OREAS 267

OREAS 267 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 the states of New South Wales and Victoria, 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 i faulted block of Silurian age Granodiorite, intruded by Permian rhyolitic ignimbrite dykes and vein breccias. Epithermal and mesothermal gold mineralisation occurs within quartz veining, stockworks and breccias associated with Permian rhyolitic volcanic dykes and highly fractured granodiorite.

Thirty-eight commercial analytical laboratories participated in the program to certify the elements reported below using the following methods:

  • Gold by Pb collection fire assay (25-50 g charge weight)
    with AAS, ICP-OES or gravimetric finish
  • Gold by PhotonAssay™ with a recommended gross fill mass of 400-430 g
  • Gold by 15-50g aqua regia digestion with ICP-MS and AAS finish
  • Gold by cyanide leach (20-200g) via a variety of cyanide leach methods (LeachWELL tablets, alkaline added sodium cyanide solution and sodium cyanide liquor with LeachWELL powder) with ICP or AAS finish
  • Full ICP-OES and ICP-MS elemental suites by 4-acid (HNO3-HF-HClO4-HCl) 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. This format enabled a nested ANOVA treatment of the INAA results to compare within- and between-unit variances, providing a statistical measure of batch homogeneity.

Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
Au, Gold (ppm) 13.21 0.400 13.06 13.36 Pb Fire Assay
Au, Gold (ppm) 13.56 0.284 13.46 13.66 PhotonAssay
Au, Gold (ppm) 13.42 0.526 13.14 13.69 Aqua Regia Digestion (sample weights 10-50g)
Au, Gold (ppm) 12.96 0.643 12.65 13.26 Cyanide Leach
Ag, Silver (ppm) 5.54 0.215 5.32 5.76 4-Acid Digestion
Al, Aluminium (wt.%) 5.05 0.186 4.91 5.18 4-Acid Digestion
As, Arsenic (ppm) 137 5 131 142 4-Acid Digestion
Ba, Barium (ppm) 381 12 369 393 4-Acid Digestion
Be, Beryllium (ppm) 1.80 0.072 1.73 1.88 4-Acid Digestion
Bi, Bismuth (ppm) 1.28 0.123 1.17 1.39 4-Acid Digestion
Ca, Calcium (wt.%) 1.13 0.031 1.10 1.16 4-Acid Digestion
Ce, Cerium (ppm) 58 3.2 55 62 4-Acid Digestion
Co, Cobalt (ppm) 11.0 0.26 10.6 11.5 4-Acid Digestion
Cr, Chromium (ppm) 98 7.1 92 104 4-Acid Digestion
Cs, Caesium (ppm) 5.50 0.154 5.25 5.75 4-Acid Digestion
Cu, Copper (ppm) 23.9 1.39 22.6 25.2 4-Acid Digestion
Dy, Dysprosium (ppm) 3.07 0.092 2.87 3.27 4-Acid Digestion
Er, Erbium (ppm) 1.50 0.093 1.33 1.67 4-Acid Digestion
Eu, Europium (ppm) 1.03 0.039 0.93 1.13 4-Acid Digestion
Fe, Iron (wt.%) 2.86 0.068 2.80 2.93 4-Acid Digestion
Ga, Gallium (ppm) 14.5 0.74 13.7 15.3 4-Acid Digestion
Gd, Gadolinium (ppm) 4.10 0.324 3.52 4.69 4-Acid Digestion
Hf, Hafnium (ppm) 2.96 0.195 2.75 3.17 4-Acid Digestion
Ho, Holmium (ppm) 0.56 0.029 0.51 0.62 4-Acid Digestion
In, Indium (ppm) 0.061 0.005 0.052 0.069 4-Acid Digestion
K, Potassium (wt.%) 1.25 0.023 1.22 1.27 4-Acid Digestion
La, Lanthanum (ppm) 31.0 1.28 29.7 32.2 4-Acid Digestion
Li, Lithium (ppm) 55 2.1 53 57 4-Acid Digestion
Lu, Lutetium (ppm) 0.20 0.007 0.18 0.22 4-Acid Digestion
Mg, Magnesium (wt.%) 0.929 0.034 0.904 0.953 4-Acid Digestion
Mn, Manganese (wt.%) 0.028 0.001 0.027 0.028 4-Acid Digestion
Mo, Molybdenum (ppm) 6.94 0.345 6.55 7.32 4-Acid Digestion
Na, Sodium (wt.%) 0.505 0.022 0.489 0.520 4-Acid Digestion
Nb, Niobium (ppm) 13.9 0.98 13.0 14.7 4-Acid Digestion
Nd, Neodymium (ppm) 26.7 0.85 25.1 28.2 4-Acid Digestion
Ni, Nickel (ppm) 48.9 2.39 46.7 51.1 4-Acid Digestion
P, Phosphorus (wt.%) 0.048 0.001 0.046 0.049 4-Acid Digestion
Pb, Lead (ppm) 15.2 1.50 13.9 16.5 4-Acid Digestion
Pr, Praseodymium (ppm) 6.95 0.341 6.45 7.45 4-Acid Digestion
Rb, Rubidium (ppm) 71 2.6 68 74 4-Acid Digestion
Re, Rhenium (ppm) < 0.002 IND IND IND 4-Acid Digestion
S, Sulphur (wt.%) 0.024 0.004 0.023 0.026 4-Acid Digestion
Sb, Antimony (ppm) 5.15 1.59 4.15 6.14 4-Acid Digestion
Sc, Scandium (ppm) 9.25 0.602 8.72 9.78 4-Acid Digestion
Sm, Samarium (ppm) 5.11 0.186 4.72 5.49 4-Acid Digestion
Sn, Tin (ppm) 5.95 0.288 5.56 6.34 4-Acid Digestion
Sr, Strontium (ppm) 159 4 155 163 4-Acid Digestion
Ta, Tantalum (ppm) 0.93 0.037 0.87 0.99 4-Acid Digestion
Tb, Terbium (ppm) 0.54 0.016 0.52 0.57 4-Acid Digestion
Te, Tellurium (ppm) 0.068 0.011 0.038 0.098 4-Acid Digestion
Th, Thorium (ppm) 9.13 0.340 8.74 9.53 4-Acid Digestion
Ti, Titanium (wt.%) 0.373 0.013 0.361 0.385 4-Acid Digestion
Tl, Thallium (ppm) 0.39 0.025 0.37 0.42 4-Acid Digestion
U, Uranium (ppm) 1.93 0.121 1.81 2.05 4-Acid Digestion
V, Vanadium (ppm) 68 1.9 66 70 4-Acid Digestion
W, Tungsten (ppm) 7.32 0.360 6.99 7.65 4-Acid Digestion
Y, Yttrium (ppm) 14.0 0.70 13.2 14.8 4-Acid Digestion
Yb, Ytterbium (ppm) 1.38 0.070 1.26 1.49 4-Acid Digestion
Zn, Zinc (ppm) 43.4 1.60 41.8 45.1 4-Acid Digestion
Zr, Zirconium (ppm) 112 3 107 118 4-Acid Digestion
Ag, Silver (ppm) 5.35 0.180 5.16 5.54 Aqua Regia Digestion
Al, Aluminium (wt.%) 0.879 0.080 0.820 0.938 Aqua Regia Digestion
As, Arsenic (ppm) 112 4 107 116 Aqua Regia Digestion
Ba, Barium (ppm) 71 9 67 76 Aqua Regia Digestion
Be, Beryllium (ppm) 0.52 0.018 0.49 0.55 Aqua Regia Digestion
Bi, Bismuth (ppm) 1.03 0.085 0.94 1.13 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.279 0.024 0.262 0.296 Aqua Regia Digestion
Ce, Cerium (ppm) 31.9 2.61 29.7 34.0 Aqua Regia Digestion
Co, Cobalt (ppm) 7.02 0.582 6.53 7.50 Aqua Regia Digestion
Cr, Chromium (ppm) 46.8 2.09 44.8 48.7 Aqua Regia Digestion
Cs, Caesium (ppm) 1.18 0.057 1.13 1.24 Aqua Regia Digestion
Cu, Copper (ppm) 19.7 1.10 18.7 20.7 Aqua Regia Digestion
Fe, Iron (wt.%) 2.02 0.094 1.94 2.11 Aqua Regia Digestion
Ga, Gallium (ppm) 3.71 0.43 3.41 4.02 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.48 0.05 0.44 0.53 Aqua Regia Digestion
Hg, Mercury (ppm) 0.043 0.008 0.030 0.055 Aqua Regia Digestion
In, Indium (ppm) 0.020 0.002 0.017 0.024 Aqua Regia Digestion
K, Potassium (wt.%) 0.158 0.020 0.144 0.172 Aqua Regia Digestion
La, Lanthanum (ppm) 15.2 1.30 14.1 16.2 Aqua Regia Digestion
Li, Lithium (ppm) 5.56 0.60 5.10 6.01 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.371 0.022 0.353 0.389 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.015 0.001 0.014 0.015 Aqua Regia Digestion
Mo, Molybdenum (ppm) 5.89 0.235 5.69 6.09 Aqua Regia Digestion
Na, Sodium (wt.%) 0.083 0.012 0.072 0.093 Aqua Regia Digestion
Nb, Niobium (ppm) 0.35 0.07 0.29 0.41 Aqua Regia Digestion
Ni, Nickel (ppm) 39.6 2.59 37.3 42.0 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.032 0.001 0.030 0.033 Aqua Regia Digestion
Pb, Lead (ppm) 8.60 0.92 7.91 9.30 Aqua Regia Digestion
Rb, Rubidium (ppm) 11.2 0.91 10.4 12.1 Aqua Regia Digestion
Re, Rhenium (ppm) < 0.001 IND IND IND Aqua Regia Digestion
S, Sulphur (wt.%) 0.022 0.004 0.020 0.024 Aqua Regia Digestion
Sc, Scandium (ppm) 2.23 0.198 1.99 2.47 Aqua Regia Digestion
Sn, Tin (ppm) 1.18 0.16 1.01 1.34 Aqua Regia Digestion
Sr, Strontium (ppm) 30.6 3.1 28.2 33.1 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.010 IND IND IND Aqua Regia Digestion
Te, Tellurium (ppm) 0.053 0.011 0.032 0.075 Aqua Regia Digestion
Th, Thorium (ppm) 5.96 0.328 5.65 6.28 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.060 0.011 0.053 0.067 Aqua Regia Digestion
Tl, Thallium (ppm) 0.090 0.013 0.079 0.101 Aqua Regia Digestion
U, Uranium (ppm) 0.90 0.035 0.85 0.95 Aqua Regia Digestion
V, Vanadium (ppm) 20.8 0.75 19.7 21.9 Aqua Regia Digestion
W, Tungsten (ppm) 1.81 0.25 1.57 2.06 Aqua Regia Digestion
Y, Yttrium (ppm) 6.29 0.463 5.92 6.66 Aqua Regia Digestion
Zn, Zinc (ppm) 23.5 2.34 21.8 25.2 Aqua Regia Digestion
Zr, Zirconium (ppm) 21.3 1.03 20.2 22.3 Aqua Regia Digestion
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