OREAS 506

OREAS 506 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 the 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 seven commercial analytical laboratories participated in the program to certify the elements reported in Table 1. The following methods were employed:

  • Gold via 15-50g fire assay with AAS finish (14 laboratories) and ICP-OES (12 laboratories) finish;
  • Gold via 15-50g aqua regia digestion with ICP-MS finish (11 laboratories), AAS (4 laboratories) and ICP-OES (1 laboratory) finish;
  • Aqua regia digestion for full elemental suite ICP-OES/MS and AAS finish (up to 26 laboratories depending on the element);
  • 4-Acid digestion for full elemental suite ICP-OES/MS finish (up to 25 laboratories depending on the element);
  • Gold by instrumental neutron activation analysis (INAA) on 20 x 85mg subsamples to confirm homogeneity (1 laboratory only: ANSTO, Lucas Heights, Australia);
  • Major and trace elements determined by borate fusion XRF (Al2O3 to TiO2), laser ablation with ICP-MS (Ag to Zr), LOI at 1000°C and C+S by infrared combustion furnace (1 laboratory only: Bureau Veritas Geoanalytical, Perth, Australia).
Analyte Certified Value 1SD 95% Confidence Low 95% Confidence High Method
Au, Gold (ppm) 0.364 0.010 0.360 0.367 Pb Fire Assay
Cu, Copper (wt.%) 0.444 0.010 0.440 0.447 4-Acid Digestion
Mo, Molybdenum (ppm) 87 3.6 85 88 4-Acid Digestion
Au, Gold (ppm) 0.361 0.013 0.355 0.366 Aqua Regia Digestion (sample weights 10-50g)
Ag, Silver (ppm) 1.88 0.075 1.85 1.91 4-Acid Digestion
Al, Aluminium (wt.%) 7.57 0.438 7.39 7.74 4-Acid Digestion
As, Arsenic (ppm) 37.7 2.28 36.8 38.5 4-Acid Digestion
Ba, Barium (ppm) 1022 39 1006 1037 4-Acid Digestion
Be, Beryllium (ppm) 2.40 0.225 2.30 2.49 4-Acid Digestion
Bi, Bismuth (ppm) 2.75 0.154 2.68 2.81 4-Acid Digestion
Ca, Calcium (wt.%) 1.72 0.085 1.68 1.75 4-Acid Digestion
Cd, Cadmium (ppm) 0.31 0.030 0.30 0.33 4-Acid Digestion
Ce, Cerium (ppm) 67 4.3 65 69 4-Acid Digestion
Co, Cobalt (ppm) 7.37 0.253 7.27 7.47 4-Acid Digestion
Cr, Chromium (ppm) 36.5 7.0 33.6 39.5 4-Acid Digestion
Cs, Caesium (ppm) 9.57 0.416 9.37 9.77 4-Acid Digestion
Dy, Dysprosium (ppm) 3.53 0.114 3.44 3.61 4-Acid Digestion
Er, Erbium (ppm) 1.40 0.113 1.31 1.49 4-Acid Digestion
Eu, Europium (ppm) 1.22 0.17 1.06 1.39 4-Acid Digestion
Fe, Iron (wt.%) 2.79 0.077 2.76 2.82 4-Acid Digestion
Ga, Gallium (ppm) 19.5 0.85 19.1 19.8 4-Acid Digestion
Gd, Gadolinium (ppm) 5.52 0.410 5.17 5.87 4-Acid Digestion
Hf, Hafnium (ppm) 2.08 0.207 1.99 2.17 4-Acid Digestion
Ho, Holmium (ppm) 0.59 0.016 0.58 0.61 4-Acid Digestion
In, Indium (ppm) 0.10 0.006 0.10 0.10 4-Acid Digestion
K, Potassium (wt.%) 3.32 0.133 3.27 3.37 4-Acid Digestion
La, Lanthanum (ppm) 31.5 2.62 30.4 32.6 4-Acid Digestion
Li, Lithium (ppm) 44.1 2.69 42.8 45.4 4-Acid Digestion
Lu, Lutetium (ppm) 0.18 0.013 0.17 0.19 4-Acid Digestion
Mg, Magnesium (wt.%) 0.703 0.028 0.691 0.714 4-Acid Digestion
Mn, Manganese (wt.%) 0.033 0.001 0.033 0.034 4-Acid Digestion
Na, Sodium (wt.%) 2.20 0.072 2.17 2.22 4-Acid Digestion
Nb, Niobium (ppm) 11.8 0.53 11.5 12.0 4-Acid Digestion
Nd, Neodymium (ppm) 30.3 1.53 29.0 31.6 4-Acid Digestion
Ni, Nickel (ppm) 14.5 0.72 14.2 14.8 4-Acid Digestion
P, Phosphorus (wt.%) 0.087 0.003 0.086 0.088 4-Acid Digestion
Pb, Lead (ppm) 27.7 1.99 26.8 28.7 4-Acid Digestion
Pr, Praseodymium (ppm) 8.02 0.521 7.55 8.48 4-Acid Digestion
Rb, Rubidium (ppm) 151 7 147 154 4-Acid Digestion
Re, Rhenium (ppb) 72 7 69 75 4-Acid Digestion
S, Sulphur (wt.%) 0.589 0.022 0.580 0.597 4-Acid Digestion
Sb, Antimony (ppm) 4.27 0.171 4.21 4.33 4-Acid Digestion
Sc, Scandium (ppm) 7.94 0.392 7.76 8.11 4-Acid Digestion
Se, Selenium (ppm) 5.19 0.57 5.00 5.37 4-Acid Digestion
Sm, Samarium (ppm) 6.35 0.371 6.03 6.67 4-Acid Digestion
Sn, Tin (ppm) 4.74 0.223 4.63 4.85 4-Acid Digestion
Sr, Strontium (ppm) 279 10 275 283 4-Acid Digestion
Ta, Tantalum (ppm) 1.00 0.10 0.94 1.05 4-Acid Digestion
Tb, Terbium (ppm) 0.74 0.038 0.71 0.77 4-Acid Digestion
Te, Tellurium (ppm) 0.63 0.049 0.61 0.66 4-Acid Digestion
Th, Thorium (ppm) 12.5 1.08 12.0 13.0 4-Acid Digestion
Ti, Titanium (wt.%) 0.330 0.013 0.325 0.336 4-Acid Digestion
Tl, Thallium (ppm) 0.85 0.040 0.83 0.86 4-Acid Digestion
Tm, Thulium (ppm) 0.19 0.014 0.18 0.21 4-Acid Digestion
U, Uranium (ppm) 3.51 0.342 3.40 3.62 4-Acid Digestion
V, Vanadium (ppm) 67 2.4 66 68 4-Acid Digestion
W, Tungsten (ppm) 8.11 0.704 7.87 8.35 4-Acid Digestion
Y, Yttrium (ppm) 14.6 1.17 14.1 15.1 4-Acid Digestion
Yb, Ytterbium (ppm) 1.16 0.13 1.07 1.24 4-Acid Digestion
Zn, Zinc (ppm) 91 3.9 89 93 4-Acid Digestion
Zr, Zirconium (ppm) 69 4.7 67 71 4-Acid Digestion
Ag, Silver (ppm) 1.82 0.089 1.78 1.86 Aqua Regia Digestion
Al, Aluminium (wt.%) 1.80 0.106 1.76 1.85 Aqua Regia Digestion
As, Arsenic (ppm) 36.8 1.74 36.2 37.4 Aqua Regia Digestion
Ba, Barium (ppm) 506 23 495 517 Aqua Regia Digestion
Be, Beryllium (ppm) 1.34 0.124 1.29 1.40 Aqua Regia Digestion
Bi, Bismuth (ppm) 2.79 0.155 2.72 2.86 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.712 0.036 0.697 0.727 Aqua Regia Digestion
Cd, Cadmium (ppm) 0.23 0.03 0.22 0.25 Aqua Regia Digestion
Ce, Cerium (ppm) 33.0 6.5 29.6 36.3 Aqua Regia Digestion
Co, Cobalt (ppm) 7.16 0.343 7.00 7.33 Aqua Regia Digestion
Cr, Chromium (ppm) 45.3 2.83 44.2 46.4 Aqua Regia Digestion
Cs, Caesium (ppm) 7.82 0.155 7.75 7.90 Aqua Regia Digestion
Cu, Copper (wt.%) 0.441 0.012 0.437 0.446 Aqua Regia Digestion
Dy, Dysprosium (ppm) 2.43 0.30 2.17 2.68 Aqua Regia Digestion
Er, Erbium (ppm) 0.96 0.077 0.90 1.03 Aqua Regia Digestion
Eu, Europium (ppm) 0.32 0.015 0.31 0.34 Aqua Regia Digestion
Fe, Iron (wt.%) 2.73 0.088 2.69 2.76 Aqua Regia Digestion
Ga, Gallium (ppm) 8.40 0.722 8.06 8.74 Aqua Regia Digestion
Gd, Gadolinium (ppm) 3.38 0.86 2.63 4.14 Aqua Regia Digestion
Ge, Germanium (ppm) 0.10 0.02 0.08 0.13 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.31 0.019 0.30 0.32 Aqua Regia Digestion
Ho, Holmium (ppm) 0.38 0.037 0.35 0.41 Aqua Regia Digestion
In, Indium (ppm) 0.097 0.006 0.094 0.101 Aqua Regia Digestion
K, Potassium (wt.%) 0.937 0.037 0.922 0.952 Aqua Regia Digestion
La, Lanthanum (ppm) 15.0 1.9 14.1 16.0 Aqua Regia Digestion
Li, Lithium (ppm) 37.3 2.62 36.1 38.5 Aqua Regia Digestion
Lu, Lutetium (ppm) 0.10 0.005 0.10 0.11 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.671 0.026 0.661 0.682 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.030 0.001 0.029 0.030 Aqua Regia Digestion
Mo, Molybdenum (ppm) 83 2.8 82 84 Aqua Regia Digestion
Na, Sodium (wt.%) 0.161 0.018 0.152 0.169 Aqua Regia Digestion
Nb, Niobium (ppm) 0.87 0.18 0.75 0.99 Aqua Regia Digestion
Nd, Neodymium (ppm) 18.1 4.1 13.5 22.7 Aqua Regia Digestion
Ni, Nickel (ppm) 14.5 0.59 14.2 14.7 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.069 0.004 0.067 0.070 Aqua Regia Digestion
Pb, Lead (ppm) 11.4 0.86 11.1 11.7 Aqua Regia Digestion
Rb, Rubidium (ppm) 91 4.5 88 93 Aqua Regia Digestion
Re, Rhenium (ppb) 70 5 68 72 Aqua Regia Digestion
S, Sulphur (wt.%) 0.586 0.018 0.579 0.593 Aqua Regia Digestion
Sb, Antimony (ppm) 3.08 0.37 2.89 3.27 Aqua Regia Digestion
Sc, Scandium (ppm) 7.36 0.270 7.25 7.48 Aqua Regia Digestion
Se, Selenium (ppm) 4.80 0.65 4.50 5.09 Aqua Regia Digestion
Sm, Samarium (ppm) 3.51 0.99 2.63 4.39 Aqua Regia Digestion
Sn, Tin (ppm) 3.50 0.150 3.42 3.57 Aqua Regia Digestion
Sr, Strontium (ppm) 98 4.9 95 100 Aqua Regia Digestion
Tb, Terbium (ppm) 0.49 0.08 0.43 0.54 Aqua Regia Digestion
Te, Tellurium (ppm) 0.60 0.041 0.58 0.62 Aqua Regia Digestion
Th, Thorium (ppm) 6.01 0.61 5.63 6.39 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.237 0.010 0.232 0.241 Aqua Regia Digestion
Tl, Thallium (ppm) 0.58 0.044 0.56 0.60 Aqua Regia Digestion
Tm, Thulium (ppm) 0.12 0.005 0.12 0.13 Aqua Regia Digestion
U, Uranium (ppm) 2.95 0.180 2.88 3.02 Aqua Regia Digestion
V, Vanadium (ppm) 58 3.0 57 59 Aqua Regia Digestion
W, Tungsten (ppm) 5.42 0.376 5.23 5.62 Aqua Regia Digestion
Y, Yttrium (ppm) 10.4 0.41 10.2 10.6 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.73 0.043 0.69 0.76 Aqua Regia Digestion
Zn, Zinc (ppm) 86 4.3 84 88 Aqua Regia Digestion
Zr, Zirconium (ppm) 8.20 0.721 7.85 8.54 Aqua Regia Digestion
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