OREAS 503d

OREAS 503d 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 Ridgeway underground mine located in the Cadia Valley Operations (CVO) situated in central western New South Wales, Australia. The barren I-type hornblende-bearing granodiorite was sourced from the Late Devonian Lysterfield granodiorite complex located in eastern 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 Limits Low 95% Confidence Limits High Method
Au, Gold (ppm) 0.666 0.015 0.661 0.672 Pb Fire Assay
Cu, Copper (wt.%) 0.524 0.010 0.521 0.527 4-Acid Digestion
Mo, Molybdenum (ppm) 348 10 344 352 4-Acid Digestion
Au, Gold (ppm) 0.658 0.025 0.646 0.669 Aqua Regia Digestion (sample weights 10-50g)
Ag, Silver (ppm) 1.34 0.066 1.31 1.37 4-Acid Digestion
Al, Aluminium (wt.%) 7.50 0.281 7.39 7.61 4-Acid Digestion
As, Arsenic (ppm) 87 5.8 85 89 4-Acid Digestion
Ba, Barium (ppm) 1001 34 987 1015 4-Acid Digestion
Be, Beryllium (ppm) 2.93 0.226 2.83 3.03 4-Acid Digestion
Bi, Bismuth (ppm) 1.41 0.081 1.37 1.44 4-Acid Digestion
Ca, Calcium (wt.%) 2.64 0.107 2.60 2.68 4-Acid Digestion
Cd, Cadmium (ppm) 0.22 0.04 0.19 0.25 4-Acid Digestion
Ce, Cerium (ppm) 68 4.6 66 70 4-Acid Digestion
Co, Cobalt (ppm) 16.7 0.77 16.3 17.1 4-Acid Digestion
Cr, Chromium (ppm) 64 8 60 67 4-Acid Digestion
Cs, Caesium (ppm) 11.2 0.55 10.9 11.4 4-Acid Digestion
Dy, Dysprosium (ppm) 4.63 0.232 4.48 4.79 4-Acid Digestion
Er, Erbium (ppm) 2.66 0.131 2.60 2.71 4-Acid Digestion
Eu, Europium (ppm) 1.29 0.16 1.15 1.44 4-Acid Digestion
Fe, Iron (wt.%) 4.88 0.182 4.80 4.95 4-Acid Digestion
Ga, Gallium (ppm) 18.5 0.56 18.3 18.7 4-Acid Digestion
Gd, Gadolinium (ppm) 5.18 0.359 4.92 5.44 4-Acid Digestion
Hf, Hafnium (ppm) 2.72 0.198 2.63 2.81 4-Acid Digestion
Ho, Holmium (ppm) 0.92 0.052 0.88 0.96 4-Acid Digestion
In, Indium (ppm) 0.094 0.009 0.091 0.097 4-Acid Digestion
K, Potassium (wt.%) 3.13 0.131 3.08 3.18 4-Acid Digestion
La, Lanthanum (ppm) 34.3 2.19 33.3 35.2 4-Acid Digestion
Li, Lithium (ppm) 29.3 1.45 28.7 30.0 4-Acid Digestion
Lu, Lutetium (ppm) 0.36 0.014 0.35 0.37 4-Acid Digestion
Mg, Magnesium (wt.%) 1.41 0.049 1.39 1.43 4-Acid Digestion
Mn, Manganese (wt.%) 0.053 0.002 0.052 0.054 4-Acid Digestion
Na, Sodium (wt.%) 2.04 0.062 2.01 2.06 4-Acid Digestion
Nb, Niobium (ppm) 20.1 0.86 19.7 20.4 4-Acid Digestion
Nd, Neodymium (ppm) 29.5 1.24 28.6 30.4 4-Acid Digestion
Ni, Nickel (ppm) 33.5 1.68 32.9 34.2 4-Acid Digestion
P, Phosphorus (wt.%) 0.108 0.004 0.106 0.110 4-Acid Digestion
Pb, Lead (ppm) 20.6 1.77 19.8 21.4 4-Acid Digestion
Pr, Praseodymium (ppm) 7.96 0.498 7.51 8.41 4-Acid Digestion
Rb, Rubidium (ppm) 181 8 177 185 4-Acid Digestion
Re, Rhenium (ppb) 246 13 241 252 4-Acid Digestion
S, Sulphur (wt.%) 0.798 0.027 0.788 0.807 4-Acid Digestion
Sb, Antimony (ppm) 3.49 0.187 3.40 3.57 4-Acid Digestion
Sc, Scandium (ppm) 12.5 0.54 12.2 12.7 4-Acid Digestion
Se, Selenium (ppm) 3.29 0.320 3.03 3.56 4-Acid Digestion
Sm, Samarium (ppm) 5.85 0.227 5.69 6.01 4-Acid Digestion
Sn, Tin (ppm) 3.47 0.170 3.39 3.55 4-Acid Digestion
Sr, Strontium (ppm) 363 13 358 368 4-Acid Digestion
Ta, Tantalum (ppm) 1.46 0.121 1.39 1.52 4-Acid Digestion
Tb, Terbium (ppm) 0.79 0.031 0.77 0.81 4-Acid Digestion
Te, Tellurium (ppm) 0.33 0.04 0.30 0.35 4-Acid Digestion
Th, Thorium (ppm) 17.0 0.81 16.7 17.4 4-Acid Digestion
Ti, Titanium (wt.%) 0.486 0.020 0.478 0.494 4-Acid Digestion
Tl, Thallium (ppm) 0.92 0.037 0.91 0.94 4-Acid Digestion
Tm, Thulium (ppm) 0.36 0.04 0.33 0.39 4-Acid Digestion
U, Uranium (ppm) 4.63 0.351 4.48 4.78 4-Acid Digestion
V, Vanadium (ppm) 117 4 116 118 4-Acid Digestion
W, Tungsten (ppm) 3.47 0.286 3.39 3.55 4-Acid Digestion
Y, Yttrium (ppm) 23.9 1.34 23.4 24.5 4-Acid Digestion
Yb, Ytterbium (ppm) 2.32 0.129 2.24 2.41 4-Acid Digestion
Zn, Zinc (ppm) 75 4.4 73 77 4-Acid Digestion
Zr, Zirconium (ppm) 89 7.6 85 92 4-Acid Digestion
Ag, Silver (ppm) 1.32 0.110 1.27 1.37 Aqua Regia Digestion
Al, Aluminium (wt.%) 2.08 0.117 2.03 2.13 Aqua Regia Digestion
As, Arsenic (ppm) 87 4.6 85 88 Aqua Regia Digestion
Ba, Barium (ppm) 361 23 350 372 Aqua Regia Digestion
Be, Beryllium (ppm) 0.60 0.08 0.56 0.64 Aqua Regia Digestion
Bi, Bismuth (ppm) 1.42 0.052 1.39 1.44 Aqua Regia Digestion
Ca, Calcium (wt.%) 1.19 0.079 1.16 1.22 Aqua Regia Digestion
Ce, Cerium (ppm) 62 4.3 60 64 Aqua Regia Digestion
Co, Cobalt (ppm) 15.9 0.59 15.6 16.2 Aqua Regia Digestion
Cr, Chromium (ppm) 66 3.8 65 68 Aqua Regia Digestion
Cs, Caesium (ppm) 9.28 0.516 9.01 9.55 Aqua Regia Digestion
Cu, Copper (wt.%) 0.522 0.011 0.518 0.526 Aqua Regia Digestion
Dy, Dysprosium (ppm) 3.17 0.187 3.01 3.32 Aqua Regia Digestion
Er, Erbium (ppm) 1.70 0.124 1.59 1.81 Aqua Regia Digestion
Eu, Europium (ppm) 0.45 0.029 0.42 0.48 Aqua Regia Digestion
Fe, Iron (wt.%) 4.58 0.175 4.51 4.65 Aqua Regia Digestion
Ga, Gallium (ppm) 8.70 0.542 8.41 8.99 Aqua Regia Digestion
Gd, Gadolinium (ppm) 3.91 0.129 3.79 4.04 Aqua Regia Digestion
Ge, Germanium (ppm) 0.15 0.03 0.12 0.19 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.48 0.029 0.47 0.50 Aqua Regia Digestion
Ho, Holmium (ppm) 0.60 0.044 0.56 0.64 Aqua Regia Digestion
In, Indium (ppm) 0.074 0.005 0.072 0.075 Aqua Regia Digestion
K, Potassium (wt.%) 1.06 0.038 1.05 1.08 Aqua Regia Digestion
La, Lanthanum (ppm) 30.5 1.63 29.8 31.2 Aqua Regia Digestion
Li, Lithium (ppm) 27.9 3.1 26.5 29.3 Aqua Regia Digestion
Lu, Lutetium (ppm) 0.21 0.008 0.21 0.22 Aqua Regia Digestion
Mg, Magnesium (wt.%) 1.21 0.051 1.19 1.23 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.041 0.001 0.041 0.042 Aqua Regia Digestion
Mo, Molybdenum (ppm) 342 15 337 348 Aqua Regia Digestion
Na, Sodium (wt.%) 0.209 0.027 0.197 0.221 Aqua Regia Digestion
Nb, Niobium (ppm) 1.21 0.24 1.06 1.36 Aqua Regia Digestion
Nd, Neodymium (ppm) 25.4 1.33 24.3 26.6 Aqua Regia Digestion
Ni, Nickel (ppm) 31.2 1.36 30.7 31.7 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.105 0.005 0.103 0.108 Aqua Regia Digestion
Pb, Lead (ppm) 8.39 0.602 8.13 8.65 Aqua Regia Digestion
Pr, Praseodymium (ppm) 6.91 0.333 6.63 7.19 Aqua Regia Digestion
Rb, Rubidium (ppm) 120 5 117 122 Aqua Regia Digestion
Re, Rhenium (ppb) 239 9 234 243 Aqua Regia Digestion
S, Sulphur (wt.%) 0.798 0.037 0.783 0.813 Aqua Regia Digestion
Sb, Antimony (ppm) 2.36 0.28 2.22 2.50 Aqua Regia Digestion
Sc, Scandium (ppm) 7.18 0.524 6.92 7.43 Aqua Regia Digestion
Se, Selenium (ppm) 3.04 0.46 2.71 3.36 Aqua Regia Digestion
Sm, Samarium (ppm) 4.54 0.357 4.23 4.85 Aqua Regia Digestion
Sn, Tin (ppm) 2.51 0.136 2.44 2.59 Aqua Regia Digestion
Sr, Strontium (ppm) 88 11 84 93 Aqua Regia Digestion
Tb, Terbium (ppm) 0.57 0.035 0.54 0.59 Aqua Regia Digestion
Te, Tellurium (ppm) 0.30 0.03 0.29 0.32 Aqua Regia Digestion
Th, Thorium (ppm) 17.4 0.56 17.1 17.6 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.318 0.019 0.309 0.326 Aqua Regia Digestion
Tl, Thallium (ppm) 0.66 0.07 0.63 0.69 Aqua Regia Digestion
Tm, Thulium (ppm) 0.22 0.021 0.20 0.24 Aqua Regia Digestion
U, Uranium (ppm) 4.35 0.283 4.22 4.49 Aqua Regia Digestion
V, Vanadium (ppm) 104 5 102 107 Aqua Regia Digestion
W, Tungsten (ppm) 1.91 0.29 1.76 2.06 Aqua Regia Digestion
Y, Yttrium (ppm) 16.9 1.00 16.4 17.3 Aqua Regia Digestion
Yb, Ytterbium (ppm) 1.47 0.065 1.43 1.51 Aqua Regia Digestion
Zn, Zinc (ppm) 67 4.8 65 69 Aqua Regia Digestion
Zr, Zirconium (ppm) 12.2 0.89 11.7 12.7 Aqua Regia Digestion
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