OREAS 171

OREAS 171 is a supergene manganese ore matrix-matched certified reference material (MMCRM) prepared and certified by Ore Research & Exploration Pty Ltd. The material was sourced from the Groote Eylandt Mining Company Pty Ltd (GEMCO) Mn deposit which is hosted within a shallow dipping Lower Cretaceous sedimentary rock unit. Groote Eylandt is in the Gulf of Carpentaria off the coast of Australia’s Northern Territory. A portion (22%) of barren siltstone sourced from a quarry north of Melbourne, Australia was added to lower the grade. OREAS 171 is one of a suite of four Mn ore MMCRMs certified by borate fusion XRF covering a Mn grade range of 35-46%.

Analyte Certified Value 1SD 95% Confidence Limits Low 95% Confidence Limits High Method
Mn, Manganese (wt.%) 35.10 0.167 35.02 35.18 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 24.82 0.170 24.74 24.90 Borate Fusion XRF
Fe, Iron (wt.%) 3.66 0.034 3.64 3.68 Borate Fusion XRF
Al2O3, Aluminium(III) oxide (wt.%) 7.32 0.123 7.25 7.39 Borate Fusion XRF
BaO, Barium oxide (wt.%) 0.247 0.011 0.241 0.253 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.081 0.007 0.078 0.084 Borate Fusion XRF
K2O, Potassium oxide (wt.%) 2.05 0.030 2.04 2.07 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 0.217 0.016 0.208 0.226 Borate Fusion XRF
Na2O, Sodium oxide (wt.%) 0.236 0.015 0.227 0.244 Borate Fusion XRF
P, Phosphorus (ppm) 663 24 648 677 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.336 0.009 0.331 0.341 Borate Fusion XRF
V2O5, Vanadium(V) oxide (ppm) 418 45 386 450 Borate Fusion XRF
LOI1000, Loss On Ignition @1000 °C (wt.%) 10.54 0.148 10.45 10.63 Thermogravimetry
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