OREAS 501d

OREAS 501d was prepared from a blend of porphyry copper-gold ores, barren granodiorite and a minor quantity of Cu-Mo concentrate. 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 commercial analytical laboratories participated in the program to certify the elements reported in Table 1. The following methods were employed:

  • Gold by instrumental neutron activation analysis (INAA) on 20 x 85mg subsamples to confirm homogeneity (ANSTO, Lucas Heights, Australia);
  • Gold via 25-40g fire assay with AAS finish, ICP-OES or ICP-MS finish;
  • Gold via 15-50g aqua regia digestion with ICP OES or MS finish and AAS finish;
  • Total Sulphur by infrared combustion furnace;
  • 4-Acid digestion for full elemental suite ICP-OES/MS finish;
  • Aqua regia digestion for full elemental suite ICP-OES/MS and AAS finish.
Analyte Certified Value 1SD 95% Confidence Low 95% Confidence High Method
Au, Gold (ppm) 0.232 0.011 0.228 0.235 Pb Fire Assay
Cu, Copper (wt.%) 0.272 0.009 0.268 0.276 4-Acid Digestion
Mo, Molybdenum (ppm) 95 6.9 92 98 4-Acid Digestion
Au, Gold (ppm) 0.232 0.010 0.228 0.237 Aqua Regia Digestion (sample weights 10-50g)
S, Sulphur (wt.%) 0.375 0.016 0.367 0.383 Infrared Combustion
Ag, Silver (ppm) 0.664 0.053 0.635 0.693 4-Acid Digestion
Al, Aluminium (wt.%) 7.69 0.247 7.58 7.81 4-Acid Digestion
As, Arsenic (ppm) 15.1 2.0 13.8 16.4 4-Acid Digestion
Ba, Barium (ppm) 1032 36 1015 1049 4-Acid Digestion
Be, Beryllium (ppm) 2.65 0.29 2.52 2.79 4-Acid Digestion
Bi, Bismuth (ppm) 1.26 0.14 1.19 1.32 4-Acid Digestion
Ca, Calcium (wt.%) 1.85 0.050 1.83 1.88 4-Acid Digestion
Cd, Cadmium (ppm) 0.30 0.03 0.28 0.31 4-Acid Digestion
Ce, Cerium (ppm) 73 5.6 70 76 4-Acid Digestion
Co, Cobalt (ppm) 9.57 0.636 9.23 9.91 4-Acid Digestion
Cr, Chromium (ppm) 45.4 5.5 42.8 48.0 4-Acid Digestion
Cs, Caesium (ppm) 10.7 0.93 10.2 11.2 4-Acid Digestion
Dy, Dysprosium (ppm) 3.76 0.315 3.53 3.99 4-Acid Digestion
Er, Erbium (ppm) 1.49 0.19 1.34 1.64 4-Acid Digestion
Eu, Europium (ppm) 1.44 0.101 1.33 1.55 4-Acid Digestion
Fe, Iron (wt.%) 3.37 0.123 3.31 3.43 4-Acid Digestion
Ga, Gallium (ppm) 20.8 1.09 20.2 21.3 4-Acid Digestion
Gd, Gadolinium (ppm) 5.89 0.444 5.56 6.23 4-Acid Digestion
Hf, Hafnium (ppm) 2.00 0.31 1.86 2.15 4-Acid Digestion
Ho, Holmium (ppm) 0.62 0.059 0.56 0.68 4-Acid Digestion
In, Indium (ppm) 0.086 0.007 0.082 0.089 4-Acid Digestion
K, Potassium (wt.%) 3.01 0.103 2.96 3.06 4-Acid Digestion
La, Lanthanum (ppm) 34.8 2.83 33.3 36.2 4-Acid Digestion
Li, Lithium (ppm) 51 2.8 50 53 4-Acid Digestion
Lu, Lutetium (ppm) 0.19 0.018 0.17 0.20 4-Acid Digestion
Mg, Magnesium (wt.%) 0.827 0.028 0.815 0.839 4-Acid Digestion
Mn, Manganese (wt.%) 0.037 0.001 0.037 0.038 4-Acid Digestion
Na, Sodium (wt.%) 2.07 0.056 2.05 2.10 4-Acid Digestion
Nb, Niobium (ppm) 12.2 0.52 11.9 12.4 4-Acid Digestion
Nd, Neodymium (ppm) 32.6 2.87 30.5 34.6 4-Acid Digestion
Ni, Nickel (wt.%) 0.002 0.000 0.002 0.002 4-Acid Digestion
P, Phosphorus (wt.%) 0.087 0.004 0.084 0.089 4-Acid Digestion
Pb, Lead (ppm) 25.2 0.75 24.9 25.5 4-Acid Digestion
Pr, Praseodymium (ppm) 8.37 0.804 7.79 8.95 4-Acid Digestion
Rb, Rubidium (ppm) 164 5 161 166 4-Acid Digestion
Re, Rhenium (ppm) 0.049 0.003 0.048 0.050 4-Acid Digestion
S, Sulphur (wt.%) 0.380 0.022 0.370 0.391 4-Acid Digestion
Sb, Antimony (ppm) 2.25 0.193 2.15 2.34 4-Acid Digestion
Sc, Scandium (ppm) 9.47 0.598 9.15 9.79 4-Acid Digestion
Sm, Samarium (ppm) 6.79 0.517 6.42 7.15 4-Acid Digestion
Sn, Tin (ppm) 4.86 0.282 4.73 4.99 4-Acid Digestion
Sr, Strontium (ppm) 212 7 209 215 4-Acid Digestion
Ta, Tantalum (ppm) 1.09 0.058 1.05 1.12 4-Acid Digestion
Tb, Terbium (ppm) 0.76 0.08 0.69 0.84 4-Acid Digestion
Th, Thorium (ppm) 14.0 1.13 13.4 14.6 4-Acid Digestion
Ti, Titanium (wt.%) 0.359 0.012 0.354 0.365 4-Acid Digestion
Tl, Thallium (ppm) 0.91 0.040 0.89 0.93 4-Acid Digestion
Tm, Thulium (ppm) 0.19 0.02 0.17 0.22 4-Acid Digestion
U, Uranium (ppm) 3.88 0.48 3.68 4.08 4-Acid Digestion
V, Vanadium (ppm) 71 1.3 71 72 4-Acid Digestion
W, Tungsten (ppm) 8.56 0.773 8.25 8.87 4-Acid Digestion
Y, Yttrium (ppm) 15.7 1.38 15.0 16.5 4-Acid Digestion
Yb, Ytterbium (ppm) 1.22 0.120 1.12 1.32 4-Acid Digestion
Zn, Zinc (ppm) 90 3.3 89 92 4-Acid Digestion
Zr, Zirconium (ppm) 62 9 58 66 4-Acid Digestion
Ag, Silver (ppm) 0.649 0.045 0.626 0.673 Aqua Regia Digestion
Al, Aluminium (wt.%) 1.96 0.145 1.89 2.03 Aqua Regia Digestion
As, Arsenic (ppm) 14.1 0.92 13.5 14.8 Aqua Regia Digestion
B, Boron (ppm) < 10.0 IND IND IND Aqua Regia Digestion
Ba, Barium (ppm) 468 41 445 491 Aqua Regia Digestion
Be, Beryllium (ppm) 1.46 0.17 1.38 1.54 Aqua Regia Digestion
Bi, Bismuth (ppm) 1.30 0.113 1.25 1.35 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.580 0.050 0.556 0.604 Aqua Regia Digestion
Cd, Cadmium (ppm) 0.18 0.02 0.17 0.19 Aqua Regia Digestion
Ce, Cerium (ppm) 29.1 5.4 25.8 32.5 Aqua Regia Digestion
Co, Cobalt (ppm) 9.28 0.551 9.00 9.57 Aqua Regia Digestion
Cr, Chromium (ppm) 48.5 1.57 47.8 49.2 Aqua Regia Digestion
Cs, Caesium (ppm) 8.35 0.740 7.96 8.74 Aqua Regia Digestion
Cu, Copper (wt.%) 0.270 0.006 0.268 0.272 Aqua Regia Digestion
Dy, Dysprosium (ppm) 2.31 0.179 2.11 2.51 Aqua Regia Digestion
Er, Erbium (ppm) 0.89 0.059 0.81 0.96 Aqua Regia Digestion
Eu, Europium (ppm) 0.32 0.05 0.27 0.37 Aqua Regia Digestion
Fe, Iron (wt.%) 3.24 0.150 3.17 3.31 Aqua Regia Digestion
Ga, Gallium (ppm) 9.21 0.523 8.92 9.50 Aqua Regia Digestion
Gd, Gadolinium (ppm) 3.02 0.33 2.64 3.40 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.29 0.016 0.29 0.30 Aqua Regia Digestion
Ho, Holmium (ppm) 0.39 0.05 0.33 0.45 Aqua Regia Digestion
In, Indium (ppm) 0.074 0.007 0.071 0.077 Aqua Regia Digestion
K, Potassium (wt.%) 0.938 0.065 0.907 0.969 Aqua Regia Digestion
La, Lanthanum (ppm) 13.6 2.5 12.1 15.0 Aqua Regia Digestion
Li, Lithium (ppm) 40.8 4.1 38.7 42.8 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.761 0.024 0.750 0.771 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.031 0.001 0.031 0.032 Aqua Regia Digestion
Mo, Molybdenum (ppm) 93 5.2 91 96 Aqua Regia Digestion
Na, Sodium (wt.%) 0.146 0.017 0.138 0.154 Aqua Regia Digestion
Nb, Niobium (ppm) 0.75 0.25 0.57 0.94 Aqua Regia Digestion
Ni, Nickel (wt.%) 0.002 0.000 0.002 0.002 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.066 0.003 0.065 0.068 Aqua Regia Digestion
Pb, Lead (ppm) 7.08 0.609 6.75 7.41 Aqua Regia Digestion
Pr, Praseodymium (ppm) 3.30 0.72 2.48 4.11 Aqua Regia Digestion
Pt, Platinum (ppb) < 5.00 IND IND IND Aqua Regia Digestion
Rb, Rubidium (ppm) 94 7.9 90 99 Aqua Regia Digestion
Re, Rhenium (ppm) 0.047 0.003 0.046 0.049 Aqua Regia Digestion
S, Sulphur (wt.%) 0.383 0.026 0.370 0.397 Aqua Regia Digestion
Sb, Antimony (ppm) 1.58 0.26 1.44 1.71 Aqua Regia Digestion
Sc, Scandium (ppm) 8.00 0.528 7.72 8.27 Aqua Regia Digestion
Sm, Samarium (ppm) 3.13 0.59 2.47 3.79 Aqua Regia Digestion
Sn, Tin (ppm) 3.47 0.228 3.33 3.60 Aqua Regia Digestion
Sr, Strontium (ppm) 40.8 2.72 39.4 42.2 Aqua Regia Digestion
Tb, Terbium (ppm) 0.45 0.06 0.40 0.51 Aqua Regia Digestion
Te, Tellurium (ppm) 0.20 0.03 0.19 0.21 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.265 0.013 0.258 0.271 Aqua Regia Digestion
Tl, Thallium (ppm) 0.60 0.036 0.58 0.62 Aqua Regia Digestion
Tm, Thulium (ppm) 0.13 0.02 0.10 0.16 Aqua Regia Digestion
U, Uranium (ppm) 3.32 0.249 3.22 3.42 Aqua Regia Digestion
V, Vanadium (ppm) 65 3.6 63 67 Aqua Regia Digestion
W, Tungsten (ppm) 5.36 0.450 5.10 5.62 Aqua Regia Digestion
Y, Yttrium (ppm) 10.2 0.72 9.9 10.6 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.75 0.047 0.70 0.80 Aqua Regia Digestion
Zn, Zinc (ppm) 86 2.6 84 87 Aqua Regia Digestion
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