OREAS 98

OREAS 98 is one of a suite of nine copper CRMs (OREAS 90 to OREAS 98) prepared from material from the CSA mine located near the town of Cobar in central western New South Wales, Australia. The copper ore body is hosted by the Early Devonian CSA Siltstone, a thinly bedded turbiditic sequence of carbonaceous siltstones and mudstones with minor coarser units. The CSA Siltstone is part of the Cobar Supergroup, consisting of lower syn-rift sediments and upper post-rift sag phase sediments. The mineralisation is structurally controlled and confined to a number of steeply dipping bodies within a major shear zone on the eastern margin of the Early Devonian Cobar Basin. It is characterised by low-grade greenschist alteration and epigenetic low-grade mineralisation enveloping higher-grade shoots of vein complexes or sub-massive to massive sulphides. The sulphides include chalcopyrite, pyrrhotite, pyrite, sphalerite, galena, bornite and cubanite. Iron-rich chlorite and silica are prominent alterations in the siltstone host.

Analyte Certified Value 1SD 95% Confidence Low 95% Confidence High Method
Cu, Copper (wt.%) 14.80 0.400 14.60 15.00 4-Acid Digestion
Ag, Silver (ppm) 45.1 1.65 44.1 46.1 4-Acid Digestion
S, Sulphur (wt.%) 16.00 0.550 15.60 16.30 Infrared Combustion
Bi, Bismuth (ppm) 97 5.7 93 102 4-Acid Digestion
Co, Cobalt (ppm) 121 10 115 126 4-Acid Digestion
Pb, Lead (ppm) 345 31 327 362 4-Acid Digestion
Sb, Antimony (ppm) 20.1 3.2 18.2 22.0 4-Acid Digestion
Se, Selenium (ppm) 158 20 146 170 4-Acid Digestion
Sn, Tin (ppm) 206 14 197 215 4-Acid Digestion
Zn, Zinc (ppm) 1355 150 1300 1409 4-Acid Digestion
Ag, Silver (ppm) 42.8 2.90 40.4 45.2 Aqua Regia Digestion
Bi, Bismuth (ppm) 93 11 88 98 Aqua Regia Digestion
Co, Cobalt (ppm) 111 13 103 119 Aqua Regia Digestion
Cu, Copper (wt.%) 14.70 0.500 14.40 15.00 Aqua Regia Digestion
Pb, Lead (ppm) 343 31 321 364 Aqua Regia Digestion
Sb, Antimony (ppm) 14.7 4.8 11.4 18.0 Aqua Regia Digestion
Se, Selenium (ppm) 143 22 128 158 Aqua Regia Digestion
Sn, Tin (ppm) 171 32 150 192 Aqua Regia Digestion
Zn, Zinc (ppm) 1302 106 1238 1367 Aqua Regia Digestion
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  • 10g Sachet
    $3.15
Specifications
CRM Group