OREAS 133a

OREAS 133a 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 133a was prepared from a blend of Black Star waste rock, Black Star ore and George Fisher ore.

Analyte Certified Value 1SD 95% Confidence Low 95% Confidence High Method
Zn, Zinc (wt.%) 10.87 0.354 10.68 11.07 4-Acid Digestion
Pb, Lead (wt.%) 4.90 0.162 4.81 4.99 4-Acid Digestion
Ag, Silver (ppm) 99.9 2.42 98.4 101.5 4-Acid Digestion
Al2O3, Aluminium(III) oxide (wt.%) 6.80 0.143 6.68 6.92 Borate / Peroxide Fusion ICP
Ba, Barium (ppm) 785 64 722 847 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 5.67 0.266 5.45 5.89 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 302 14 291 313 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 7.92 0.503 7.52 8.32 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 3.85 0.154 3.73 3.97 Borate / Peroxide Fusion ICP
Pb, Lead (wt.%) 4.84 0.254 4.65 5.04 Borate / Peroxide Fusion ICP
S, Sulphur (wt.%) 10.82 0.921 10.32 11.32 Borate / Peroxide Fusion ICP
Sb, Antimony (ppm) 175 34 129 221 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 34.36 1.500 33.14 35.58 Borate / Peroxide Fusion ICP
Zn, Zinc (wt.%) 10.67 0.281 10.44 10.89 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 7.11 0.272 6.95 7.26 4-Acid Digestion
As, Arsenic (ppm) 139 15 131 147 4-Acid Digestion
CaO, Calcium oxide (wt.%) 5.50 0.298 5.32 5.69 4-Acid Digestion
Cd, Cadmium (ppm) 296 23 284 309 4-Acid Digestion
Co, Cobalt (ppm) 23.9 4.4 21.6 26.1 4-Acid Digestion
Cu, Copper (ppm) 323 15 315 331 4-Acid Digestion
Fe, Iron (wt.%) 8.10 0.251 7.97 8.23 4-Acid Digestion
MgO, Magnesium oxide (wt.%) 3.80 0.186 3.69 3.91 4-Acid Digestion
S, Sulphur (wt.%) 11.13 0.316 10.82 11.44 4-Acid Digestion
Sb, Antimony (ppm) 171 18 161 180 4-Acid Digestion
Ag, Silver (ppm) 96.9 5.72 93.6 100.3 Aqua Regia Digestion
Al2O3, Aluminium(III) oxide (wt.%) 1.39 0.132 1.30 1.48 Aqua Regia Digestion
As, Arsenic (ppm) 140 15 132 148 Aqua Regia Digestion
CaO, Calcium oxide (wt.%) 5.39 0.247 5.21 5.56 Aqua Regia Digestion
Cd, Cadmium (ppm) 297 16 287 307 Aqua Regia Digestion
Co, Cobalt (ppm) 23.3 2.11 22.1 24.5 Aqua Regia Digestion
Cu, Copper (ppm) 324 19 313 335 Aqua Regia Digestion
Fe, Iron (wt.%) 7.92 0.287 7.72 8.11 Aqua Regia Digestion
MgO, Magnesium oxide (wt.%) 3.56 0.240 3.41 3.70 Aqua Regia Digestion
Pb, Lead (wt.%) 4.86 0.203 4.76 4.97 Aqua Regia Digestion
S, Sulphur (wt.%) 10.73 0.928 10.06 11.40 Aqua Regia Digestion
Sb, Antimony (ppm) 147 28 131 162 Aqua Regia Digestion
Zn, Zinc (wt.%) 10.60 0.596 10.27 10.93 Aqua Regia Digestion
S, Sulphur (wt.%) 10.95 0.256 10.76 11.15 Infrared Combustion
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Specifications
CRM Group