OREAS 172

OREAS 172 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 small portion (4.6%) of barren siltstone sourced from a quarry north of Melbourne, Australia was added to lower the grade. OREAS 172 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 Low 95% Confidence High Method
Mn, Manganese (wt.%) 42.75 0.214 42.64 42.87 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 14.09 0.085 14.05 14.14 Borate Fusion XRF
Fe, Iron (wt.%) 3.83 0.040 3.80 3.85 Borate Fusion XRF
Al2O3, Aluminium(III) oxide (wt.%) 5.80 0.058 5.76 5.83 Borate Fusion XRF
BaO, Barium oxide (wt.%) 0.285 0.012 0.279 0.292 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.095 0.007 0.092 0.099 Borate Fusion XRF
K2O, Potassium oxide (wt.%) 1.89 0.032 1.87 1.91 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 0.141 0.014 0.133 0.149 Borate Fusion XRF
Na2O, Sodium oxide (wt.%) 0.273 0.016 0.264 0.281 Borate Fusion XRF
P, Phosphorus (ppm) 752 17 743 761 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.236 0.009 0.233 0.240 Borate Fusion XRF
V2O5, Vanadium(V) oxide (ppm) 501 45 467 536 Borate Fusion XRF
LOI1000, Loss on ignition @1000°C (wt.%) 12.04 0.156 11.95 12.13 Thermogravimetry
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Specifications
CRM Group