OREAS 181b

OREAS 181b has been prepared from a blend of Ni-Co lateritic ores and barren siliclastic sedimentary rock sourced from Victoria, Australia. The Ni-Co lateritic ores were sourced predominantly from the north-eastern Goldfields of Western Australia. Minor additions of Ni-Co lateritic ores from other regions were also added. The lateritic ores formed from prolonged lateritic weathering of Archaean (Yilgarn Craton) olivine rich ultramafic/komatiite flows. Grades of >1% Ni were generated in zones of more intense weathering associated with faulting and bedrock alteration. Ni-Co nontronitic (Fe-Ni smectite clays) siliceous ores formed with a goethitic overprint in the upper laterite profile.

Twenty-six commercial analytical laboratories participated in the program to certify the elements reported below:

  • Lithium borate fusion whole rock analysis package with X-ray fluorescence
  • Thermogravimetry: Loss on Ignition (LOI) at 1000 °C
  • Sodium peroxide/borate fusion with full suite ICP-OES or ICP-MS elemental packages
  • Total C and S by infrared combustion furnace

Homogeneity was assessed using XRF analysis on 12 pulp samples (20 g each) from six sampling units. An ANOVA test was performed to compare within- and between-unit variances, providing a statistical measure of uniformity and confirming that all units belong to the same population.

Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
Ni, Nickel (wt.%) 0.520 0.014 0.508 0.532 Borate Fusion XRF
Co, Cobalt (ppm) 458 8 443 473 Borate Fusion XRF
Sc, Scandium (ppm) 19.8 0.92 18.7 20.8 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 7.20 0.095 7.11 7.28 Borate Fusion XRF
BaO, Barium oxide (ppm) 238 42 167 310 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.364 0.007 0.355 0.373 Borate Fusion XRF
Cr2O3, Chromium(III) oxide (wt.%) 0.657 0.014 0.645 0.669 Borate Fusion XRF
Cu, Copper (ppm) < 50 IND IND IND Borate Fusion XRF
Fe, Iron (wt.%) 24.21 0.227 24.00 24.42 Borate Fusion XRF
K2O, Potassium oxide (wt.%) 0.733 0.012 0.719 0.747 Borate Fusion XRF
Mg, Magnesium (wt.%) 3.48 0.045 3.45 3.51 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.174 0.006 0.171 0.178 Borate Fusion XRF
Na2O, Sodium oxide (wt.%) 0.330 0.026 0.306 0.353 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.035 0.004 0.031 0.040 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 38.83 0.379 38.45 39.21 Borate Fusion XRF
Sn, Tin (ppm) < 50 IND IND IND Borate Fusion XRF
SO3, Sulphur trioxide (wt.%) 0.267 0.020 0.247 0.288 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.332 0.010 0.323 0.342 Borate Fusion XRF
V2O5, Vanadium(V) oxide (ppm) 165 29 111 220 Borate Fusion XRF
Zn, Zinc (ppm) 92 14 72 112 Borate Fusion XRF
LOI1000, Loss on ignition @1000 °C (wt.%) 9.78 0.239 9.59 9.97 Thermogravimetry
Al, Aluminium (wt.%) 3.74 0.054 3.67 3.81 Borate / Peroxide Fusion ICP
As, Arsenic (ppm) 115 16 94 136 Borate / Peroxide Fusion ICP
B, Boron (ppm) 354 42 304 405 Borate / Peroxide Fusion ICP
Ba, Barium (ppm) 210 6 203 218 Borate / Peroxide Fusion ICP
Be, Beryllium (ppm) 1.07 0.096 0.91 1.23 Borate / Peroxide Fusion ICP
Bi, Bismuth (ppm) 4.89 0.94 3.64 6.14 Borate / Peroxide Fusion ICP
Ca, Calcium (wt.%) 0.258 0.037 0.229 0.286 Borate / Peroxide Fusion ICP
Cd, Cadmium (ppm) < 10.0 IND IND IND Borate / Peroxide Fusion ICP
Ce, Cerium (ppm) 34.1 3.6 29.4 38.7 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 442 21 420 464 Borate / Peroxide Fusion ICP
Cr, Chromium (wt.%) 0.445 0.011 0.432 0.458 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) 2.68 0.190 2.38 2.97 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 40.7 2.09 37.3 44.2 Borate / Peroxide Fusion ICP
Dy, Dysprosium (ppm) 2.08 0.203 1.86 2.30 Borate / Peroxide Fusion ICP
Er, Erbium (ppm) 1.16 0.091 1.01 1.32 Borate / Peroxide Fusion ICP
Eu, Europium (ppm) 0.54 0.07 0.42 0.66 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 24.12 0.441 23.45 24.78 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 9.38 0.682 8.31 10.46 Borate / Peroxide Fusion ICP
Gd, Gadolinium (ppm) 2.07 0.23 1.78 2.37 Borate / Peroxide Fusion ICP
Ge, Germanium (ppm) 1.78 0.35 1.01 2.55 Borate / Peroxide Fusion ICP
Ho, Holmium (ppm) 0.40 0.021 0.36 0.43 Borate / Peroxide Fusion ICP
In, Indium (ppm) < 0.10 IND IND IND Borate / Peroxide Fusion ICP
K, Potassium (wt.%) 0.626 0.056 0.575 0.678 Borate / Peroxide Fusion ICP
La, Lanthanum (ppm) 13.7 1.16 12.1 15.4 Borate / Peroxide Fusion ICP
Li, Lithium (ppm) 12.7 3.5 8.8 16.6 Borate / Peroxide Fusion ICP
Lu, Lutetium (ppm) 0.16 0.03 0.11 0.20 Borate / Peroxide Fusion ICP
Mg, Magnesium (wt.%) 3.40 0.089 3.30 3.49 Borate / Peroxide Fusion ICP
Mn, Manganese (wt.%) 0.134 0.003 0.128 0.140 Borate / Peroxide Fusion ICP
Mo, Molybdenum (ppm) 2.37 0.52 1.61 3.14 Borate / Peroxide Fusion ICP
Nd, Neodymium (ppm) 11.2 0.68 10.4 11.9 Borate / Peroxide Fusion ICP
Ni, Nickel (wt.%) 0.513 0.012 0.499 0.527 Borate / Peroxide Fusion ICP
Pr, Praseodymium (ppm) 3.17 0.315 2.76 3.59 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 33.4 1.81 31.4 35.4 Borate / Peroxide Fusion ICP
Re, Rhenium (ppm) < 0.10 IND IND IND Borate / Peroxide Fusion ICP
S, Sulphur (wt.%) 0.097 0.018 0.074 0.121 Borate / Peroxide Fusion ICP
Se, Selenium (ppm) < 20.0 IND IND IND Borate / Peroxide Fusion ICP
Si, Silicon (wt.%) 18.04 0.361 17.58 18.50 Borate / Peroxide Fusion ICP
Sm, Samarium (ppm) 2.28 0.31 1.91 2.65 Borate / Peroxide Fusion ICP
Sr, Strontium (ppm) 32.5 2.80 29.1 35.9 Borate / Peroxide Fusion ICP
Tb, Terbium (ppm) 0.33 0.05 0.26 0.39 Borate / Peroxide Fusion ICP
Te, Tellurium (ppm) < 1.00 IND IND IND Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 4.62 0.50 4.02 5.23 Borate / Peroxide Fusion ICP
Ti, Titanium (wt.%) 0.196 0.006 0.187 0.205 Borate / Peroxide Fusion ICP
Tl, Thallium (ppm) < 0.50 IND IND IND Borate / Peroxide Fusion ICP
Tm, Thulium (ppm) 0.17 0.014 0.14 0.20 Borate / Peroxide Fusion ICP
U, Uranium (ppm) 1.02 0.16 0.80 1.25 Borate / Peroxide Fusion ICP
V, Vanadium (ppm) 85 6.6 78 91 Borate / Peroxide Fusion ICP
W, Tungsten (ppm) 22.9 3.0 18.5 27.4 Borate / Peroxide Fusion ICP
Y, Yttrium (ppm) 10.5 0.61 9.5 11.4 Borate / Peroxide Fusion ICP
Yb, Ytterbium (ppm) 1.15 0.098 0.99 1.31 Borate / Peroxide Fusion ICP
Zn, Zinc (ppm) 95 7.1 87 104 Borate / Peroxide Fusion ICP
C, Carbon (wt.%) 1.10 0.029 1.07 1.12 Infrared Combustion
S, Sulphur (wt.%) 0.102 0.009 0.092 0.112 Infrared Combustion
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