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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