OREAS 153c

OREAS 153c is a porphyry Cu-Au certified reference material prepared from a blend of ores, barren granodiorite and minor additions of copper and molybdenum concentrates. The ores were predominantly sourced from the Waisoi district, Viti Levu, Fiji and this was blended with lesser quantities of other porphyry ores from Chile and Australia. Copper mineralisation in the Namosi district is accompanied by stockwork quartz veinlets and is characterised by bornite-chalcopyrite-pyrite assemblages formed under a high sulphidation environment. The barren granodiorite was sourced from the mafic, S-Type, Late Devonian Bulla Granodiorite complex located in northern Melbourne, Australia. Thirty-one commercial analytical laboratories participated in the program to certify the elements reported below.

  • Gold by fire assay (15-50g charge weight) with ICP-OES, ICP-MS or AAS finish
  • Gold by aqua regia digestion (10-50g sample weight) with ICP-OES, ICP-MS or AAS finish
  • Full ICP-OES and ICP-MS elemental suites by 4-acid (HNO3-HF-HClO4-HCl) digestion
  • Full ICP-OES and ICP-MS elemental suites by aqua regia digestion

Instrumental neutron activation analysis for Au on 20 x 85mg subsamples was also undertaken at ANSTO, Lucas Heights to confirm homogeneity.

Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
Cu, Copper (wt.%) 0.712 0.020 0.696 0.729 4-Acid Digestion
Au, Gold (ppb) 327 14.3 322 332 Pb Fire Assay
Mo, Molybdenum (ppm) 176 9 169 182 4-Acid Digestion
Au, Gold (ppb) 321 11.2 316 325 Aqua Regia Digestion (sample weights 10-50g)
Ag, Silver (ppm) 1.77 0.074 1.67 1.87 4-Acid Digestion
Al, Aluminium (wt.%) 7.48 0.307 7.28 7.68 4-Acid Digestion
As, Arsenic (ppm) 40.6 2.30 38.6 42.6 4-Acid Digestion
Ba, Barium (ppm) 782 37 754 810 4-Acid Digestion
Be, Beryllium (ppm) 2.01 0.144 1.89 2.13 4-Acid Digestion
Bi, Bismuth (ppm) 2.35 0.141 2.17 2.53 4-Acid Digestion
Ca, Calcium (wt.%) 1.57 0.059 1.52 1.61 4-Acid Digestion
Cd, Cadmium (ppm) 1.04 0.074 0.97 1.11 4-Acid Digestion
Ce, Cerium (ppm) 56 6 52 61 4-Acid Digestion
Co, Cobalt (ppm) 14.6 1.05 13.9 15.2 4-Acid Digestion
Cr, Chromium (ppm) 36.5 3.06 34.3 38.6 4-Acid Digestion
Cs, Caesium (ppm) 7.96 0.467 7.52 8.40 4-Acid Digestion
Dy, Dysprosium (ppm) 2.98 0.282 2.64 3.32 4-Acid Digestion
Er, Erbium (ppm) 1.26 0.117 1.12 1.41 4-Acid Digestion
Eu, Europium (ppm) 1.20 0.049 1.10 1.29 4-Acid Digestion
Fe, Iron (wt.%) 3.15 0.118 3.07 3.23 4-Acid Digestion
Ga, Gallium (ppm) 19.7 1.09 18.8 20.5 4-Acid Digestion
Gd, Gadolinium (ppm) 4.53 0.47 3.97 5.09 4-Acid Digestion
Hf, Hafnium (ppm) 1.67 0.130 1.54 1.80 4-Acid Digestion
Ho, Holmium (ppm) 0.49 0.08 0.38 0.60 4-Acid Digestion
In, Indium (ppm) 0.57 0.033 0.52 0.61 4-Acid Digestion
K, Potassium (wt.%) 2.68 0.070 2.61 2.75 4-Acid Digestion
La, Lanthanum (ppm) 27.2 3.5 24.7 29.7 4-Acid Digestion
Li, Lithium (ppm) 38.8 1.91 37.4 40.2 4-Acid Digestion
Lu, Lutetium (ppm) 0.17 0.013 0.14 0.20 4-Acid Digestion
Mg, Magnesium (wt.%) 0.786 0.025 0.764 0.808 4-Acid Digestion
Mn, Manganese (wt.%) 0.031 0.001 0.030 0.032 4-Acid Digestion
Na, Sodium (wt.%) 2.32 0.055 2.26 2.39 4-Acid Digestion
Nb, Niobium (ppm) 9.65 0.859 9.05 10.26 4-Acid Digestion
Nd, Neodymium (ppm) 23.9 2.8 20.1 27.6 4-Acid Digestion
Ni, Nickel (ppm) 15.3 0.58 14.6 16.0 4-Acid Digestion
P, Phosphorus (wt.%) 0.077 0.003 0.074 0.079 4-Acid Digestion
Pb, Lead (ppm) 92 6.0 88 96 4-Acid Digestion
Pr, Praseodymium (ppm) 6.57 0.529 5.83 7.32 4-Acid Digestion
Rb, Rubidium (ppm) 129 9 120 137 4-Acid Digestion
Re, Rhenium (ppm) 0.056 0.005 0.050 0.063 4-Acid Digestion
S, Sulphur (wt.%) 1.05 0.042 1.02 1.09 4-Acid Digestion
Sb, Antimony (ppm) 2.90 0.162 2.75 3.05 4-Acid Digestion
Sc, Scandium (ppm) 8.11 0.512 7.70 8.52 4-Acid Digestion
Se, Selenium (ppm) 8.59 1.35 7.19 9.98 4-Acid Digestion
Sm, Samarium (ppm) 5.49 0.366 4.94 6.04 4-Acid Digestion
Sn, Tin (ppm) 4.23 0.408 3.87 4.59 4-Acid Digestion
Sr, Strontium (ppm) 248 14 239 257 4-Acid Digestion
Ta, Tantalum (ppm) 0.85 0.068 0.79 0.91 4-Acid Digestion
Tb, Terbium (ppm) 0.60 0.07 0.51 0.69 4-Acid Digestion
Te, Tellurium (ppm) 1.13 0.108 0.99 1.27 4-Acid Digestion
Th, Thorium (ppm) 10.1 0.96 9.3 11.0 4-Acid Digestion
Ti, Titanium (wt.%) 0.299 0.011 0.289 0.309 4-Acid Digestion
Tl, Thallium (ppm) 0.71 0.046 0.67 0.76 4-Acid Digestion
Tm, Thulium (ppm) 0.17 0.02 0.14 0.20 4-Acid Digestion
U, Uranium (ppm) 2.88 0.214 2.50 3.26 4-Acid Digestion
V, Vanadium (ppm) 82 2.8 79 84 4-Acid Digestion
W, Tungsten (ppm) 8.54 0.811 7.49 9.60 4-Acid Digestion
Y, Yttrium (ppm) 13.3 1.21 12.4 14.2 4-Acid Digestion
Yb, Ytterbium (ppm) 1.08 0.068 0.94 1.22 4-Acid Digestion
Zn, Zinc (ppm) 359 15 347 370 4-Acid Digestion
Zr, Zirconium (ppm) 55 3.7 52 58 4-Acid Digestion
Ag, Silver (ppm) 1.76 0.088 1.70 1.82 Aqua Regia Digestion
Al, Aluminium (wt.%) 1.73 0.051 1.68 1.78 Aqua Regia Digestion
As, Arsenic (ppm) 39.1 2.04 37.4 40.8 Aqua Regia Digestion
B, Boron (ppm) < 10.0 IND IND IND Aqua Regia Digestion
Ba, Barium (ppm) 341 36 319 362 Aqua Regia Digestion
Be, Beryllium (ppm) 1.16 0.077 1.09 1.24 Aqua Regia Digestion
Bi, Bismuth (ppm) 2.40 0.121 2.26 2.55 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.619 0.029 0.598 0.639 Aqua Regia Digestion
Cd, Cadmium (ppm) 0.95 0.083 0.89 1.01 Aqua Regia Digestion
Ce, Cerium (ppm) 26.1 1.86 23.9 28.3 Aqua Regia Digestion
Co, Cobalt (ppm) 14.5 1.18 13.8 15.1 Aqua Regia Digestion
Cr, Chromium (ppm) 41.7 1.79 40.3 43.1 Aqua Regia Digestion
Cs, Caesium (ppm) 6.41 0.367 6.10 6.72 Aqua Regia Digestion
Cu, Copper (wt.%) 0.711 0.018 0.696 0.727 Aqua Regia Digestion
Fe, Iron (wt.%) 3.07 0.113 3.00 3.15 Aqua Regia Digestion
Ga, Gallium (ppm) 8.06 0.539 7.70 8.42 Aqua Regia Digestion
Ge, Germanium (ppm) 0.11 0.02 0.09 0.13 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.27 0.025 0.25 0.29 Aqua Regia Digestion
Hg, Mercury (ppm) 0.057 0.011 0.042 0.072 Aqua Regia Digestion
In, Indium (ppm) 0.55 0.025 0.52 0.57 Aqua Regia Digestion
K, Potassium (wt.%) 0.760 0.039 0.735 0.786 Aqua Regia Digestion
La, Lanthanum (ppm) 12.4 0.87 11.4 13.4 Aqua Regia Digestion
Li, Lithium (ppm) 31.1 1.68 30.0 32.3 Aqua Regia Digestion
Lu, Lutetium (ppm) 0.095 0.013 0.075 0.115 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.714 0.030 0.690 0.737 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.027 0.001 0.026 0.028 Aqua Regia Digestion
Mo, Molybdenum (ppm) 171 8 166 176 Aqua Regia Digestion
Na, Sodium (wt.%) 0.138 0.013 0.128 0.149 Aqua Regia Digestion
Ni, Nickel (ppm) 14.3 0.82 13.7 15.0 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.060 0.002 0.058 0.062 Aqua Regia Digestion
Pb, Lead (ppm) 79 4.4 77 82 Aqua Regia Digestion
Rb, Rubidium (ppm) 70 2.8 67 73 Aqua Regia Digestion
Re, Rhenium (ppm) 0.057 0.003 0.051 0.062 Aqua Regia Digestion
S, Sulphur (wt.%) 1.06 0.040 1.02 1.09 Aqua Regia Digestion
Sb, Antimony (ppm) 2.07 0.28 1.89 2.25 Aqua Regia Digestion
Sc, Scandium (ppm) 6.64 0.462 6.32 6.96 Aqua Regia Digestion
Se, Selenium (ppm) 8.55 0.736 7.91 9.19 Aqua Regia Digestion
Sn, Tin (ppm) 2.95 0.169 2.79 3.11 Aqua Regia Digestion
Sr, Strontium (ppm) 63 3.7 60 65 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.010 IND IND IND Aqua Regia Digestion
Tb, Terbium (ppm) 0.43 0.06 0.34 0.51 Aqua Regia Digestion
Te, Tellurium (ppm) 1.15 0.112 1.05 1.25 Aqua Regia Digestion
Th, Thorium (ppm) 4.67 0.58 4.21 5.13 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.193 0.012 0.185 0.201 Aqua Regia Digestion
Tl, Thallium (ppm) 0.47 0.026 0.45 0.49 Aqua Regia Digestion
U, Uranium (ppm) 2.42 0.217 2.19 2.65 Aqua Regia Digestion
V, Vanadium (ppm) 62 2.2 60 64 Aqua Regia Digestion
W, Tungsten (ppm) 5.36 0.79 4.74 5.98 Aqua Regia Digestion
Y, Yttrium (ppm) 9.65 0.443 9.13 10.17 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.70 0.025 0.67 0.73 Aqua Regia Digestion
Zn, Zinc (ppm) 354 10 345 363 Aqua Regia Digestion
Zr, Zirconium (ppm) 6.93 0.501 6.50 7.36 Aqua Regia Digestion
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