OREAS 165

OREAS 165 is a medium grade copper ore certified reference material (CRM) prepared and certified by Ore Research & Exploration Pth Ltd. The material was sourced from Xstrata’s Mt Isa copper ore deposits located near the township of Mt Isa in north-west Queensland. The ore deposits are hosted by brecciated siliceous and dolomitic rock masses within the Urquhart Shale comprising complex and dissociated veins with chalcopyrite, pyrite and pyrrhotite with grades of 3-4% copper. OREAS 165 is one of a suite of seven CRMs characterised for Cu, Fe, S, CaO, MgO, Al2O3, SiO2, Ag, Pb, Zn and Co by both sodium peroxide fusion ICP and 4-acid ICP methods.

Analyte Certified Value 1SD 95% Confidence Limits Low 95% Confidence Limits High Method
Cu, Copper (wt.%) 3.21 0.150 3.10 3.32 Peroxide Fusion ICP
Fe, Iron (wt.%) 8.86 0.230 8.69 9.04 Peroxide Fusion ICP
Co, Cobalt (ppm) 2445 157 2333 2557 4-Acid Digestion
Ag, Silver (ppm) 3.10 0.70 2.30 3.90 Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 2.61 0.080 2.55 2.67 Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 0.110 0.050 0.060 0.170 Peroxide Fusion ICP
Co, Cobalt (ppm) 2485 104 2411 2559 Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 3.48 0.120 3.40 3.57 Peroxide Fusion ICP
Pb, Lead (ppm) 434 44 402 467 Peroxide Fusion ICP
S, Sulphur (wt.%) 8.28 0.270 8.06 8.50 Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 72.00 2.300 70.20 73.80 Peroxide Fusion ICP
Zn, Zinc (ppm) 44.0 15.0 27.0 61.0 Peroxide Fusion ICP
Ag, Silver (ppm) 3.02 0.140 2.91 3.14 4-Acid Digestion
Al2O3, Aluminium(III) oxide (wt.%) 2.59 0.130 2.49 2.69 4-Acid Digestion
CaO, Calcium oxide (wt.%) 0.081 0.008 0.077 0.085 4-Acid Digestion
Cu, Copper (wt.%) 3.20 0.070 3.16 3.24 4-Acid Digestion
Fe, Iron (wt.%) 8.86 0.220 8.69 9.03 4-Acid Digestion
MgO, Magnesium oxide (wt.%) 3.53 0.120 3.42 3.63 4-Acid Digestion
Pb, Lead (ppm) 443 33 422 464 4-Acid Digestion
S, Sulphur (wt.%) 8.50 0.500 8.10 9.00 4-Acid Digestion
Zn, Zinc (ppm) 37.0 9.0 29.0 45.0 4-Acid Digestion
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