OREAS 506b

OREAS 506b was prepared from a blend of porphyry copper-gold ores, barren granodiorite and minor quantities of Cu and Mo concentrates. The ores were sourced from both the Ridgeway Mine and Northparkes Mine. Both mines are located in the Central West of New South Wales, Australia. The barren granodiorite was sourced from the mafic, S-Type, Late Devonian Bulla Granodiorite complex located in northern Melbourne, Australia. Twenty-eight commercial analytical laboratories participated in the program to certify the following:

  • Gold by fire assay using a 25-50 g charge weight with AAS (12 laboratories), ICP-OES (10 laboratories) or ICP-MS (1 laboratory) finish;
  • Gold by aqua regia digestion using a 10-50 g sample mass with ICP-OES/MS (15 laboratories) or AAS (5 laboratories) finish;
  • Full ICP-OES and MS elemental suites by 4-acid digestion (up to 26 laboratories depending on the element);
  • Full ICP-OES and MS elemental suites by aqua regia digestion (up to 26 laboratories depending on the element).

To evaluate homogeneity, instrumental neutron activation analysis (INAA) of Au on 20 x 1 g subsamples was undertaken at Actlabs Ancaster in Canada.

Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
Cu, Copper (wt.%) 0.446 0.014 0.435 0.457 4-Acid Digestion
Au, Gold (ppm) 0.351 0.008 0.346 0.356 Pb Fire Assay
Mo, Molybdenum (ppm) 88 3.3 85 91 4-Acid Digestion
Au, Gold (ppm) 0.348 0.015 0.341 0.356 Aqua Regia Digestion (sample weights 10-50g)
Ag, Silver (ppm) 1.34 0.092 1.25 1.42 4-Acid Digestion
Al, Aluminium (wt.%) 7.55 0.270 7.32 7.78 4-Acid Digestion
As, Arsenic (ppm) 13.6 1.02 12.3 14.8 4-Acid Digestion
Ba, Barium (ppm) 938 54 899 976 4-Acid Digestion
Be, Beryllium (ppm) 2.25 0.145 2.08 2.41 4-Acid Digestion
Bi, Bismuth (ppm) 0.93 0.13 0.73 1.14 4-Acid Digestion
Ca, Calcium (wt.%) 1.67 0.053 1.63 1.71 4-Acid Digestion
Cd, Cadmium (ppm) 0.40 0.05 0.35 0.45 4-Acid Digestion
Ce, Cerium (ppm) 64 5.1 59 69 4-Acid Digestion
Co, Cobalt (ppm) 7.34 0.448 6.97 7.70 4-Acid Digestion
Cr, Chromium (ppm) 39.5 4.0 37.0 42.1 4-Acid Digestion
Cs, Caesium (ppm) 8.64 0.284 8.31 8.97 4-Acid Digestion
Dy, Dysprosium (ppm) 3.21 0.130 2.99 3.44 4-Acid Digestion
Er, Erbium (ppm) 1.33 0.095 1.18 1.48 4-Acid Digestion
Eu, Europium (ppm) 1.26 0.033 1.18 1.34 4-Acid Digestion
Fe, Iron (wt.%) 2.75 0.076 2.68 2.82 4-Acid Digestion
Ga, Gallium (ppm) 19.3 0.72 18.5 20.1 4-Acid Digestion
Gd, Gadolinium (ppm) 5.13 0.290 4.75 5.52 4-Acid Digestion
Ge, Germanium (ppm) 0.17 0.05 0.11 0.23 4-Acid Digestion
Hf, Hafnium (ppm) 2.09 0.194 1.93 2.25 4-Acid Digestion
Ho, Holmium (ppm) 0.53 0.031 0.48 0.58 4-Acid Digestion
In, Indium (ppm) 0.079 0.006 0.071 0.087 4-Acid Digestion
K, Potassium (wt.%) 3.39 0.085 3.31 3.47 4-Acid Digestion
La, Lanthanum (ppm) 31.8 2.30 29.5 34.1 4-Acid Digestion
Li, Lithium (ppm) 41.8 2.87 39.9 43.7 4-Acid Digestion
Lu, Lutetium (ppm) 0.17 0.015 0.15 0.19 4-Acid Digestion
Mg, Magnesium (wt.%) 0.686 0.028 0.663 0.709 4-Acid Digestion
Mn, Manganese (wt.%) 0.033 0.001 0.032 0.034 4-Acid Digestion
Na, Sodium (wt.%) 2.18 0.070 2.13 2.23 4-Acid Digestion
Nb, Niobium (ppm) 11.1 0.66 10.6 11.7 4-Acid Digestion
Nd, Neodymium (ppm) 28.9 2.11 26.4 31.5 4-Acid Digestion
Ni, Nickel (ppm) 15.7 0.64 14.9 16.5 4-Acid Digestion
P, Phosphorus (wt.%) 0.085 0.003 0.082 0.087 4-Acid Digestion
Pb, Lead (ppm) 56 2.6 54 58 4-Acid Digestion
Pr, Praseodymium (ppm) 7.46 0.627 6.78 8.14 4-Acid Digestion
Rb, Rubidium (ppm) 149 7 142 157 4-Acid Digestion
Re, Rhenium (ppm) 0.035 0.004 0.032 0.038 4-Acid Digestion
S, Sulphur (wt.%) 0.616 0.022 0.596 0.637 4-Acid Digestion
Sb, Antimony (ppm) 1.36 0.116 1.25 1.47 4-Acid Digestion
Sc, Scandium (ppm) 7.70 0.468 7.32 8.09 4-Acid Digestion
Se, Selenium (ppm) 5.02 0.63 4.32 5.73 4-Acid Digestion
Sm, Samarium (ppm) 5.90 0.420 5.35 6.45 4-Acid Digestion
Sn, Tin (ppm) 4.27 0.235 4.04 4.51 4-Acid Digestion
Sr, Strontium (ppm) 276 10 267 286 4-Acid Digestion
Ta, Tantalum (ppm) 0.93 0.063 0.86 0.99 4-Acid Digestion
Tb, Terbium (ppm) 0.67 0.029 0.62 0.72 4-Acid Digestion
Te, Tellurium (ppm) 0.21 0.03 0.17 0.25 4-Acid Digestion
Th, Thorium (ppm) 12.0 0.98 11.0 12.9 4-Acid Digestion
Ti, Titanium (wt.%) 0.319 0.011 0.308 0.329 4-Acid Digestion
Tl, Thallium (ppm) 0.81 0.037 0.76 0.86 4-Acid Digestion
Tm, Thulium (ppm) 0.18 0.015 0.15 0.20 4-Acid Digestion
U, Uranium (ppm) 3.50 0.339 2.99 4.01 4-Acid Digestion
V, Vanadium (ppm) 65 2.7 63 68 4-Acid Digestion
W, Tungsten (ppm) 10.3 0.77 9.4 11.2 4-Acid Digestion
Y, Yttrium (ppm) 14.3 0.73 13.6 15.0 4-Acid Digestion
Yb, Ytterbium (ppm) 1.17 0.069 1.04 1.31 4-Acid Digestion
Zn, Zinc (ppm) 112 5 107 116 4-Acid Digestion
Zr, Zirconium (ppm) 71 2.9 68 74 4-Acid Digestion
Ag, Silver (ppm) 1.31 0.080 1.25 1.38 Aqua Regia Digestion
Al, Aluminium (wt.%) 1.68 0.064 1.62 1.73 Aqua Regia Digestion
As, Arsenic (ppm) 13.0 0.61 12.3 13.6 Aqua Regia Digestion
B, Boron (ppm) < 10.0 IND IND IND Aqua Regia Digestion
Ba, Barium (ppm) 426 22 410 442 Aqua Regia Digestion
Be, Beryllium (ppm) 1.21 0.045 1.17 1.26 Aqua Regia Digestion
Bi, Bismuth (ppm) 0.96 0.10 0.80 1.12 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.695 0.029 0.675 0.716 Aqua Regia Digestion
Cd, Cadmium (ppm) 0.32 0.04 0.29 0.35 Aqua Regia Digestion
Ce, Cerium (ppm) 29.4 1.73 28.0 30.9 Aqua Regia Digestion
Co, Cobalt (ppm) 7.10 0.342 6.81 7.38 Aqua Regia Digestion
Cr, Chromium (ppm) 45.5 2.13 43.8 47.2 Aqua Regia Digestion
Cs, Caesium (ppm) 6.78 0.591 6.40 7.16 Aqua Regia Digestion
Cu, Copper (wt.%) 0.443 0.020 0.430 0.456 Aqua Regia Digestion
Fe, Iron (wt.%) 2.66 0.073 2.60 2.72 Aqua Regia Digestion
Ga, Gallium (ppm) 8.03 0.224 7.72 8.34 Aqua Regia Digestion
Ge, Germanium (ppm) 0.11 0.03 0.08 0.14 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.31 0.024 0.28 0.34 Aqua Regia Digestion
In, Indium (ppm) 0.072 0.004 0.064 0.080 Aqua Regia Digestion
K, Potassium (wt.%) 0.853 0.048 0.825 0.882 Aqua Regia Digestion
La, Lanthanum (ppm) 13.8 0.83 13.0 14.5 Aqua Regia Digestion
Li, Lithium (ppm) 33.4 1.29 32.2 34.6 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.645 0.020 0.626 0.664 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.029 0.001 0.028 0.029 Aqua Regia Digestion
Mo, Molybdenum (ppm) 84 2.4 82 86 Aqua Regia Digestion
Na, Sodium (wt.%) 0.142 0.015 0.132 0.152 Aqua Regia Digestion
Nb, Niobium (ppm) 0.76 0.15 0.62 0.89 Aqua Regia Digestion
Ni, Nickel (ppm) 15.5 0.69 14.8 16.2 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.065 0.003 0.063 0.067 Aqua Regia Digestion
Pb, Lead (ppm) 39.5 2.61 37.9 41.1 Aqua Regia Digestion
Rb, Rubidium (ppm) 79 5.4 75 83 Aqua Regia Digestion
Re, Rhenium (ppm) 0.035 0.003 0.031 0.038 Aqua Regia Digestion
S, Sulphur (wt.%) 0.614 0.024 0.598 0.631 Aqua Regia Digestion
Sb, Antimony (ppm) 0.87 0.13 0.78 0.95 Aqua Regia Digestion
Sc, Scandium (ppm) 6.68 0.346 6.34 7.01 Aqua Regia Digestion
Se, Selenium (ppm) 4.89 0.329 4.52 5.26 Aqua Regia Digestion
Sn, Tin (ppm) 2.95 0.108 2.81 3.09 Aqua Regia Digestion
Sr, Strontium (ppm) 94 3.8 92 97 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.010 IND IND IND Aqua Regia Digestion
Tb, Terbium (ppm) 0.45 0.026 0.41 0.50 Aqua Regia Digestion
Te, Tellurium (ppm) 0.20 0.02 0.16 0.24 Aqua Regia Digestion
Th, Thorium (ppm) 5.67 0.511 5.26 6.07 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.204 0.008 0.196 0.213 Aqua Regia Digestion
Tl, Thallium (ppm) 0.51 0.029 0.49 0.54 Aqua Regia Digestion
U, Uranium (ppm) 2.82 0.191 2.49 3.15 Aqua Regia Digestion
V, Vanadium (ppm) 54 1.6 53 56 Aqua Regia Digestion
W, Tungsten (ppm) 6.42 0.637 5.74 7.11 Aqua Regia Digestion
Y, Yttrium (ppm) 9.63 0.445 9.29 9.98 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.71 0.022 0.68 0.73 Aqua Regia Digestion
Zn, Zinc (ppm) 106 5 102 109 Aqua Regia Digestion
Zr, Zirconium (ppm) 8.60 0.808 8.02 9.19 Aqua Regia Digestion
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