OREAS 73b

OREAS 73b 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 73b 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.%) 1.48 0.035 1.46 1.50 4-Acid Digestion
Co, Cobalt (ppm) 240 10 235 245 4-Acid Digestion
As, Arsenic (ppm) 293 24 281 305 4-Acid Digestion
Al, Aluminium (wt.%) 3.77 0.039 3.74 3.80 Borate Fusion XRF
Ca, Calcium (wt.%) 3.15 0.023 3.14 3.17 Borate Fusion XRF
Co, Cobalt (ppm) 246 33 215 278 Borate Fusion XRF
Cr, Chromium (ppm) 1172 61 1124 1220 Borate Fusion XRF
Cu, Copper (ppm) 430 49 377 482 Borate Fusion XRF
Fe, Iron (wt.%) 8.63 0.098 8.54 8.72 Borate Fusion XRF
K, Potassium (wt.%) 0.586 0.011 0.575 0.596 Borate Fusion XRF
Mg, Magnesium (wt.%) 11.80 0.119 11.69 11.91 Borate Fusion XRF
Mn, Manganese (wt.%) 0.115 0.003 0.113 0.118 Borate Fusion XRF
Na, Sodium (wt.%) 0.736 0.015 0.723 0.750 Borate Fusion XRF
Ni, Nickel (ppm) 15044 265 14764 15325 Borate Fusion XRF
P, Phosphorus (wt.%) 0.024 0.002 0.023 0.025 Borate Fusion XRF
Si, Silicon (wt.%) 20.89 0.172 20.75 21.04 Borate Fusion XRF
Ti, Titanium (wt.%) 0.191 0.004 0.187 0.194 Borate Fusion XRF
Al, Aluminium (wt.%) 3.77 0.123 3.70 3.83 Borate / Peroxide Fusion ICP
As, Arsenic (ppm) 301 20 291 311 Borate / Peroxide Fusion ICP
Ba, Barium (ppm) 208 13 198 217 Borate / Peroxide Fusion ICP
Ca, Calcium (wt.%) 3.15 0.126 3.08 3.21 Borate / Peroxide Fusion ICP
Ce, Cerium (ppm) 28.9 2.05 27.5 30.3 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 252 16 243 262 Borate / Peroxide Fusion ICP
Cr, Chromium (ppm) 1174 59 1135 1213 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) 2.81 0.233 2.60 3.02 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 439 30 420 459 Borate / Peroxide Fusion ICP
Dy, Dysprosium (ppm) 2.14 0.192 1.94 2.35 Borate / Peroxide Fusion ICP
Er, Erbium (ppm) 1.31 0.130 1.17 1.44 Borate / Peroxide Fusion ICP
Eu, Europium (ppm) 0.62 0.047 0.58 0.66 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 8.74 0.282 8.57 8.91 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 8.85 0.249 8.64 9.06 Borate / Peroxide Fusion ICP
Ho, Holmium (ppm) 0.45 0.05 0.39 0.50 Borate / Peroxide Fusion ICP
K, Potassium (wt.%) 0.614 0.050 0.580 0.648 Borate / Peroxide Fusion ICP
La, Lanthanum (ppm) 15.6 0.81 14.8 16.5 Borate / Peroxide Fusion ICP
Mg, Magnesium (wt.%) 11.88 0.298 11.71 12.05 Borate / Peroxide Fusion ICP
Mn, Manganese (wt.%) 0.116 0.003 0.115 0.117 Borate / Peroxide Fusion ICP
Nb, Niobium (ppm) 3.63 0.287 3.30 3.95 Borate / Peroxide Fusion ICP
Nd, Neodymium (ppm) 11.9 0.83 10.9 12.9 Borate / Peroxide Fusion ICP
Ni, Nickel (ppm) 14987 449 14728 15245 Borate / Peroxide Fusion ICP
P, Phosphorus (wt.%) 0.026 0.003 0.023 0.030 Borate / Peroxide Fusion ICP
Pb, Lead (ppm) 16.0 2.3 13.8 18.1 Borate / Peroxide Fusion ICP
Pr, Praseodymium (ppm) 3.37 0.36 2.98 3.76 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 31.0 2.28 28.9 33.1 Borate / Peroxide Fusion ICP
S, Sulphur (wt.%) 2.90 0.146 2.81 3.00 Borate / Peroxide Fusion ICP
Si, Silicon (wt.%) 21.08 0.456 20.83 21.34 Borate / Peroxide Fusion ICP
Sm, Samarium (ppm) 2.22 0.122 2.11 2.33 Borate / Peroxide Fusion ICP
Sr, Strontium (ppm) 65 4.1 62 69 Borate / Peroxide Fusion ICP
Tb, Terbium (ppm) 0.36 0.035 0.32 0.39 Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 6.38 0.450 6.07 6.70 Borate / Peroxide Fusion ICP
Ti, Titanium (wt.%) 0.187 0.008 0.181 0.192 Borate / Peroxide Fusion ICP
Tm, Thulium (ppm) 0.19 0.009 0.19 0.20 Borate / Peroxide Fusion ICP
U, Uranium (ppm) 2.11 0.25 1.90 2.31 Borate / Peroxide Fusion ICP
V, Vanadium (ppm) 73 6.7 68 79 Borate / Peroxide Fusion ICP
Y, Yttrium (ppm) 11.7 0.53 11.3 12.1 Borate / Peroxide Fusion ICP
Yb, Ytterbium (ppm) 1.21 0.107 1.09 1.33 Borate / Peroxide Fusion ICP
Zn, Zinc (ppm) 112 12 103 121 Borate / Peroxide Fusion ICP
Zr, Zirconium (ppm) 61 7 53 68 Borate / Peroxide Fusion ICP
Ag, Silver (ppm) 0.371 0.046 0.347 0.395 4-Acid Digestion
Al, Aluminium (wt.%) 3.87 0.155 3.80 3.95 4-Acid Digestion
Ba, Barium (ppm) 205 10 200 211 4-Acid Digestion
Bi, Bismuth (ppm) 1.13 0.15 1.07 1.19 4-Acid Digestion
Ca, Calcium (wt.%) 3.16 0.124 3.09 3.23 4-Acid Digestion
Cd, Cadmium (ppm) 0.41 0.04 0.39 0.43 4-Acid Digestion
Ce, Cerium (ppm) 29.6 2.23 28.2 30.9 4-Acid Digestion
Cs, Caesium (ppm) 3.02 0.171 2.90 3.13 4-Acid Digestion
Cu, Copper (ppm) 447 18 439 456 4-Acid Digestion
Fe, Iron (wt.%) 8.62 0.440 8.39 8.84 4-Acid Digestion
Ga, Gallium (ppm) 9.34 0.735 8.79 9.89 4-Acid Digestion
Hf, Hafnium (ppm) 1.73 0.100 1.66 1.81 4-Acid Digestion
In, Indium (ppm) 0.058 0.005 0.053 0.063 4-Acid Digestion
K, Potassium (wt.%) 0.621 0.030 0.605 0.637 4-Acid Digestion
La, Lanthanum (ppm) 16.6 1.24 15.9 17.4 4-Acid Digestion
Li, Lithium (ppm) 27.2 2.06 26.0 28.3 4-Acid Digestion
Mg, Magnesium (wt.%) 11.72 0.575 11.41 12.03 4-Acid Digestion
Mn, Manganese (wt.%) 0.116 0.003 0.115 0.118 4-Acid Digestion
Na, Sodium (wt.%) 0.782 0.041 0.759 0.806 4-Acid Digestion
Nb, Niobium (ppm) 4.13 0.326 3.95 4.32 4-Acid Digestion
P, Phosphorus (wt.%) 0.023 0.002 0.022 0.024 4-Acid Digestion
Pb, Lead (ppm) 17.2 1.65 16.3 18.1 4-Acid Digestion
Rb, Rubidium (ppm) 32.6 3.13 30.7 34.5 4-Acid Digestion
S, Sulphur (wt.%) 2.94 0.269 2.78 3.09 4-Acid Digestion
Sb, Antimony (ppm) 1.33 0.14 1.25 1.40 4-Acid Digestion
Sc, Scandium (ppm) 12.7 1.07 12.0 13.4 4-Acid Digestion
Sn, Tin (ppm) 1.28 0.18 1.17 1.40 4-Acid Digestion
Sr, Strontium (ppm) 69 3.7 66 71 4-Acid Digestion
Ta, Tantalum (ppm) 0.31 0.031 0.30 0.33 4-Acid Digestion
Th, Thorium (ppm) 6.94 0.337 6.75 7.13 4-Acid Digestion
Ti, Titanium (wt.%) 0.192 0.008 0.188 0.197 4-Acid Digestion
Tl, Thallium (ppm) 0.41 0.037 0.39 0.43 4-Acid Digestion
U, Uranium (ppm) 2.10 0.138 2.01 2.19 4-Acid Digestion
V, Vanadium (ppm) 74 3.8 72 76 4-Acid Digestion
W, Tungsten (ppm) 4.62 0.434 4.45 4.80 4-Acid Digestion
Y, Yttrium (ppm) 10.9 0.53 10.6 11.2 4-Acid Digestion
Zn, Zinc (ppm) 114 5 111 116 4-Acid Digestion
Zr, Zirconium (ppm) 64 5.0 61 67 4-Acid Digestion
S, Sulphur (wt.%) 2.90 0.077 2.85 2.94 Infrared Combustion
LOI1000, Loss On Ignition @1000 °C (wt.%) 6.43 0.278 6.20 6.66 Thermogravimetry
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