OREAS 151c

OREAS 151c is a porphyry Cu-Au certified reference material prepared from a blend of ores, barren granodiorite and a minor addition of molybdenum concentrate. 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
Au, Gold (ppb) 80 4.9 78 82 Pb Fire Assay
Au, Gold (ppb) 74 3.3 72 75 Aqua Regia Digestion (sample weights 10-50g)
Ag, Silver (ppm) 0.995 0.039 0.936 1.054 4-Acid Digestion
Al, Aluminium (wt.%) 7.56 0.413 7.22 7.90 4-Acid Digestion
As, Arsenic (ppm) 23.0 1.52 21.4 24.6 4-Acid Digestion
Ba, Barium (ppm) 905 46 872 939 4-Acid Digestion
Be, Beryllium (ppm) 2.23 0.159 2.10 2.35 4-Acid Digestion
Bi, Bismuth (ppm) 6.92 0.301 6.57 7.27 4-Acid Digestion
Ca, Calcium (wt.%) 1.55 0.077 1.49 1.61 4-Acid Digestion
Cd, Cadmium (ppm) 0.31 0.026 0.28 0.35 4-Acid Digestion
Ce, Cerium (ppm) 65 7 61 70 4-Acid Digestion
Co, Cobalt (ppm) 7.61 0.425 7.22 8.01 4-Acid Digestion
Cr, Chromium (ppm) 43.5 4.04 41.0 46.0 4-Acid Digestion
Cs, Caesium (ppm) 9.56 0.451 9.00 10.12 4-Acid Digestion
Cu, Copper (wt.%) 0.239 0.009 0.232 0.247 4-Acid Digestion
Dy, Dysprosium (ppm) 3.29 0.212 3.04 3.54 4-Acid Digestion
Er, Erbium (ppm) 1.29 0.087 1.16 1.41 4-Acid Digestion
Eu, Europium (ppm) 1.29 0.14 1.14 1.45 4-Acid Digestion
Fe, Iron (wt.%) 3.00 0.116 2.90 3.09 4-Acid Digestion
Ga, Gallium (ppm) 20.6 1.00 19.7 21.5 4-Acid Digestion
Gd, Gadolinium (ppm) 5.26 0.215 4.93 5.59 4-Acid Digestion
Hf, Hafnium (ppm) 1.63 0.096 1.53 1.74 4-Acid Digestion
Ho, Holmium (ppm) 0.53 0.036 0.49 0.58 4-Acid Digestion
In, Indium (ppm) 0.12 0.010 0.11 0.13 4-Acid Digestion
K, Potassium (wt.%) 2.67 0.055 2.60 2.75 4-Acid Digestion
La, Lanthanum (ppm) 31.3 1.98 29.4 33.3 4-Acid Digestion
Li, Lithium (ppm) 45.1 1.95 43.3 46.8 4-Acid Digestion
Lu, Lutetium (ppm) 0.15 0.02 0.13 0.17 4-Acid Digestion
Mg, Magnesium (wt.%) 0.724 0.029 0.700 0.748 4-Acid Digestion
Mn, Manganese (wt.%) 0.032 0.001 0.031 0.033 4-Acid Digestion
Mo, Molybdenum (ppm) 57 2.5 55 59 4-Acid Digestion
Na, Sodium (wt.%) 2.16 0.043 2.10 2.22 4-Acid Digestion
Nb, Niobium (ppm) 11.0 0.58 10.4 11.6 4-Acid Digestion
Nd, Neodymium (ppm) 29.6 1.49 27.5 31.8 4-Acid Digestion
Ni, Nickel (ppm) 18.1 0.62 17.3 18.9 4-Acid Digestion
P, Phosphorus (wt.%) 0.080 0.003 0.077 0.082 4-Acid Digestion
Pb, Lead (ppm) 41.5 2.42 39.9 43.2 4-Acid Digestion
Pr, Praseodymium (ppm) 7.64 0.337 6.90 8.38 4-Acid Digestion
Rb, Rubidium (ppm) 147 8 139 156 4-Acid Digestion
Re, Rhenium (ppm) 0.055 0.004 0.050 0.060 4-Acid Digestion
S, Sulphur (wt.%) 0.695 0.025 0.673 0.717 4-Acid Digestion
Sb, Antimony (ppm) 2.02 0.117 1.92 2.12 4-Acid Digestion
Sc, Scandium (ppm) 8.23 0.455 7.80 8.65 4-Acid Digestion
Se, Selenium (ppm) 4.79 0.53 3.94 5.64 4-Acid Digestion
Sm, Samarium (ppm) 6.20 0.367 5.70 6.71 4-Acid Digestion
Sn, Tin (ppm) 4.97 0.338 4.69 5.25 4-Acid Digestion
Sr, Strontium (ppm) 194 10 185 202 4-Acid Digestion
Ta, Tantalum (ppm) 0.98 0.072 0.92 1.03 4-Acid Digestion
Tb, Terbium (ppm) 0.68 0.067 0.60 0.76 4-Acid Digestion
Te, Tellurium (ppm) 1.27 0.086 1.16 1.38 4-Acid Digestion
Th, Thorium (ppm) 12.4 0.71 11.7 13.1 4-Acid Digestion
Ti, Titanium (wt.%) 0.330 0.012 0.320 0.341 4-Acid Digestion
Tl, Thallium (ppm) 0.85 0.049 0.81 0.89 4-Acid Digestion
Tm, Thulium (ppm) 0.17 0.013 0.14 0.19 4-Acid Digestion
U, Uranium (ppm) 3.42 0.264 2.93 3.92 4-Acid Digestion
V, Vanadium (ppm) 75 2.5 73 77 4-Acid Digestion
W, Tungsten (ppm) 9.04 1.02 7.97 10.12 4-Acid Digestion
Y, Yttrium (ppm) 14.0 1.13 13.1 15.0 4-Acid Digestion
Yb, Ytterbium (ppm) 1.03 0.081 0.90 1.16 4-Acid Digestion
Zn, Zinc (ppm) 94 4.1 91 98 4-Acid Digestion
Zr, Zirconium (ppm) 53 3.1 50 56 4-Acid Digestion
Ag, Silver (ppm) 1.01 0.053 0.96 1.06 Aqua Regia Digestion
Al, Aluminium (wt.%) 1.94 0.099 1.88 2.00 Aqua Regia Digestion
As, Arsenic (ppm) 21.5 1.14 20.4 22.6 Aqua Regia Digestion
B, Boron (ppm) < 10.0 IND IND IND Aqua Regia Digestion
Ba, Barium (ppm) 424 35 403 444 Aqua Regia Digestion
Be, Beryllium (ppm) 1.46 0.127 1.37 1.55 Aqua Regia Digestion
Bi, Bismuth (ppm) 6.56 0.628 6.14 6.99 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.427 0.030 0.411 0.444 Aqua Regia Digestion
Cd, Cadmium (ppm) 0.22 0.03 0.19 0.24 Aqua Regia Digestion
Ce, Cerium (ppm) 31.0 2.41 28.7 33.3 Aqua Regia Digestion
Co, Cobalt (ppm) 7.47 0.563 7.11 7.83 Aqua Regia Digestion
Cr, Chromium (ppm) 49.2 2.33 47.7 50.8 Aqua Regia Digestion
Cs, Caesium (ppm) 8.13 0.348 7.74 8.51 Aqua Regia Digestion
Cu, Copper (wt.%) 0.239 0.006 0.234 0.244 Aqua Regia Digestion
Fe, Iron (wt.%) 2.94 0.121 2.86 3.02 Aqua Regia Digestion
Ga, Gallium (ppm) 9.04 0.555 8.64 9.44 Aqua Regia Digestion
Ge, Germanium (ppm) 0.13 0.02 0.10 0.15 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.25 0.024 0.23 0.27 Aqua Regia Digestion
Hg, Mercury (ppm) 0.050 0.010 0.031 0.068 Aqua Regia Digestion
In, Indium (ppm) 0.10 0.008 0.10 0.11 Aqua Regia Digestion
K, Potassium (wt.%) 0.894 0.049 0.867 0.920 Aqua Regia Digestion
La, Lanthanum (ppm) 14.5 1.13 13.4 15.6 Aqua Regia Digestion
Li, Lithium (ppm) 37.8 2.10 36.6 39.1 Aqua Regia Digestion
Lu, Lutetium (ppm) 0.090 0.013 0.071 0.109 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.683 0.026 0.665 0.701 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.028 0.001 0.027 0.029 Aqua Regia Digestion
Mo, Molybdenum (ppm) 55 2.3 53 57 Aqua Regia Digestion
Na, Sodium (wt.%) 0.154 0.018 0.144 0.164 Aqua Regia Digestion
Ni, Nickel (ppm) 17.2 1.06 16.2 18.2 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.060 0.002 0.058 0.062 Aqua Regia Digestion
Pb, Lead (ppm) 20.8 2.8 19.2 22.4 Aqua Regia Digestion
Rb, Rubidium (ppm) 89 2.2 86 92 Aqua Regia Digestion
Re, Rhenium (ppm) 0.056 0.003 0.052 0.060 Aqua Regia Digestion
S, Sulphur (wt.%) 0.676 0.030 0.654 0.699 Aqua Regia Digestion
Sb, Antimony (ppm) 1.46 0.16 1.35 1.57 Aqua Regia Digestion
Sc, Scandium (ppm) 7.18 0.643 6.78 7.59 Aqua Regia Digestion
Se, Selenium (ppm) 4.48 0.296 4.05 4.90 Aqua Regia Digestion
Sn, Tin (ppm) 3.57 0.170 3.38 3.76 Aqua Regia Digestion
Sr, Strontium (ppm) 34.9 2.37 33.4 36.4 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.010 IND IND IND Aqua Regia Digestion
Tb, Terbium (ppm) 0.48 0.06 0.39 0.57 Aqua Regia Digestion
Te, Tellurium (ppm) 1.27 0.076 1.18 1.36 Aqua Regia Digestion
Th, Thorium (ppm) 6.03 0.504 5.53 6.54 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.234 0.013 0.225 0.242 Aqua Regia Digestion
Tl, Thallium (ppm) 0.57 0.023 0.54 0.60 Aqua Regia Digestion
U, Uranium (ppm) 3.06 0.241 2.65 3.46 Aqua Regia Digestion
V, Vanadium (ppm) 61 2.2 60 63 Aqua Regia Digestion
W, Tungsten (ppm) 5.60 0.64 4.98 6.22 Aqua Regia Digestion
Y, Yttrium (ppm) 10.3 0.53 9.9 10.6 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.69 0.038 0.64 0.74 Aqua Regia Digestion
Zn, Zinc (ppm) 91 3.0 88 93 Aqua Regia Digestion
Zr, Zirconium (ppm) 6.30 0.63 5.89 6.72 Aqua Regia Digestion
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