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OREAS 81
OREAS 81 is a nickel sulphide Certified Reference Material prepared from a combination of high-grade komatiite-hosted nickel sulphide ore, PGE-rich ultramafic material, mafic gabbro, and gold-bearing epithermal ore. The primary components of the blend include Xstrata Nickel’s high-grade sulphide ore from the Leinster district (Western Australia), Mt Keith nickel feed material, ultramafic–hosted PGE ore from the UG2 Reef (South Africa), and fresh gabbroic rock sourced from the Black Hill intrusion (Western Australia). A small proportion of high-grade gold ore from the Lihir operation (Papua New Guinea) contributes additional trace-level Au variability representative of complex multi-commodity geological environments.
OREAS 81 has been characterized using the following methods:
- Lithium borate fusion with X-ray fluorescence
- Full ICP-OES and ICP-MS elemental suites by 4-acid (HNO3-HF-HClO4-HCl) digestion
- Sodium peroxide fusion or lithium borate fusion with full ICP-OES and ICP-MS suites
- Sulphur by infrared combustion furnace
Certified values for applicable analytes are operationally defined for each method, with results under OREAS ISO 17034 scope of accreditation.
Note: Analyte values are indicative only and may change when certified.
| Analyte | Indicative Value | 1SD | Expanded Uncertainty Low | Expanded Uncertainty High | Method |
|---|---|---|---|---|---|
| Ni, Nickel (wt.%) | 0.700 | TBD | TBD | TBD | 4-Acid Digestion |
| Cu, Copper (ppm) | 250 | TBD | TBD | TBD | 4-Acid Digestion |
| Cr, Chromium (wt.%) | 0.250 | TBD | TBD | TBD | 4-Acid Digestion |
| S, Sulphur (wt.%) | 1.26 | TBD | TBD | TBD | Infrared Combustion |
| Co, Cobalt (ppm) | 134 | TBD | TBD | TBD | 4-Acid Digestion |
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