OREAS 73a

OREAS 73a (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 Limits Low 95% Confidence Limits High Method
Ni, Nickel (wt.%) 1.41 0.020 1.40 1.42 4-Acid Digestion
Pt, Platinum (ppb) 64.0 6.5 60.0 68.0 Pb Fire Assay
Pd, Palladium (ppb) 78.0 5.0 75.0 81.0 Pb Fire Assay
Au, Gold (ppb) 14.0 2.50 12.0 15.0 Pb Fire Assay
Al2O3, Aluminium(III) oxide (wt.%) 2.38 0.095 2.32 2.44 Borate / Peroxide Fusion ICP
As, Arsenic (ppm) 26.3 9.0 19.7 32.9 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 302 17 292 313 Borate / Peroxide Fusion ICP
Cr, Chromium (ppm) 1987 76 1948 2026 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 915 81 861 970 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 9.24 0.150 9.18 9.30 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 32.50 0.900 32.00 33.00 Borate / Peroxide Fusion ICP
Ni, Nickel (wt.%) 1.44 0.060 1.39 1.48 Borate / Peroxide Fusion ICP
S, Sulphur (wt.%) 3.02 0.075 2.91 3.13 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 36.40 0.900 35.80 36.90 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 2.42 0.085 2.36 2.47 4-Acid Digestion
As, Arsenic (ppm) 24.8 5.9 20.9 28.6 4-Acid Digestion
Co, Cobalt (ppm) 286 9 282 291 4-Acid Digestion
Cr, Chromium (ppm) 1668 247 1494 1843 4-Acid Digestion
Cu, Copper (ppm) 877 25 864 890 4-Acid Digestion
Fe, Iron (wt.%) 9.20 0.285 9.03 9.38 4-Acid Digestion
MgO, Magnesium oxide (wt.%) 32.60 1.400 31.70 33.60 4-Acid Digestion
S, Sulphur (wt.%) 3.31 0.240 3.13 3.50 4-Acid Digestion
S, Sulphur (wt.%) 3.16 0.135 3.09 3.24 Infrared Combustion
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Certificate DataPack SDS NRAM (412 KB)
Archived

This CRM is no longer available.
Information is provided for reference only.

Specifications