestion
Lu, Lutetium (ppm) 0.19 0.02 0.15 0.23 4-Acid Digestion
Mg, Magnesium (wt.%) 0.557 0.014 0.537 0.576 4-Acid Digestion
Mn, Manganese (wt.%) 0.019 0.001 0.018 0.019 4-Acid Digestion
Mo, Molybdenum (ppm) 1.48 0.121 1.28 1.68 4-Acid Digestion
Na, Sodium (wt.%) 0.190 0.011 0.181 0.198 4-Acid Digestion
Nb, Niobium (ppm) 7.70 1.30 6.86 8.54 4-Acid Digestion
Nd, Neodymium (ppm) 24.0 4.4 18.9 29.0 4-Acid Digestion
Ni, Nickel (ppm) 22.0 1.66 20.4 23.7 4-Acid Digestion
P, Phosphorus (wt.%) 0.024 0.001 0.022 0.025 4-Acid Digestion
Pb, Lead (ppm) 19.4 0.73 18.5 20.2 4-Acid Digestion
Pr, Praseodymium (ppm) 6.97 0.72 6.13 7.81 4-Acid Digestion
Rb, Rubidium (ppm) 110 6 105 116 4-Acid Digestion
Re, Rhenium (ppm) < 0.002 IND IND IND 4-Acid Digestion
S, Sulphur (wt.%) 0.036 0.006 0.033 0.040 4-Acid Digestion
Sb, Antimony (ppm) 5.41 0.334 5.09 5.73 4-Acid Digestion
Sc, Scandium (ppm) 7.02 0.447 6.59 7.44 4-Acid Digestion
Sm, Samarium (ppm) 4.35 0.348 3.88 4.82 4-Acid Digestion
Sn, Tin (ppm) 6.72 0.292 6.40 7.05 4-Acid Digestion
Sr, Strontium (ppm) 44.1 1.67 41.9 46.3 4-Acid Digestion
Ta, Tantalum (ppm) 0.78 0.12 0.68 0.88 4-Acid Digestion
Tb, Terbium (ppm) 0.45 0.037 0.39 0.51 4-Acid Digestion
Te, Tellurium (ppm) 0.11 0.02 0.08 0.14 4-Acid Digestion
Th, Thorium (ppm) 12.6 0.64 11.9 13.3 4-Acid Digestion
Ti, Titanium (wt.%) 0.253 0.019 0.238 0.267 4-Acid Digestion
Tl, Thallium (ppm) 0.88 0.047 0.83 0.93 4-Acid Digestion
Tm, Thulium (ppm) 0.18 0.017 0.16 0.20 4-Acid Digestion
U, Uranium (ppm) 1.95 0.097 1.83 2.07 4-Acid Digestion
V, Vanadium (ppm) 51 2.7 49 54 4-Acid Digestion
W, Tungsten (ppm) 3.07 0.284 2.80 3.34 4-Acid Digestion
Y, Yttrium (ppm) 12.0 0.95 11.1 12.9 4-Acid Digestion
Yb, Ytterbium (ppm) 1.30 0.19 1.11 1.48 4-Acid Digestion
Zn, Zinc (ppm) 47.2 2.28 45.1 49.2 4-Acid Digestion
Zr, Zirconium (ppm) 89 7.0 83 95 4-Acid Digestion
Ag, Silver (ppm) 0.132 0.008 0.118 0.147 Aqua Regia Digestion
Al, Aluminium (wt.%) 0.922 0.170 0.821 1.024 Aqua Regia Digestion
As, Arsenic (ppm) 13.9 0.76 13.0 14.8 Aqua Regia Digestion
B, Boron (ppm) < 10.0 IND IND IND Aqua Regia Digestion
Ba, Barium (ppm) 75 4.1 69 80 Aqua Regia Digestion
Be, Beryllium (ppm) 0.47 0.05 0.43 0.51 Aqua Regia Digestion
Bi, Bismuth (ppm) 0.69 0.043 0.64 0.73 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.266 0.011 0.256 0.276 Aqua Regia Digestion
Cd, Cadmium (ppm) 0.063 0.010 0.049 0.077 Aqua Regia Digestion
Ce, Cerium (ppm) 31.3 2.04 29.4 33.2 Aqua Regia Digestion
Co, Cobalt (ppm) 4.02 0.43 3.71 4.34 Aqua Regia Digestion
Cr, Chromium (ppm) 31.8 1.43 29.9 33.7 Aqua Regia Digestion
Cs, Caesium (ppm) 1.65 0.27 1.47 1.83 Aqua Regia Digestion
Cu, Copper (ppm) 66 2.4 64 69 Aqua Regia Digestion
Fe, Iron (wt.%) 2.07 0.122 1.99 2.14 Aqua Regia Digestion
Ga, Gallium (ppm) 2.93 0.53 2.53 3.33 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.33 0.031 0.29 0.37 Aqua Regia Digestion
Hg, Mercury (ppm) 0.056 0.013 0.043 0.069 Aqua Regia Digestion
In, Indium (ppm) 0.019 0.002 0.016 0.023 Aqua Regia Digestion
K, Potassium (wt.%) 0.216 0.028 0.199 0.234 Aqua Regia Digestion
La, Lanthanum (ppm) 14.5 1.13 13.7 15.3 Aqua Regia Digestion
Li, Lithium (ppm) 11.3 1.7 10.2 12.4 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.287 0.047 0.260 0.313 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.014 0.001 0.014 0.015 Aqua Regia Digestion
Mo, Molybdenum (ppm) 1.39 0.15 1.24 1.53 Aqua Regia Digestion
Ni, Nickel (ppm) 16.0 1.15 14.7 17.3 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.019 0.001 0.018 0.020 Aqua Regia Digestion
Pb, Lead (ppm) 16.6 0.95 15.8 17.5 Aqua Regia Digestion
Rb, Rubidium (ppm) 17.0 1.07 15.9 18.0 Aqua Regia Digestion
Re, Rhenium (ppm) < 0.001 IND IND IND Aqua Regia Digestion
S, Sulphur (wt.%) 0.031 0.001 0.030 0.032 Aqua Regia Digestion
Sb, Antimony (ppm) 3.55 0.48 3.24 3.86 Aqua Regia Digestion
Sc, Scandium (ppm) 1.55 0.113 1.40 1.70 Aqua Regia Digestion
Sn, Tin (ppm) 1.66 0.22 1.50 1.83 Aqua Regia Digestion
Sr, Strontium (ppm) 12.0 0.72 11.3 12.8 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.010 IND IND IND Aqua Regia Digestion
Tb, Terbium (ppm) 0.26 0.03 0.22 0.30 Aqua Regia Digestion
Te, Tellurium (ppm) 0.090 0.017 0.068 0.111 Aqua Regia Digestion
Th, Thorium (ppm) 8.89 0.583 8.34 9.44 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.017 0.003 0.015 0.019 Aqua Regia Digestion
Tl, Thallium (ppm) 0.28 0.022 0.26 0.30 Aqua Regia Digestion
U, Uranium (ppm) 1.13 0.087 1.06 1.19 Aqua Regia Digestion
V, Vanadium (ppm) 19.3 1.04 18.3 20.3 Aqua Regia Digestion
W, Tungsten (ppm) 0.64 0.12 0.53 0.76 Aqua Regia Digestion
Y, Yttrium (ppm) 5.06 0.416 4.75 5.37 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.44 0.05 0.34 0.53 Aqua Regia Digestion
Zn, Zinc (ppm) 28.5 3.5 26.4 30.6 Aqua Regia Digestion
Zr, Zirconium (ppm) 13.4 2.0 11.9 14.9 Aqua Regia Digestion
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