OREAS 77b

OREAS 77b 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 77b has been packaged under nitrogen and is available in single-use 10g units in laminated foil pouches.

Analyte Certified Value 1SD 95% Confidence Limits Low 95% Confidence Limits High Method
Ni, Nickel (wt.%) 11.30 0.301 11.15 11.46 4-Acid Digestion
Co, Cobalt (ppm) 1551 56 1523 1580 4-Acid Digestion
As, Arsenic (ppm) 2054 124 1980 2127 4-Acid Digestion
Al, Aluminium (wt.%) 1.86 0.024 1.84 1.88 Borate Fusion XRF
Ca, Calcium (wt.%) 3.11 0.016 3.10 3.13 Borate Fusion XRF
Co, Cobalt (ppm) 1604 37 1581 1627 Borate Fusion XRF
Cr, Chromium (ppm) 341 36 311 371 Borate Fusion XRF
Cu, Copper (ppm) 3163 217 2875 3452 Borate Fusion XRF
Fe, Iron (wt.%) 29.21 0.506 28.79 29.63 Borate Fusion XRF
K, Potassium (wt.%) 0.344 0.014 0.335 0.353 Borate Fusion XRF
Mg, Magnesium (wt.%) 2.67 0.045 2.62 2.71 Borate Fusion XRF
Mn, Manganese (wt.%) 0.068 0.002 0.066 0.070 Borate Fusion XRF
Na, Sodium (wt.%) 0.406 0.040 0.363 0.450 Borate Fusion XRF
Ni, Nickel (ppm) 112435 1874 110585 114284 Borate Fusion XRF
Si, Silicon (wt.%) 9.24 0.095 9.17 9.32 Borate Fusion XRF
Ti, Titanium (wt.%) 0.065 0.002 0.064 0.067 Borate Fusion XRF
Al, Aluminium (wt.%) 1.84 0.090 1.79 1.90 Borate / Peroxide Fusion ICP
As, Arsenic (ppm) 2083 116 2014 2152 Borate / Peroxide Fusion ICP
Ba, Barium (ppm) 124 10 116 132 Borate / Peroxide Fusion ICP
Bi, Bismuth (ppm) 3.39 0.55 2.79 4.00 Borate / Peroxide Fusion ICP
Ca, Calcium (wt.%) 3.09 0.130 3.02 3.15 Borate / Peroxide Fusion ICP
Ce, Cerium (ppm) 25.7 1.18 25.0 26.5 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 1608 61 1570 1647 Borate / Peroxide Fusion ICP
Cr, Chromium (ppm) 336 33 320 351 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) 2.18 0.207 1.99 2.37 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 3302 176 3191 3412 Borate / Peroxide Fusion ICP
Dy, Dysprosium (ppm) 1.33 0.115 1.20 1.46 Borate / Peroxide Fusion ICP
Er, Erbium (ppm) 0.81 0.10 0.73 0.90 Borate / Peroxide Fusion ICP
Eu, Europium (ppm) 0.38 0.06 0.34 0.43 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 29.81 0.622 29.42 30.21 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 4.48 0.86 3.66 5.29 Borate / Peroxide Fusion ICP
Gd, Gadolinium (ppm) 1.51 0.23 1.28 1.75 Borate / Peroxide Fusion ICP
Ho, Holmium (ppm) 0.27 0.03 0.25 0.30 Borate / Peroxide Fusion ICP
K, Potassium (wt.%) 0.369 0.051 0.332 0.405 Borate / Peroxide Fusion ICP
La, Lanthanum (ppm) 15.4 1.48 13.8 17.0 Borate / Peroxide Fusion ICP
Li, Lithium (ppm) 20.4 1.34 19.4 21.4 Borate / Peroxide Fusion ICP
Mg, Magnesium (wt.%) 2.65 0.106 2.59 2.71 Borate / Peroxide Fusion ICP
Mn, Manganese (wt.%) 0.067 0.004 0.065 0.070 Borate / Peroxide Fusion ICP
Nd, Neodymium (ppm) 9.40 0.653 8.68 10.13 Borate / Peroxide Fusion ICP
Ni, Nickel (ppm) 113273 4129 110509 116038 Borate / Peroxide Fusion ICP
Pb, Lead (ppm) 58 5.2 53 63 Borate / Peroxide Fusion ICP
Pr, Praseodymium (ppm) 2.89 0.31 2.57 3.22 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 18.3 0.98 17.4 19.2 Borate / Peroxide Fusion ICP
S, Sulphur (wt.%) 22.22 0.720 21.62 22.81 Borate / Peroxide Fusion ICP
Sb, Antimony (ppm) 8.23 1.09 7.06 9.41 Borate / Peroxide Fusion ICP
Si, Silicon (wt.%) 9.49 0.188 9.38 9.59 Borate / Peroxide Fusion ICP
Sm, Samarium (ppm) 1.66 0.18 1.51 1.82 Borate / Peroxide Fusion ICP
Sr, Strontium (ppm) 33.7 4.2 30.1 37.2 Borate / Peroxide Fusion ICP
Tb, Terbium (ppm) 0.24 0.04 0.21 0.26 Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 6.14 0.356 5.88 6.41 Borate / Peroxide Fusion ICP
Ti, Titanium (wt.%) 0.062 0.003 0.060 0.064 Borate / Peroxide Fusion ICP
U, Uranium (ppm) 1.72 0.30 1.47 1.97 Borate / Peroxide Fusion ICP
W, Tungsten (ppm) 2.67 0.48 2.26 3.08 Borate / Peroxide Fusion ICP
Y, Yttrium (ppm) 7.15 0.657 6.72 7.58 Borate / Peroxide Fusion ICP
Yb, Ytterbium (ppm) 0.80 0.13 0.66 0.94 Borate / Peroxide Fusion ICP
Zn, Zinc (ppm) 202 20 187 217 Borate / Peroxide Fusion ICP
Zr, Zirconium (ppm) 32.8 3.9 28.4 37.1 Borate / Peroxide Fusion ICP
Ag, Silver (ppm) 1.62 0.16 1.50 1.73 4-Acid Digestion
Al, Aluminium (wt.%) 1.94 0.106 1.88 2.00 4-Acid Digestion
Ba, Barium (ppm) 118 8 112 123 4-Acid Digestion
Be, Beryllium (ppm) 0.47 0.07 0.43 0.51 4-Acid Digestion
Bi, Bismuth (ppm) 3.44 0.146 3.36 3.51 4-Acid Digestion
Ca, Calcium (wt.%) 3.06 0.094 3.00 3.12 4-Acid Digestion
Cd, Cadmium (ppm) 1.20 0.14 1.10 1.29 4-Acid Digestion
Ce, Cerium (ppm) 27.7 2.9 25.7 29.7 4-Acid Digestion
Cr, Chromium (ppm) 280 34 261 299 4-Acid Digestion
Cs, Caesium (ppm) 2.32 0.083 2.27 2.37 4-Acid Digestion
Cu, Copper (ppm) 3426 120 3367 3484 4-Acid Digestion
Fe, Iron (wt.%) 29.85 0.966 29.38 30.32 4-Acid Digestion
Ga, Gallium (ppm) 4.61 0.294 4.40 4.82 4-Acid Digestion
Hf, Hafnium (ppm) 1.15 0.073 1.11 1.19 4-Acid Digestion
In, Indium (ppm) 0.11 0.01 0.10 0.12 4-Acid Digestion
K, Potassium (wt.%) 0.361 0.012 0.355 0.367 4-Acid Digestion
La, Lanthanum (ppm) 15.8 2.0 14.6 17.1 4-Acid Digestion
Li, Lithium (ppm) 18.8 1.71 17.7 19.9 4-Acid Digestion
Mg, Magnesium (wt.%) 2.59 0.099 2.54 2.65 4-Acid Digestion
Mn, Manganese (wt.%) 0.064 0.002 0.063 0.066 4-Acid Digestion
Na, Sodium (wt.%) 0.434 0.019 0.423 0.445 4-Acid Digestion
Nb, Niobium (ppm) 3.26 0.40 2.98 3.54 4-Acid Digestion
Pb, Lead (ppm) 61 5.2 58 64 4-Acid Digestion
Rb, Rubidium (ppm) 19.1 1.41 18.2 20.0 4-Acid Digestion
Re, Rhenium (ppm) 0.022 0.002 0.020 0.023 4-Acid Digestion
Sb, Antimony (ppm) 9.10 0.95 8.48 9.72 4-Acid Digestion
Sc, Scandium (ppm) 3.51 0.42 3.25 3.78 4-Acid Digestion
Sn, Tin (ppm) 1.59 0.147 1.50 1.69 4-Acid Digestion
Sr, Strontium (ppm) 34.4 1.57 33.3 35.4 4-Acid Digestion
Ta, Tantalum (ppm) 0.28 0.04 0.26 0.30 4-Acid Digestion
Te, Tellurium (ppm) 1.35 0.27 1.15 1.55 4-Acid Digestion
Th, Thorium (ppm) 6.61 0.311 6.40 6.82 4-Acid Digestion
Ti, Titanium (wt.%) 0.064 0.002 0.062 0.065 4-Acid Digestion
Tl, Thallium (ppm) 1.37 0.074 1.33 1.42 4-Acid Digestion
U, Uranium (ppm) 1.71 0.087 1.66 1.77 4-Acid Digestion
V, Vanadium (ppm) 33.6 2.92 32.4 34.8 4-Acid Digestion
W, Tungsten (ppm) 3.07 0.194 2.99 3.16 4-Acid Digestion
Y, Yttrium (ppm) 6.55 0.390 6.28 6.83 4-Acid Digestion
Zn, Zinc (ppm) 205 18 194 216 4-Acid Digestion
Zr, Zirconium (ppm) 37.9 2.43 36.4 39.5 4-Acid Digestion
S, Sulphur (wt.%) 22.29 0.850 21.76 22.82 Infrared Combustion
LOI1000, Loss On Ignition @1000 °C (wt.%) 8.87 0.154 8.73 9.01 Thermogravimetry
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