OREAS 254b

OREAS 254b was prepared from a blend of gold-bearing oxide ore and barren materials (basaltic scoria, quartz and mudstone). 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.

Thirty-five commercial analytical laboratories participated in the program to certify:

  • Gold by fire assay;
  • Full ICP-OES and ICP-MS elemental suites by 4-acid digestion;
  • Gold by 15-50g aqua regia digestion;
  • Gold by cyanide leach.
Analyte Certified Value 1SD 95% Confidence Low 95% Confidence High Method
Au, Gold (ppm) 2.53 0.061 2.51 2.55 Pb Fire Assay
Au, Gold (ppm) 2.50 0.091 2.47 2.53 Aqua Regia Digestion (sample weights 10-50g)
Au, Gold (ppm) 2.45 0.074 2.41 2.49 Cyanide Leach
Ag, Silver (ppm) 0.453 0.055 0.420 0.486 4-Acid Digestion
Al, Aluminium (wt.%) 5.45 0.175 5.38 5.52 4-Acid Digestion
As, Arsenic (ppm) 13.7 1.4 13.0 14.5 4-Acid Digestion
Ba, Barium (ppm) 407 12 403 411 4-Acid Digestion
Be, Beryllium (ppm) 2.20 0.207 2.11 2.29 4-Acid Digestion
Bi, Bismuth (ppm) 0.25 0.014 0.24 0.26 4-Acid Digestion
Ca, Calcium (wt.%) 1.64 0.037 1.63 1.65 4-Acid Digestion
Cd, Cadmium (ppm) 0.073 0.024 0.058 0.087 4-Acid Digestion
Ce, Cerium (ppm) 66 4.4 64 68 4-Acid Digestion
Co, Cobalt (ppm) 27.3 1.70 26.6 28.0 4-Acid Digestion
Cr, Chromium (ppm) 152 25 141 163 4-Acid Digestion
Cs, Caesium (ppm) 2.66 0.116 2.61 2.71 4-Acid Digestion
Cu, Copper (ppm) 42.9 2.41 41.9 43.8 4-Acid Digestion
Dy, Dysprosium (ppm) 3.87 0.226 3.74 3.99 4-Acid Digestion
Er, Erbium (ppm) 1.73 0.113 1.67 1.78 4-Acid Digestion
Eu, Europium (ppm) 1.78 0.124 1.71 1.86 4-Acid Digestion
Fe, Iron (wt.%) 4.38 0.136 4.33 4.43 4-Acid Digestion
Ga, Gallium (ppm) 16.0 0.95 15.6 16.5 4-Acid Digestion
Gd, Gadolinium (ppm) 5.45 0.320 5.26 5.65 4-Acid Digestion
Hf, Hafnium (ppm) 4.76 0.239 4.66 4.87 4-Acid Digestion
Ho, Holmium (ppm) 0.69 0.040 0.66 0.71 4-Acid Digestion
In, Indium (ppm) 0.052 0.006 0.049 0.054 4-Acid Digestion
K, Potassium (wt.%) 1.49 0.043 1.48 1.51 4-Acid Digestion
La, Lanthanum (ppm) 36.3 2.43 35.3 37.4 4-Acid Digestion
Li, Lithium (ppm) 20.2 1.40 19.7 20.7 4-Acid Digestion
Lu, Lutetium (ppm) 0.19 0.012 0.19 0.20 4-Acid Digestion
Mg, Magnesium (wt.%) 1.49 0.053 1.47 1.51 4-Acid Digestion
Mn, Manganese (wt.%) 0.054 0.002 0.053 0.054 4-Acid Digestion
Mo, Molybdenum (ppm) 3.46 0.134 3.40 3.52 4-Acid Digestion
Na, Sodium (wt.%) 1.23 0.045 1.22 1.25 4-Acid Digestion
Nb, Niobium (ppm) 32.8 1.85 32.0 33.6 4-Acid Digestion
Nd, Neodymium (ppm) 32.3 1.48 31.4 33.1 4-Acid Digestion
Ni, Nickel (ppm) 105 6 103 108 4-Acid Digestion
P, Phosphorus (wt.%) 0.109 0.003 0.108 0.110 4-Acid Digestion
Pb, Lead (ppm) 9.85 0.819 9.41 10.29 4-Acid Digestion
Pr, Praseodymium (ppm) 8.51 0.293 8.34 8.67 4-Acid Digestion
Rb, Rubidium (ppm) 61 2.9 60 62 4-Acid Digestion
Re, Rhenium (ppm) 0.002 IND IND IND 4-Acid Digestion
S, Sulphur (wt.%) 0.024 0.004 0.021 0.026 4-Acid Digestion
Sb, Antimony (ppm) 0.73 0.08 0.68 0.77 4-Acid Digestion
Sc, Scandium (ppm) 11.9 0.93 11.4 12.3 4-Acid Digestion
Sm, Samarium (ppm) 6.32 0.328 6.12 6.53 4-Acid Digestion
Sn, Tin (ppm) 2.08 0.095 2.04 2.11 4-Acid Digestion
Sr, Strontium (ppm) 333 11 328 337 4-Acid Digestion
Ta, Tantalum (ppm) 2.10 0.111 2.05 2.16 4-Acid Digestion
Tb, Terbium (ppm) 0.74 0.061 0.69 0.78 4-Acid Digestion
Te, Tellurium (ppm) 0.20 IND IND IND 4-Acid Digestion
Th, Thorium (ppm) 7.33 0.332 7.20 7.46 4-Acid Digestion
Ti, Titanium (wt.%) 0.563 0.030 0.550 0.575 4-Acid Digestion
Tl, Thallium (ppm) 0.27 0.011 0.27 0.28 4-Acid Digestion
Tm, Thulium (ppm) 0.23 0.018 0.22 0.24 4-Acid Digestion
U, Uranium (ppm) 1.63 0.082 1.60 1.67 4-Acid Digestion
V, Vanadium (ppm) 83 5.4 81 85 4-Acid Digestion
W, Tungsten (ppm) 3.76 0.314 3.61 3.92 4-Acid Digestion
Y, Yttrium (ppm) 17.2 0.71 16.9 17.4 4-Acid Digestion
Yb, Ytterbium (ppm) 1.35 0.097 1.29 1.40 4-Acid Digestion
Zn, Zinc (ppm) 89 4.8 88 91 4-Acid Digestion
Zr, Zirconium (ppm) 203 9 199 206 4-Acid Digestion
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