OREAS 254c

OREAS 254c was prepared from a blend of gold-bearing oxide ores and barren materials (basaltic scoria, quartz and mudstone). The predominant oxide ore was sourced from the Wilber Lode from the Andy Well Gold Project located approximately 45km north of Meekatharra in the Murchison region of Western Australia. The Wilber Lode is a shear- hosted, narrow vein, quartz lode-style gold deposit situated within the Meekatharra-Wydgee greenstone belt in the Archaean Yilgarn Craton of Western Australia. The Wilber Lode contains a common primary mineral assemblage of quartz, calcite, chlorite, fuchsite, pyrite, galena, sphalerite, chalcopyrite and gold. The host rock consists of a complex sequence of weathered Archaean meta-basalt and meta-porphyritic rocks derived from a primary mineralogy of albite, actinolite, chlorite, sericite, biotite, calcite, zoisite, muscovite, quartz and titanate. A lesser quantity of gold oxide ore from the Agate Creek Gold Project was also blended into OREAS 254c. The Agate Creek Gold project is 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 meso thermal gold mineralisation occurs within quartz veining, stockworks and breccias associated with Permian felsic volcanic units and Proterozoic batholith. 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 (ppm) 2.57 0.082 2.53 2.60 Pb Fire Assay
Au, Gold (ppm) 2.55 0.086 2.50 2.59 Aqua Regia Digestion (sample weights 10-50g)
Au, Gold (ppm) 2.49 0.145 2.41 2.57 Cyanide Leach
Au, Gold (ppm) 2.55 0.075 2.52 2.59 PhotonAssay
Ag, Silver (ppm) 0.927 0.070 0.836 1.019 4-Acid Digestion
Al, Aluminium (wt.%) 5.08 0.094 4.95 5.21 4-Acid Digestion
As, Arsenic (ppm) 17.6 1.33 16.1 19.1 4-Acid Digestion
Ba, Barium (ppm) 340 11 329 351 4-Acid Digestion
Be, Beryllium (ppm) 1.93 0.117 1.82 2.05 4-Acid Digestion
Bi, Bismuth (ppm) 0.35 0.023 0.32 0.37 4-Acid Digestion
Ca, Calcium (wt.%) 1.46 0.034 1.43 1.49 4-Acid Digestion
Cd, Cadmium (ppm) 0.071 0.015 0.048 0.095 4-Acid Digestion
Ce, Cerium (ppm) 70 2.2 67 72 4-Acid Digestion
Co, Cobalt (ppm) 20.1 1.17 19.2 21.0 4-Acid Digestion
Cr, Chromium (ppm) 111 7 103 118 4-Acid Digestion
Cs, Caesium (ppm) 2.47 0.117 2.37 2.58 4-Acid Digestion
Cu, Copper (ppm) 31.4 2.65 29.6 33.2 4-Acid Digestion
Dy, Dysprosium (ppm) 3.44 0.107 3.24 3.65 4-Acid Digestion
Er, Erbium (ppm) 1.59 0.056 1.49 1.69 4-Acid Digestion
Eu, Europium (ppm) 1.50 0.116 1.35 1.65 4-Acid Digestion
Fe, Iron (wt.%) 3.93 0.085 3.83 4.04 4-Acid Digestion
Ga, Gallium (ppm) 15.0 1.22 14.2 15.9 4-Acid Digestion
Gd, Gadolinium (ppm) 5.31 0.465 4.71 5.92 4-Acid Digestion
Hf, Hafnium (ppm) 4.41 0.323 4.13 4.68 4-Acid Digestion
Ho, Holmium (ppm) 0.61 0.046 0.55 0.67 4-Acid Digestion
In, Indium (ppm) 0.060 0.007 0.047 0.072 4-Acid Digestion
K, Potassium (wt.%) 1.29 0.047 1.25 1.32 4-Acid Digestion
La, Lanthanum (ppm) 37.9 1.49 36.2 39.6 4-Acid Digestion
Li, Lithium (ppm) 24.1 1.43 23.1 25.2 4-Acid Digestion
Lu, Lutetium (ppm) 0.17 0.017 0.15 0.20 4-Acid Digestion
Mg, Magnesium (wt.%) 1.51 0.028 1.47 1.55 4-Acid Digestion
Mn, Manganese (wt.%) 0.046 0.001 0.045 0.047 4-Acid Digestion
Mo, Molybdenum (ppm) 3.87 0.228 3.60 4.13 4-Acid Digestion
Na, Sodium (wt.%) 0.969 0.023 0.941 0.998 4-Acid Digestion
Nb, Niobium (ppm) 30.5 2.30 28.6 32.5 4-Acid Digestion
Nd, Neodymium (ppm) 32.0 4.4 26.8 37.1 4-Acid Digestion
Ni, Nickel (ppm) 86 3.3 83 89 4-Acid Digestion
P, Phosphorus (wt.%) 0.089 0.002 0.086 0.091 4-Acid Digestion
Pb, Lead (ppm) 10.7 0.90 10.0 11.4 4-Acid Digestion
Pr, Praseodymium (ppm) 8.49 0.405 7.83 9.15 4-Acid Digestion
Rb, Rubidium (ppm) 65 4.4 61 68 4-Acid Digestion
Re, Rhenium (ppm) < 0.002 IND IND IND 4-Acid Digestion
S, Sulphur (wt.%) 0.020 0.001 0.019 0.021 4-Acid Digestion
Sb, Antimony (ppm) 1.17 0.071 1.06 1.27 4-Acid Digestion
Sc, Scandium (ppm) 10.1 0.35 9.7 10.5 4-Acid Digestion
Sm, Samarium (ppm) 6.04 0.299 5.71 6.37 4-Acid Digestion
Sn, Tin (ppm) 3.75 0.171 3.51 3.98 4-Acid Digestion
Sr, Strontium (ppm) 285 13 274 297 4-Acid Digestion
Ta, Tantalum (ppm) 1.97 0.147 1.83 2.10 4-Acid Digestion
Tb, Terbium (ppm) 0.68 0.041 0.62 0.73 4-Acid Digestion
Th, Thorium (ppm) 8.37 0.553 7.87 8.87 4-Acid Digestion
Ti, Titanium (wt.%) 0.532 0.015 0.517 0.546 4-Acid Digestion
Tl, Thallium (ppm) 0.36 0.017 0.34 0.38 4-Acid Digestion
Tm, Thulium (ppm) 0.20 0.011 0.18 0.21 4-Acid Digestion
U, Uranium (ppm) 1.53 0.079 1.42 1.65 4-Acid Digestion
V, Vanadium (ppm) 69 1.8 67 71 4-Acid Digestion
W, Tungsten (ppm) 3.20 0.177 3.01 3.39 4-Acid Digestion
Y, Yttrium (ppm) 15.4 0.72 14.8 16.1 4-Acid Digestion
Yb, Ytterbium (ppm) 1.26 0.051 1.16 1.37 4-Acid Digestion
Zn, Zinc (ppm) 75 2.7 72 77 4-Acid Digestion
Zr, Zirconium (ppm) 189 8 182 196 4-Acid Digestion
Ag, Silver (ppm) 0.928 0.030 0.891 0.965 Aqua Regia Digestion
Al, Aluminium (wt.%) 1.69 0.158 1.58 1.79 Aqua Regia Digestion
As, Arsenic (ppm) 9.25 0.772 8.57 9.93 Aqua Regia Digestion
B, Boron (ppm) < 10.0 IND IND IND Aqua Regia Digestion
Ba, Barium (ppm) 95 6.5 88 101 Aqua Regia Digestion
Be, Beryllium (ppm) 1.08 0.084 0.99 1.17 Aqua Regia Digestion
Bi, Bismuth (ppm) 0.31 0.024 0.29 0.33 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.473 0.051 0.440 0.505 Aqua Regia Digestion
Cd, Cadmium (ppm) 0.055 0.015 0.038 0.072 Aqua Regia Digestion
Ce, Cerium (ppm) 39.7 1.81 37.9 41.5 Aqua Regia Digestion
Co, Cobalt (ppm) 16.7 0.99 15.8 17.6 Aqua Regia Digestion
Cr, Chromium (ppm) 60 7 56 65 Aqua Regia Digestion
Cs, Caesium (ppm) 0.92 0.092 0.85 1.00 Aqua Regia Digestion
Cu, Copper (ppm) 26.9 2.29 25.1 28.6 Aqua Regia Digestion
Fe, Iron (wt.%) 2.98 0.214 2.83 3.13 Aqua Regia Digestion
Ga, Gallium (ppm) 6.05 0.545 5.57 6.52 Aqua Regia Digestion
Ge, Germanium (ppm) 0.11 0.02 0.08 0.13 Aqua Regia Digestion
Hg, Mercury (ppm) 0.035 0.010 0.020 0.050 Aqua Regia Digestion
In, Indium (ppm) 0.022 0.002 0.019 0.024 Aqua Regia Digestion
K, Potassium (wt.%) 0.295 0.036 0.273 0.318 Aqua Regia Digestion
La, Lanthanum (ppm) 22.7 1.25 21.4 23.9 Aqua Regia Digestion
Li, Lithium (ppm) 8.73 0.689 8.13 9.32 Aqua Regia Digestion
Mg, Magnesium (wt.%) 1.03 0.078 0.96 1.09 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.033 0.002 0.031 0.034 Aqua Regia Digestion
Mo, Molybdenum (ppm) 3.06 0.33 2.82 3.31 Aqua Regia Digestion
Na, Sodium (wt.%) 0.335 0.024 0.315 0.355 Aqua Regia Digestion
Ni, Nickel (ppm) 76 3.5 72 80 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.052 0.003 0.049 0.054 Aqua Regia Digestion
Pb, Lead (ppm) 8.55 0.659 7.99 9.12 Aqua Regia Digestion
Rb, Rubidium (ppm) 15.3 0.87 14.3 16.2 Aqua Regia Digestion
Re, Rhenium (ppm) < 0.001 IND IND IND Aqua Regia Digestion
S, Sulphur (wt.%) 0.020 0.001 0.019 0.020 Aqua Regia Digestion
Sb, Antimony (ppm) 0.56 0.10 0.48 0.63 Aqua Regia Digestion
Sc, Scandium (ppm) 3.92 0.374 3.58 4.25 Aqua Regia Digestion
Sn, Tin (ppm) 1.26 0.15 1.13 1.39 Aqua Regia Digestion
Sr, Strontium (ppm) 60 2.9 57 62 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.010 IND IND IND Aqua Regia Digestion
Tb, Terbium (ppm) 0.44 0.038 0.39 0.49 Aqua Regia Digestion
Th, Thorium (ppm) 5.62 0.440 5.22 6.02 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.147 0.015 0.136 0.158 Aqua Regia Digestion
Tl, Thallium (ppm) 0.11 0.01 0.10 0.12 Aqua Regia Digestion
U, Uranium (ppm) 0.92 0.067 0.86 0.97 Aqua Regia Digestion
V, Vanadium (ppm) 34.1 2.17 32.3 35.9 Aqua Regia Digestion
W, Tungsten (ppm) 0.56 0.06 0.49 0.64 Aqua Regia Digestion
Y, Yttrium (ppm) 8.90 0.341 8.53 9.27 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.64 0.042 0.59 0.70 Aqua Regia Digestion
Zn, Zinc (ppm) 46.6 4.08 43.9 49.4 Aqua Regia Digestion
Zr, Zirconium (ppm) 34.4 13.6 26.1 42.7 Aqua Regia Digestion
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