OREAS 77a

OREAS 77a (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.%) 10.59 0.365 10.38 10.80 4-Acid Digestion
Pt, Platinum (ppb) 1088 96 1034 1142 Pb Fire Assay
Pd, Palladium (ppb) 566 45 538 593 Pb Fire Assay
Au, Gold (ppb) 61 8 57 66 Pb Fire Assay
Al2O3, Aluminium(III) oxide (wt.%) 1.48 0.105 1.43 1.54 Borate / Peroxide Fusion ICP
As, Arsenic (ppm) 162 28 146 179 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 1675 156 1578 1773 Borate / Peroxide Fusion ICP
Cr, Chromium (ppm) 840 52 812 868 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 4400 219 4247 4552 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 34.00 1.650 33.10 34.80 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 7.27 0.190 7.17 7.36 Borate / Peroxide Fusion ICP
Ni, Nickel (wt.%) 10.71 0.465 10.39 11.02 Borate / Peroxide Fusion ICP
S, Sulphur (wt.%) 26.20 0.700 24.20 28.20 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 13.30 0.550 13.10 13.60 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 1.45 0.060 1.40 1.49 4-Acid Digestion
As, Arsenic (ppm) 154 12 146 161 4-Acid Digestion
Co, Cobalt (ppm) 1714 77 1669 1760 4-Acid Digestion
Cr, Chromium (ppm) 709 63 661 757 4-Acid Digestion
Cu, Copper (ppm) 4311 144 4225 4397 4-Acid Digestion
Fe, Iron (wt.%) 34.30 1.550 33.30 35.40 4-Acid Digestion
MgO, Magnesium oxide (wt.%) 7.25 0.330 7.03 7.47 4-Acid Digestion
S, Sulphur (wt.%) 24.40 2.950 22.20 26.50 4-Acid Digestion
S, Sulphur (wt.%) 26.83 0.550 26.48 27.19 Infrared Combustion
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  • 10g Sachet
    $3.30
    9,400 +
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