OREAS 37

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).

Analyte Certified Value 1SD 95% Confidence Limits Low 95% Confidence Limits High Method
Zn, Zinc (wt.%) 6.26 0.150 6.17 6.35 3-Acid Digestion (no HF)
Pb, Lead (wt.%) 0.615 0.017 0.599 0.631 3-Acid Digestion (no HF)
Ag, Silver (ppm) 5.19 0.63 4.77 5.62 3-Acid Digestion (no HF)
As, Arsenic (ppm) 449 28 438 461 3-Acid Digestion (no HF)
Cu, Copper (ppm) 125 5 120 131 3-Acid Digestion (no HF)
Fe, Iron (wt.%) 23.76 0.560 23.31 24.22 3-Acid Digestion (no HF)
Mn, Manganese (wt.%) 0.719 0.017 0.687 0.751 3-Acid Digestion (no HF)
Tl, Thallium (ppm) 63 5.0 59 66 3-Acid Digestion (no HF)
Ag, Silver (ppm) 5.00 4.20 5.80 Peroxide Fusion ICP
As, Arsenic (ppm) 460 42 424 496 Peroxide Fusion ICP
Cu, Copper (ppm) 129 6 123 135 Peroxide Fusion ICP
Fe, Iron (wt.%) 23.53 0.540 22.88 24.19 Peroxide Fusion ICP
Mn, Manganese (wt.%) 0.769 0.027 0.751 0.786 Peroxide Fusion ICP
Pb, Lead (wt.%) 0.597 0.020 0.589 0.605 Peroxide Fusion ICP
Tl, Thallium (ppm) 156 139 174 Peroxide Fusion ICP
Zn, Zinc (wt.%) 6.30 0.180 6.09 6.51 Peroxide Fusion ICP
S, Sulphur (wt.%) 26.79 0.710 26.14 27.45 Infrared Combustion
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