| Description: OREAS 74b is one of a suite of seven nickel sulphide CRMs prepared from high grade massive nickel sulphide ore and barren ultramafic material sourced from Xstrata Nickel's Prospero and Tapinos Nickel mines, located in the Kathleen Valley area approximately 30km north of Leinster in Western Australia within the Agnew-Wiluna portion of the Norseman-Wiluna greenstone belt. It is a typical komatiite-associated, massive sulphide deposit representing an in-situ accumulation of massive and semi-massive primary magmatic Ni-Fe sulphides with minor by-products including Cu, Co and platinum group elements (PGE's). Nineteen commercial analytical laboratories participated in the program employing the following methods: - Lithium borate fusion with X-ray fluorescence;
- Sodium peroxide fusion or lithium borate fusion with full ICP-OES and ICP-MS suites;
- Four acid digestion with full ICP-OES and ICP-MS suites;
- Infra-red combustion furnace for sulphur;
- Thermogravimetry for Loss On Ignition at 1000 degrees Celsius;
Due to the presence of reactive sulphides OREAS 74b has been packaged under nitrogen and is available in single-use 10g units in laminated foil pouches. Download Certificate OREAS74b Download DataPack OREAS74b | Analyte | Certified Value | 1SD | 95% CI Low | 95% CI High | Method |
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| Ag, Silver (ppm) | 0.568 | 0.044 | 0.543 | 0.593 | 4-Acid Digestion | | Al, Aluminium (wt.%) | 3.58 | 0.14 | 3.51 | 3.65 | 4-Acid Digestion | | As, Arsenic (ppm) | 603 | 56 | 573 | 633 | 4-Acid Digestion | | Ba, Barium (ppm) | 213 | 10 | 208 | 219 | 4-Acid Digestion | | Be, Beryllium (ppm) | 0.81 | 0.12 | 0.71 | 0.9 | 4-Acid Digestion | | Bi, Bismuth (ppm) | 1.35 | 0.085 | 1.32 | 1.39 | 4-Acid Digestion | | Ca, Calcium (wt.%) | 3.07 | 0.118 | 3 | 3.14 | 4-Acid Digestion | | Cd, Cadmium (ppm) | 0.6 | 0.1 | 0.56 | 0.64 | 4-Acid Digestion | | Ce, Cerium (ppm) | 33.5 | 1.75 | 32.4 | 34.7 | 4-Acid Digestion | | Co, Cobalt (ppm) | 490 | 24 | 477 | 502 | 4-Acid Digestion | | Cs, Caesium (ppm) | 2.97 | 0.152 | 2.85 | 3.08 | 4-Acid Digestion | | Cu, Copper (ppm) | 998 | 38 | 978 | 1018 | 4-Acid Digestion | | Fe, Iron (wt.%) | 12.32 | 0.679 | 11.96 | 12.67 | 4-Acid Digestion | | Ga, Gallium (ppm) | 9.03 | 0.659 | 8.52 | 9.53 | 4-Acid Digestion | | Hf, Hafnium (ppm) | 1.87 | 0.109 | 1.8 | 1.93 | 4-Acid Digestion | | In, Indium (ppm) | 0.067 | 0.004 | 0.063 | 0.07 | 4-Acid Digestion | | K, Potassium (wt.%) | 0.729 | 0.034 | 0.71 | 0.748 | 4-Acid Digestion | | La, Lanthanum (ppm) | 18.8 | 1.47 | 17.9 | 19.7 | 4-Acid Digestion | | Li, Lithium (ppm) | 27.7 | 2.15 | 26.4 | 29 | 4-Acid Digestion | | Mg, Magnesium (wt.%) | 9.31 | 0.441 | 9.07 | 9.55 | 4-Acid Digestion | | Mn, Manganese (wt.%) | 0.091 | 0.004 | 0.088 | 0.093 | 4-Acid Digestion | | Na, Sodium (wt.%) | 0.719 | 0.033 | 0.699 | 0.739 | 4-Acid Digestion | | Nb, Niobium (ppm) | 4.2 | 0.383 | 3.95 | 4.45 | 4-Acid Digestion | | Ni, Nickel (wt.%) | 3.38 | 0.093 | 3.33 | 3.43 | 4-Acid Digestion | | P, Phosphorus (wt.%) | 0.019 | 0.002 | 0.018 | 0.02 | 4-Acid Digestion | | Pb, Lead (ppm) | 24.9 | 2.24 | 23.6 | 26.3 | 4-Acid Digestion | | Rb, Rubidium (ppm) | 33.2 | 2.82 | 31.3 | 35 | 4-Acid Digestion | | Re, Rhenium (ppm) | 0.007 | 0.001 | 0.006 | 0.008 | 4-Acid Digestion | | Sb, Antimony (ppm) | 2.69 | 0.182 | 2.56 | 2.81 | 4-Acid Digestion | | Sc, Scandium (ppm) | 10.2 | 0.82 | 9.7 | 10.7 | 4-Acid Digestion | | Se, Selenium (ppm) | 4.64 | 0.56 | 4.23 | 5.05 | 4-Acid Digestion | | Sn, Tin (ppm) | 1.44 | 0.136 | 1.37 | 1.5 | 4-Acid Digestion | | Sr, Strontium (ppm) | 56 | 2.8 | 54 | 58 | 4-Acid Digestion | | Ta, Tantalum (ppm) | 0.33 | 0.031 | 0.32 | 0.35 | 4-Acid Digestion | | Te, Tellurium (ppm) | 0.38 | 0.04 | 0.35 | 0.42 | 4-Acid Digestion | | Th, Thorium (ppm) | 8.28 | 0.426 | 8.02 | 8.55 | 4-Acid Digestion | | Ti, Titanium (wt.%) | 0.156 | 0.007 | 0.152 | 0.161 | 4-Acid Digestion | | Tl, Thallium (ppm) | 0.59 | 0.033 | 0.57 | 0.61 | 4-Acid Digestion | | U, Uranium (ppm) | 2.45 | 0.161 | 2.35 | 2.54 | 4-Acid Digestion | | V, Vanadium (ppm) | 61 | 2.4 | 59 | 62 | 4-Acid Digestion | | W, Tungsten (ppm) | 4.75 | 0.61 | 4.43 | 5.08 | 4-Acid Digestion | | Y, Yttrium (ppm) | 9.93 | 0.58 | 9.56 | 10.3 | 4-Acid Digestion | | Zn, Zinc (ppm) | 136 | 10 | 132 | 141 | 4-Acid Digestion | | Zr, Zirconium (ppm) | 65 | 4.5 | 63 | 68 | 4-Acid Digestion | | Al, Aluminium (wt.%) | 3.54 | 0.132 | 3.46 | 3.61 | Borate / Peroxide Fusion ICP | | As, Arsenic (ppm) | 614 | 35 | 596 | 633 | Borate / Peroxide Fusion ICP | | Ba, Barium (ppm) | 210 | 7 | 205 | 216 | Borate / Peroxide Fusion ICP | | Ca, Calcium (wt.%) | 3.09 | 0.106 | 3.03 | 3.14 | Borate / Peroxide Fusion ICP | | Ce, Cerium (ppm) | 30.9 | 1.04 | 30 | 31.7 | Borate / Peroxide Fusion ICP | | Co, Cobalt (ppm) | 499 | 24 | 483 | 515 | Borate / Peroxide Fusion ICP | | Cr, Chromium (ppm) | 978 | 67 | 935 | 1021 | Borate / Peroxide Fusion ICP | | Cs, Caesium (ppm) | 2.73 | 0.239 | 2.51 | 2.94 | Borate / Peroxide Fusion ICP | | Cu, Copper (ppm) | 1021 | 95 | 962 | 1081 | Borate / Peroxide Fusion ICP | | Dy, Dysprosium (ppm) | 1.96 | 0.146 | 1.77 | 2.15 | Borate / Peroxide Fusion ICP | | Er, Erbium (ppm) | 1.18 | 0.088 | 1.09 | 1.27 | Borate / Peroxide Fusion ICP | | Eu, Europium (ppm) | 0.53 | 0.038 | 0.49 | 0.56 | Borate / Peroxide Fusion ICP | | Fe, Iron (wt.%) | 12.6 | 0.467 | 12.33 | 12.88 | Borate / Peroxide Fusion ICP | | Ga, Gallium (ppm) | 8.52 | 0.331 | 8.22 | 8.82 | Borate / Peroxide Fusion ICP | | Gd, Gadolinium (ppm) | 1.9 | 0.149 | 1.75 | 2.06 | Borate / Peroxide Fusion ICP | | Ho, Holmium (ppm) | 0.4 | 0.04 | 0.36 | 0.45 | Borate / Peroxide Fusion ICP | | K, Potassium (wt.%) | 0.718 | 0.051 | 0.683 | 0.753 | Borate / Peroxide Fusion ICP | | La, Lanthanum (ppm) | 17.4 | 0.75 | 16.6 | 18.3 | Borate / Peroxide Fusion ICP | | Li, Lithium (ppm) | 29.3 | 1.71 | 27.5 | 31.1 | Borate / Peroxide Fusion ICP | | Mg, Magnesium (wt.%) | 9.38 | 0.263 | 9.23 | 9.53 | Borate / Peroxide Fusion ICP | | Mn, Manganese (wt.%) | 0.093 | 0.003 | 0.092 | 0.094 | Borate / Peroxide Fusion ICP | | Nb, Niobium (ppm) | 3.56 | 0.266 | 3.31 | 3.82 | Borate / Peroxide Fusion ICP | | Nd, Neodymium (ppm) | 11.9 | 0.69 | 11.1 | 12.6 | Borate / Peroxide Fusion ICP | | Ni, Nickel (ppm) | 34286 | 1186 | 33631 | 34942 | Borate / Peroxide Fusion ICP | | Pb, Lead (ppm) | 24.1 | 2.5 | 22.2 | 26 | Borate / Peroxide Fusion ICP | | Pr, Praseodymium (ppm) | 3.39 | 0.26 | 3.07 | 3.71 | Borate / Peroxide Fusion ICP | | Rb, Rubidium (ppm) | 31.3 | 2.1 | 29.4 | 33.2 | Borate / Peroxide Fusion ICP | | S, Sulphur (wt.%) | 6.61 | 0.203 | 6.46 | 6.77 | Borate / Peroxide Fusion ICP | | Si, Silicon (wt.%) | 19.68 | 0.373 | 19.46 | 19.89 | Borate / Peroxide Fusion ICP | | Sm, Samarium (ppm) | 2.23 | 0.186 | 2.11 | 2.34 | Borate / Peroxide Fusion ICP | | Sr, Strontium (ppm) | 54 | 4.5 | 51 | 58 | Borate / Peroxide Fusion ICP | | Tb, Terbium (ppm) | 0.31 | 0.015 | 0.29 | 0.32 | Borate / Peroxide Fusion ICP | | Th, Thorium (ppm) | 7.6 | 0.493 | 7.2 | 8 | Borate / Peroxide Fusion ICP | | Ti, Titanium (wt.%) | 0.152 | 0.007 | 0.147 | 0.156 | Borate / Peroxide Fusion ICP | | Tl, Thallium (ppm) | 0.6 | 0.07 | 0.52 | 0.68 | Borate / Peroxide Fusion ICP | | Tm, Thulium (ppm) | 0.19 | 0.03 | 0.16 | 0.22 | Borate / Peroxide Fusion ICP | | U, Uranium (ppm) | 2.4 | 0.219 | 2.21 | 2.6 | Borate / Peroxide Fusion ICP | | V, Vanadium (ppm) | 62 | 11 | 53 | 71 | Borate / Peroxide Fusion ICP | | Y, Yttrium (ppm) | 11.3 | 0.71 | 10.8 | 11.8 | Borate / Peroxide Fusion ICP | | Yb, Ytterbium (ppm) | 1.23 | 0.17 | 1.05 | 1.4 | Borate / Peroxide Fusion ICP | | Zn, Zinc (ppm) | 133 | 11 | 125 | 141 | Borate / Peroxide Fusion ICP | | Zr, Zirconium (ppm) | 63 | 5.7 | 57 | 69 | Borate / Peroxide Fusion ICP | | Al, Aluminium (wt.%) | 3.55 | 0.048 | 3.52 | 3.59 | Borate Fusion XRF | | Ca, Calcium (wt.%) | 3.09 | 0.015 | 3.08 | 3.11 | Borate Fusion XRF | | Co, Cobalt (ppm) | 502 | 12 | 498 | 505 | Borate Fusion XRF | | Cr, Chromium (ppm) | 981 | 57 | 943 | 1018 | Borate Fusion XRF | | Cu, Copper (ppm) | 947 | 91 | 848 | 1046 | Borate Fusion XRF | | Fe, Iron (wt.%) | 12.4 | 0.18 | 12.27 | 12.53 | Borate Fusion XRF | | K, Potassium (wt.%) | 0.691 | 0.014 | 0.682 | 0.7 | Borate Fusion XRF | | Mg, Magnesium (wt.%) | 9.23 | 0.135 | 9.12 | 9.34 | Borate Fusion XRF | | Na, Sodium (wt.%) | 0.692 | 0.017 | 0.676 | 0.708 | Borate Fusion XRF | | Ni, Nickel (ppm) | 33933 | 932 | 33136 | 34729 | Borate Fusion XRF | | P, Phosphorus (wt.%) | 0.02 | 0.002 | 0.019 | 0.02 | Borate Fusion XRF | | Si, Silicon (wt.%) | 19.36 | 0.208 | 19.22 | 19.51 | Borate Fusion XRF | | Ti, Titanium (wt.%) | 0.155 | 0.003 | 0.155 | 0.156 | Borate Fusion XRF | | S, Sulphur (wt.%) | 6.57 | 0.161 | 6.48 | 6.65 | Infrared Combustion | | LOI1000, Loss On Ignition @1000°C (wt.%) | 6.63 | 0.338 | 6.36 | 6.89 | Thermogravimetry |
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