OREAS 151b

OREAS 151b is one of three (second generation) porphyry Cu-Au certified reference materials (CRMs). It has been prepared from copper ore drilling reject material from 27 drill holes from the Waisoi district, Viti Levu, Fiji, with the addition of a minor quantity of Cu concentrate (0.1%) and barren granodiorite (10%). The two deposits in the Waisoi district are the Waisoi East deposit (quartz porphyry) and the Waisoi West deposit (diorite porphyry). Copper mineralisation in the region is accompanied by stockwork quartz veinlets and is characterised by bornite-chalcopyrite-pyrite assemblages formed under a high sulphidation environment.

Analyte Certified Value 1SD 95% Confidence Limits Low 95% Confidence Limits High Method
Au, Gold (ppb) 65 5.6 63 67 Pb Fire Assay
Cu, Copper (wt.%) 0.182 0.005 0.180 0.184 4-Acid Digestion
Cu-Sol(CN), Copper soluble (cyanidation) (wt.%) 0.032 0.002 0.031 0.033 Cyanide Leach
Ag, Silver (ppm) 0.551 0.068 0.523 0.579 4-Acid Digestion
Al, Aluminium (wt.%) 7.84 0.331 7.69 7.98 4-Acid Digestion
As, Arsenic (ppm) 30.7 3.01 29.3 32.2 4-Acid Digestion
Ba, Barium (ppm) 203 9 200 207 4-Acid Digestion
Be, Beryllium (ppm) 0.82 0.09 0.77 0.87 4-Acid Digestion
Bi, Bismuth (ppm) 0.37 0.05 0.33 0.41 4-Acid Digestion
Ca, Calcium (wt.%) 2.02 0.076 1.99 2.05 4-Acid Digestion
Cd, Cadmium (ppm) 0.58 0.06 0.56 0.61 4-Acid Digestion
Ce, Cerium (ppm) 20.1 3.2 17.3 22.9 4-Acid Digestion
Co, Cobalt (ppm) 11.6 1.4 11.0 12.2 4-Acid Digestion
Cr, Chromium (ppm) 28.2 3.5 26.8 29.6 4-Acid Digestion
Cs, Caesium (ppm) 1.81 0.087 1.75 1.86 4-Acid Digestion
Dy, Dysprosium (ppm) 2.59 0.147 2.51 2.67 4-Acid Digestion
Er, Erbium (ppm) 1.46 0.125 1.35 1.57 4-Acid Digestion
Eu, Europium (ppm) 0.80 0.069 0.73 0.87 4-Acid Digestion
Fe, Iron (wt.%) 3.53 0.125 3.48 3.59 4-Acid Digestion
Ga, Gallium (ppm) 18.4 1.42 17.6 19.2 4-Acid Digestion
Gd, Gadolinium (ppm) 2.80 0.137 2.66 2.94 4-Acid Digestion
Hf, Hafnium (ppm) < 1.00 IND IND IND 4-Acid Digestion
Ho, Holmium (ppm) 0.53 0.045 0.47 0.59 4-Acid Digestion
In, Indium (ppm) 0.078 0.005 0.075 0.081 4-Acid Digestion
K, Potassium (wt.%) 1.23 0.049 1.21 1.25 4-Acid Digestion
La, Lanthanum (ppm) 9.91 1.02 9.45 10.38 4-Acid Digestion
Li, Lithium (ppm) 8.34 0.524 8.12 8.56 4-Acid Digestion
Lu, Lutetium (ppm) 0.19 0.02 0.17 0.21 4-Acid Digestion
Mg, Magnesium (wt.%) 1.62 0.068 1.58 1.65 4-Acid Digestion
Mn, Manganese (wt.%) 0.033 0.001 0.033 0.034 4-Acid Digestion
Mo, Molybdenum (ppm) 55 2.2 54 56 4-Acid Digestion
Na, Sodium (wt.%) 2.22 0.081 2.19 2.26 4-Acid Digestion
Nb, Niobium (ppm) 3.38 0.34 3.25 3.52 4-Acid Digestion
Nd, Neodymium (ppm) 11.4 0.88 10.7 12.1 4-Acid Digestion
Ni, Nickel (ppm) 15.2 1.49 14.5 15.8 4-Acid Digestion
P, Phosphorus (wt.%) 0.058 0.004 0.057 0.060 4-Acid Digestion
Pb, Lead (ppm) 43.6 3.00 42.6 44.7 4-Acid Digestion
Pr, Praseodymium (ppm) 2.81 0.230 2.56 3.06 4-Acid Digestion
Rb, Rubidium (ppm) 36.9 5.0 33.6 40.1 4-Acid Digestion
Re, Rhenium (ppm) 0.17 0.02 0.15 0.18 4-Acid Digestion
S, Sulphur (wt.%) 0.724 0.016 0.717 0.731 4-Acid Digestion
Sb, Antimony (ppm) 1.00 0.053 0.98 1.02 4-Acid Digestion
Sc, Scandium (ppm) 15.8 1.14 15.2 16.3 4-Acid Digestion
Se, Selenium (ppm) 3.54 0.59 3.23 3.85 4-Acid Digestion
Sm, Samarium (ppm) 2.72 0.137 2.55 2.89 4-Acid Digestion
Sn, Tin (ppm) 1.83 0.146 1.72 1.94 4-Acid Digestion
Sr, Strontium (ppm) 170 7 167 174 4-Acid Digestion
Ta, Tantalum (ppm) < 0.40 IND IND IND 4-Acid Digestion
Tb, Terbium (ppm) 0.44 0.05 0.41 0.47 4-Acid Digestion
Te, Tellurium (ppm) 0.11 0.02 0.10 0.13 4-Acid Digestion
Th, Thorium (ppm) 2.57 0.172 2.48 2.66 4-Acid Digestion
Ti, Titanium (wt.%) 0.308 0.033 0.292 0.323 4-Acid Digestion
Tl, Thallium (ppm) 0.23 0.02 0.21 0.24 4-Acid Digestion
Tm, Thulium (ppm) 0.21 0.02 0.18 0.23 4-Acid Digestion
U, Uranium (ppm) 0.72 0.07 0.67 0.76 4-Acid Digestion
V, Vanadium (ppm) 203 10 199 208 4-Acid Digestion
W, Tungsten (ppm) 2.36 0.41 2.03 2.68 4-Acid Digestion
Y, Yttrium (ppm) 13.3 1.22 12.6 13.9 4-Acid Digestion
Yb, Ytterbium (ppm) 1.38 0.17 1.22 1.55 4-Acid Digestion
Zn, Zinc (ppm) 246 10 241 251 4-Acid Digestion
Zr, Zirconium (ppm) 17.1 3.2 15.2 18.9 4-Acid Digestion
Ag, Silver (ppm) 0.516 0.040 0.504 0.529 Aqua Regia Digestion
Al, Aluminium (wt.%) 2.43 0.108 2.38 2.48 Aqua Regia Digestion
As, Arsenic (ppm) 30.8 1.45 30.3 31.3 Aqua Regia Digestion
Au, Gold (ppb) 65 3.6 63 67 Aqua Regia Digestion
Ba, Barium (ppm) 71 5.5 69 74 Aqua Regia Digestion
Be, Beryllium (ppm) 0.22 0.03 0.20 0.24 Aqua Regia Digestion
Bi, Bismuth (ppm) 0.40 0.05 0.36 0.44 Aqua Regia Digestion
Ca, Calcium (wt.%) 1.37 0.050 1.35 1.39 Aqua Regia Digestion
Cd, Cadmium (ppm) 0.58 0.055 0.56 0.60 Aqua Regia Digestion
Ce, Cerium (ppm) 16.2 0.56 15.8 16.7 Aqua Regia Digestion
Co, Cobalt (ppm) 10.9 0.78 10.6 11.2 Aqua Regia Digestion
Cr, Chromium (ppm) 26.3 1.50 25.6 27.0 Aqua Regia Digestion
Cs, Caesium (ppm) 1.22 0.17 1.08 1.35 Aqua Regia Digestion
Cu, Copper (wt.%) 0.180 0.005 0.178 0.182 Aqua Regia Digestion
Dy, Dysprosium (ppm) 2.20 0.29 1.82 2.58 Aqua Regia Digestion
Er, Erbium (ppm) 1.24 0.20 0.91 1.57 Aqua Regia Digestion
Eu, Europium (ppm) 0.60 0.09 0.49 0.72 Aqua Regia Digestion
Fe, Iron (wt.%) 3.28 0.106 3.24 3.33 Aqua Regia Digestion
Ga, Gallium (ppm) 8.09 1.34 7.39 8.78 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.100 0.005 0.097 0.103 Aqua Regia Digestion
Hg, Mercury (ppm) < 1.00 IND IND IND Aqua Regia Digestion
In, Indium (ppm) 0.070 0.006 0.064 0.075 Aqua Regia Digestion
K, Potassium (wt.%) 0.404 0.027 0.392 0.417 Aqua Regia Digestion
La, Lanthanum (ppm) 7.34 0.552 7.04 7.63 Aqua Regia Digestion
Li, Lithium (ppm) 6.07 1.04 5.33 6.81 Aqua Regia Digestion
Lu, Lutetium (ppm) 0.12 0.006 0.12 0.13 Aqua Regia Digestion
Mg, Magnesium (wt.%) 1.42 0.053 1.39 1.44 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.028 0.001 0.027 0.028 Aqua Regia Digestion
Mo, Molybdenum (ppm) 54 2.7 52 55 Aqua Regia Digestion
Na, Sodium (wt.%) 0.176 0.009 0.172 0.180 Aqua Regia Digestion
Nd, Neodymium (ppm) 9.36 0.465 8.85 9.87 Aqua Regia Digestion
Ni, Nickel (ppm) 14.2 0.79 13.8 14.5 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.052 0.002 0.051 0.052 Aqua Regia Digestion
Pb, Lead (ppm) 41.4 1.59 40.7 42.2 Aqua Regia Digestion
Rb, Rubidium (ppm) 20.4 1.28 19.1 21.7 Aqua Regia Digestion
Re, Rhenium (ppm) 0.17 0.02 0.14 0.20 Aqua Regia Digestion
S, Sulphur (wt.%) 0.723 0.031 0.708 0.737 Aqua Regia Digestion
Sb, Antimony (ppm) 0.68 0.11 0.61 0.76 Aqua Regia Digestion
Sc, Scandium (ppm) 8.84 0.680 8.51 9.16 Aqua Regia Digestion
Se, Selenium (ppm) 3.06 0.38 2.87 3.25 Aqua Regia Digestion
Sm, Samarium (ppm) 2.23 0.100 2.13 2.32 Aqua Regia Digestion
Sn, Tin (ppm) 1.25 0.17 1.09 1.42 Aqua Regia Digestion
Sr, Strontium (ppm) 38.5 2.33 37.5 39.6 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.10 IND IND IND Aqua Regia Digestion
Tb, Terbium (ppm) 0.36 0.021 0.33 0.38 Aqua Regia Digestion
Te, Tellurium (ppm) 0.085 0.012 0.077 0.094 Aqua Regia Digestion
Th, Thorium (ppm) 2.44 0.151 2.33 2.54 Aqua Regia Digestion
Ti, Titanium (wt.%) 0.075 0.007 0.071 0.078 Aqua Regia Digestion
Tl, Thallium (ppm) 0.12 0.02 0.11 0.13 Aqua Regia Digestion
Tm, Thulium (ppm) 0.14 0.013 0.12 0.16 Aqua Regia Digestion
U, Uranium (ppm) 0.60 0.034 0.57 0.62 Aqua Regia Digestion
V, Vanadium (ppm) 140 5 137 142 Aqua Regia Digestion
W, Tungsten (ppm) < 1.00 IND IND IND Aqua Regia Digestion
Y, Yttrium (ppm) 10.4 0.50 10.1 10.7 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.93 0.054 0.88 0.98 Aqua Regia Digestion
Zn, Zinc (ppm) 238 9 235 242 Aqua Regia Digestion
Zr, Zirconium (ppm) 3.17 0.42 2.86 3.48 Aqua Regia Digestion
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