OREAS 75a

OREAS 75a (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.%) 5.11 0.210 5.00 5.22 4-Acid Digestion
Pt, Platinum (ppb) 353 25 338 368 Pb Fire Assay
Pd, Palladium (ppb) 280 15 272 288 Pb Fire Assay
Au, Gold (ppb) 34 9 29 39 Pb Fire Assay
Al2O3, Aluminium(III) oxide (wt.%) 1.99 0.090 1.95 2.04 Borate / Peroxide Fusion ICP
As, Arsenic (ppm) 80 19 67 93 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 894 15 888 900 Borate / Peroxide Fusion ICP
Cr, Chromium (ppm) 1552 56 1526 1577 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 2005 90 1943 2067 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 19.10 0.800 18.70 19.50 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 22.30 0.400 22.10 22.50 Borate / Peroxide Fusion ICP
Ni, Nickel (wt.%) 5.25 0.215 5.09 5.40 Borate / Peroxide Fusion ICP
S, Sulphur (wt.%) 12.80 0.900 11.20 14.40 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 27.30 0.800 27.00 27.70 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 1.98 0.110 1.91 2.06 4-Acid Digestion
As, Arsenic (ppm) 78 3.5 75 80 4-Acid Digestion
Co, Cobalt (ppm) 855 44 831 879 4-Acid Digestion
Cr, Chromium (ppm) 1122 237 959 1285 4-Acid Digestion
Cu, Copper (ppm) 1930 66 1895 1964 4-Acid Digestion
Fe, Iron (wt.%) 19.00 0.700 18.60 19.50 4-Acid Digestion
MgO, Magnesium oxide (wt.%) 22.60 1.000 22.00 23.20 4-Acid Digestion
S, Sulphur (wt.%) 12.60 0.750 12.00 13.10 4-Acid Digestion
S, Sulphur (wt.%) 12.50 0.450 12.30 12.80 Infrared Combustion
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Certificate DataPack SDS NRAM (223 KB)
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  • 10g Sachet
    $3.30
    7,000 +
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CRM Group