OREAS 171
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Description
Description
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 |
