| Description: OREAS 37 is a medium grade zinc ore matrix-matched certified reference material (MMCRM) prepared by Ore Research and Exploration. It is one of 3 MMCRM's sourced from the Gamsberg Zn deposit located in the Northern Cape Province of South Africa, approximately 20km west of the Black Mountain mine. Gamsberg is a stratiform base metal Broken Hill Style (BHS) deposit located in the mid-proterozoic Bushmanland Province of the Namaqualand Metamorphic Complex (NMC) of South Africa. The NMC is a highly deformed and metamorphosed supracrustal succession of dominantly pelitic schists and quartzites, deposited on a regionally extensive �2000 Ma basement (Rozendal & Stalder, 2001). The stratiform ores have a close spatial and genetic association with metamorphosed chemical sediments including manganiferous iron formations, quartz-garnet rocks (coticules), Ca-Mn marbles and barite (Rozendal & Stalder, 2001). Download Certificate OREAS37 Download DataPack OREAS37 | Analyte | Certified Value | 1SD | 95% CI Low | 95% CI High | Method |
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| Ag, Silver (ppm) | 5.19 | 0.63 | 4.93 | 5.45 | 3-Acid Digestion (no HF) | | As, Arsenic (ppm) | 499 | 28 | 427 | 472 | 3-Acid Digestion (no HF) | | Cu, Copper (ppm) | 125 | 5 | 119 | 132 | 3-Acid Digestion (no HF) | | Fe, Iron (wt.%) | 23.76 | 0.56 | 22.58 | 24.95 | 3-Acid Digestion (no HF) | | Mn, Manganese (wt.%) | 0.719 | 0.017 | 0.683 | 0.755 | 3-Acid Digestion (no HF) | | Pb, Lead (wt.%) | 0.615 | 0.017 | 0.584 | 0.646 | 3-Acid Digestion (no HF) | | Tl, Thallium (ppm) | 63 | 5 | 59 | 66 | 3-Acid Digestion (no HF) | | Zn, Zinc (wt.%) | 6.26 | 0.15 | 5.95 | 6.57 | 3-Acid Digestion (no HF) | | S, Sulphur (wt.%) | 26.79 | 0.71 | 25.45 | 28.13 | Infrared Combustion | | Ag, Silver (ppm) | 5 | | 4.2 | 5.8 | Peroxide Fusion ICP | | As, Arsenic (ppm) | 460 | 42 | 437 | 483 | Peroxide Fusion ICP | | Cu, Copper (ppm) | 129 | 6 | 123 | 136 | Peroxide Fusion ICP | | Fe, Iron (wt.%) | 23.53 | 0.54 | 22.36 | 24.71 | Peroxide Fusion ICP | | Mn, Manganese (wt.%) | 0.769 | 0.027 | 0.73 | 0.807 | Peroxide Fusion ICP | | Pb, Lead (wt.%) | 0.597 | 0.02 | 0.567 | 0.627 | Peroxide Fusion ICP | | Tl, Thallium (ppm) | 156 | | 139 | 174 | Peroxide Fusion ICP | | Zn, Zinc (wt.%) | 6.3 | 0.18 | 5.99 | 6.62 | Peroxide Fusion ICP |
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