OREAS 160

OREAS 160 is a copper blank certified reference material (CRM) prepared and certified by Ore Research & Exploration Pty Ltd. The material was sourced from Xstrata’s Mt Isa copper deposits located near the township of Mt Isa in north-west Queensland. The 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 160 is sourced from barren copper material and 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 (ppm) 13.0 2.0 12.0 14.0 4-Acid Digestion
Fe, Iron (wt.%) 1.13 0.060 1.08 1.17 Peroxide Fusion ICP
Co, Cobalt (ppm) 2.80 0.50 2.50 3.10 4-Acid Digestion
Ag, Silver (ppm) < 2.00 IND IND IND Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 5.01 0.080 4.96 5.05 Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 0.150 0.040 0.120 0.180 Peroxide Fusion ICP
Co, Cobalt (ppm) < 8.00 IND IND IND Peroxide Fusion ICP
Cu, Copper (wt.%) < 0.020 IND IND IND Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 0.620 0.040 0.590 0.650 Peroxide Fusion ICP
Pb, Lead (ppm) 7.00 2.00 2.00 13.00 Peroxide Fusion ICP
S, Sulphur (wt.%) 0.040 0.020 0.030 0.050 Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 88.70 4.800 84.90 92.50 Peroxide Fusion ICP
Zn, Zinc (ppm) < 30.0 IND IND IND Peroxide Fusion ICP
Ag, Silver (ppm) < 0.200 IND IND IND 4-Acid Digestion
Al2O3, Aluminium(III) oxide (wt.%) 5.04 0.270 4.84 5.24 4-Acid Digestion
CaO, Calcium oxide (wt.%) 0.146 0.005 0.142 0.149 4-Acid Digestion
Fe, Iron (wt.%) 1.15 0.040 1.13 1.18 4-Acid Digestion
MgO, Magnesium oxide (wt.%) 0.640 0.040 0.610 0.660 4-Acid Digestion
Pb, Lead (ppm) 6.60 0.70 6.00 7.20 4-Acid Digestion
S, Sulphur (wt.%) 0.029 0.002 0.027 0.031 4-Acid Digestion
Zn, Zinc (ppm) 7.00 2.00 5.00 9.00 4-Acid Digestion
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