OREAS 131a

OREAS 131a is one of 8 pigeon paired CRM’s prepared from zinc-lead mineralised material from Xstrata’s Black Star and George Fisher orebodies, Mt Isa, NW Queensland, Australia. The orebodies are sediment hosted ‘SEDEX’ Zn-Pb-Ag deposits located within the Urquart Shale Formation of the Mount Isa Group, a weakly metamorphosed, 5 km thick sequence composed predominantly of Mesoproterozoic carbonate siltstones, mudstones and shales. The Urquart Shale consists of a sequence of alternating pyrite-rich dolomitic siltstone and shale beds up to 1000 metres thick and was deposited in a lacustrine setting within an intracratonic rift basin. The orebodies lie within the upper 650m and are bounded by the Mount Isa fault on the west and by volcanic greenstones to the east. Comprising galena and sphalerite with pyrite and pyrrhotite, the lead-zinc-silver orebodies are concordant with carbonaceous dolomitic sediments and interfinger with the silica-dolomitic mass hosting copper. The CRM OREAS 131a was prepared from a blend of Black Star waste rock, Black Star ore and George Fisher ore.

Analyte Certified Value 1SD 95% Confidence Limits Low 95% Confidence Limits High Method
Zn, Zinc (wt.%) 2.83 0.080 2.79 2.88 4-Acid Digestion
Pb, Lead (wt.%) 1.72 0.049 1.69 1.75 4-Acid Digestion
Ag, Silver (ppm) 30.9 1.29 30.2 31.5 4-Acid Digestion
Al2O3, Aluminium(III) oxide (wt.%) 8.80 0.208 8.66 8.93 Borate / Peroxide Fusion ICP
As, Arsenic (ppm) 91 7.5 83 98 Borate / Peroxide Fusion ICP
Ba, Barium (ppm) 851 87 777 925 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 7.81 0.281 7.58 8.04 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 324 27 301 347 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 5.90 0.302 5.64 6.15 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 5.39 0.216 5.23 5.56 Borate / Peroxide Fusion ICP
Pb, Lead (wt.%) 1.74 0.064 1.70 1.79 Borate / Peroxide Fusion ICP
S, Sulphur (wt.%) 4.82 0.325 4.49 5.14 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 44.61 2.639 42.36 46.86 Borate / Peroxide Fusion ICP
Zn, Zinc (wt.%) 2.84 0.120 2.74 2.94 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 8.75 0.221 8.65 8.86 4-Acid Digestion
As, Arsenic (ppm) 82 6.9 78 86 4-Acid Digestion
Ba, Barium (ppm) 728 109 638 817 4-Acid Digestion
CaO, Calcium oxide (wt.%) 7.57 0.541 7.22 7.91 4-Acid Digestion
Cd, Cadmium (ppm) 81 5.5 78 85 4-Acid Digestion
Co, Cobalt (ppm) 23.1 3.7 21.1 25.1 4-Acid Digestion
Cu, Copper (ppm) 322 17 312 331 4-Acid Digestion
Fe, Iron (wt.%) 5.88 0.285 5.73 6.04 4-Acid Digestion
MgO, Magnesium oxide (wt.%) 5.17 0.297 5.00 5.34 4-Acid Digestion
S, Sulphur (wt.%) 4.80 0.250 4.61 5.00 4-Acid Digestion
Sb, Antimony (ppm) 47.0 5.8 43.6 50.3 4-Acid Digestion
Ag, Silver (ppm) 29.5 1.67 28.5 30.5 Aqua Regia Digestion
Al2O3, Aluminium(III) oxide (wt.%) 1.85 0.20 1.72 1.99 Aqua Regia Digestion
As, Arsenic (ppm) 82 6.7 78 86 Aqua Regia Digestion
CaO, Calcium oxide (wt.%) 7.34 0.250 7.16 7.51 Aqua Regia Digestion
Cd, Cadmium (ppm) 81 9 76 87 Aqua Regia Digestion
Co, Cobalt (ppm) 21.9 1.71 20.8 23.0 Aqua Regia Digestion
Cu, Copper (ppm) 329 22 317 342 Aqua Regia Digestion
Fe, Iron (wt.%) 5.68 0.241 5.53 5.83 Aqua Regia Digestion
MgO, Magnesium oxide (wt.%) 4.91 0.224 4.78 5.04 Aqua Regia Digestion
Pb, Lead (wt.%) 1.71 0.077 1.66 1.75 Aqua Regia Digestion
S, Sulphur (wt.%) 4.73 0.60 4.31 5.16 Aqua Regia Digestion
Sb, Antimony (ppm) 40.6 7.0 37.0 44.3 Aqua Regia Digestion
Zn, Zinc (wt.%) 2.79 0.155 2.70 2.87 Aqua Regia Digestion
S, Sulphur (wt.%) 4.66 0.163 4.55 4.77 Infrared Combustion
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Specifications