OREAS 85

OREAS 85 was prepared from Ni-Cu-Co ore grade drill core samples sourced from the Nova Mine in Western Australia. The Nova Mine, owned and operated by Independence Group (IGO), is located in the Fraser Range, approximately 160km east-northeast of Norseman, 360km southeast of Kalgoorlie and 380km from the Port of Esperance in Western Australia. OREAS 85 is one of two Ni-Cu-Co ore CRMs prepared (the other is the higher grade ‘OREAS 86’).

Twenty-one laboratories participated in the program to certify:

• Au, Pd and Pt by 25-50g Pb collection fire assay with ICP-MS, ICP-OES or AAS finish;
• Au by 15-50g aqua regia digestion with ICP OES/MS finish or AAS finish;
• Al2O3, CaO, Co, Cu, Fe2O3, K2O, MgO, Na2O, Ni, P2O5, S, SiO2 and TiO2 by lithium borate fusion with XRF finish;
• Loss on ignition at 1000° Celsius;
• 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;
• Au by instrumental neutron activation analysis (INAA) on 20 x 85mg subsamples to confirm homogeneity.

Analyte Certified Value 1SD 95% Confidence Low 95% Confidence High Method
Ni, Nickel (wt.%) 0.344 0.015 0.337 0.351 4-Acid Digestion
Cu, Copper (wt.%) 0.176 0.004 0.174 0.178 4-Acid Digestion
Co, Cobalt (ppm) 178 9 174 182 4-Acid Digestion
Au, Gold (ppb) 61 2.4 60 62 Pb Fire Assay
Pd, Palladium (ppb) 7.00 0.79 6.65 7.35 Pb Fire Assay
Pt, Platinum (ppb) 4.00 0.38 3.72 4.29 Pb Fire Assay
Au, Gold (ppb) 60 3.2 57 62 Aqua Regia Digestion (sample weights 10-50g)
Al2O3, Aluminium(III) oxide (wt.%) 12.93 0.151 12.85 13.02 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 9.07 0.133 9.00 9.14 Borate Fusion XRF
Co, Cobalt (ppm) 184 9 179 188 Borate Fusion XRF
Cr2O3, Chromium(III) oxide (ppm) 1045 72 984 1106 Borate Fusion XRF
Cu, Copper (wt.%) 0.174 0.006 0.171 0.177 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 13.95 0.171 13.87 14.03 Borate Fusion XRF
K2O, Potassium oxide (wt.%) 0.245 0.006 0.242 0.249 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 13.72 0.155 13.64 13.80 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.170 0.002 0.168 0.171 Borate Fusion XRF
Na2O, Sodium oxide (wt.%) 1.35 0.039 1.32 1.38 Borate Fusion XRF
Ni, Nickel (wt.%) 0.353 0.010 0.348 0.358 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.058 0.003 0.057 0.060 Borate Fusion XRF
S, Sulphur (wt.%) 2.06 0.043 2.03 2.08 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 46.03 0.541 45.76 46.31 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.470 0.014 0.463 0.477 Borate Fusion XRF
LOI1000, Loss On Ignition @1000°C (wt.%) 1.13 0.170 1.04 1.22 Thermogravimetry
S, Sulphur (wt.%) 2.05 0.045 2.02 2.07 Infrared Combustion
Ag, Silver (ppm) 0.581 0.062 0.544 0.617 4-Acid Digestion
Al, Aluminium (wt.%) 6.77 0.153 6.70 6.83 4-Acid Digestion
As, Arsenic (ppm) 2.12 0.70 1.68 2.56 4-Acid Digestion
Ba, Barium (ppm) 82 3.7 80 84 4-Acid Digestion
Be, Beryllium (ppm) 0.31 0.04 0.29 0.33 4-Acid Digestion
Bi, Bismuth (ppm) 0.45 0.026 0.44 0.47 4-Acid Digestion
Ca, Calcium (wt.%) 6.34 0.258 6.22 6.46 4-Acid Digestion
Cd, Cadmium (ppm) 0.33 0.026 0.32 0.34 4-Acid Digestion
Ce, Cerium (ppm) 9.14 0.492 8.90 9.38 4-Acid Digestion
Cr, Chromium (ppm) 480 79 443 517 4-Acid Digestion
Cs, Caesium (ppm) 0.37 0.018 0.36 0.38 4-Acid Digestion
Dy, Dysprosium (ppm) 1.95 0.121 1.87 2.03 4-Acid Digestion
Er, Erbium (ppm) 1.23 0.047 1.20 1.27 4-Acid Digestion
Eu, Europium (ppm) 0.57 0.043 0.54 0.60 4-Acid Digestion
Fe, Iron (wt.%) 9.53 0.407 9.35 9.71 4-Acid Digestion
Ga, Gallium (ppm) 11.5 0.60 11.2 11.8 4-Acid Digestion
Gd, Gadolinium (ppm) 1.79 0.145 1.69 1.88 4-Acid Digestion
Hf, Hafnium (ppm) 0.74 0.062 0.71 0.77 4-Acid Digestion
Ho, Holmium (ppm) 0.42 0.016 0.41 0.43 4-Acid Digestion
In, Indium (ppm) 0.054 0.004 0.052 0.055 4-Acid Digestion
K, Potassium (wt.%) 0.208 0.012 0.202 0.213 4-Acid Digestion
La, Lanthanum (ppm) 3.89 0.252 3.76 4.02 4-Acid Digestion
Li, Lithium (ppm) 7.72 0.442 7.54 7.91 4-Acid Digestion
Lu, Lutetium (ppm) 0.18 0.011 0.17 0.19 4-Acid Digestion
Mg, Magnesium (wt.%) 8.20 0.239 8.10 8.30 4-Acid Digestion
Mn, Manganese (wt.%) 0.128 0.006 0.125 0.131 4-Acid Digestion
Mo, Molybdenum (ppm) 1.54 0.107 1.50 1.59 4-Acid Digestion
Na, Sodium (wt.%) 1.02 0.050 1.00 1.05 4-Acid Digestion
Nb, Niobium (ppm) 1.18 0.090 1.13 1.23 4-Acid Digestion
Nd, Neodymium (ppm) 5.60 0.374 5.35 5.85 4-Acid Digestion
P, Phosphorus (wt.%) 0.025 0.002 0.025 0.026 4-Acid Digestion
Pb, Lead (ppm) 5.50 0.493 5.21 5.79 4-Acid Digestion
Pr, Praseodymium (ppm) 1.25 0.046 1.21 1.29 4-Acid Digestion
Rb, Rubidium (ppm) 6.05 0.332 5.91 6.20 4-Acid Digestion
Re, Rhenium (ppm) 0.027 0.002 0.026 0.028 4-Acid Digestion
S, Sulphur (wt.%) 2.01 0.104 1.96 2.07 4-Acid Digestion
Sb, Antimony (ppm) 0.27 0.03 0.26 0.29 4-Acid Digestion
Sc, Scandium (ppm) 28.0 2.01 27.1 29.0 4-Acid Digestion
Se, Selenium (ppm) 4.97 0.87 4.12 5.82 4-Acid Digestion
Sm, Samarium (ppm) 1.51 0.114 1.40 1.62 4-Acid Digestion
Sn, Tin (ppm) 0.51 0.042 0.49 0.52 4-Acid Digestion
Sr, Strontium (ppm) 140 5 138 142 4-Acid Digestion
Ta, Tantalum (ppm) 0.084 0.013 0.075 0.093 4-Acid Digestion
Tb, Terbium (ppm) 0.31 0.012 0.30 0.32 4-Acid Digestion
Te, Tellurium (ppm) 0.31 0.06 0.28 0.33 4-Acid Digestion
Th, Thorium (ppm) 0.58 0.048 0.54 0.61 4-Acid Digestion
Ti, Titanium (wt.%) 0.267 0.009 0.262 0.271 4-Acid Digestion
Tl, Thallium (ppm) 0.044 0.005 0.043 0.046 4-Acid Digestion
Tm, Thulium (ppm) 0.17 0.013 0.16 0.19 4-Acid Digestion
U, Uranium (ppm) 0.21 0.016 0.20 0.22 4-Acid Digestion
V, Vanadium (ppm) 151 6 148 154 4-Acid Digestion
W, Tungsten (ppm) 0.55 0.07 0.52 0.58 4-Acid Digestion
Y, Yttrium (ppm) 10.7 0.38 10.5 10.8 4-Acid Digestion
Yb, Ytterbium (ppm) 1.17 0.038 1.15 1.19 4-Acid Digestion
Zn, Zinc (ppm) 79 5.5 76 81 4-Acid Digestion
Zr, Zirconium (ppm) 20.9 0.78 20.6 21.2 4-Acid Digestion
Ag, Silver (ppm) 0.552 0.046 0.524 0.580 Aqua Regia Digestion
Al, Aluminium (wt.%) 4.91 0.317 4.75 5.07 Aqua Regia Digestion
As, Arsenic (ppm) 2.22 0.27 2.06 2.38 Aqua Regia Digestion
B, Boron (ppm) < 10.0 IND IND IND Aqua Regia Digestion
Ba, Barium (ppm) 54 9 48 59 Aqua Regia Digestion
Be, Beryllium (ppm) 0.18 0.03 0.17 0.20 Aqua Regia Digestion
Bi, Bismuth (ppm) 0.41 0.05 0.38 0.44 Aqua Regia Digestion
Ca, Calcium (wt.%) 3.46 0.327 3.30 3.62 Aqua Regia Digestion
Cd, Cadmium (ppm) 0.15 0.011 0.15 0.16 Aqua Regia Digestion
Ce, Cerium (ppm) 4.68 0.62 4.35 5.00 Aqua Regia Digestion
Co, Cobalt (ppm) 144 7 140 148 Aqua Regia Digestion
Cr, Chromium (ppm) 119 20 108 130 Aqua Regia Digestion
Cs, Caesium (ppm) 0.33 0.027 0.31 0.34 Aqua Regia Digestion
Cu, Copper (wt.%) 0.172 0.007 0.168 0.176 Aqua Regia Digestion
Dy, Dysprosium (ppm) 0.58 0.10 0.44 0.72 Aqua Regia Digestion
Er, Erbium (ppm) 0.36 0.10 0.26 0.45 Aqua Regia Digestion
Eu, Europium (ppm) 0.35 0.06 0.28 0.41 Aqua Regia Digestion
Fe, Iron (wt.%) 5.04 0.206 4.94 5.14 Aqua Regia Digestion
Ga, Gallium (ppm) 6.84 0.489 6.56 7.12 Aqua Regia Digestion
Gd, Gadolinium (ppm) 0.65 0.13 0.51 0.79 Aqua Regia Digestion
Ge, Germanium (ppm) 0.086 0.016 0.065 0.107 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.097 0.019 0.084 0.111 Aqua Regia Digestion
Ho, Holmium (ppm) 0.13 0.03 0.10 0.17 Aqua Regia Digestion
In, Indium (ppm) 0.016 0.004 0.013 0.018 Aqua Regia Digestion
K, Potassium (wt.%) 0.144 0.009 0.140 0.148 Aqua Regia Digestion
La, Lanthanum (ppm) 2.30 0.25 2.17 2.44 Aqua Regia Digestion
Li, Lithium (ppm) 3.51 0.236 3.39 3.63 Aqua Regia Digestion
Mg, Magnesium (wt.%) 2.62 0.135 2.55 2.70 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.031 0.003 0.030 0.033 Aqua Regia Digestion
Mo, Molybdenum (ppm) 1.43 0.076 1.39 1.47 Aqua Regia Digestion
Na, Sodium (wt.%) 0.737 0.075 0.698 0.777 Aqua Regia Digestion
Nd, Neodymium (ppm) 2.54 0.49 2.07 3.02 Aqua Regia Digestion
Ni, Nickel (wt.%) 0.330 0.013 0.324 0.337 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.023 0.001 0.023 0.024 Aqua Regia Digestion
Pb, Lead (ppm) 3.97 0.56 3.66 4.28 Aqua Regia Digestion
Pd, Palladium (ppb) < 10.0 IND IND IND Aqua Regia Digestion
Pr, Praseodymium (ppm) 0.58 0.09 0.48 0.68 Aqua Regia Digestion
Rb, Rubidium (ppm) 5.15 0.464 4.88 5.41 Aqua Regia Digestion
Re, Rhenium (ppm) 0.026 0.002 0.024 0.028 Aqua Regia Digestion
S, Sulphur (wt.%) 1.94 0.111 1.88 2.00 Aqua Regia Digestion
Sb, Antimony (ppm) 0.11 0.02 0.10 0.12 Aqua Regia Digestion
Sc, Scandium (ppm) 4.77 0.86 4.20 5.34 Aqua Regia Digestion
Se, Selenium (ppm) 4.86 0.445 4.59 5.14 Aqua Regia Digestion
Sm, Samarium (ppm) 0.57 0.12 0.43 0.71 Aqua Regia Digestion
Sn, Tin (ppm) 0.20 0.02 0.18 0.21 Aqua Regia Digestion
Sr, Strontium (ppm) 119 5 116 122 Aqua Regia Digestion
Ta, Tantalum (ppm) < 0.005 IND IND IND Aqua Regia Digestion
Tb, Terbium (ppm) 0.099 0.023 0.074 0.125 Aqua Regia Digestion
Te, Tellurium (ppm) 0.29 0.05 0.26 0.31 Aqua Regia Digestion
Th, Thorium (ppm) 0.33 0.033 0.30 0.35 Aqua Regia Digestion
Tl, Thallium (ppm) 0.034 0.005 0.032 0.037 Aqua Regia Digestion
U, Uranium (ppm) 0.17 0.02 0.16 0.18 Aqua Regia Digestion
V, Vanadium (ppm) 38.7 6.6 35.1 42.3 Aqua Regia Digestion
W, Tungsten (ppm) 0.16 0.03 0.14 0.18 Aqua Regia Digestion
Y, Yttrium (ppm) 3.43 0.73 3.03 3.82 Aqua Regia Digestion
Zn, Zinc (ppm) 14.2 2.7 12.8 15.6 Aqua Regia Digestion
Zr, Zirconium (ppm) 3.73 0.63 3.37 4.08 Aqua Regia Digestion
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