OREAS 255c

OREAS 255c was prepared from a blend of gold-bearing oxide ore and barren materials (basaltic scoria, quartz and mudstone). The oxide ore (Wilber Lode) was sourced 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. 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) 4.17 0.085 4.14 4.21 Pb Fire Assay
Au, Gold (ppm) 4.13 0.084 4.10 4.16 Aqua Regia Digestion (sample weights 10-50g)
Au, Gold (ppm) 3.97 0.272 3.83 4.11 Cyanide Leach
Au, Gold (ppm) 4.23 0.123 4.18 4.28 PhotonAssay
Ag, Silver (ppm) 1.11 0.098 1.01 1.20 4-Acid Digestion
Al, Aluminium (wt.%) 6.31 0.100 6.19 6.43 4-Acid Digestion
As, Arsenic (ppm) 174 3 169 178 4-Acid Digestion
Ba, Barium (ppm) 445 11 434 455 4-Acid Digestion
Be, Beryllium (ppm) 2.10 0.116 1.97 2.24 4-Acid Digestion
Bi, Bismuth (ppm) 3.16 0.266 2.95 3.37 4-Acid Digestion
Ca, Calcium (wt.%) 1.26 0.034 1.22 1.31 4-Acid Digestion
Cd, Cadmium (ppm) 0.095 0.016 0.076 0.113 4-Acid Digestion
Ce, Cerium (ppm) 73 1.9 71 76 4-Acid Digestion
Co, Cobalt (ppm) 21.0 0.77 20.1 21.9 4-Acid Digestion
Cr, Chromium (ppm) 169 11 160 177 4-Acid Digestion
Cs, Caesium (ppm) 3.81 0.145 3.65 3.98 4-Acid Digestion
Cu, Copper (ppm) 59 3.4 56 61 4-Acid Digestion
Dy, Dysprosium (ppm) 3.58 0.172 3.35 3.82 4-Acid Digestion
Er, Erbium (ppm) 1.69 0.067 1.57 1.81 4-Acid Digestion
Eu, Europium (ppm) 1.49 0.089 1.33 1.64 4-Acid Digestion
Fe, Iron (wt.%) 4.40 0.086 4.29 4.51 4-Acid Digestion
Ga, Gallium (ppm) 17.7 1.33 16.7 18.6 4-Acid Digestion
Gd, Gadolinium (ppm) 5.05 0.206 4.73 5.37 4-Acid Digestion
Hf, Hafnium (ppm) 4.39 0.298 4.11 4.66 4-Acid Digestion
Ho, Holmium (ppm) 0.64 0.035 0.58 0.70 4-Acid Digestion
In, Indium (ppm) 0.065 0.007 0.057 0.074 4-Acid Digestion
K, Potassium (wt.%) 1.58 0.030 1.53 1.63 4-Acid Digestion
La, Lanthanum (ppm) 39.6 1.36 38.0 41.2 4-Acid Digestion
Li, Lithium (ppm) 26.5 1.18 25.6 27.5 4-Acid Digestion
Lu, Lutetium (ppm) 0.20 0.020 0.18 0.23 4-Acid Digestion
Mg, Magnesium (wt.%) 1.62 0.032 1.56 1.67 4-Acid Digestion
Mn, Manganese (wt.%) 0.043 0.001 0.041 0.044 4-Acid Digestion
Mo, Molybdenum (ppm) 4.85 0.288 4.58 5.13 4-Acid Digestion
Na, Sodium (wt.%) 0.811 0.021 0.786 0.837 4-Acid Digestion
Nb, Niobium (ppm) 26.3 1.30 25.1 27.6 4-Acid Digestion
Nd, Neodymium (ppm) 32.5 0.74 31.0 33.9 4-Acid Digestion
Ni, Nickel (ppm) 95 3.4 92 98 4-Acid Digestion
P, Phosphorus (wt.%) 0.077 0.003 0.074 0.080 4-Acid Digestion
Pb, Lead (ppm) 15.2 0.77 14.5 15.8 4-Acid Digestion
Pr, Praseodymium (ppm) 8.67 0.335 8.14 9.20 4-Acid Digestion
Rb, Rubidium (ppm) 79 5.2 74 83 4-Acid Digestion
Re, Rhenium (ppm) 0.001 0.001 0.001 0.002 4-Acid Digestion
S, Sulphur (wt.%) 0.039 0.005 0.036 0.042 4-Acid Digestion
Sb, Antimony (ppm) 8.01 0.509 7.63 8.38 4-Acid Digestion
Sc, Scandium (ppm) 14.6 0.37 13.9 15.3 4-Acid Digestion
Sm, Samarium (ppm) 6.20 0.139 6.01 6.39 4-Acid Digestion
Sn, Tin (ppm) 5.65 0.275 5.44 5.87 4-Acid Digestion
Sr, Strontium (ppm) 241 11 230 252 4-Acid Digestion
Ta, Tantalum (ppm) 1.76 0.155 1.61 1.90 4-Acid Digestion
Tb, Terbium (ppm) 0.69 0.031 0.64 0.74 4-Acid Digestion
Te, Tellurium (ppm) 0.18 0.03 0.13 0.23 4-Acid Digestion
Th, Thorium (ppm) 9.90 0.688 9.38 10.41 4-Acid Digestion
Ti, Titanium (wt.%) 0.515 0.015 0.497 0.532 4-Acid Digestion
Tl, Thallium (ppm) 0.46 0.022 0.43 0.48 4-Acid Digestion
Tm, Thulium (ppm) 0.21 0.012 0.19 0.23 4-Acid Digestion
U, Uranium (ppm) 1.82 0.098 1.71 1.93 4-Acid Digestion
V, Vanadium (ppm) 98 3.0 95 101 4-Acid Digestion
W, Tungsten (ppm) 33.2 3.09 30.5 36.0 4-Acid Digestion
Y, Yttrium (ppm) 16.1 0.84 15.4 16.9 4-Acid Digestion
Yb, Ytterbium (ppm) 1.42 0.098 1.30 1.53 4-Acid Digestion
Zn, Zinc (ppm) 84 2.7 81 87 4-Acid Digestion
Zr, Zirconium (ppm) 181 8 174 188 4-Acid Digestion
Ag, Silver (ppm) 1.04 0.037 0.99 1.10 Aqua Regia Digestion
Al, Aluminium (wt.%) 1.84 0.19 1.71 1.98 Aqua Regia Digestion
As, Arsenic (ppm) 153 6 147 160 Aqua Regia Digestion
B, Boron (ppm) < 10.0 IND IND IND Aqua Regia Digestion
Ba, Barium (ppm) 94 4.3 90 99 Aqua Regia Digestion
Be, Beryllium (ppm) 1.03 0.043 0.98 1.07 Aqua Regia Digestion
Bi, Bismuth (ppm) 2.67 0.165 2.49 2.84 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.474 0.050 0.444 0.503 Aqua Regia Digestion
Cd, Cadmium (ppm) 0.081 0.012 0.064 0.098 Aqua Regia Digestion
Ce, Cerium (ppm) 43.4 2.09 41.4 45.3 Aqua Regia Digestion
Co, Cobalt (ppm) 18.0 0.76 17.4 18.7 Aqua Regia Digestion
Cr, Chromium (ppm) 108 10 101 114 Aqua Regia Digestion
Cs, Caesium (ppm) 0.99 0.13 0.90 1.09 Aqua Regia Digestion
Cu, Copper (ppm) 55 3.5 53 57 Aqua Regia Digestion
Fe, Iron (wt.%) 3.49 0.247 3.34 3.64 Aqua Regia Digestion
Ga, Gallium (ppm) 6.13 0.63 5.68 6.58 Aqua Regia Digestion
Ge, Germanium (ppm) 0.12 0.03 0.08 0.15 Aqua Regia Digestion
In, Indium (ppm) 0.023 0.002 0.019 0.026 Aqua Regia Digestion
K, Potassium (wt.%) 0.286 0.036 0.264 0.308 Aqua Regia Digestion
La, Lanthanum (ppm) 23.7 1.02 22.5 24.9 Aqua Regia Digestion
Li, Lithium (ppm) 10.4 0.53 10.0 10.9 Aqua Regia Digestion
Mg, Magnesium (wt.%) 1.16 0.045 1.12 1.21 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.032 0.002 0.031 0.033 Aqua Regia Digestion
Mo, Molybdenum (ppm) 3.94 0.386 3.67 4.21 Aqua Regia Digestion
Na, Sodium (wt.%) 0.268 0.020 0.252 0.284 Aqua Regia Digestion
Ni, Nickel (ppm) 84 3.7 80 87 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.048 0.003 0.047 0.050 Aqua Regia Digestion
Pb, Lead (ppm) 11.5 0.94 10.8 12.1 Aqua Regia Digestion
Rb, Rubidium (ppm) 14.6 1.03 13.7 15.5 Aqua Regia Digestion
Re, Rhenium (ppm) 0.001 0.000 0.000 0.001 Aqua Regia Digestion
S, Sulphur (wt.%) 0.034 0.004 0.032 0.037 Aqua Regia Digestion
Sb, Antimony (ppm) 5.23 0.56 4.85 5.61 Aqua Regia Digestion
Sc, Scandium (ppm) 5.20 0.409 4.88 5.51 Aqua Regia Digestion
Sn, Tin (ppm) 1.37 0.20 1.22 1.52 Aqua Regia Digestion
Sr, Strontium (ppm) 52 2.0 51 54 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.010 IND IND IND Aqua Regia Digestion
Tb, Terbium (ppm) 0.45 0.037 0.40 0.50 Aqua Regia Digestion
Te, Tellurium (ppm) 0.12 0.02 0.09 0.15 Aqua Regia Digestion
Th, Thorium (ppm) 6.67 0.336 6.31 7.03 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.114 0.014 0.105 0.123 Aqua Regia Digestion
Tl, Thallium (ppm) 0.12 0.02 0.11 0.14 Aqua Regia Digestion
U, Uranium (ppm) 1.01 0.065 0.96 1.06 Aqua Regia Digestion
V, Vanadium (ppm) 44.8 3.13 42.5 47.2 Aqua Regia Digestion
W, Tungsten (ppm) 10.1 2.0 8.7 11.6 Aqua Regia Digestion
Y, Yttrium (ppm) 9.09 0.396 8.70 9.48 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.68 0.049 0.57 0.80 Aqua Regia Digestion
Zn, Zinc (ppm) 59 5.0 56 62 Aqua Regia Digestion
Zr, Zirconium (ppm) 37.3 6.5 33.0 41.7 Aqua Regia Digestion
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