OREAS 81

Ni–Co–PGE Ore

OREAS 81 was prepared from a blend of nickel sulphide ore materials sourced from the Cosmos and Mt Keith nickel operations in Western Australia. These materials are representative of komatiite-hosted nickel sulphide mineralisation, characterised by disseminated to massive sulphide assemblages dominated by pyrrhotite, pentlandite and chalcopyrite within ultramafic host rocks. To achieve the targeted multi-element composition, the primary nickel sulphide materials were blended with barren gabbronorite from Black Hill Quarry, South Australia, and a minor addition of PGE- and Cr-rich UG2 reef material from the Bushveld Complex, South Africa. OREAS 81 has been characterized using the following methods:

  • Lithium borate fusion with X-ray fluorescence
  • Full ICP-OES and ICP-MS elemental suites by 4-acid (HNO3-HF-HClO4-HCl) digestion
  • Sodium peroxide fusion or lithium borate fusion with full ICP-OES and ICP-MS suites
  • Sulphur by infrared combustion furnace

Certified values for applicable analytes are operationally defined for each method, with results under OREAS ISO 17034 scope of accreditation.

Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
Ni, Nickel (wt.%) 0.678 0.034 0.655 0.702 4-Acid Digestion
Co, Cobalt (ppm) 131 5 126 135 4-Acid Digestion
Au, Gold (ppb) 21.9 0.88 21.4 22.5 Pb Fire Assay
Pd, Palladium (ppb) 47.2 1.6 45.4 48.9 Pb Fire Assay
Pt, Platinum (ppb) 50.4 1.6 48.5 52.4 Pb Fire Assay
Pd, Palladium (ppb) 44.3 3.1 38.3 50.4 NiS Fire Assay
Pt, Platinum (ppb) 47.1 3.4 39.0 55.2 NiS Fire Assay
Ru, Ruthenium (ppb) 28.4 7.7 19.1 37.7 NiS Fire Assay
S, Sulphur (wt.%) 1.25 0.048 1.21 1.29 Infrared Combustion
Ag, Silver (ppm) 0.423 0.035 0.387 0.458 4-Acid Digestion
Al, Aluminium (wt.%) 6.53 0.296 6.32 6.74 4-Acid Digestion
As, Arsenic (ppm) 18.7 0.85 17.7 19.7 4-Acid Digestion
Ba, Barium (ppm) 430 9 417 444 4-Acid Digestion
Be, Beryllium (ppm) 1.32 0.086 1.24 1.39 4-Acid Digestion
Bi, Bismuth (ppm) 0.53 0.029 0.50 0.56 4-Acid Digestion
Ca, Calcium (wt.%) 4.75 0.121 4.61 4.89 4-Acid Digestion
Cd, Cadmium (ppm) 0.29 0.020 0.26 0.33 4-Acid Digestion
Ce, Cerium (ppm) 39.7 1.90 37.9 41.5 4-Acid Digestion
Cr, Chromium (wt.%) 0.176 0.043 0.151 0.201 4-Acid Digestion
Cs, Caesium (ppm) 3.99 0.238 3.76 4.23 4-Acid Digestion
Cu, Copper (ppm) 255 10 247 264 4-Acid Digestion
Dy, Dysprosium (ppm) 3.06 0.149 2.84 3.27 4-Acid Digestion
Er, Erbium (ppm) 1.71 0.092 1.56 1.86 4-Acid Digestion
Eu, Europium (ppm) 1.26 0.076 1.13 1.39 4-Acid Digestion
Fe, Iron (wt.%) 7.83 0.245 7.58 8.07 4-Acid Digestion
Ga, Gallium (ppm) 15.3 0.82 14.6 16.1 4-Acid Digestion
Gd, Gadolinium (ppm) 3.77 0.239 3.52 4.01 4-Acid Digestion
Hf, Hafnium (ppm) 1.72 0.137 1.52 1.92 4-Acid Digestion
Ho, Holmium (ppm) 0.60 0.050 0.54 0.66 4-Acid Digestion
In, Indium (ppm) 0.047 0.005 0.039 0.055 4-Acid Digestion
K, Potassium (wt.%) 1.35 0.053 1.30 1.39 4-Acid Digestion
La, Lanthanum (ppm) 18.6 0.84 17.7 19.5 4-Acid Digestion
Li, Lithium (ppm) 12.3 0.55 11.6 13.0 4-Acid Digestion
Lu, Lutetium (ppm) 0.23 0.014 0.20 0.26 4-Acid Digestion
Mg, Magnesium (wt.%) 8.09 0.318 7.83 8.35 4-Acid Digestion
Mn, Manganese (wt.%) 0.110 0.005 0.107 0.113 4-Acid Digestion
Mo, Molybdenum (ppm) 2.80 0.187 2.60 2.99 4-Acid Digestion
Na, Sodium (wt.%) 1.43 0.064 1.37 1.48 4-Acid Digestion
Nb, Niobium (ppm) 6.10 0.361 5.77 6.42 4-Acid Digestion
Nd, Neodymium (ppm) 20.7 1.19 19.5 21.8 4-Acid Digestion
P, Phosphorus (wt.%) 0.130 0.005 0.127 0.134 4-Acid Digestion
Pb, Lead (ppm) 152 6 146 157 4-Acid Digestion
Pr, Praseodymium (ppm) 4.92 0.299 4.68 5.16 4-Acid Digestion
Rb, Rubidium (ppm) 80 3.8 76 83 4-Acid Digestion
Re, Rhenium (ppm) 0.006 0.001 0.004 0.007 4-Acid Digestion
S, Sulphur (wt.%) 1.25 0.043 1.21 1.30 4-Acid Digestion
Sb, Antimony (ppm) 0.67 0.07 0.59 0.74 4-Acid Digestion
Sc, Scandium (ppm) 21.3 0.71 20.4 22.1 4-Acid Digestion
Se, Selenium (ppm) 0.87 0.17 0.70 1.04 4-Acid Digestion
Sm, Samarium (ppm) 4.35 0.229 3.99 4.71 4-Acid Digestion
Sn, Tin (ppm) 1.63 0.123 1.46 1.81 4-Acid Digestion
Sr, Strontium (ppm) 428 18 414 443 4-Acid Digestion
Ta, Tantalum (ppm) 0.42 0.05 0.38 0.46 4-Acid Digestion
Tb, Terbium (ppm) 0.54 0.040 0.51 0.58 4-Acid Digestion
Te, Tellurium (ppm) 0.100 0.024 0.066 0.133 4-Acid Digestion
Th, Thorium (ppm) 6.35 0.499 5.70 6.99 4-Acid Digestion
Ti, Titanium (wt.%) 0.526 0.021 0.509 0.543 4-Acid Digestion
Tl, Thallium (ppm) 0.29 0.015 0.27 0.31 4-Acid Digestion
Tm, Thulium (ppm) 0.23 0.03 0.19 0.27 4-Acid Digestion
U, Uranium (ppm) 1.43 0.092 1.31 1.55 4-Acid Digestion
V, Vanadium (ppm) 216 8 209 223 4-Acid Digestion
W, Tungsten (ppm) 1.33 0.087 1.24 1.42 4-Acid Digestion
Y, Yttrium (ppm) 15.7 1.09 14.9 16.5 4-Acid Digestion
Yb, Ytterbium (ppm) 1.53 0.114 1.43 1.62 4-Acid Digestion
Zn, Zinc (ppm) 156 5 150 161 4-Acid Digestion
Zr, Zirconium (ppm) 61 4.8 55 66 4-Acid Digestion
Al2O3, Aluminium(III) oxide (wt.%) 12.16 0.255 11.90 12.41 Borate / Peroxide Fusion ICP
As, Arsenic (ppm) 16.4 4.2 11.5 21.4 Borate / Peroxide Fusion ICP
Ba, Barium (ppm) 430 12 414 446 Borate / Peroxide Fusion ICP
Be, Beryllium (ppm) 1.48 0.31 1.08 1.89 Borate / Peroxide Fusion ICP
Bi, Bismuth (ppm) 0.48 0.08 0.38 0.58 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 6.69 0.160 6.49 6.88 Borate / Peroxide Fusion ICP
Cd, Cadmium (ppm) < 10.0 IND IND IND Borate / Peroxide Fusion ICP
Ce, Cerium (ppm) 39.0 1.70 36.0 42.1 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 136 4 131 142 Borate / Peroxide Fusion ICP
Cr, Chromium (wt.%) 0.272 0.009 0.262 0.282 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) 3.80 0.238 3.49 4.11 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 249 14 237 262 Borate / Peroxide Fusion ICP
Dy, Dysprosium (ppm) 3.09 0.170 2.84 3.33 Borate / Peroxide Fusion ICP
Er, Erbium (ppm) 1.65 0.102 1.51 1.78 Borate / Peroxide Fusion ICP
Eu, Europium (ppm) 1.25 0.056 1.13 1.37 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 11.31 0.311 11.04 11.59 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 15.6 1.15 14.4 16.9 Borate / Peroxide Fusion ICP
Gd, Gadolinium (ppm) 3.66 0.291 3.27 4.05 Borate / Peroxide Fusion ICP
Ho, Holmium (ppm) 0.58 0.027 0.54 0.62 Borate / Peroxide Fusion ICP
In, Indium (ppm) < 0.20 IND IND IND Borate / Peroxide Fusion ICP
K2O, Potassium oxide (wt.%) 1.60 0.058 1.53 1.66 Borate / Peroxide Fusion ICP
La, Lanthanum (ppm) 18.0 0.80 17.1 18.9 Borate / Peroxide Fusion ICP
Li, Lithium (ppm) 13.8 2.0 10.4 17.3 Borate / Peroxide Fusion ICP
Lu, Lutetium (ppm) 0.21 0.03 0.18 0.25 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 13.51 0.425 13.09 13.92 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (wt.%) 0.145 0.006 0.138 0.151 Borate / Peroxide Fusion ICP
Mo, Molybdenum (ppm) 3.21 0.68 2.12 4.29 Borate / Peroxide Fusion ICP
Nb, Niobium (ppm) 5.51 0.413 4.97 6.04 Borate / Peroxide Fusion ICP
Nd, Neodymium (ppm) 20.6 1.10 19.2 21.9 Borate / Peroxide Fusion ICP
Ni, Nickel (wt.%) 0.687 0.034 0.663 0.712 Borate / Peroxide Fusion ICP
P2O5, Phosphorus(V) oxide (wt.%) 0.290 0.018 0.266 0.315 Borate / Peroxide Fusion ICP
Pb, Lead (ppm) 150 10 140 161 Borate / Peroxide Fusion ICP
Pr, Praseodymium (ppm) 4.89 0.242 4.67 5.11 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 78 2.6 75 82 Borate / Peroxide Fusion ICP
S, Sulphur (wt.%) 1.25 0.057 1.20 1.30 Borate / Peroxide Fusion ICP
Sb, Antimony (ppm) 0.64 0.16 0.52 0.77 Borate / Peroxide Fusion ICP
Sc, Scandium (ppm) 20.3 1.20 19.1 21.4 Borate / Peroxide Fusion ICP
Se, Selenium (ppm) < 20.0 IND IND IND Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 46.04 2.216 44.44 47.64 Borate / Peroxide Fusion ICP
Sm, Samarium (ppm) 4.21 0.186 3.97 4.46 Borate / Peroxide Fusion ICP
Sn, Tin (ppm) 1.61 0.27 1.18 2.04 Borate / Peroxide Fusion ICP
Sr, Strontium (ppm) 426 20 404 448 Borate / Peroxide Fusion ICP
Tb, Terbium (ppm) 0.53 0.031 0.47 0.60 Borate / Peroxide Fusion ICP
Te, Tellurium (ppm) < 1.00 IND IND IND Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 6.32 0.592 5.47 7.17 Borate / Peroxide Fusion ICP
TiO2, Titanium dioxide (wt.%) 0.873 0.023 0.848 0.898 Borate / Peroxide Fusion ICP
Tl, Thallium (ppm) 0.26 0.021 0.25 0.28 Borate / Peroxide Fusion ICP
Tm, Thulium (ppm) 0.24 0.017 0.20 0.27 Borate / Peroxide Fusion ICP
U, Uranium (ppm) 1.41 0.123 1.18 1.65 Borate / Peroxide Fusion ICP
V, Vanadium (ppm) 218 11 211 226 Borate / Peroxide Fusion ICP
Y, Yttrium (ppm) 16.2 0.60 15.6 16.9 Borate / Peroxide Fusion ICP
Yb, Ytterbium (ppm) 1.52 0.098 1.35 1.69 Borate / Peroxide Fusion ICP
Zn, Zinc (ppm) 159 12 146 172 Borate / Peroxide Fusion ICP
Zr, Zirconium (ppm) 74 4.7 66 82 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 12.17 0.223 12.02 12.32 Borate Fusion XRF
BaO, Barium oxide (ppm) 478 46 401 555 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 6.74 0.103 6.66 6.81 Borate Fusion XRF
Co, Cobalt (ppm) 123 22 101 146 Borate Fusion XRF
Cr2O3, Chromium(III) oxide (ppm) 3945 112 3818 4073 Borate Fusion XRF
Cu, Copper (ppm) 259 17 237 281 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 11.36 0.116 11.25 11.48 Borate Fusion XRF
Hf, Hafnium (ppm) < 80 IND IND IND Borate Fusion XRF
K2O, Potassium oxide (wt.%) 1.56 0.021 1.54 1.58 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 13.50 0.341 13.30 13.71 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.145 0.004 0.139 0.151 Borate Fusion XRF
Na2O, Sodium oxide (wt.%) 1.82 0.079 1.75 1.88 Borate Fusion XRF
Ni, Nickel (wt.%) 0.707 0.030 0.688 0.727 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.291 0.008 0.283 0.300 Borate Fusion XRF
S, Sulphur (wt.%) 1.25 0.117 1.19 1.32 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 45.60 0.325 45.21 45.99 Borate Fusion XRF
Sn, Tin (ppm) < 50 IND IND IND Borate Fusion XRF
Sr, Strontium (ppm) 417 56 371 464 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.880 0.018 0.863 0.897 Borate Fusion XRF
V2O5, Vanadium(V) oxide (ppm) 364 17 353 376 Borate Fusion XRF
Zn, Zinc (ppm) 170 14 153 188 Borate Fusion XRF
LOI1000, Loss on ignition @1000 °C (wt.%) 4.54 0.308 4.38 4.70 Thermogravimetry
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