OREAS 45d

OREAS 45d was prepared from a 50:50 blend of mineralised lateritic soil and barren ferruginous soil. The lateritic soil was developed over a Ni-Cu-PGE mineralised contact between gabbro and pyroxenite in a layered mafic intrusive from the Southern Murchison region of Western Australia. It contains anomalous precious and base metal values. The barren soil was taken from a layer of mature soil developed in situ over early Tertiary tholeiitic basalt in outer eastern Melbourne, Victoria, Australia.

Twenty commercial analytical laboratories participated in the program to characterise the elements reported below. The following methods were employed:

  • Lithium borate fusion for full suite X-ray fluorescence (14 laboratories)
  • Sodium peroxide fusion or lithium borate fusion for full suite ICP-OES and ICP-MS (18 laboratories)
  • Four acid digestion for full suite ICP-OES and ICP-MS (20 laboratories)
  • Aqua regia digestion for full suite ICP-OES and ICP-MS (18 laboratories)
  • Fire assay with ICP-OES and ICP-MS for Au, Pd and Pt (Au: 20 laboratories; Pd and Pt: 19 laboratories)
  • Instrumental neutron activation analysis for Au on 1g subsamples to confirm homogeneity (1 laboratory)
  • Infra-red combustion furnace for C and S (15 laboratories)
  • Thermogravimetry for LOI (17 laboratories)
Analyte Certified Value 1SD 95% Confidence Limits Low 95% Confidence Limits High Method
Au, Gold (ppb) 23 2.0 22 24 Pb Fire Assay
Ni, Nickel (ppm) 231 13 225 236 4-Acid Digestion
Cu, Copper (ppm) 371 13 366 377 4-Acid Digestion
Al, Aluminium (wt.%) 8.15 0.253 8.02 8.28 4-Acid Digestion
As, Arsenic (ppm) 13.8 0.86 13.5 14.1 4-Acid Digestion
Ba, Barium (ppm) 183 10 179 187 4-Acid Digestion
Be, Beryllium (ppm) 0.79 0.11 0.73 0.86 4-Acid Digestion
Bi, Bismuth (ppm) 0.31 0.03 0.29 0.33 4-Acid Digestion
Ca, Calcium (wt.%) 0.185 0.015 0.179 0.192 4-Acid Digestion
Ce, Cerium (ppm) 37.2 3.06 35.3 39.0 4-Acid Digestion
Co, Cobalt (ppm) 29.5 1.61 28.7 30.2 4-Acid Digestion
Cr, Chromium (ppm) 549 33 531 566 4-Acid Digestion
Cs, Caesium (ppm) 3.91 0.299 3.72 4.10 4-Acid Digestion
Dy, Dysprosium (ppm) 2.26 0.210 2.05 2.48 4-Acid Digestion
Er, Erbium (ppm) 1.38 0.105 1.26 1.49 4-Acid Digestion
Eu, Europium (ppm) 0.57 0.09 0.48 0.66 4-Acid Digestion
Fe, Iron (wt.%) 14.52 0.782 14.13 14.90 4-Acid Digestion
Ga, Gallium (ppm) 21.2 1.01 20.7 21.7 4-Acid Digestion
Gd, Gadolinium (ppm) 2.42 0.26 2.07 2.76 4-Acid Digestion
Hf, Hafnium (ppm) 3.83 0.164 3.73 3.92 4-Acid Digestion
Ho, Holmium (ppm) 0.46 0.05 0.39 0.52 4-Acid Digestion
In, Indium (ppm) 0.096 0.007 0.092 0.100 4-Acid Digestion
K, Potassium (wt.%) 0.412 0.017 0.405 0.419 4-Acid Digestion
La, Lanthanum (ppm) 16.9 2.2 15.7 18.1 4-Acid Digestion
Li, Lithium (ppm) 21.5 1.03 21.1 21.9 4-Acid Digestion
Lu, Lutetium (ppm) 0.18 0.03 0.15 0.21 4-Acid Digestion
Mg, Magnesium (wt.%) 0.245 0.016 0.237 0.252 4-Acid Digestion
Mn, Manganese (wt.%) 0.049 0.003 0.048 0.051 4-Acid Digestion
Mo, Molybdenum (ppm) 2.50 0.112 2.45 2.55 4-Acid Digestion
Na, Sodium (wt.%) 0.101 0.009 0.096 0.105 4-Acid Digestion
Nb, Niobium (ppm) 14.5 1.11 14.0 15.1 4-Acid Digestion
Nd, Neodymium (ppm) 13.4 1.5 11.9 14.9 4-Acid Digestion
P, Phosphorus (wt.%) 0.042 0.003 0.041 0.044 4-Acid Digestion
Pb, Lead (ppm) 21.8 1.35 21.2 22.3 4-Acid Digestion
Pr, Praseodymium (ppm) 3.70 0.41 3.17 4.23 4-Acid Digestion
Rb, Rubidium (ppm) 42.1 2.40 40.8 43.4 4-Acid Digestion
S, Sulphur (wt.%) 0.049 0.004 0.047 0.051 4-Acid Digestion
Sb, Antimony (ppm) 0.82 0.09 0.77 0.87 4-Acid Digestion
Sc, Scandium (ppm) 49.3 1.89 48.4 50.2 4-Acid Digestion
Sm, Samarium (ppm) 2.80 0.33 2.45 3.15 4-Acid Digestion
Sn, Tin (ppm) 2.78 0.200 2.67 2.88 4-Acid Digestion
Sr, Strontium (ppm) 31.3 1.83 30.5 32.2 4-Acid Digestion
Ta, Tantalum (ppm) 1.02 0.14 0.94 1.11 4-Acid Digestion
Tb, Terbium (ppm) 0.40 0.038 0.36 0.44 4-Acid Digestion
Th, Thorium (ppm) 14.5 1.15 13.9 15.1 4-Acid Digestion
Ti, Titanium (wt.%) 0.773 0.057 0.741 0.806 4-Acid Digestion
Tl, Thallium (ppm) 0.27 0.04 0.24 0.29 4-Acid Digestion
U, Uranium (ppm) 2.63 0.180 2.55 2.72 4-Acid Digestion
V, Vanadium (ppm) 235 12 229 240 4-Acid Digestion
W, Tungsten (ppm) 1.62 0.19 1.50 1.74 4-Acid Digestion
Y, Yttrium (ppm) 9.53 1.33 8.86 10.20 4-Acid Digestion
Yb, Ytterbium (ppm) 1.33 0.17 1.18 1.48 4-Acid Digestion
Zn, Zinc (ppm) 45.7 4.7 43.5 47.9 4-Acid Digestion
Zr, Zirconium (ppm) 141 21 130 152 4-Acid Digestion
Al, Aluminium (wt.%) 4.86 0.286 4.70 5.03 Aqua Regia Digestion
As, Arsenic (ppm) 6.50 1.29 5.98 7.03 Aqua Regia Digestion
Au, Gold (ppb) 21 2.4 20 22 Aqua Regia Digestion
Ba, Barium (ppm) 80 5.5 76 83 Aqua Regia Digestion
Bi, Bismuth (ppm) 0.30 0.04 0.27 0.33 Aqua Regia Digestion
Ca, Calcium (ppm) 890 63 858 921 Aqua Regia Digestion
Ce, Cerium (ppm) 24.8 2.8 22.1 27.4 Aqua Regia Digestion
Co, Cobalt (ppm) 26.2 3.0 24.6 27.8 Aqua Regia Digestion
Cr, Chromium (ppm) 467 36 447 487 Aqua Regia Digestion
Cu, Copper (ppm) 345 16 336 354 Aqua Regia Digestion
Fe, Iron (wt.%) 13.65 0.777 13.21 14.09 Aqua Regia Digestion
Ga, Gallium (ppm) 17.9 2.4 16.6 19.3 Aqua Regia Digestion
In, Indium (ppm) 0.085 0.006 0.078 0.092 Aqua Regia Digestion
K, Potassium (wt.%) 0.097 0.004 0.094 0.099 Aqua Regia Digestion
La, Lanthanum (ppm) 9.96 0.494 9.62 10.29 Aqua Regia Digestion
Li, Lithium (ppm) 11.9 1.5 10.5 13.4 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.144 0.007 0.140 0.148 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.040 0.002 0.038 0.041 Aqua Regia Digestion
Na, Sodium (wt.%) 0.031 0.005 0.029 0.034 Aqua Regia Digestion
Ni, Nickel (ppm) 176 12 170 183 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.035 0.001 0.034 0.036 Aqua Regia Digestion
Pb, Lead (ppm) 17.0 1.68 16.1 17.9 Aqua Regia Digestion
Rb, Rubidium (ppm) 20.9 3.8 17.2 24.6 Aqua Regia Digestion
S, Sulphur (wt.%) 0.045 0.006 0.041 0.049 Aqua Regia Digestion
Sc, Scandium (ppm) 41.5 3.73 39.4 43.6 Aqua Regia Digestion
Sn, Tin (ppm) 1.95 0.192 1.80 2.11 Aqua Regia Digestion
Sr, Strontium (ppm) 11.0 1.7 10.1 11.9 Aqua Regia Digestion
Th, Thorium (ppm) 11.3 1.2 10.4 12.2 Aqua Regia Digestion
U, Uranium (ppm) 1.64 0.17 1.50 1.78 Aqua Regia Digestion
V, Vanadium (ppm) 201 15 192 210 Aqua Regia Digestion
Y, Yttrium (ppm) 5.08 0.52 4.69 5.48 Aqua Regia Digestion
Zn, Zinc (ppm) 30.6 4.1 28.5 32.7 Aqua Regia Digestion
Pd, Palladium (ppb) 34.6 2.3 33.8 35.5 Pb Fire Assay
Pt, Platinum (ppb) 48.5 3.1 47.3 49.7 Pb Fire Assay
Al, Aluminium (wt.%) 8.26 0.236 8.15 8.36 Borate / Peroxide Fusion ICP
Ba, Barium (ppm) 183 6 180 186 Borate / Peroxide Fusion ICP
Ca, Calcium (wt.%) 0.185 0.013 0.178 0.191 Borate / Peroxide Fusion ICP
Ce, Cerium (ppm) 38.0 2.23 36.6 39.5 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 31.3 3.8 29.9 32.6 Borate / Peroxide Fusion ICP
Cr, Chromium (ppm) 585 20 575 595 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) 3.94 0.167 3.84 4.05 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 375 22 363 388 Borate / Peroxide Fusion ICP
Dy, Dysprosium (ppm) 3.23 0.289 3.02 3.44 Borate / Peroxide Fusion ICP
Er, Erbium (ppm) 2.03 0.134 1.97 2.10 Borate / Peroxide Fusion ICP
Eu, Europium (ppm) 0.67 0.047 0.64 0.70 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 14.78 0.502 14.53 15.02 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 21.4 1.11 20.7 22.1 Borate / Peroxide Fusion ICP
Gd, Gadolinium (ppm) 2.83 0.119 2.77 2.89 Borate / Peroxide Fusion ICP
Hf, Hafnium (ppm) 8.90 0.367 8.60 9.20 Borate / Peroxide Fusion ICP
Ho, Holmium (ppm) 0.68 0.040 0.65 0.70 Borate / Peroxide Fusion ICP
K, Potassium (wt.%) 0.426 0.026 0.415 0.436 Borate / Peroxide Fusion ICP
La, Lanthanum (ppm) 17.3 0.68 16.9 17.7 Borate / Peroxide Fusion ICP
Li, Lithium (ppm) 21.7 1.63 19.7 23.7 Borate / Peroxide Fusion ICP
Mg, Magnesium (wt.%) 0.247 0.013 0.241 0.254 Borate / Peroxide Fusion ICP
Mn, Manganese (wt.%) 0.050 0.002 0.050 0.051 Borate / Peroxide Fusion ICP
Na, Sodium (wt.%) 0.097 0.008 0.089 0.104 Borate / Peroxide Fusion ICP
Nb, Niobium (ppm) 17.5 0.99 16.9 18.1 Borate / Peroxide Fusion ICP
Nd, Neodymium (ppm) 14.5 0.92 13.9 15.0 Borate / Peroxide Fusion ICP
Ni, Nickel (ppm) 234 16 220 248 Borate / Peroxide Fusion ICP
P, Phosphorus (wt.%) 0.040 0.004 0.037 0.044 Borate / Peroxide Fusion ICP
Pr, Praseodymium (ppm) 3.94 0.153 3.85 4.03 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 42.3 2.39 40.9 43.7 Borate / Peroxide Fusion ICP
Sc, Scandium (ppm) 49.0 2.11 46.7 51.3 Borate / Peroxide Fusion ICP
Si, Silicon (wt.%) 22.63 0.484 22.40 22.86 Borate / Peroxide Fusion ICP
Sm, Samarium (ppm) 3.17 0.178 3.09 3.24 Borate / Peroxide Fusion ICP
Sn, Tin (ppm) 3.13 0.291 2.97 3.28 Borate / Peroxide Fusion ICP
Sr, Strontium (ppm) 32.9 1.81 31.9 34.0 Borate / Peroxide Fusion ICP
Ta, Tantalum (ppm) 1.30 0.098 1.23 1.37 Borate / Peroxide Fusion ICP
Tb, Terbium (ppm) 0.51 0.030 0.50 0.53 Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 15.0 0.70 14.6 15.4 Borate / Peroxide Fusion ICP
Ti, Titanium (wt.%) 0.869 0.013 0.863 0.876 Borate / Peroxide Fusion ICP
Tm, Thulium (ppm) 0.32 0.031 0.31 0.34 Borate / Peroxide Fusion ICP
U, Uranium (ppm) 3.00 0.146 2.91 3.09 Borate / Peroxide Fusion ICP
V, Vanadium (ppm) 243 18 232 255 Borate / Peroxide Fusion ICP
W, Tungsten (ppm) 1.97 0.146 1.83 2.11 Borate / Peroxide Fusion ICP
Y, Yttrium (ppm) 17.8 1.48 16.8 18.8 Borate / Peroxide Fusion ICP
Yb, Ytterbium (ppm) 2.17 0.139 2.10 2.25 Borate / Peroxide Fusion ICP
Zr, Zirconium (ppm) 333 20 320 347 Borate / Peroxide Fusion ICP
C, Carbon (wt.%) 1.04 0.033 1.03 1.06 Infrared Combustion
S, Sulphur (wt.%) 0.044 0.008 0.041 0.048 Infrared Combustion
Al2O3, Aluminium(III) oxide (wt.%) 15.99 0.187 15.89 16.10 Borate Fusion XRF
BaO, Barium oxide (ppm) 198 23 180 216 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.264 0.005 0.261 0.267 Borate Fusion XRF
Cr2O3, Chromium(III) oxide (ppm) 879 41 859 899 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 21.38 0.200 21.27 21.49 Borate Fusion XRF
K2O, Potassium oxide (wt.%) 0.510 0.005 0.507 0.512 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 0.421 0.016 0.412 0.430 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.066 0.005 0.063 0.068 Borate Fusion XRF
Na2O, Sodium oxide (wt.%) 0.125 0.016 0.116 0.135 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.099 0.006 0.096 0.102 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 49.63 0.327 49.45 49.81 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 1.49 0.026 1.47 1.50 Borate Fusion XRF
V2O5, Vanadium(V) oxide (ppm) 425 37 399 451 Borate Fusion XRF
LOI1000, Loss On Ignition @1000 °C (wt.%) 9.37 0.124 9.30 9.44 Thermogravimetry
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