OREAS 247b

OREAS 247b was prepared from a blend of high-grade gold ores and barren metasediments sourced from Australia. The majority of the ore was sourced from the central Victorian goldfields, where gold is hosted in a metamorphosed turbidite sequence of interbedded sandstones, siltstones, and shales. Gold mineralisation is predominantly associated with disseminated arsenopyrite and pyrite, with minor stibnite–quartz zones. Material from the Agate Creek Gold Project in the Etheridge Goldfield of northern Queensland was also included to achieve the target gold grade.

Thirty-seven 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 ICP-MS finish
  • Gold by PhotonAssay™ with a recommended gross fill mass of 350-380 g
  • 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) 42.18 1.243 41.68 42.69 Pb Fire Assay
Au, Gold (ppm) 43.65 0.977 43.17 44.14 PhotonAssay
Ag, Silver (ppm) 15.0 0.61 14.4 15.7 4-Acid Digestion
Al, Aluminium (wt.%) 4.67 0.156 4.53 4.81 4-Acid Digestion
As, Arsenic (wt.%) 0.385 0.015 0.372 0.398 4-Acid Digestion
Ba, Barium (ppm) 368 11 358 379 4-Acid Digestion
Be, Beryllium (ppm) 1.94 0.068 1.85 2.03 4-Acid Digestion
Bi, Bismuth (ppm) 0.66 0.042 0.61 0.70 4-Acid Digestion
Ca, Calcium (wt.%) 0.682 0.020 0.658 0.706 4-Acid Digestion
Cd, Cadmium (ppm) 0.099 0.018 0.076 0.121 4-Acid Digestion
Ce, Cerium (ppm) 59 2.4 57 62 4-Acid Digestion
Co, Cobalt (ppm) 10.3 0.38 9.9 10.7 4-Acid Digestion
Cr, Chromium (ppm) 77 6.3 72 81 4-Acid Digestion
Cs, Caesium (ppm) 7.35 0.289 6.98 7.71 4-Acid Digestion
Cu, Copper (ppm) 245 5 237 252 4-Acid Digestion
Dy, Dysprosium (ppm) 2.30 0.107 2.11 2.49 4-Acid Digestion
Eu, Europium (ppm) 0.68 0.023 0.62 0.73 4-Acid Digestion
Fe, Iron (wt.%) 3.10 0.055 3.02 3.18 4-Acid Digestion
Ga, Gallium (ppm) 15.0 0.88 14.3 15.6 4-Acid Digestion
Hf, Hafnium (ppm) 2.61 0.164 2.38 2.85 4-Acid Digestion
Ho, Holmium (ppm) 0.45 0.035 0.39 0.50 4-Acid Digestion
In, Indium (ppm) 0.067 0.005 0.059 0.074 4-Acid Digestion
K, Potassium (wt.%) 1.82 0.038 1.76 1.87 4-Acid Digestion
La, Lanthanum (ppm) 30.3 1.27 28.8 31.7 4-Acid Digestion
Li, Lithium (ppm) 46.7 2.09 44.7 48.6 4-Acid Digestion
Lu, Lutetium (ppm) 0.20 0.010 0.18 0.22 4-Acid Digestion
Mg, Magnesium (wt.%) 0.828 0.030 0.800 0.856 4-Acid Digestion
Mn, Manganese (wt.%) 0.030 0.001 0.029 0.031 4-Acid Digestion
Mo, Molybdenum (ppm) 29.1 1.38 27.6 30.7 4-Acid Digestion
Na, Sodium (wt.%) 0.264 0.010 0.253 0.275 4-Acid Digestion
Nb, Niobium (ppm) 8.80 0.742 8.10 9.50 4-Acid Digestion
Nd, Neodymium (ppm) 25.8 0.77 24.0 27.6 4-Acid Digestion
Ni, Nickel (ppm) 31.0 1.36 30.1 32.0 4-Acid Digestion
P, Phosphorus (wt.%) 0.037 0.001 0.035 0.038 4-Acid Digestion
Pb, Lead (ppm) 43.0 2.41 40.5 45.4 4-Acid Digestion
Rb, Rubidium (ppm) 117 4 111 124 4-Acid Digestion
Re, Rhenium (ppm) < 0.002 IND IND IND 4-Acid Digestion
S, Sulphur (wt.%) 0.868 0.016 0.842 0.895 4-Acid Digestion
Sb, Antimony (wt.%) 0.365 0.021 0.348 0.381 4-Acid Digestion
Sc, Scandium (ppm) 7.42 0.282 7.01 7.83 4-Acid Digestion
Se, Selenium (ppm) 2.23 0.49 1.43 3.03 4-Acid Digestion
Sm, Samarium (ppm) 4.72 0.165 4.33 5.12 4-Acid Digestion
Sn, Tin (ppm) 3.01 0.244 2.81 3.21 4-Acid Digestion
Sr, Strontium (ppm) 89 2.4 85 92 4-Acid Digestion
Ta, Tantalum (ppm) 0.59 0.030 0.54 0.63 4-Acid Digestion
Tb, Terbium (ppm) 0.43 0.019 0.38 0.48 4-Acid Digestion
Te, Tellurium (ppm) 0.16 0.02 0.12 0.20 4-Acid Digestion
Th, Thorium (ppm) 10.1 0.44 9.4 10.8 4-Acid Digestion
Ti, Titanium (wt.%) 0.209 0.008 0.201 0.218 4-Acid Digestion
Tl, Thallium (ppm) 0.68 0.050 0.64 0.72 4-Acid Digestion
U, Uranium (ppm) 2.27 0.120 2.13 2.40 4-Acid Digestion
V, Vanadium (ppm) 57 2.4 54 59 4-Acid Digestion
W, Tungsten (ppm) 7.73 0.83 7.02 8.44 4-Acid Digestion
Yb, Ytterbium (ppm) 1.33 0.081 1.16 1.49 4-Acid Digestion
Zn, Zinc (ppm) 80 2.7 78 83 4-Acid Digestion
Zr, Zirconium (ppm) 87 2.4 84 91 4-Acid Digestion
Ag, Silver (ppm) 15.0 0.46 14.5 15.6 Aqua Regia Digestion
Al, Aluminium (wt.%) 0.915 0.073 0.829 1.002 Aqua Regia Digestion
As, Arsenic (wt.%) 0.382 0.012 0.370 0.394 Aqua Regia Digestion
Ba, Barium (ppm) 75 5.3 68 82 Aqua Regia Digestion
Be, Beryllium (ppm) 0.63 0.020 0.59 0.67 Aqua Regia Digestion
Bi, Bismuth (ppm) 0.66 0.025 0.63 0.70 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.560 0.019 0.538 0.582 Aqua Regia Digestion
Cd, Cadmium (ppm) 0.097 0.015 0.083 0.112 Aqua Regia Digestion
Ce, Cerium (ppm) 30.8 1.65 28.5 33.2 Aqua Regia Digestion
Co, Cobalt (ppm) 9.73 0.543 9.18 10.27 Aqua Regia Digestion
Cr, Chromium (ppm) 47.1 1.85 44.9 49.2 Aqua Regia Digestion
Cs, Caesium (ppm) 2.20 0.194 2.04 2.36 Aqua Regia Digestion
Cu, Copper (ppm) 245 8 239 252 Aqua Regia Digestion
Fe, Iron (wt.%) 2.83 0.107 2.72 2.94 Aqua Regia Digestion
Ga, Gallium (ppm) 4.18 0.53 3.77 4.58 Aqua Regia Digestion
Ge, Germanium (ppm) 0.066 0.014 0.043 0.089 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.38 0.04 0.33 0.44 Aqua Regia Digestion
Hg, Mercury (ppm) 0.17 0.02 0.14 0.19 Aqua Regia Digestion
In, Indium (ppm) 0.039 0.002 0.036 0.042 Aqua Regia Digestion
K, Potassium (wt.%) 0.359 0.028 0.327 0.391 Aqua Regia Digestion
La, Lanthanum (ppm) 14.5 0.95 13.1 16.0 Aqua Regia Digestion
Li, Lithium (ppm) 7.42 0.614 6.75 8.08 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.592 0.016 0.573 0.610 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.026 0.001 0.026 0.027 Aqua Regia Digestion
Mo, Molybdenum (ppm) 27.1 1.42 26.0 28.2 Aqua Regia Digestion
Na, Sodium (wt.%) 0.035 0.006 0.028 0.041 Aqua Regia Digestion
Ni, Nickel (ppm) 29.4 1.19 27.6 31.1 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.031 0.001 0.029 0.033 Aqua Regia Digestion
Pb, Lead (ppm) 36.7 1.34 34.8 38.6 Aqua Regia Digestion
Rb, Rubidium (ppm) 23.1 2.09 21.1 25.0 Aqua Regia Digestion
S, Sulphur (wt.%) 0.865 0.021 0.844 0.885 Aqua Regia Digestion
Sb, Antimony (wt.%) 0.313 0.018 0.296 0.330 Aqua Regia Digestion
Sc, Scandium (ppm) 2.18 0.211 1.94 2.42 Aqua Regia Digestion
Se, Selenium (ppm) 1.96 0.21 1.64 2.27 Aqua Regia Digestion
Sn, Tin (ppm) 1.08 0.069 1.00 1.17 Aqua Regia Digestion
Sr, Strontium (ppm) 45.7 3.06 43.2 48.1 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.010 IND IND IND Aqua Regia Digestion
Te, Tellurium (ppm) 0.13 0.02 0.11 0.15 Aqua Regia Digestion
Th, Thorium (ppm) 6.34 0.246 5.83 6.85 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.010 0.001 0.009 0.011 Aqua Regia Digestion
Tl, Thallium (ppm) 0.21 0.020 0.20 0.23 Aqua Regia Digestion
U, Uranium (ppm) 0.99 0.044 0.94 1.05 Aqua Regia Digestion
V, Vanadium (ppm) 17.4 1.19 16.0 18.8 Aqua Regia Digestion
W, Tungsten (ppm) 2.50 0.32 2.24 2.77 Aqua Regia Digestion
Y, Yttrium (ppm) 5.12 0.247 4.85 5.40 Aqua Regia Digestion
Zn, Zinc (ppm) 74 1.7 71 76 Aqua Regia Digestion
Zr, Zirconium (ppm) 13.3 0.56 12.7 13.9 Aqua Regia Digestion
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