OREAS 38

OREAS 38 is a high 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 Low 95% Confidence High Method
Zn, Zinc (wt.%) 10.06 0.140 9.56 10.56 3-Acid Digestion (no HF)
Pb, Lead (wt.%) 0.592 0.018 0.562 0.621 3-Acid Digestion (no HF)
Ag, Silver (ppm) 5.49 0.420 5.21 5.76 3-Acid Digestion (no HF)
As, Arsenic (ppm) 298 17 283 313 3-Acid Digestion (no HF)
Cu, Copper (ppm) 111 5 106 117 3-Acid Digestion (no HF)
Fe, Iron (wt.%) 21.28 0.420 20.22 22.34 3-Acid Digestion (no HF)
Mn, Manganese (wt.%) 1.37 0.040 1.30 1.44 3-Acid Digestion (no HF)
Tl, Thallium (ppm) 64 5.5 61 67 3-Acid Digestion (no HF)
Ag, Silver (ppm) ~5.00 Peroxide Fusion ICP
As, Arsenic (ppm) 300 26 285 315 Peroxide Fusion ICP
Cu, Copper (ppm) 108 9 103 114 Peroxide Fusion ICP
Fe, Iron (wt.%) 20.98 0.840 19.94 22.03 Peroxide Fusion ICP
Mn, Manganese (wt.%) 1.57 0.040 1.49 1.65 Peroxide Fusion ICP
Pb, Lead (wt.%) 0.560 0.010 0.532 0.588 Peroxide Fusion ICP
Tl, Thallium (ppm) 124 5 118 130 Peroxide Fusion ICP
Zn, Zinc (wt.%) 9.99 0.200 9.49 10.49 Peroxide Fusion ICP
S, Sulphur (wt.%) 22.32 0.340 21.21 23.44 Infrared Combustion
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  • 10g Sachet
    $4.70
    32,000 +
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