OREAS 508

OREAS 508 was prepared from a blend of porphyry copper-gold ore, barren granodiorite and a minor quantity of Cu-Mo concentrate. The ore was sourced from Northparkes Mine 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-two commercial analytical laboratories participated in the program to certify the elements shown below. The following methods were employed:

  • Gold by 15-50g fire assay with AAS (17 laboratories) or ICP-OES (4 laboratories) finish;
  • Gold by 10-50g aqua regia digestion with ICP-MS finish (10 laboratories) and AAS (5 laboratories) finish;
  • 4-acid digestion for full elemental suite ICP-OES/MS finish (up to 19 laboratories depending on the element)
  • Aqua regia digestion for full elemental suite ICP-OES/MS and AAS finish (up to 21 laboratories depending on the element).

Gold by instrumental neutron activation analysis (INAA) on 20 x 85mg subsamples was undertaken to confirm homogeneity (at ANSTO, Lucas Heights, Australia).

Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
Cu, Copper (wt.%) 0.548 0.013 0.532 0.563 4-Acid Digestion
Au, Gold (ppm) 0.470 0.016 0.464 0.477 Pb Fire Assay
Mo, Molybdenum (ppm) 152 4 147 157 4-Acid Digestion
Au, Gold (ppm) 0.477 0.025 0.465 0.489 Aqua Regia Digestion (sample weights 10-50g)
Ag, Silver (ppm) 1.40 0.125 1.27 1.53 4-Acid Digestion
Al, Aluminium (wt.%) 7.47 0.431 7.15 7.80 4-Acid Digestion
As, Arsenic (ppm) 14.3 1.33 12.9 15.7 4-Acid Digestion
Ba, Barium (ppm) 934 37 894 975 4-Acid Digestion
Be, Beryllium (ppm) 2.44 0.180 2.24 2.64 4-Acid Digestion
Bi, Bismuth (ppm) 1.13 0.11 0.91 1.34 4-Acid Digestion
Ca, Calcium (wt.%) 1.73 0.067 1.65 1.80 4-Acid Digestion
Cd, Cadmium (ppm) 0.38 0.04 0.34 0.43 4-Acid Digestion
Ce, Cerium (ppm) 64 4.8 59 68 4-Acid Digestion
Co, Cobalt (ppm) 9.42 0.492 8.99 9.85 4-Acid Digestion
Cr, Chromium (ppm) 39.6 4.2 36.5 42.7 4-Acid Digestion
Cs, Caesium (ppm) 8.37 0.543 7.71 9.04 4-Acid Digestion
Dy, Dysprosium (ppm) 3.23 0.300 2.85 3.60 4-Acid Digestion
Er, Erbium (ppm) 1.35 0.17 1.10 1.60 4-Acid Digestion
Eu, Europium (ppm) 1.20 0.087 1.10 1.30 4-Acid Digestion
Fe, Iron (wt.%) 2.93 0.084 2.84 3.03 4-Acid Digestion
Ga, Gallium (ppm) 18.7 0.81 17.8 19.6 4-Acid Digestion
Gd, Gadolinium (ppm) 5.11 0.61 4.44 5.78 4-Acid Digestion
Hf, Hafnium (ppm) 2.13 0.24 1.92 2.34 4-Acid Digestion
Ho, Holmium (ppm) 0.52 0.07 0.41 0.63 4-Acid Digestion
In, Indium (ppm) 0.17 0.011 0.15 0.18 4-Acid Digestion
K, Potassium (wt.%) 3.38 0.106 3.27 3.49 4-Acid Digestion
La, Lanthanum (ppm) 30.8 2.87 28.3 33.2 4-Acid Digestion
Li, Lithium (ppm) 43.8 1.59 42.2 45.5 4-Acid Digestion
Lu, Lutetium (ppm) 0.18 0.016 0.16 0.20 4-Acid Digestion
Mg, Magnesium (wt.%) 0.694 0.032 0.670 0.718 4-Acid Digestion
Mn, Manganese (wt.%) 0.033 0.001 0.032 0.034 4-Acid Digestion
Na, Sodium (wt.%) 2.15 0.077 2.08 2.22 4-Acid Digestion
Nb, Niobium (ppm) 10.8 0.67 10.0 11.5 4-Acid Digestion
Nd, Neodymium (ppm) 29.3 3.0 25.8 32.8 4-Acid Digestion
Ni, Nickel (ppm) 18.8 0.90 17.5 20.0 4-Acid Digestion
P, Phosphorus (wt.%) 0.085 0.004 0.082 0.088 4-Acid Digestion
Pb, Lead (ppm) 41.7 2.54 38.9 44.4 4-Acid Digestion
Pr, Praseodymium (ppm) 7.33 0.79 6.41 8.25 4-Acid Digestion
Rb, Rubidium (ppm) 139 10 131 148 4-Acid Digestion
Re, Rhenium (ppm) 0.025 0.003 0.021 0.029 4-Acid Digestion
S, Sulphur (wt.%) 0.814 0.026 0.788 0.840 4-Acid Digestion
Sb, Antimony (ppm) 183 8 177 188 4-Acid Digestion
Sc, Scandium (ppm) 7.47 0.512 7.01 7.94 4-Acid Digestion
Se, Selenium (ppm) 6.16 0.570 5.46 6.85 4-Acid Digestion
Sm, Samarium (ppm) 5.75 0.62 5.01 6.50 4-Acid Digestion
Sn, Tin (ppm) 4.11 0.247 3.82 4.40 4-Acid Digestion
Sr, Strontium (ppm) 299 14 284 315 4-Acid Digestion
Ta, Tantalum (ppm) 1.00 0.10 0.92 1.09 4-Acid Digestion
Tb, Terbium (ppm) 0.64 0.062 0.58 0.70 4-Acid Digestion
Te, Tellurium (ppm) 0.39 0.05 0.32 0.47 4-Acid Digestion
Th, Thorium (ppm) 11.7 1.11 10.7 12.6 4-Acid Digestion
Ti, Titanium (wt.%) 0.313 0.009 0.298 0.328 4-Acid Digestion
Tl, Thallium (ppm) 0.79 0.034 0.73 0.84 4-Acid Digestion
Tm, Thulium (ppm) 0.18 0.03 0.15 0.21 4-Acid Digestion
U, Uranium (ppm) 3.37 0.37 2.86 3.88 4-Acid Digestion
V, Vanadium (ppm) 65 3.7 62 67 4-Acid Digestion
W, Tungsten (ppm) 9.55 0.908 8.36 10.73 4-Acid Digestion
Y, Yttrium (ppm) 13.9 1.34 12.6 15.1 4-Acid Digestion
Yb, Ytterbium (ppm) 1.13 0.13 1.01 1.24 4-Acid Digestion
Zn, Zinc (ppm) 132 4 127 137 4-Acid Digestion
Zr, Zirconium (ppm) 69 5.1 65 73 4-Acid Digestion
Ag, Silver (ppm) 1.35 0.066 1.27 1.42 Aqua Regia Digestion
Al, Aluminium (wt.%) 1.70 0.071 1.65 1.74 Aqua Regia Digestion
As, Arsenic (ppm) 14.2 0.66 13.2 15.2 Aqua Regia Digestion
B, Boron (ppm) < 10.0 IND IND IND Aqua Regia Digestion
Be, Beryllium (ppm) 1.37 0.072 1.26 1.48 Aqua Regia Digestion
Bi, Bismuth (ppm) 1.17 0.114 0.98 1.36 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.747 0.021 0.726 0.768 Aqua Regia Digestion
Cd, Cadmium (ppm) 0.31 0.04 0.27 0.35 Aqua Regia Digestion
Ce, Cerium (ppm) 27.7 4.3 24.9 30.4 Aqua Regia Digestion
Co, Cobalt (ppm) 9.53 0.278 9.14 9.92 Aqua Regia Digestion
Cr, Chromium (ppm) 45.9 1.32 44.4 47.3 Aqua Regia Digestion
Cs, Caesium (ppm) 7.08 0.319 6.72 7.45 Aqua Regia Digestion
Cu, Copper (wt.%) 0.549 0.014 0.536 0.562 Aqua Regia Digestion
Fe, Iron (wt.%) 2.83 0.066 2.76 2.90 Aqua Regia Digestion
Ga, Gallium (ppm) 7.98 0.490 7.49 8.47 Aqua Regia Digestion
Ge, Germanium (ppm) 0.088 0.011 0.071 0.105 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.33 0.024 0.30 0.36 Aqua Regia Digestion
Hg, Mercury (ppm) 0.031 0.007 0.017 0.045 Aqua Regia Digestion
In, Indium (ppm) 0.17 0.009 0.15 0.18 Aqua Regia Digestion
K, Potassium (wt.%) 0.844 0.031 0.821 0.867 Aqua Regia Digestion
La, Lanthanum (ppm) 12.8 2.1 11.7 14.0 Aqua Regia Digestion
Li, Lithium (ppm) 34.7 2.69 32.5 36.8 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.655 0.013 0.642 0.667 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.028 0.001 0.028 0.029 Aqua Regia Digestion
Mo, Molybdenum (ppm) 147 5 142 152 Aqua Regia Digestion
Na, Sodium (wt.%) 0.128 0.011 0.121 0.136 Aqua Regia Digestion
Nb, Niobium (ppm) 0.87 0.13 0.74 1.00 Aqua Regia Digestion
Ni, Nickel (ppm) 18.9 0.60 18.0 19.8 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.067 0.002 0.064 0.069 Aqua Regia Digestion
Pb, Lead (ppm) 27.6 1.67 26.4 28.9 Aqua Regia Digestion
Rb, Rubidium (ppm) 81 5.2 77 85 Aqua Regia Digestion
Re, Rhenium (ppm) 0.024 0.002 0.021 0.027 Aqua Regia Digestion
S, Sulphur (wt.%) 0.818 0.033 0.789 0.847 Aqua Regia Digestion
Sb, Antimony (ppm) 152 16 143 161 Aqua Regia Digestion
Sc, Scandium (ppm) 6.65 0.424 6.35 6.95 Aqua Regia Digestion
Se, Selenium (ppm) 5.84 0.489 5.21 6.46 Aqua Regia Digestion
Sn, Tin (ppm) 2.90 0.189 2.71 3.08 Aqua Regia Digestion
Sr, Strontium (ppm) 104 6 99 109 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.010 IND IND IND Aqua Regia Digestion
Tb, Terbium (ppm) 0.41 0.022 0.38 0.45 Aqua Regia Digestion
Te, Tellurium (ppm) 0.39 0.033 0.34 0.44 Aqua Regia Digestion
Th, Thorium (ppm) 4.99 0.62 4.43 5.56 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.216 0.008 0.208 0.224 Aqua Regia Digestion
Tl, Thallium (ppm) 0.51 0.028 0.47 0.54 Aqua Regia Digestion
U, Uranium (ppm) 2.86 0.31 2.49 3.23 Aqua Regia Digestion
V, Vanadium (ppm) 55 2.1 54 57 Aqua Regia Digestion
W, Tungsten (ppm) 6.05 0.76 5.34 6.75 Aqua Regia Digestion
Y, Yttrium (ppm) 9.47 0.389 9.09 9.84 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.70 0.009 0.69 0.72 Aqua Regia Digestion
Zn, Zinc (ppm) 128 4 124 132 Aqua Regia Digestion
Zr, Zirconium (ppm) 8.87 0.607 8.29 9.44 Aqua Regia Digestion
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