We’re pleased to announce the release of six Certified Reference Materials (CRMs) including;
OREAS 22j — a grey primary quartz blank for monitoring low-level gold contamination, OREAS 161b — representing sediment-hosted copper ore, and four nickel-cobalt CRMs, OREAS 452, 453, 455 and 188, representing lateritic mineralisation associated with weathered ultramafic and mafic rocks.
Confidence at the Cut-Off: OREAS 231c – Available November 2026
OREAS 231c is the direct replacement for OREAS 231b, one of OREAS’ popular gold CRMs. The material is in the final stages of production and will be available for purchase in the coming weeks.
With a gold grade of approximately 0.5 ppm (0.5 g/t) Au, OREAS 231c sits within a grade range commonly relevant to open-pit gold cut-off decisions. Reliable analytical performance at these concentrations is important for exploration, resource definition, grade control and ore/waste classification, where relatively small differences in reported gold grade can influence important operational decisions.
Prepared from gold ore sourced from the Frogs Leg Gold Mine in Western Australia’s Eastern Goldfields, OREAS 231c represents quartz–carbonate vein-hosted gold mineralisation within mafic–ultramafic greenstones. Barren greenstone was incorporated to achieve the target grade while maintaining a representative greenstone-hosted matrix.
OREAS 231c provides a fit-for-purpose quality-control material for laboratories and mining operations requiring confidence in gold assays around this commercially important low-grade range.
When a few tenths of a gram per tonne can influence whether material is classified as ore or waste, confidence in the assay matters.
OREAS Releases
| OREAS ID | Description | Replaces |
| 452 | lateritic nickel-cobalt (1.06 % Ni, 805 ppm Co) | 184 |
| 453 | lateritic nickel-cobalt (1.40 % Ni, 654 ppm Co) | 186 |
| 455 | lateritic nickel-cobalt (1.65 % Ni, 851 ppm Co) | 190 |
| 188 | lateritic nickel-cobalt (1.64 % Ni, 328 ppm Co) | 189 |
| 22j | primary quartz blank (<1 ppb Au) | 22i |
| 161b | shale/siliceous dolomite; sediment-hosted (0.409 % Cu) | 161 |
Coming Soon
| OREAS ID | Description | Replaces |
| 231c | orogenic gold, greenstone, (0.5 ppm Au) | 231b |
| 232c | orogenic gold, metasediments (0.9 ppm Au) | 232b |
| 239c | orogenic gold, metasediments (3.5 ppm Au) | 239b |
| 245b | orogenic gold, metasediments (25.5 ppm Au) | 245 |
| 272 | orogenic gold (0.8 ppm Au) | 252c |
| 609d | high-sulphidation epithermal gold-silver-copper ore (5.11 ppm Au, 25.6 ppm Ag, 0.514 % Cu) | 609c |
| 513 | porphyry copper-gold (0.534 % Cu, 694 ppb Au, 353 ppm Mo) | 503e |