OREAS 182b

OREAS 182b has been prepared from a blend of Ni-Co lateritic ores with a minor addition of 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.%) 0.757 0.018 0.742 0.772 Borate Fusion XRF
Co, Cobalt (ppm) 809 16 791 826 Borate Fusion XRF
Sc, Scandium (ppm) 23.2 1.75 21.3 25.1 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 6.91 0.101 6.82 7.00 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.236 0.007 0.227 0.245 Borate Fusion XRF
Cr2O3, Chromium(III) oxide (wt.%) 0.845 0.012 0.833 0.857 Borate Fusion XRF
Cu, Copper (wt.%) 0.175 0.011 0.164 0.185 Borate Fusion XRF
Fe, Iron (wt.%) 22.92 0.198 22.76 23.09 Borate Fusion XRF
K2O, Potassium oxide (wt.%) 0.444 0.009 0.434 0.454 Borate Fusion XRF
Mg, Magnesium (wt.%) 5.28 0.090 5.23 5.33 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.229 0.004 0.222 0.235 Borate Fusion XRF
Na2O, Sodium oxide (wt.%) 0.492 0.050 0.450 0.534 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.019 0.003 0.015 0.022 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 32.33 0.323 32.09 32.57 Borate Fusion XRF
Sn, Tin (ppm) < 50 IND IND IND Borate Fusion XRF
SO3, Sulphur trioxide (wt.%) 0.520 0.024 0.498 0.542 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.302 0.014 0.290 0.315 Borate Fusion XRF
V2O5, Vanadium(V) oxide (ppm) 187 14 161 213 Borate Fusion XRF
Zn, Zinc (ppm) 129 12 110 147 Borate Fusion XRF
LOI1000, Loss on ignition @1000 °C (wt.%) 15.45 0.872 15.00 15.91 Thermogravimetry
Al, Aluminium (wt.%) 3.59 0.054 3.51 3.67 Borate / Peroxide Fusion ICP
As, Arsenic (ppm) 40.2 7.6 33.2 47.3 Borate / Peroxide Fusion ICP
Ba, Barium (ppm) 128 3 123 134 Borate / Peroxide Fusion ICP
Bi, Bismuth (ppm) 1.59 0.31 1.20 1.99 Borate / Peroxide Fusion ICP
Ca, Calcium (wt.%) 0.163 0.028 0.123 0.203 Borate / Peroxide Fusion ICP
Cd, Cadmium (ppm) < 10.0 IND IND IND Borate / Peroxide Fusion ICP
Ce, Cerium (ppm) 33.4 2.72 29.1 37.8 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 768 35 732 803 Borate / Peroxide Fusion ICP
Cr, Chromium (wt.%) 0.575 0.018 0.556 0.594 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) 1.12 0.19 0.86 1.37 Borate / Peroxide Fusion ICP
Cu, Copper (wt.%) 0.173 0.004 0.169 0.177 Borate / Peroxide Fusion ICP
Dy, Dysprosium (ppm) 1.67 0.22 1.34 1.99 Borate / Peroxide Fusion ICP
Er, Erbium (ppm) 0.98 0.078 0.80 1.15 Borate / Peroxide Fusion ICP
Eu, Europium (ppm) 0.45 0.06 0.32 0.57 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 22.65 0.467 22.14 23.16 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 8.90 0.608 7.76 10.04 Borate / Peroxide Fusion ICP
Gd, Gadolinium (ppm) 1.58 0.148 1.37 1.78 Borate / Peroxide Fusion ICP
Ge, Germanium (ppm) 1.76 0.33 1.48 2.03 Borate / Peroxide Fusion ICP
Ho, Holmium (ppm) 0.32 0.026 0.25 0.38 Borate / Peroxide Fusion ICP
In, Indium (ppm) 0.16 0.04 0.05 0.27 Borate / Peroxide Fusion ICP
K, Potassium (wt.%) 0.383 0.041 0.347 0.419 Borate / Peroxide Fusion ICP
La, Lanthanum (ppm) 10.7 1.02 9.5 12.0 Borate / Peroxide Fusion ICP
Li, Lithium (ppm) 11.7 1.9 9.3 14.2 Borate / Peroxide Fusion ICP
Lu, Lutetium (ppm) 0.14 0.02 0.10 0.18 Borate / Peroxide Fusion ICP
Mg, Magnesium (wt.%) 5.18 0.097 5.07 5.29 Borate / Peroxide Fusion ICP
Mn, Manganese (wt.%) 0.175 0.006 0.170 0.180 Borate / Peroxide Fusion ICP
Mo, Molybdenum (ppm) 1.94 0.57 0.92 2.96 Borate / Peroxide Fusion ICP
Nd, Neodymium (ppm) 9.41 0.503 8.34 10.48 Borate / Peroxide Fusion ICP
Ni, Nickel (wt.%) 0.735 0.020 0.713 0.756 Borate / Peroxide Fusion ICP
Pr, Praseodymium (ppm) 2.53 0.131 2.23 2.82 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 17.0 0.60 16.2 17.8 Borate / Peroxide Fusion ICP
Re, Rhenium (ppm) < 0.10 IND IND IND Borate / Peroxide Fusion ICP
S, Sulphur (wt.%) 0.184 0.020 0.165 0.203 Borate / Peroxide Fusion ICP
Se, Selenium (ppm) < 20.0 IND IND IND Borate / Peroxide Fusion ICP
Si, Silicon (wt.%) 15.01 0.300 14.65 15.36 Borate / Peroxide Fusion ICP
Sm, Samarium (ppm) 1.80 0.20 1.33 2.28 Borate / Peroxide Fusion ICP
Sr, Strontium (ppm) 23.3 2.19 19.8 26.8 Borate / Peroxide Fusion ICP
Tb, Terbium (ppm) 0.28 0.03 0.24 0.32 Borate / Peroxide Fusion ICP
Te, Tellurium (ppm) < 1.00 IND IND IND Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 2.38 0.136 2.17 2.59 Borate / Peroxide Fusion ICP
Ti, Titanium (wt.%) 0.179 0.004 0.172 0.185 Borate / Peroxide Fusion ICP
Tl, Thallium (ppm) < 0.50 IND IND IND Borate / Peroxide Fusion ICP
Tm, Thulium (ppm) 0.14 0.02 0.10 0.18 Borate / Peroxide Fusion ICP
U, Uranium (ppm) 1.32 0.18 1.11 1.52 Borate / Peroxide Fusion ICP
V, Vanadium (ppm) 102 6 96 107 Borate / Peroxide Fusion ICP
W, Tungsten (ppm) 8.49 1.47 6.41 10.57 Borate / Peroxide Fusion ICP
Y, Yttrium (ppm) 7.51 0.467 6.87 8.15 Borate / Peroxide Fusion ICP
Yb, Ytterbium (ppm) 0.95 0.070 0.85 1.04 Borate / Peroxide Fusion ICP
Zn, Zinc (ppm) 128 10 115 141 Borate / Peroxide Fusion ICP
Zr, Zirconium (ppm) 48.6 7.4 38.1 59.0 Borate / Peroxide Fusion ICP
C, Carbon (wt.%) 2.17 0.056 2.13 2.22 Infrared Combustion
S, Sulphur (wt.%) 0.194 0.011 0.182 0.205 Infrared Combustion
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