OREAS 134b

OREAS 134b 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 134b 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.%) 18.03 0.755 17.58 18.48 4-Acid Digestion
Pb, Lead (wt.%) 13.36 0.743 12.91 13.80 4-Acid Digestion
Ag, Silver (ppm) 209 9 204 213 4-Acid Digestion
Al2O3, Aluminium(III) oxide (wt.%) 2.24 0.094 2.16 2.31 Borate / Peroxide Fusion ICP
As, Arsenic (ppm) 224 24 201 248 Borate / Peroxide Fusion ICP
Ba, Barium (ppm) 1490 142 1337 1644 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 6.18 0.206 6.08 6.28 Borate / Peroxide Fusion ICP
Cd, Cadmium (ppm) 569 25 548 590 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 104 15 92 116 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 1337 73 1284 1391 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 12.69 0.575 12.22 13.15 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 3.45 0.174 3.33 3.58 Borate / Peroxide Fusion ICP
S, Sulphur (wt.%) 20.74 1.250 19.44 22.04 Borate / Peroxide Fusion ICP
Sb, Antimony (ppm) 111 13 93 129 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 12.98 0.837 12.33 13.63 Borate / Peroxide Fusion ICP
Zn, Zinc (wt.%) 18.12 0.473 17.79 18.45 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 2.21 0.092 2.15 2.26 4-Acid Digestion
As, Arsenic (ppm) 228 21 218 238 4-Acid Digestion
CaO, Calcium oxide (wt.%) 5.98 0.343 5.77 6.19 4-Acid Digestion
Cd, Cadmium (ppm) 561 34 540 581 4-Acid Digestion
Co, Cobalt (ppm) 107 8 103 112 4-Acid Digestion
Cu, Copper (ppm) 1348 50 1325 1370 4-Acid Digestion
Fe, Iron (wt.%) 12.37 0.623 12.06 12.68 4-Acid Digestion
MgO, Magnesium oxide (wt.%) 3.33 0.281 3.17 3.49 4-Acid Digestion
S, Sulphur (wt.%) 19.68 1.092 18.75 20.62 4-Acid Digestion
Sb, Antimony (ppm) 124 8 120 129 4-Acid Digestion
Ag, Silver (ppm) 204 14 196 213 Aqua Regia Digestion
Al2O3, Aluminium(III) oxide (wt.%) 0.712 0.077 0.661 0.764 Aqua Regia Digestion
As, Arsenic (ppm) 221 16 213 230 Aqua Regia Digestion
CaO, Calcium oxide (wt.%) 5.94 0.291 5.73 6.15 Aqua Regia Digestion
Cd, Cadmium (ppm) 563 36 542 585 Aqua Regia Digestion
Co, Cobalt (ppm) 106 6 103 110 Aqua Regia Digestion
Cu, Copper (ppm) 1363 64 1330 1397 Aqua Regia Digestion
Fe, Iron (wt.%) 12.25 0.929 11.71 12.80 Aqua Regia Digestion
Pb, Lead (wt.%) 13.31 0.663 12.85 13.78 Aqua Regia Digestion
S, Sulphur (wt.%) 19.31 1.505 18.05 20.56 Aqua Regia Digestion
Zn, Zinc (wt.%) 17.70 1.001 17.04 18.36 Aqua Regia Digestion
S, Sulphur (wt.%) 19.59 0.797 19.03 20.16 Infrared Combustion
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