Specifications
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CRM State:
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Matrix:
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Mineralisation:
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:
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 |