OREAS 501c

OREAS 501c 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.

Thirty commercial analytical laboratories participated in the program to characterise the elements reported in Tables 1 to 4. The following methods were employed: 

  • Gold via 25-40g fire assay with AAS (18 labs) or ICP-OES (12 labs) finish;
  • Gold via 15-50g aqua regia digestion with ICP-MS (13 labs), ICP-OES (2 labs) or AAS (6 labs) finish;
  • Four acid digestion for full elemental suite ICP-OES and ICP-MS (30 laboratories);
  • Aqua regia digestion for full elemental suite ICP-OES and ICP-MS (25 laboratories);
  • Instrumental neutron activation analysis for Au on 1g subsamples to confirm homogeneity (1 laboratory).
Analyte Certified Value 1SD 95% Confidence Limits Low 95% Confidence Limits High Method
Au, Gold (ppm) 0.221 0.007 0.219 0.224 Pb Fire Assay
Cu, Copper (wt.%) 0.276 0.008 0.273 0.278 4-Acid Digestion
Mo, Molybdenum (ppm) 97 3.0 96 98 4-Acid Digestion
Ag, Silver (ppm) 0.461 0.053 0.436 0.486 4-Acid Digestion
Al, Aluminium (wt.%) 7.49 0.331 7.36 7.61 4-Acid Digestion
As, Arsenic (ppm) 23.9 2.00 23.1 24.6 4-Acid Digestion
Ba, Barium (ppm) 1044 53 1025 1062 4-Acid Digestion
Be, Beryllium (ppm) 2.94 0.178 2.87 3.01 4-Acid Digestion
Bi, Bismuth (ppm) 0.69 0.041 0.67 0.71 4-Acid Digestion
Ca, Calcium (wt.%) 2.64 0.154 2.58 2.70 4-Acid Digestion
Cd, Cadmium (ppm) 0.18 0.03 0.16 0.19 4-Acid Digestion
Ce, Cerium (ppm) 69 5.4 66 71 4-Acid Digestion
Co, Cobalt (ppm) 15.1 0.74 14.8 15.4 4-Acid Digestion
Cr, Chromium (ppm) 80 10 76 84 4-Acid Digestion
Cs, Caesium (ppm) 11.7 0.63 11.4 11.9 4-Acid Digestion
Dy, Dysprosium (ppm) 4.63 0.451 4.34 4.93 4-Acid Digestion
Er, Erbium (ppm) 2.62 0.235 2.45 2.79 4-Acid Digestion
Fe, Iron (wt.%) 4.45 0.222 4.37 4.52 4-Acid Digestion
Ga, Gallium (ppm) 19.1 0.84 18.7 19.4 4-Acid Digestion
Gd, Gadolinium (ppm) 5.04 0.401 4.77 5.31 4-Acid Digestion
Hf, Hafnium (ppm) 2.60 0.165 2.53 2.66 4-Acid Digestion
Ho, Holmium (ppm) 0.93 0.038 0.91 0.94 4-Acid Digestion
In, Indium (ppm) 0.075 0.006 0.073 0.078 4-Acid Digestion
K, Potassium (wt.%) 3.22 0.198 3.15 3.30 4-Acid Digestion
La, Lanthanum (ppm) 35.2 2.49 34.3 36.0 4-Acid Digestion
Li, Lithium (ppm) 33.8 2.00 33.1 34.5 4-Acid Digestion
Lu, Lutetium (ppm) 0.36 0.036 0.34 0.39 4-Acid Digestion
Mg, Magnesium (wt.%) 1.51 0.091 1.47 1.54 4-Acid Digestion
Mn, Manganese (wt.%) 0.055 0.003 0.054 0.056 4-Acid Digestion
Na, Sodium (wt.%) 2.02 0.094 1.99 2.05 4-Acid Digestion
Nb, Niobium (ppm) 18.4 1.77 17.6 19.1 4-Acid Digestion
Nd, Neodymium (ppm) 30.0 3.3 27.8 32.2 4-Acid Digestion
Ni, Nickel (ppm) 60 3.6 59 61 4-Acid Digestion
P, Phosphorus (wt.%) 0.101 0.005 0.099 0.102 4-Acid Digestion
Pb, Lead (ppm) 21.5 1.42 20.9 22.0 4-Acid Digestion
Pr, Praseodymium (ppm) 7.91 0.749 7.42 8.40 4-Acid Digestion
Rb, Rubidium (ppm) 196 13 191 202 4-Acid Digestion
S, Sulphur (wt.%) 0.347 0.017 0.341 0.353 4-Acid Digestion
Sb, Antimony (ppm) 2.27 0.163 2.20 2.33 4-Acid Digestion
Sc, Scandium (ppm) 12.9 1.4 12.3 13.6 4-Acid Digestion
Se, Selenium (ppm) 2.07 0.56 1.83 2.30 4-Acid Digestion
Sm, Samarium (ppm) 5.74 0.499 5.44 6.04 4-Acid Digestion
Sn, Tin (ppm) 3.38 0.207 3.29 3.48 4-Acid Digestion
Sr, Strontium (ppm) 322 17 316 328 4-Acid Digestion
Ta, Tantalum (ppm) 1.32 0.128 1.25 1.39 4-Acid Digestion
Tb, Terbium (ppm) 0.80 0.061 0.76 0.84 4-Acid Digestion
Te, Tellurium (ppm) 0.25 0.021 0.24 0.26 4-Acid Digestion
Th, Thorium (ppm) 18.9 1.79 18.2 19.6 4-Acid Digestion
Ti, Titanium (wt.%) 0.480 0.024 0.471 0.489 4-Acid Digestion
Tl, Thallium (ppm) 0.97 0.055 0.95 1.00 4-Acid Digestion
Tm, Thulium (ppm) 0.36 0.024 0.34 0.38 4-Acid Digestion
U, Uranium (ppm) 5.13 0.54 4.92 5.34 4-Acid Digestion
V, Vanadium (ppm) 120 8 117 122 4-Acid Digestion
W, Tungsten (ppm) 4.48 0.349 4.38 4.58 4-Acid Digestion
Y, Yttrium (ppm) 24.9 1.39 24.4 25.5 4-Acid Digestion
Yb, Ytterbium (ppm) 2.42 0.25 2.30 2.55 4-Acid Digestion
Zn, Zinc (ppm) 81 4.7 79 83 4-Acid Digestion
Zr, Zirconium (ppm) 81 7.5 78 84 4-Acid Digestion
Ag, Silver (ppm) 0.444 0.027 0.429 0.458 Aqua Regia Digestion
Al, Aluminium (wt.%) 2.17 0.116 2.11 2.23 Aqua Regia Digestion
As, Arsenic (ppm) 24.3 1.54 23.7 24.8 Aqua Regia Digestion
Au, Gold (ppm) 0.214 0.009 0.210 0.217 Aqua Regia Digestion
Ba, Barium (ppm) 428 20 420 437 Aqua Regia Digestion
Be, Beryllium (ppm) 0.59 0.08 0.52 0.66 Aqua Regia Digestion
Bi, Bismuth (ppm) 0.70 0.042 0.68 0.72 Aqua Regia Digestion
Ca, Calcium (wt.%) 1.02 0.085 0.98 1.07 Aqua Regia Digestion
Ce, Cerium (ppm) 64 4.7 61 66 Aqua Regia Digestion
Co, Cobalt (ppm) 14.2 0.60 13.9 14.5 Aqua Regia Digestion
Cr, Chromium (ppm) 68 2.7 66 69 Aqua Regia Digestion
Cs, Caesium (ppm) 9.88 0.560 9.61 10.16 Aqua Regia Digestion
Cu, Copper (wt.%) 0.275 0.006 0.273 0.276 Aqua Regia Digestion
Dy, Dysprosium (ppm) 3.31 0.249 3.07 3.56 Aqua Regia Digestion
Er, Erbium (ppm) 1.74 0.24 1.43 2.05 Aqua Regia Digestion
Fe, Iron (wt.%) 4.10 0.247 4.00 4.20 Aqua Regia Digestion
Ga, Gallium (ppm) 8.56 0.94 8.12 8.99 Aqua Regia Digestion
Gd, Gadolinium (ppm) 4.02 0.381 3.67 4.37 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.40 0.038 0.38 0.42 Aqua Regia Digestion
Ho, Holmium (ppm) 0.62 0.08 0.52 0.73 Aqua Regia Digestion
In, Indium (ppm) 0.047 0.005 0.043 0.051 Aqua Regia Digestion
K, Potassium (wt.%) 1.17 0.069 1.14 1.19 Aqua Regia Digestion
La, Lanthanum (ppm) 31.9 2.36 30.9 33.0 Aqua Regia Digestion
Li, Lithium (ppm) 33.1 1.06 32.6 33.5 Aqua Regia Digestion
Mg, Magnesium (wt.%) 1.22 0.055 1.20 1.25 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.039 0.001 0.038 0.039 Aqua Regia Digestion
Mo, Molybdenum (ppm) 95 4.5 93 97 Aqua Regia Digestion
Na, Sodium (wt.%) 0.202 0.017 0.194 0.210 Aqua Regia Digestion
Ni, Nickel (ppm) 58 3.0 57 59 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.096 0.004 0.094 0.098 Aqua Regia Digestion
Pb, Lead (ppm) 8.43 0.482 8.19 8.68 Aqua Regia Digestion
Pr, Praseodymium (ppm) 6.88 0.599 6.26 7.50 Aqua Regia Digestion
Rb, Rubidium (ppm) 134 6 131 137 Aqua Regia Digestion
S, Sulphur (wt.%) 0.343 0.020 0.334 0.351 Aqua Regia Digestion
Sb, Antimony (ppm) 1.59 0.25 1.46 1.73 Aqua Regia Digestion
Sc, Scandium (ppm) 7.36 0.623 7.09 7.64 Aqua Regia Digestion
Sm, Samarium (ppm) 4.38 0.49 3.93 4.82 Aqua Regia Digestion
Sn, Tin (ppm) 2.70 0.28 2.55 2.85 Aqua Regia Digestion
Sr, Strontium (ppm) 65 9 61 69 Aqua Regia Digestion
Th, Thorium (ppm) 19.3 1.10 18.8 19.8 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.363 0.017 0.354 0.372 Aqua Regia Digestion
Tl, Thallium (ppm) 0.73 0.061 0.70 0.77 Aqua Regia Digestion
U, Uranium (ppm) 4.87 0.261 4.77 4.98 Aqua Regia Digestion
V, Vanadium (ppm) 110 4 109 112 Aqua Regia Digestion
W, Tungsten (ppm) 2.96 0.44 2.73 3.19 Aqua Regia Digestion
Zn, Zinc (ppm) 74 3.8 72 75 Aqua Regia Digestion
Zr, Zirconium (ppm) 9.34 0.577 9.03 9.66 Aqua Regia Digestion
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