OREAS 350

OREAS 350 is a zinc concentrate certified reference material (CRM) prepared and certified by Ore Research & Exploration Pty Ltd. The material constituting OREAS 350 was sourced from the McArthur River Mining operation located in the Gulf of Carpentaria region in the Northern Territory of Australia. The mine is situated about 900 km southeast of Darwin. The major sulphides are pyrite, sphalerite and galena, with lesser chalcopyrite, arsenopyrite and marcasite. 

Analyte Certified Value 1SD 95% Confidence Low 95% Confidence High Method
Zn, Zinc (wt.%) 44.12 0.144 44.04 44.21 Acid Digestion Titration
Zn, Zinc (wt.%) 44.13 1.365 42.49 45.77 4-Acid Digestion
Pb, Lead (wt.%) 8.22 0.211 8.08 8.35 4-Acid Digestion
Ag, Silver (ppm) 96.6 2.68 95.5 97.7 4-Acid Digestion
As, Arsenic (ppm) 900 28 881 919 4-Acid Digestion
Bi, Bismuth (ppm) 5.00 IND IND IND 4-Acid Digestion
Cd, Cadmium (ppm) 932 41 909 955 4-Acid Digestion
Cu, Copper (wt.%) 0.854 0.014 0.847 0.862 4-Acid Digestion
Fe, Iron (wt.%) 5.23 0.182 5.12 5.33 4-Acid Digestion
Mg, Magnesium (wt.%) 0.263 0.018 0.253 0.273 4-Acid Digestion
Sb, Antimony (ppm) 108 20 93 123 4-Acid Digestion
Tl, Thallium (ppm) 128 11 121 134 4-Acid Digestion
SiO2, Silicon dioxide (wt.%) 6.12 0.232 5.99 6.26 Peroxide Fusion ICP
S, Sulphur (wt.%) 28.82 1.093 28.17 29.48 Infrared Combustion
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Specifications
CRM Group