OREAS 76a
SKU: 76a
OREAS 76a (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.
Specifications
- State: primary
- Matrix: mineralised ultramafic
- Mineralisation: komatiite-hosted nickel sulphide
- CRM Group: Ni sulphide ore
Certified Values
| Analyte | Certified Value | 1SD | 95% CL Low | 95% CL High | Method |
|---|---|---|---|---|---|
| Ni, Nickel (wt.%) | 7.29 | 0.230 | 7.17 | 7.41 | 4-Acid Digestion |
| Pt, Platinum (ppb) | 701 | 48 | 674 | 727 | Pb Fire Assay |
| Pd, Palladium (ppb) | 403 | 17 | 392 | 414 | Pb Fire Assay |
| Au, Gold (ppb) | 41.0 | 4.50 | 38.0 | 44.0 | Pb Fire Assay |
| Al2O3, Aluminium(III) oxide (wt.%) | 1.78 | 0.090 | 1.73 | 1.83 | Borate / Peroxide Fusion ICP |
| As, Arsenic (ppm) | 117 | 29 | 102 | 132 | Borate / Peroxide Fusion ICP |
| Co, Cobalt (ppm) | 1215 | 30 | 1206 | 1225 | Borate / Peroxide Fusion ICP |
| Cr, Chromium (ppm) | 1283 | 41 | 1267 | 1299 | Borate / Peroxide Fusion ICP |
| Cu, Copper (ppm) | 2974 | 127 | 2881 | 3067 | Borate / Peroxide Fusion ICP |
| Fe, Iron (wt.%) | 24.60 | 0.800 | 24.20 | 25.00 | Borate / Peroxide Fusion ICP |
| MgO, Magnesium oxide (wt.%) | 16.50 | 0.400 | 16.30 | 16.70 | Borate / Peroxide Fusion ICP |
| Ni, Nickel (wt.%) | 7.40 | 0.260 | 7.23 | 7.58 | Borate / Peroxide Fusion ICP |
| S, Sulphur (wt.%) | 17.70 | 0.500 | 16.30 | 19.00 | Borate / Peroxide Fusion ICP |
| SiO2, Silicon dioxide (wt.%) | 21.70 | 0.470 | 21.50 | 22.00 | Borate / Peroxide Fusion ICP |
| Al2O3, Aluminium(III) oxide (wt.%) | 1.71 | 0.109 | 1.64 | 1.79 | 4-Acid Digestion |
| As, Arsenic (ppm) | 107 | 10 | 101 | 112 | 4-Acid Digestion |
| Co, Cobalt (ppm) | 1191 | 48 | 1164 | 1218 | 4-Acid Digestion |
| Cr, Chromium (ppm) | 872 | 191 | 730 | 1014 | 4-Acid Digestion |
| Cu, Copper (ppm) | 2848 | 73 | 2811 | 2885 | 4-Acid Digestion |
| Fe, Iron (wt.%) | 25.00 | 1.165 | 24.30 | 25.80 | 4-Acid Digestion |
| MgO, Magnesium oxide (wt.%) | 16.60 | 0.800 | 16.10 | 17.10 | 4-Acid Digestion |
| S, Sulphur (wt.%) | 17.20 | 2.10 | 15.60 | 18.80 | 4-Acid Digestion |
| S, Sulphur (wt.%) | 18.00 | 0.600 | 17.60 | 18.30 | Infrared Combustion |
Product Specifications
Certified Reference Values
| Analyte | Certified Value | Uncertainty (1SD) | 95% Confidence Low | 95% Confidence High | Method |
|---|
SD = Standard Deviation | CL = 95% Confidence Limits
Methods: AR = Aqua Regia, 4-Acid = 4-Acid Digestion, LBF = Lithium Borate Fusion, FA/AAS = Fire Assay with Atomic Absorption, LECO = LECO Combustion Analysis
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