OREAS 268

OREAS 268 was prepared from a blend of high-grade oxide gold ore and barren materials (basaltic scoria and oxidised siliciclastic sediments). The scoria and sediments were sourced from quarries located in New South Wales and Victoria in Australia. The gold ore was sourced from the Agate Creek Gold Project located in the Etheridge Goldfield of northern Queensland, Australia. The project is hosted within a metamorphosed turbidite sequence of interbedded sandstones, siltstones and shales. Epithermal and mesothermal gold mineralisation occurs within quartz veining, stockworks and breccias associated with Permian felsic volcanic units and Proterozoic batholith. Thirty-one commercial analytical laboratories participated in the program to certify the elements reported below.

  • Gold by fire assay (25-50g charge weight) with AAS and ICP-OES finish;
  • Gold by aqua regia digestion (15-50g sample weight) with ICP-OES and/or ICP-MS finish;
  • Gold by cyanide leach (20-200g) with AAS or ICP-MS finish;
  • Gold by x-ray photon assay on ~350g sample weights (12 Chrysos PhotonAssay units at 7 laboratories with two rounds of data reported from each unit);
  • Full ICP-OES and ICP-MS elemental suites by 4-acid digestion;
  • Full ICP-OES and ICP-MS elemental suites by aqua regia digestion.

To confirm homogeneity, gold by instrumental neutron activation analysis (INAA) was undertaken on 20 x 85mg subsamples (see Table 6 in the ‘Homogeneity Evaluation’ section of the Certificate).

Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
Au, Gold (ppm) 11.42 0.332 11.28 11.56 Pb Fire Assay
Au, Gold (ppm) 11.67 0.214 11.58 11.76 PhotonAssay
Au, Gold (ppm) 11.29 0.519 11.07 11.51 Aqua Regia Digestion (sample weights 10-50g)
Au, Gold (ppm) 11.17 0.277 11.05 11.29 Cyanide Leach
Ag, Silver (ppm) 4.86 0.211 4.62 5.09 4-Acid Digestion
Al, Aluminium (wt.%) 5.18 0.162 5.05 5.31 4-Acid Digestion
As, Arsenic (ppm) 134 4 130 139 4-Acid Digestion
Ba, Barium (ppm) 385 12 374 397 4-Acid Digestion
Be, Beryllium (ppm) 1.92 0.135 1.77 2.07 4-Acid Digestion
Bi, Bismuth (ppm) 5.31 0.385 4.86 5.75 4-Acid Digestion
Ca, Calcium (wt.%) 1.18 0.046 1.14 1.22 4-Acid Digestion
Cd, Cadmium (ppm) 0.041 0.014 0.025 0.056 4-Acid Digestion
Ce, Cerium (ppm) 61 2.6 59 64 4-Acid Digestion
Co, Cobalt (ppm) 11.1 0.43 10.5 11.7 4-Acid Digestion
Cr, Chromium (ppm) 94 7.9 87 100 4-Acid Digestion
Cs, Caesium (ppm) 6.05 0.270 5.79 6.32 4-Acid Digestion
Cu, Copper (ppm) 27.1 1.22 25.7 28.5 4-Acid Digestion
Dy, Dysprosium (ppm) 3.14 0.147 2.95 3.34 4-Acid Digestion
Er, Erbium (ppm) 1.52 0.129 1.39 1.65 4-Acid Digestion
Eu, Europium (ppm) 1.03 0.074 0.94 1.12 4-Acid Digestion
Fe, Iron (wt.%) 2.95 0.088 2.86 3.05 4-Acid Digestion
Ga, Gallium (ppm) 15.0 0.62 14.3 15.6 4-Acid Digestion
Gd, Gadolinium (ppm) 4.15 0.156 3.82 4.48 4-Acid Digestion
Ge, Germanium (ppm) 0.15 0.05 0.10 0.21 4-Acid Digestion
Hf, Hafnium (ppm) 3.11 0.141 2.93 3.29 4-Acid Digestion
Ho, Holmium (ppm) 0.56 0.040 0.48 0.63 4-Acid Digestion
In, Indium (ppm) 0.063 0.005 0.054 0.072 4-Acid Digestion
K, Potassium (wt.%) 1.30 0.057 1.26 1.34 4-Acid Digestion
La, Lanthanum (ppm) 31.3 1.50 29.8 32.8 4-Acid Digestion
Li, Lithium (ppm) 56 3.1 54 59 4-Acid Digestion
Lu, Lutetium (ppm) 0.21 0.016 0.19 0.24 4-Acid Digestion
Mg, Magnesium (wt.%) 0.990 0.052 0.958 1.022 4-Acid Digestion
Mn, Manganese (wt.%) 0.028 0.001 0.027 0.029 4-Acid Digestion
Mo, Molybdenum (ppm) 7.19 0.436 6.74 7.65 4-Acid Digestion
Na, Sodium (wt.%) 0.543 0.020 0.524 0.562 4-Acid Digestion
Nb, Niobium (ppm) 15.2 1.14 14.2 16.2 4-Acid Digestion
Nd, Neodymium (ppm) 27.0 0.84 25.5 28.4 4-Acid Digestion
Ni, Nickel (ppm) 50 2.3 48 52 4-Acid Digestion
P, Phosphorus (wt.%) 0.053 0.002 0.052 0.055 4-Acid Digestion
Pb, Lead (ppm) 15.5 1.12 14.4 16.6 4-Acid Digestion
Pr, Praseodymium (ppm) 7.22 0.229 6.85 7.60 4-Acid Digestion
Rb, Rubidium (ppm) 77 3.3 74 80 4-Acid Digestion
Re, Rhenium (ppm) < 0.002 IND IND IND 4-Acid Digestion
S, Sulphur (wt.%) 0.028 0.004 0.022 0.034 4-Acid Digestion
Sb, Antimony (ppm) 4.83 0.244 4.61 5.06 4-Acid Digestion
Sc, Scandium (ppm) 9.23 0.467 8.76 9.70 4-Acid Digestion
Se, Selenium (ppm) 0.95 0.21 0.61 1.28 4-Acid Digestion
Sm, Samarium (ppm) 5.12 0.148 4.82 5.41 4-Acid Digestion
Sn, Tin (ppm) 6.51 0.409 6.09 6.93 4-Acid Digestion
Sr, Strontium (ppm) 170 4 166 175 4-Acid Digestion
Ta, Tantalum (ppm) 1.04 0.092 0.95 1.12 4-Acid Digestion
Tb, Terbium (ppm) 0.54 0.036 0.51 0.57 4-Acid Digestion
Te, Tellurium (ppm) 0.12 0.03 0.07 0.18 4-Acid Digestion
Th, Thorium (ppm) 9.36 0.489 8.88 9.84 4-Acid Digestion
Ti, Titanium (wt.%) 0.393 0.017 0.376 0.410 4-Acid Digestion
Tl, Thallium (ppm) 0.46 0.028 0.44 0.48 4-Acid Digestion
Tm, Thulium (ppm) 0.20 0.010 0.19 0.21 4-Acid Digestion
U, Uranium (ppm) 1.82 0.086 1.72 1.93 4-Acid Digestion
V, Vanadium (ppm) 69 2.2 66 72 4-Acid Digestion
W, Tungsten (ppm) 25.2 1.26 23.4 27.0 4-Acid Digestion
Y, Yttrium (ppm) 13.7 0.91 12.9 14.5 4-Acid Digestion
Yb, Ytterbium (ppm) 1.36 0.100 1.24 1.49 4-Acid Digestion
Zn, Zinc (ppm) 47.8 2.37 45.7 49.9 4-Acid Digestion
Zr, Zirconium (ppm) 113 6 108 118 4-Acid Digestion
Ag, Silver (ppm) 4.65 0.132 4.48 4.81 Aqua Regia Digestion
Al, Aluminium (wt.%) 0.918 0.067 0.874 0.961 Aqua Regia Digestion
As, Arsenic (ppm) 116 4 111 120 Aqua Regia Digestion
B, Boron (ppm) < 10.0 IND IND IND Aqua Regia Digestion
Ba, Barium (ppm) 79 7.4 74 84 Aqua Regia Digestion
Be, Beryllium (ppm) 0.56 0.032 0.53 0.60 Aqua Regia Digestion
Bi, Bismuth (ppm) 4.70 0.327 4.36 5.04 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.332 0.025 0.315 0.350 Aqua Regia Digestion
Cd, Cadmium (ppm) 0.031 0.007 0.017 0.046 Aqua Regia Digestion
Ce, Cerium (ppm) 35.2 3.20 32.9 37.5 Aqua Regia Digestion
Co, Cobalt (ppm) 7.22 0.79 6.70 7.73 Aqua Regia Digestion
Cr, Chromium (ppm) 43.7 2.21 42.0 45.4 Aqua Regia Digestion
Cs, Caesium (ppm) 1.39 0.18 1.25 1.53 Aqua Regia Digestion
Cu, Copper (ppm) 22.8 1.38 21.5 24.0 Aqua Regia Digestion
Eu, Europium (ppm) 0.53 0.10 0.38 0.69 Aqua Regia Digestion
Fe, Iron (wt.%) 2.14 0.148 2.03 2.24 Aqua Regia Digestion
Ga, Gallium (ppm) 3.64 0.256 3.41 3.86 Aqua Regia Digestion
Ge, Germanium (ppm) 0.079 0.028 0.046 0.112 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.51 0.07 0.45 0.57 Aqua Regia Digestion
Hg, Mercury (ppm) 0.042 0.013 0.021 0.064 Aqua Regia Digestion
Ho, Holmium (ppm) 0.25 0.04 0.19 0.31 Aqua Regia Digestion
In, Indium (ppm) 0.024 0.003 0.020 0.027 Aqua Regia Digestion
K, Potassium (wt.%) 0.169 0.021 0.155 0.182 Aqua Regia Digestion
La, Lanthanum (ppm) 17.1 1.9 15.9 18.3 Aqua Regia Digestion
Li, Lithium (ppm) 5.60 0.73 5.02 6.18 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.400 0.022 0.385 0.415 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.016 0.001 0.015 0.016 Aqua Regia Digestion
Mo, Molybdenum (ppm) 6.53 0.421 6.23 6.83 Aqua Regia Digestion
Na, Sodium (wt.%) 0.090 0.007 0.081 0.098 Aqua Regia Digestion
Nb, Niobium (ppm) 0.43 0.12 0.32 0.54 Aqua Regia Digestion
Ni, Nickel (ppm) 40.3 1.98 38.4 42.2 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.036 0.002 0.034 0.037 Aqua Regia Digestion
Pb, Lead (ppm) 8.83 0.90 8.27 9.40 Aqua Regia Digestion
Pr, Praseodymium (ppm) 4.31 0.78 3.21 5.40 Aqua Regia Digestion
Rb, Rubidium (ppm) 12.9 0.66 12.3 13.6 Aqua Regia Digestion
Re, Rhenium (ppm) < 0.001 IND IND IND Aqua Regia Digestion
S, Sulphur (wt.%) 0.022 0.003 0.020 0.024 Aqua Regia Digestion
Sb, Antimony (ppm) 1.82 0.21 1.67 1.96 Aqua Regia Digestion
Sc, Scandium (ppm) 2.19 0.192 2.05 2.34 Aqua Regia Digestion
Sn, Tin (ppm) 1.36 0.25 1.17 1.55 Aqua Regia Digestion
Sr, Strontium (ppm) 35.4 4.2 32.9 37.9 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.010 IND IND IND Aqua Regia Digestion
Tb, Terbium (ppm) 0.29 0.021 0.26 0.33 Aqua Regia Digestion
Te, Tellurium (ppm) 0.089 0.014 0.067 0.112 Aqua Regia Digestion
Th, Thorium (ppm) 6.26 0.576 5.89 6.64 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.066 0.010 0.060 0.072 Aqua Regia Digestion
Tl, Thallium (ppm) 0.11 0.01 0.09 0.12 Aqua Regia Digestion
U, Uranium (ppm) 0.89 0.054 0.85 0.94 Aqua Regia Digestion
V, Vanadium (ppm) 20.2 1.05 19.0 21.3 Aqua Regia Digestion
W, Tungsten (ppm) 8.54 1.33 7.65 9.43 Aqua Regia Digestion
Y, Yttrium (ppm) 6.43 0.203 6.12 6.74 Aqua Regia Digestion
Zn, Zinc (ppm) 28.9 3.2 26.8 31.1 Aqua Regia Digestion
Zr, Zirconium (ppm) 22.9 1.96 21.4 24.5 Aqua Regia Digestion
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