OREAS 74a

OREAS 74a (10g units packaged under nitrogen) is one of a suite of six nickel sulphide CRMs (OREAS 72a to OREAS 77a) prepared from high grade massive nickel sulphide ore and barren ultramafic material from the Cosmos Nickel mine operated by Xstrata Nickel located in the Kathleen Valley area approximately 30km north of Leinster in Western Australia. Cosmos is situated within the Agnew-Wiluna portion of the Norseman-Wiluna greenstone belt. This portion of the belt is strongly attenuated and characterised by large scale faults, complex folding and typically steep dips. It is a typical Kambalda-style, komatiite associated, massive sulphide deposit representing an essentially in-situ accumulation of primary magmatic Ni-Fe sulphides with minor by-products including Cu, Co and platinum group elements (PGE’s). The Cosmos deposit comprises one discrete zone of massive and semi-massive sulphides extending over a strike length of 240m. Mineralisation is strata bound between the ovelying ultramafic unit and the underlying dolerite and felsic volcanic rocks. Continuity of grade and width of mineralisation are strong both along strike and down dip.

Analyte Certified Value 1SD 95% Confidence Low 95% Confidence High Method
Ni, Nickel (wt.%) 3.14 0.175 3.04 3.23 4-Acid Digestion
Pt, Platinum (ppb) 223 17 216 231 Pb Fire Assay
Pd, Palladium (ppb) 172 8 168 176 Pb Fire Assay
Au, Gold (ppb) 21 3 19 23 Pb Fire Assay
Al2O3, Aluminium(III) oxide (wt.%) 2.21 0.065 2.18 2.24 Borate / Peroxide Fusion ICP
As, Arsenic (ppm) 49.6 5.2 45.0 54.2 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 581 45 556 606 Borate / Peroxide Fusion ICP
Cr, Chromium (ppm) 1780 56 1745 1815 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 1240 54 1217 1263 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 13.70 0.450 13.50 14.00 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 27.90 0.600 27.60 28.30 Borate / Peroxide Fusion ICP
Ni, Nickel (wt.%) 3.24 0.195 3.12 3.37 Borate / Peroxide Fusion ICP
S, Sulphur (wt.%) 7.25 0.290 6.95 7.55 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 32.40 0.350 32.20 32.60 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 2.20 0.085 2.14 2.25 4-Acid Digestion
As, Arsenic (ppm) 49.6 5.5 47.2 52.0 4-Acid Digestion
Co, Cobalt (ppm) 554 25 541 567 4-Acid Digestion
Cr, Chromium (ppm) 1303 255 1130 1475 4-Acid Digestion
Cu, Copper (ppm) 1178 36 1160 1197 4-Acid Digestion
Fe, Iron (wt.%) 13.80 0.550 13.50 14.10 4-Acid Digestion
MgO, Magnesium oxide (wt.%) 28.10 1.350 27.30 28.90 4-Acid Digestion
S, Sulphur (wt.%) 7.73 0.380 7.44 8.01 4-Acid Digestion
S, Sulphur (wt.%) 7.48 0.415 7.25 7.71 Infrared Combustion
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  • 10g Sachet
    $3.15
    3,500 +
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CRM Group