OREAS 258

OREAS 258 was prepared from a blend of gold-bearing oxide ore and barren materials (sedimentary rocks and basaltic scoria). The 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 common primary mineral assemblage as stated by Mason and Harris (2011, 2012, cited in Hingston et al, 2014) is 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.

Twenty-six 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;
  • 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 95% Confidence Limits Low 95% Confidence Limits High Method
Au, Gold (ppm) 11.15 0.259 11.05 11.25 Pb Fire Assay
Au, Gold (ppm) 10.82 0.489 10.58 11.06 Aqua Regia Digestion (sample weights 10-50g)
Au, Gold (ppm) 10.99 0.639 10.67 11.30 Cyanide Leach
Ag, Silver (ppm) 1.72 0.135 1.66 1.79 4-Acid Digestion
Al, Aluminium (wt.%) 6.20 0.246 6.09 6.31 4-Acid Digestion
As, Arsenic (ppm) 256 16 248 265 4-Acid Digestion
Ba, Barium (ppm) 423 22 412 433 4-Acid Digestion
Be, Beryllium (ppm) 1.54 0.099 1.49 1.59 4-Acid Digestion
Bi, Bismuth (ppm) 4.76 0.293 4.64 4.89 4-Acid Digestion
Ca, Calcium (wt.%) 0.719 0.038 0.701 0.737 4-Acid Digestion
Cd, Cadmium (ppm) 0.082 0.018 0.071 0.093 4-Acid Digestion
Ce, Cerium (ppm) 45.0 2.76 43.7 46.4 4-Acid Digestion
Co, Cobalt (ppm) 20.5 1.05 20.0 21.0 4-Acid Digestion
Cr, Chromium (ppm) 236 29 221 251 4-Acid Digestion
Cs, Caesium (ppm) 3.31 0.111 3.25 3.36 4-Acid Digestion
Cu, Copper (ppm) 101 5 99 103 4-Acid Digestion
Dy, Dysprosium (ppm) 2.59 0.075 2.55 2.64 4-Acid Digestion
Er, Erbium (ppm) 1.33 0.055 1.28 1.38 4-Acid Digestion
Eu, Europium (ppm) 0.95 0.10 0.88 1.02 4-Acid Digestion
Fe, Iron (wt.%) 3.74 0.140 3.67 3.81 4-Acid Digestion
Ga, Gallium (ppm) 15.2 0.75 14.9 15.6 4-Acid Digestion
Gd, Gadolinium (ppm) 3.19 0.209 3.05 3.33 4-Acid Digestion
Ge, Germanium (ppm) 0.14 0.02 0.11 0.16 4-Acid Digestion
Hf, Hafnium (ppm) 2.81 0.177 2.72 2.89 4-Acid Digestion
Ho, Holmium (ppm) 0.48 0.020 0.46 0.50 4-Acid Digestion
In, Indium (ppm) 0.050 0.006 0.047 0.054 4-Acid Digestion
K, Potassium (wt.%) 1.50 0.051 1.48 1.53 4-Acid Digestion
La, Lanthanum (ppm) 23.9 1.55 23.1 24.6 4-Acid Digestion
Li, Lithium (ppm) 25.6 1.95 24.6 26.5 4-Acid Digestion
Lu, Lutetium (ppm) 0.16 0.03 0.14 0.19 4-Acid Digestion
Mg, Magnesium (wt.%) 1.64 0.068 1.61 1.68 4-Acid Digestion
Mn, Manganese (wt.%) 0.031 0.001 0.031 0.032 4-Acid Digestion
Mo, Molybdenum (ppm) 6.72 0.623 6.42 7.02 4-Acid Digestion
Na, Sodium (wt.%) 0.430 0.015 0.423 0.437 4-Acid Digestion
Nb, Niobium (ppm) 11.0 1.04 10.4 11.6 4-Acid Digestion
Nd, Neodymium (ppm) 19.7 0.53 19.4 20.1 4-Acid Digestion
Ni, Nickel (ppm) 99 4.7 96 101 4-Acid Digestion
P, Phosphorus (wt.%) 0.040 0.002 0.039 0.041 4-Acid Digestion
Pb, Lead (ppm) 15.8 1.07 15.3 16.3 4-Acid Digestion
Pr, Praseodymium (ppm) 5.15 0.402 4.88 5.42 4-Acid Digestion
Rb, Rubidium (ppm) 67 2.5 66 68 4-Acid Digestion
Re, Rhenium (ppm) < 0.002 IND IND IND 4-Acid Digestion
S, Sulphur (wt.%) 0.070 0.003 0.069 0.072 4-Acid Digestion
Sb, Antimony (ppm) 12.2 0.63 11.8 12.6 4-Acid Digestion
Sc, Scandium (ppm) 17.9 1.67 17.0 18.7 4-Acid Digestion
Se, Selenium (ppm) 0.94 0.16 0.81 1.07 4-Acid Digestion
Sm, Samarium (ppm) 3.90 0.207 3.75 4.05 4-Acid Digestion
Sn, Tin (ppm) 4.69 0.325 4.52 4.87 4-Acid Digestion
Sr, Strontium (ppm) 110 3 109 112 4-Acid Digestion
Ta, Tantalum (ppm) 0.76 0.050 0.73 0.80 4-Acid Digestion
Tb, Terbium (ppm) 0.44 0.031 0.41 0.47 4-Acid Digestion
Te, Tellurium (ppm) 0.32 0.026 0.30 0.34 4-Acid Digestion
Th, Thorium (ppm) 6.80 0.293 6.66 6.95 4-Acid Digestion
Ti, Titanium (wt.%) 0.341 0.022 0.330 0.352 4-Acid Digestion
Tl, Thallium (ppm) 0.41 0.033 0.39 0.43 4-Acid Digestion
Tm, Thulium (ppm) 0.17 0.02 0.15 0.19 4-Acid Digestion
U, Uranium (ppm) 1.40 0.079 1.36 1.44 4-Acid Digestion
V, Vanadium (ppm) 122 4 120 124 4-Acid Digestion
W, Tungsten (ppm) 52 3.6 51 54 4-Acid Digestion
Y, Yttrium (ppm) 12.0 0.79 11.7 12.4 4-Acid Digestion
Yb, Ytterbium (ppm) 1.25 0.101 1.19 1.32 4-Acid Digestion
Zn, Zinc (ppm) 69 4.1 67 71 4-Acid Digestion
Zr, Zirconium (ppm) 109 4 107 111 4-Acid Digestion
Ag, Silver (ppm) 1.57 0.061 1.54 1.61 Aqua Regia Digestion
Al, Aluminium (wt.%) 1.72 0.097 1.66 1.77 Aqua Regia Digestion
As, Arsenic (ppm) 244 18 236 253 Aqua Regia Digestion
B, Boron (ppm) < 10.0 IND IND IND Aqua Regia Digestion
Ba, Barium (ppm) 63 7 59 68 Aqua Regia Digestion
Be, Beryllium (ppm) 0.60 0.09 0.54 0.67 Aqua Regia Digestion
Bi, Bismuth (ppm) 3.96 0.249 3.83 4.10 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.442 0.028 0.428 0.455 Aqua Regia Digestion
Cd, Cadmium (ppm) 0.072 0.008 0.069 0.076 Aqua Regia Digestion
Ce, Cerium (ppm) 32.6 2.37 31.2 34.1 Aqua Regia Digestion
Co, Cobalt (ppm) 19.5 1.19 18.9 20.1 Aqua Regia Digestion
Cr, Chromium (ppm) 191 7 187 195 Aqua Regia Digestion
Cs, Caesium (ppm) 0.67 0.13 0.58 0.76 Aqua Regia Digestion
Cu, Copper (ppm) 98 3.9 96 99 Aqua Regia Digestion
Dy, Dysprosium (ppm) 1.58 0.27 1.23 1.94 Aqua Regia Digestion
Er, Erbium (ppm) 0.72 0.12 0.55 0.88 Aqua Regia Digestion
Eu, Europium (ppm) 0.62 0.13 0.44 0.80 Aqua Regia Digestion
Fe, Iron (wt.%) 3.30 0.184 3.20 3.39 Aqua Regia Digestion
Ga, Gallium (ppm) 4.98 0.205 4.86 5.09 Aqua Regia Digestion
Gd, Gadolinium (ppm) 2.33 0.46 1.92 2.74 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.43 0.08 0.36 0.49 Aqua Regia Digestion
Hg, Mercury (ppm) 0.20 0.02 0.18 0.21 Aqua Regia Digestion
Ho, Holmium (ppm) 0.29 0.04 0.25 0.33 Aqua Regia Digestion
In, Indium (ppm) 0.017 0.002 0.015 0.019 Aqua Regia Digestion
K, Potassium (wt.%) 0.196 0.025 0.184 0.209 Aqua Regia Digestion
La, Lanthanum (ppm) 17.3 0.70 17.0 17.7 Aqua Regia Digestion
Li, Lithium (ppm) 13.9 0.89 13.3 14.5 Aqua Regia Digestion
Mg, Magnesium (wt.%) 1.33 0.057 1.30 1.36 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.027 0.001 0.026 0.027 Aqua Regia Digestion
Mo, Molybdenum (ppm) 5.62 0.369 5.42 5.81 Aqua Regia Digestion
Na, Sodium (wt.%) 0.097 0.007 0.093 0.100 Aqua Regia Digestion
Nd, Neodymium (ppm) 14.3 2.7 12.0 16.6 Aqua Regia Digestion
Ni, Nickel (ppm) 89 4.3 87 91 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.031 0.002 0.030 0.032 Aqua Regia Digestion
Pb, Lead (ppm) 11.5 1.2 10.8 12.2 Aqua Regia Digestion
Pr, Praseodymium (ppm) 3.66 0.69 3.06 4.27 Aqua Regia Digestion
Rb, Rubidium (ppm) 10.8 1.8 9.6 11.9 Aqua Regia Digestion
Re, Rhenium (ppm) < 0.001 IND IND IND Aqua Regia Digestion
S, Sulphur (wt.%) 0.070 0.007 0.066 0.074 Aqua Regia Digestion
Sb, Antimony (ppm) 8.98 1.23 8.34 9.61 Aqua Regia Digestion
Sc, Scandium (ppm) 6.58 0.401 6.34 6.83 Aqua Regia Digestion
Sm, Samarium (ppm) 2.75 0.54 2.27 3.23 Aqua Regia Digestion
Sn, Tin (ppm) 0.75 0.20 0.63 0.87 Aqua Regia Digestion
Sr, Strontium (ppm) 22.0 2.4 20.8 23.3 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.050 IND IND IND Aqua Regia Digestion
Tb, Terbium (ppm) 0.32 0.06 0.25 0.39 Aqua Regia Digestion
Te, Tellurium (ppm) 0.24 0.02 0.23 0.26 Aqua Regia Digestion
Th, Thorium (ppm) 5.14 0.57 4.82 5.46 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.046 0.007 0.042 0.050 Aqua Regia Digestion
Tl, Thallium (ppm) 0.11 0.009 0.11 0.12 Aqua Regia Digestion
U, Uranium (ppm) 0.67 0.036 0.65 0.70 Aqua Regia Digestion
V, Vanadium (ppm) 58 3.8 57 60 Aqua Regia Digestion
W, Tungsten (ppm) 15.1 3.0 13.4 16.8 Aqua Regia Digestion
Y, Yttrium (ppm) 7.15 0.209 7.04 7.27 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.57 0.07 0.51 0.62 Aqua Regia Digestion
Zn, Zinc (ppm) 59 4.4 56 61 Aqua Regia Digestion
Zr, Zirconium (ppm) 18.8 1.13 17.9 19.6 Aqua Regia Digestion
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