OREAS 133b

OREAS 133b 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 133b 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.%) 11.35 0.347 11.15 11.54 4-Acid Digestion
Pb, Lead (wt.%) 5.06 0.098 5.00 5.12 4-Acid Digestion
Ag, Silver (ppm) 104 2 103 106 4-Acid Digestion
Al2O3, Aluminium(III) oxide (wt.%) 6.81 0.157 6.73 6.89 Borate / Peroxide Fusion ICP
Ba, Barium (ppm) 799 54 739 860 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 5.61 0.351 5.32 5.89 Borate / Peroxide Fusion ICP
Cd, Cadmium (ppm) 323 25 296 351 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 327 30 305 349 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 8.21 0.531 7.78 8.64 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 3.83 0.106 3.74 3.92 Borate / Peroxide Fusion ICP
Pb, Lead (wt.%) 5.20 0.226 5.03 5.38 Borate / Peroxide Fusion ICP
S, Sulphur (wt.%) 11.16 0.857 10.32 11.99 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 34.12 0.877 33.35 34.88 Borate / Peroxide Fusion ICP
Zn, Zinc (wt.%) 11.62 0.393 11.30 11.94 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 6.91 0.262 6.76 7.05 4-Acid Digestion
As, Arsenic (ppm) 144 13 140 149 4-Acid Digestion
CaO, Calcium oxide (wt.%) 5.40 0.267 5.23 5.56 4-Acid Digestion
Cd, Cadmium (ppm) 311 24 297 325 4-Acid Digestion
Co, Cobalt (ppm) 22.4 2.7 20.9 23.9 4-Acid Digestion
Cu, Copper (ppm) 320 14 313 327 4-Acid Digestion
Fe, Iron (wt.%) 8.16 0.345 7.96 8.36 4-Acid Digestion
MgO, Magnesium oxide (wt.%) 3.73 0.197 3.63 3.83 4-Acid Digestion
S, Sulphur (wt.%) 11.54 0.307 11.30 11.79 4-Acid Digestion
Sb, Antimony (ppm) 181 19 171 191 4-Acid Digestion
Ag, Silver (ppm) 100 6 97 104 Aqua Regia Digestion
Al2O3, Aluminium(III) oxide (wt.%) 1.33 0.126 1.25 1.42 Aqua Regia Digestion
As, Arsenic (ppm) 144 12 138 151 Aqua Regia Digestion
CaO, Calcium oxide (wt.%) 5.23 0.234 5.06 5.40 Aqua Regia Digestion
Cd, Cadmium (ppm) 303 25 288 318 Aqua Regia Digestion
Co, Cobalt (ppm) 22.9 2.25 21.5 24.3 Aqua Regia Digestion
Cu, Copper (ppm) 332 26 318 346 Aqua Regia Digestion
MgO, Magnesium oxide (wt.%) 3.45 0.254 3.31 3.60 Aqua Regia Digestion
Pb, Lead (wt.%) 5.07 0.202 4.94 5.21 Aqua Regia Digestion
S, Sulphur (wt.%) 11.10 0.899 10.42 11.78 Aqua Regia Digestion
Sb, Antimony (ppm) 155 30 139 171 Aqua Regia Digestion
Zn, Zinc (wt.%) 11.12 0.545 10.77 11.46 Aqua Regia Digestion
S, Sulphur (wt.%) 11.48 0.517 11.18 11.78 Infrared Combustion
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Information is provided for reference only.

Specifications