OREAS 134a

OREAS 134a 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 134a 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.%) 17.27 0.553 16.95 17.59 4-Acid Digestion
Pb, Lead (wt.%) 12.79 0.766 12.34 13.23 4-Acid Digestion
Ag, Silver (ppm) 201 7 196 205 4-Acid Digestion
Ag, Silver (ppm) 197 10 186 209 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 2.60 0.131 2.49 2.71 Borate / Peroxide Fusion ICP
As, Arsenic (ppm) 218 22 196 239 Borate / Peroxide Fusion ICP
Ba, Barium (ppm) 1500 156 1334 1667 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 6.38 0.197 6.21 6.56 Borate / Peroxide Fusion ICP
Cd, Cadmium (ppm) 546 36 510 581 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 100 13 90 110 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 12.32 0.795 11.71 12.94 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 3.55 0.119 3.45 3.66 Borate / Peroxide Fusion ICP
Pb, Lead (wt.%) 12.95 0.623 12.49 13.40 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 14.81 0.845 14.10 15.53 Borate / Peroxide Fusion ICP
Zn, Zinc (wt.%) 17.49 0.505 17.10 17.88 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 2.53 0.117 2.46 2.61 4-Acid Digestion
As, Arsenic (ppm) 228 23 217 239 4-Acid Digestion
CaO, Calcium oxide (wt.%) 6.04 0.385 5.79 6.29 4-Acid Digestion
Cd, Cadmium (ppm) 536 36 514 557 4-Acid Digestion
Co, Cobalt (ppm) 105 8 100 110 4-Acid Digestion
Cu, Copper (ppm) 1291 45 1270 1311 4-Acid Digestion
Fe, Iron (wt.%) 12.04 0.410 11.83 12.25 4-Acid Digestion
MgO, Magnesium oxide (wt.%) 3.49 0.184 3.39 3.60 4-Acid Digestion
S, Sulphur (wt.%) 19.27 0.503 18.85 19.70 4-Acid Digestion
Sb, Antimony (ppm) 115 15 107 124 4-Acid Digestion
Ag, Silver (ppm) 194 13 186 202 Aqua Regia Digestion
Al2O3, Aluminium(III) oxide (wt.%) 0.774 0.085 0.714 0.833 Aqua Regia Digestion
As, Arsenic (ppm) 226 24 212 239 Aqua Regia Digestion
Cd, Cadmium (ppm) 547 44 520 573 Aqua Regia Digestion
Co, Cobalt (ppm) 101 8 96 106 Aqua Regia Digestion
Cu, Copper (ppm) 1279 78 1231 1328 Aqua Regia Digestion
Fe, Iron (wt.%) 11.89 0.973 11.30 12.48 Aqua Regia Digestion
MgO, Magnesium oxide (wt.%) 3.43 0.137 3.33 3.52 Aqua Regia Digestion
Pb, Lead (wt.%) 12.64 0.759 12.11 13.17 Aqua Regia Digestion
S, Sulphur (wt.%) 18.49 1.329 17.35 19.63 Aqua Regia Digestion
Zn, Zinc (wt.%) 17.00 0.863 16.44 17.56 Aqua Regia Digestion
S, Sulphur (wt.%) 19.11 0.413 18.81 19.42 Infrared Combustion
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