OREAS 291

OREAS 291 was prepared from a blend of high-grade gold-antimony ore and barren metasediments. The ore was sourced from the Costerfield Operation (owned by Mandalay Resources Ltd) located approximately 10km northeast of the town of Heathcote in Victoria, Australia. Twenty-two commercial analytical laboratories participated in the program to certify the following:

  • Au by 25-50g fire assay with AAS or ICP-OES finish;
  • Au by 15-30g aqua regia digestion with ICP-MS, AAS or ICP-OES finish;
  • Sb by peroxide fusion with ICP-OES or ICP-MS finish (and one laboratory used pressed powder pellet with XRF finish);
  • Full ICP-OES and MS elemental suites by 4-acid digestion;
  • Full ICP-OES and MS elemental suites by aqua regia digestion;
  • Instrumental neutron activation analysis (INAA) for Au on 20 x 85mg subsamples to confirm homogeneity (undertaken by the Australian Nuclear Science and Technology Organisation (ANSTO)).
Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
Au, Gold (ppm) 4.20 0.124 4.14 4.25 Pb Fire Assay
Au, Gold (ppm) 3.81 0.183 3.70 3.92 Aqua Regia Digestion (sample weights 10-50g)
Sb, Antimony (wt.%) 1.50 0.076 1.43 1.57 Peroxide Fusion ICP
Ag, Silver (ppm) 0.298 0.028 0.267 0.329 4-Acid Digestion
Al, Aluminium (wt.%) 6.98 0.299 6.79 7.18 4-Acid Digestion
As, Arsenic (ppm) 477 36 446 507 4-Acid Digestion
Ba, Barium (ppm) 698 28 671 725 4-Acid Digestion
Be, Beryllium (ppm) 2.54 0.134 2.40 2.67 4-Acid Digestion
Bi, Bismuth (ppm) 0.41 0.025 0.38 0.45 4-Acid Digestion
Ca, Calcium (wt.%) 0.578 0.029 0.557 0.599 4-Acid Digestion
Cd, Cadmium (ppm) 0.051 0.015 0.030 0.072 4-Acid Digestion
Ce, Cerium (ppm) 77 6.1 72 82 4-Acid Digestion
Co, Cobalt (ppm) 14.0 0.70 13.3 14.7 4-Acid Digestion
Cr, Chromium (ppm) 118 10 107 129 4-Acid Digestion
Cs, Caesium (ppm) 10.9 0.62 10.4 11.5 4-Acid Digestion
Cu, Copper (ppm) 36.0 1.83 34.2 37.7 4-Acid Digestion
Dy, Dysprosium (ppm) 3.00 0.34 2.49 3.51 4-Acid Digestion
Er, Erbium (ppm) 1.60 0.17 1.37 1.83 4-Acid Digestion
Eu, Europium (ppm) 1.12 0.111 0.96 1.28 4-Acid Digestion
Fe, Iron (wt.%) 3.53 0.168 3.41 3.66 4-Acid Digestion
Ga, Gallium (ppm) 18.0 1.09 17.1 19.0 4-Acid Digestion
Gd, Gadolinium (ppm) 4.36 0.405 3.78 4.95 4-Acid Digestion
Hf, Hafnium (ppm) 3.87 0.272 3.61 4.13 4-Acid Digestion
Ho, Holmium (ppm) 0.55 0.07 0.42 0.68 4-Acid Digestion
In, Indium (ppm) 0.063 0.007 0.056 0.070 4-Acid Digestion
K, Potassium (wt.%) 2.78 0.099 2.70 2.86 4-Acid Digestion
La, Lanthanum (ppm) 38.6 3.38 36.5 40.7 4-Acid Digestion
Li, Lithium (ppm) 48.9 2.34 45.9 51.9 4-Acid Digestion
Lu, Lutetium (ppm) 0.26 0.03 0.23 0.30 4-Acid Digestion
Mg, Magnesium (wt.%) 1.37 0.068 1.32 1.42 4-Acid Digestion
Mn, Manganese (wt.%) 0.059 0.003 0.057 0.061 4-Acid Digestion
Mo, Molybdenum (ppm) 1.16 0.20 0.94 1.37 4-Acid Digestion
Na, Sodium (wt.%) 0.590 0.021 0.572 0.608 4-Acid Digestion
Nd, Neodymium (ppm) 33.7 2.52 30.0 37.5 4-Acid Digestion
Ni, Nickel (ppm) 51 2.2 49 53 4-Acid Digestion
P, Phosphorus (wt.%) 0.053 0.005 0.049 0.056 4-Acid Digestion
Pb, Lead (ppm) 26.5 1.26 25.2 27.7 4-Acid Digestion
Pr, Praseodymium (ppm) 9.01 0.535 8.16 9.86 4-Acid Digestion
Rb, Rubidium (ppm) 162 10 151 172 4-Acid Digestion
Re, Rhenium (ppm) < 0.002 IND IND IND 4-Acid Digestion
S, Sulphur (wt.%) 0.822 0.027 0.799 0.845 4-Acid Digestion
Sb, Antimony (wt.%) 1.50 0.157 1.38 1.62 4-Acid Digestion
Sc, Scandium (ppm) 12.7 0.60 12.2 13.1 4-Acid Digestion
Se, Selenium (ppm) 3.98 0.91 3.13 4.83 4-Acid Digestion
Sm, Samarium (ppm) 6.38 0.452 5.79 6.98 4-Acid Digestion
Sn, Tin (ppm) 3.25 0.57 2.80 3.70 4-Acid Digestion
Sr, Strontium (ppm) 117 5 112 123 4-Acid Digestion
Ta, Tantalum (ppm) 0.90 0.085 0.80 1.00 4-Acid Digestion
Tb, Terbium (ppm) 0.53 0.09 0.41 0.65 4-Acid Digestion
Te, Tellurium (ppm) 0.071 0.024 0.042 0.099 4-Acid Digestion
Th, Thorium (ppm) 14.8 1.19 13.8 15.8 4-Acid Digestion
Ti, Titanium (wt.%) 0.305 0.053 0.274 0.336 4-Acid Digestion
Tl, Thallium (ppm) 0.87 0.035 0.84 0.90 4-Acid Digestion
Tm, Thulium (ppm) 0.23 0.04 0.19 0.27 4-Acid Digestion
U, Uranium (ppm) 2.66 0.151 2.52 2.79 4-Acid Digestion
V, Vanadium (ppm) 78 12 69 87 4-Acid Digestion
Y, Yttrium (ppm) 14.8 2.1 13.4 16.3 4-Acid Digestion
Yb, Ytterbium (ppm) 1.60 0.22 1.37 1.83 4-Acid Digestion
Zn, Zinc (ppm) 97 7.4 91 103 4-Acid Digestion
Zr, Zirconium (ppm) 130 9 124 136 4-Acid Digestion
Ag, Silver (ppm) 0.309 0.041 0.264 0.353 Aqua Regia Digestion
Al, Aluminium (wt.%) 2.24 0.155 2.13 2.36 Aqua Regia Digestion
As, Arsenic (ppm) 466 26 448 483 Aqua Regia Digestion
Ba, Barium (ppm) 123 6 116 130 Aqua Regia Digestion
Be, Beryllium (ppm) 1.26 0.17 1.14 1.39 Aqua Regia Digestion
Bi, Bismuth (ppm) 0.42 0.029 0.38 0.45 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.373 0.022 0.360 0.387 Aqua Regia Digestion
Cd, Cadmium (ppm) 0.048 0.010 0.040 0.057 Aqua Regia Digestion
Ce, Cerium (ppm) 45.7 9.3 39.4 52.0 Aqua Regia Digestion
Co, Cobalt (ppm) 13.2 0.80 12.6 13.7 Aqua Regia Digestion
Cr, Chromium (ppm) 86 5.0 83 89 Aqua Regia Digestion
Cs, Caesium (ppm) 6.66 0.368 6.32 7.00 Aqua Regia Digestion
Cu, Copper (ppm) 35.9 1.46 34.1 37.6 Aqua Regia Digestion
Fe, Iron (wt.%) 3.19 0.124 3.11 3.28 Aqua Regia Digestion
Ga, Gallium (ppm) 6.95 0.586 6.47 7.42 Aqua Regia Digestion
Ge, Germanium (ppm) 0.095 0.009 0.076 0.114 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.47 0.09 0.39 0.55 Aqua Regia Digestion
Hg, Mercury (ppm) 0.056 0.009 0.043 0.069 Aqua Regia Digestion
In, Indium (ppm) 0.036 0.005 0.029 0.043 Aqua Regia Digestion
K, Potassium (wt.%) 0.789 0.028 0.765 0.812 Aqua Regia Digestion
La, Lanthanum (ppm) 22.3 4.7 19.7 24.9 Aqua Regia Digestion
Li, Lithium (ppm) 33.8 3.24 31.5 36.0 Aqua Regia Digestion
Mg, Magnesium (wt.%) 1.11 0.041 1.07 1.14 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.051 0.003 0.050 0.053 Aqua Regia Digestion
Mo, Molybdenum (ppm) 1.11 0.071 1.04 1.19 Aqua Regia Digestion
Na, Sodium (wt.%) 0.050 0.004 0.048 0.052 Aqua Regia Digestion
Nb, Niobium (ppm) 0.84 0.16 0.67 1.02 Aqua Regia Digestion
Ni, Nickel (ppm) 47.8 3.85 45.3 50.3 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.047 0.002 0.046 0.049 Aqua Regia Digestion
Pb, Lead (ppm) 19.0 1.56 17.9 20.1 Aqua Regia Digestion
Rb, Rubidium (ppm) 69 5.5 65 74 Aqua Regia Digestion
Re, Rhenium (ppm) < 0.001 IND IND IND Aqua Regia Digestion
S, Sulphur (wt.%) 0.831 0.025 0.807 0.854 Aqua Regia Digestion
Sb, Antimony (wt.%) 1.49 0.066 1.45 1.54 Aqua Regia Digestion
Sc, Scandium (ppm) 6.36 0.600 5.92 6.79 Aqua Regia Digestion
Se, Selenium (ppm) 3.64 0.45 3.17 4.11 Aqua Regia Digestion
Sn, Tin (ppm) 1.41 0.095 1.30 1.52 Aqua Regia Digestion
Sr, Strontium (ppm) 51 4.0 49 54 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.010 IND IND IND Aqua Regia Digestion
Te, Tellurium (ppm) 0.068 0.013 0.053 0.084 Aqua Regia Digestion
Th, Thorium (ppm) 10.1 1.3 8.9 11.3 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.092 0.007 0.087 0.097 Aqua Regia Digestion
Tl, Thallium (ppm) 0.45 0.034 0.43 0.48 Aqua Regia Digestion
U, Uranium (ppm) 1.26 0.18 1.13 1.39 Aqua Regia Digestion
V, Vanadium (ppm) 48.3 1.71 47.1 49.5 Aqua Regia Digestion
W, Tungsten (ppm) 0.59 0.08 0.52 0.67 Aqua Regia Digestion
Y, Yttrium (ppm) 7.82 0.657 7.25 8.39 Aqua Regia Digestion
Zn, Zinc (ppm) 89 2.7 87 91 Aqua Regia Digestion
Zr, Zirconium (ppm) 16.5 4.0 13.8 19.2 Aqua Regia Digestion
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