Specifications
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CRM State:
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Matrix:
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Mineralisation:
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:
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 |