OREAS 36

OREAS 36 is a low 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.%) 4.19 0.058 4.11 4.26 3-Acid Digestion (no HF)
Pb, Lead (wt.%) 0.579 0.013 0.564 0.593 3-Acid Digestion (no HF)
Ag, Silver (ppm) 10.2 0.63 9.7 10.7 3-Acid Digestion (no HF)
As, Arsenic (ppm) 722 32 707 738 3-Acid Digestion (no HF)
Cu, Copper (ppm) 151 5 147 155 3-Acid Digestion (no HF)
Fe, Iron (wt.%) 20.68 0.370 20.24 21.12 3-Acid Digestion (no HF)
Mn, Manganese (wt.%) 1.08 0.030 0.98 1.18 3-Acid Digestion (no HF)
Tl, Thallium (ppm) ~65 3-Acid Digestion (no HF)
S, Sulphur (wt.%) 18.81 0.220 18.39 19.32 Infrared Combustion
Ag, Silver (ppm) 9.60 8.40 10.90 Peroxide Fusion ICP
As, Arsenic (ppm) 699 54 630 767 Peroxide Fusion ICP
Cu, Copper (ppm) 153 7 150 155 Peroxide Fusion ICP
Fe, Iron (wt.%) 21.06 0.850 20.35 21.77 Peroxide Fusion ICP
Mn, Manganese (wt.%) 1.27 0.030 1.24 1.30 Peroxide Fusion ICP
Pb, Lead (wt.%) 0.553 0.010 0.540 0.565 Peroxide Fusion ICP
Tl, Thallium (ppm) 109 3 97 122 Peroxide Fusion ICP
Zn, Zinc (wt.%) 4.22 0.130 4.08 4.37 Peroxide Fusion ICP
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