OREAS 502b

OREAS 502b was prepared from porphyry copper-gold ore and waste samples from a mine deposit located in central western New South Wales, Australia with the addition of a minor quantity of Cu-Mo concentrate.

OREAS 502b contains 109 certified values from the participation of twenty seven commercial analytical laboratories. The following methods were employed:

  • Gold via 25-40g fire assay with AAS (20 labs) or ICP-OES (5 labs) finish;
  • Gold via 15-50g aqua regia digestion with ICP-MS (8 labs), AAS (3 labs) or solvent extraction AAS finish (1 lab);
  • Four acid digestion for full elemental suite ICP-OES and ICP-MS (25 laboratories);
  • Aqua regia digestion for full elemental suite ICP-OES and ICP-MS (23 laboratories);
  • Instrumental neutron activation analysis for Au on 1g subsamples to confirm homogeneity (1 laboratory).
Analyte Certified Value 1SD 95% Confidence Limits Low 95% Confidence Limits High Method
Au, Gold (ppm) 0.494 0.015 0.489 0.500 Pb Fire Assay
Cu, Copper (wt.%) 0.773 0.020 0.765 0.782 4-Acid Digestion
Mo, Molybdenum (ppm) 238 11 232 243 4-Acid Digestion
Ag, Silver (ppm) 2.09 0.173 2.02 2.17 4-Acid Digestion
Al, Aluminium (wt.%) 7.47 0.341 7.33 7.62 4-Acid Digestion
As, Arsenic (ppm) 19.1 3.3 18.1 20.1 4-Acid Digestion
Ba, Barium (ppm) 928 47 906 949 4-Acid Digestion
Be, Beryllium (ppm) 2.57 0.27 2.45 2.69 4-Acid Digestion
Bi, Bismuth (ppm) 5.14 0.71 4.84 5.45 4-Acid Digestion
Ca, Calcium (wt.%) 2.71 0.090 2.67 2.75 4-Acid Digestion
Ce, Cerium (ppm) 61 4.7 59 63 4-Acid Digestion
Co, Cobalt (ppm) 20.2 1.89 19.5 20.9 4-Acid Digestion
Cr, Chromium (ppm) 84 9 80 87 4-Acid Digestion
Cs, Caesium (ppm) 10.3 0.81 9.8 10.7 4-Acid Digestion
Er, Erbium (ppm) 2.43 0.170 2.25 2.61 4-Acid Digestion
Eu, Europium (ppm) 1.29 0.060 1.23 1.35 4-Acid Digestion
Fe, Iron (wt.%) 5.57 0.274 5.45 5.69 4-Acid Digestion
Ga, Gallium (ppm) 18.6 1.27 18.1 19.2 4-Acid Digestion
Gd, Gadolinium (ppm) 4.95 0.211 4.79 5.10 4-Acid Digestion
Hf, Hafnium (ppm) 2.27 0.202 2.16 2.37 4-Acid Digestion
Ho, Holmium (ppm) 0.85 0.039 0.82 0.89 4-Acid Digestion
In, Indium (ppm) 0.60 0.056 0.57 0.63 4-Acid Digestion
K, Potassium (wt.%) 3.06 0.165 2.99 3.13 4-Acid Digestion
La, Lanthanum (ppm) 29.9 2.97 28.7 31.1 4-Acid Digestion
Li, Lithium (ppm) 31.0 3.00 29.6 32.3 4-Acid Digestion
Lu, Lutetium (ppm) 0.34 0.029 0.32 0.37 4-Acid Digestion
Mg, Magnesium (wt.%) 1.54 0.076 1.50 1.57 4-Acid Digestion
Mn, Manganese (ppm) 550 25 540 561 4-Acid Digestion
Na, Sodium (wt.%) 2.06 0.095 2.02 2.10 4-Acid Digestion
Nb, Niobium (ppm) 16.2 1.23 15.6 16.9 4-Acid Digestion
Nd, Neodymium (ppm) 26.9 1.47 25.5 28.3 4-Acid Digestion
Ni, Nickel (ppm) 37.2 3.35 36.0 38.5 4-Acid Digestion
P, Phosphorus (wt.%) 0.100 0.004 0.099 0.102 4-Acid Digestion
Pb, Lead (ppm) 31.5 2.26 30.6 32.3 4-Acid Digestion
Pr, Praseodymium (ppm) 7.13 0.373 6.69 7.57 4-Acid Digestion
Rb, Rubidium (ppm) 167 12 161 173 4-Acid Digestion
S, Sulphur (wt.%) 0.950 0.025 0.941 0.960 4-Acid Digestion
Sb, Antimony (ppm) 1.66 0.18 1.57 1.75 4-Acid Digestion
Sc, Scandium (ppm) 13.2 0.92 12.8 13.5 4-Acid Digestion
Se, Selenium (ppm) 8.47 1.00 7.95 9.00 4-Acid Digestion
Sm, Samarium (ppm) 5.33 0.325 5.00 5.66 4-Acid Digestion
Sn, Tin (ppm) 11.1 0.94 10.7 11.6 4-Acid Digestion
Sr, Strontium (ppm) 350 13 344 356 4-Acid Digestion
Ta, Tantalum (ppm) 1.17 0.20 1.07 1.27 4-Acid Digestion
Tb, Terbium (ppm) 0.74 0.051 0.70 0.77 4-Acid Digestion
Te, Tellurium (ppm) 0.15 0.02 0.15 0.15 4-Acid Digestion
Th, Thorium (ppm) 15.8 1.38 15.1 16.4 4-Acid Digestion
Ti, Titanium (wt.%) 0.440 0.018 0.433 0.447 4-Acid Digestion
Tl, Thallium (ppm) 0.80 0.064 0.77 0.84 4-Acid Digestion
Tm, Thulium (ppm) 0.33 0.022 0.31 0.36 4-Acid Digestion
U, Uranium (ppm) 4.28 0.416 4.09 4.47 4-Acid Digestion
V, Vanadium (ppm) 126 6 124 128 4-Acid Digestion
W, Tungsten (ppm) 3.43 0.61 3.25 3.62 4-Acid Digestion
Y, Yttrium (ppm) 23.3 2.09 22.3 24.2 4-Acid Digestion
Yb, Ytterbium (ppm) 2.30 0.144 2.20 2.41 4-Acid Digestion
Zn, Zinc (ppm) 134 4 132 135 4-Acid Digestion
Zr, Zirconium (ppm) 71 6.6 68 74 4-Acid Digestion
Ag, Silver (ppm) 2.01 0.121 1.96 2.05 Aqua Regia Digestion
Al, Aluminium (wt.%) 1.90 0.111 1.85 1.94 Aqua Regia Digestion
As, Arsenic (ppm) 18.6 2.3 18.0 19.3 Aqua Regia Digestion
Au, Gold (ppm) 0.487 0.018 0.478 0.497 Aqua Regia Digestion
Ba, Barium (ppm) 299 31 285 313 Aqua Regia Digestion
Be, Beryllium (ppm) 0.43 0.07 0.39 0.48 Aqua Regia Digestion
Bi, Bismuth (ppm) 5.22 0.261 5.08 5.36 Aqua Regia Digestion
Ca, Calcium (wt.%) 1.10 0.069 1.06 1.13 Aqua Regia Digestion
Ce, Cerium (ppm) 52 2.5 51 54 Aqua Regia Digestion
Co, Cobalt (ppm) 19.0 0.98 18.6 19.3 Aqua Regia Digestion
Cr, Chromium (ppm) 79 4.3 77 80 Aqua Regia Digestion
Cs, Caesium (ppm) 8.34 0.243 8.20 8.47 Aqua Regia Digestion
Cu, Copper (wt.%) 0.758 0.023 0.749 0.768 Aqua Regia Digestion
Fe, Iron (wt.%) 5.02 0.295 4.89 5.15 Aqua Regia Digestion
Ga, Gallium (ppm) 8.58 0.650 8.24 8.91 Aqua Regia Digestion
Ge, Germanium (ppm) 0.22 0.03 0.19 0.25 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.43 0.06 0.39 0.46 Aqua Regia Digestion
In, Indium (ppm) 0.58 0.031 0.56 0.59 Aqua Regia Digestion
K, Potassium (wt.%) 0.941 0.071 0.912 0.970 Aqua Regia Digestion
La, Lanthanum (ppm) 25.4 1.78 24.6 26.2 Aqua Regia Digestion
Li, Lithium (ppm) 29.1 2.23 28.2 30.1 Aqua Regia Digestion
Lu, Lutetium (ppm) 0.20 0.018 0.18 0.22 Aqua Regia Digestion
Mg, Magnesium (wt.%) 1.22 0.041 1.21 1.24 Aqua Regia Digestion
Mn, Manganese (ppm) 398 23 388 407 Aqua Regia Digestion
Mo, Molybdenum (ppm) 229 16 222 235 Aqua Regia Digestion
Na, Sodium (wt.%) 0.148 0.026 0.136 0.159 Aqua Regia Digestion
Nb, Niobium (ppm) 1.44 0.27 1.25 1.63 Aqua Regia Digestion
Nd, Neodymium (ppm) 23.1 1.40 21.5 24.7 Aqua Regia Digestion
Ni, Nickel (ppm) 33.5 1.82 32.8 34.2 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.098 0.004 0.097 0.100 Aqua Regia Digestion
Pb, Lead (ppm) 19.6 0.90 19.2 20.1 Aqua Regia Digestion
Pr, Praseodymium (ppm) 6.27 0.303 5.94 6.61 Aqua Regia Digestion
Rb, Rubidium (ppm) 106 5 103 108 Aqua Regia Digestion
Re, Rhenium (ppm) 0.005 0.001 0.005 0.005 Aqua Regia Digestion
S, Sulphur (wt.%) 0.970 0.061 0.942 0.997 Aqua Regia Digestion
Sb, Antimony (ppm) 1.09 0.15 1.00 1.17 Aqua Regia Digestion
Sc, Scandium (ppm) 7.00 0.96 6.59 7.41 Aqua Regia Digestion
Se, Selenium (ppm) 7.97 0.664 7.63 8.31 Aqua Regia Digestion
Sn, Tin (ppm) 9.93 0.528 9.67 10.20 Aqua Regia Digestion
Sr, Strontium (ppm) 63 4.9 61 65 Aqua Regia Digestion
Tb, Terbium (ppm) 0.52 0.015 0.51 0.54 Aqua Regia Digestion
Te, Tellurium (ppm) 0.16 0.03 0.14 0.17 Aqua Regia Digestion
Th, Thorium (ppm) 15.0 0.78 14.6 15.3 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.307 0.024 0.296 0.317 Aqua Regia Digestion
Tl, Thallium (ppm) 0.60 0.027 0.59 0.62 Aqua Regia Digestion
U, Uranium (ppm) 3.93 0.339 3.78 4.08 Aqua Regia Digestion
V, Vanadium (ppm) 114 5 111 116 Aqua Regia Digestion
W, Tungsten (ppm) 2.29 0.34 2.17 2.42 Aqua Regia Digestion
Y, Yttrium (ppm) 15.2 0.70 14.9 15.6 Aqua Regia Digestion
Yb, Ytterbium (ppm) 1.39 0.058 1.34 1.44 Aqua Regia Digestion
Zn, Zinc (ppm) 124 4 122 125 Aqua Regia Digestion
Zr, Zirconium (ppm) 10.9 1.4 10.2 11.6 Aqua Regia Digestion
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