OREAS 47

OREAS 47 is an augmented Canadian glacial basal till sourced from outside of Chibougamau, Quebec. The till composition reflects the geochemistry of the surrounding Archean greenstone belts and felsic intrusives with minor additions of various ores (PGE + REE + Li) and concentrates (base metals) to achieve anomalous concentration levels. Cobbles were removed prior to processing and all material has undergone sterilisation. A pure glacial till is also available (see OREAS 46).

Twenty commercial analytical laboratories participated in the following program:
 
  • Gold by 25-50g fire assay;
  • Instrumental neutron activation analysis for Au on 20 x 85mg subsamples to confirm homogeneity (1 laboratory only);
  • Gold by 15-50g aqua regia digestion;
  • Fusion with full ICP-OES and ICP-MS elemental suites;
  • Thermogravimetry for LOI at 1000° C;
  • Four acid digestion for full ICP-OES and ICP-MS elemental suites;
  • Aqua regia digestion using 0.15 to 50g sample weights for full ICP-OES and ICP-MS elemental suites.
Analyte Certified Value 1SD 95% Confidence Limits Low 95% Confidence Limits High Method
Au, Gold (ppb) 44.3 2.55 43.3 45.3 Pb Fire Assay
Cu, Copper (ppm) 159 4 158 160 4-Acid Digestion
Zn, Zinc (ppm) 226 14 219 232 4-Acid Digestion
Pd, Palladium (ppb) 44.2 2.6 41.3 47.2 Pb Fire Assay
Pt, Platinum (ppb) 29.2 2.1 27.1 31.2 Pb Fire Assay
Al2O3, Aluminium(III) oxide (wt.%) 11.96 0.322 11.79 12.12 Borate / Peroxide Fusion ICP
Ba, Barium (ppm) 473 23 462 484 Borate / Peroxide Fusion ICP
Be, Beryllium (ppm) 0.97 0.10 0.92 1.02 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 3.27 0.094 3.22 3.32 Borate / Peroxide Fusion ICP
Ce, Cerium (ppm) 56 3.9 54 58 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 52 2.5 49 55 Borate / Peroxide Fusion ICP
Cr2O3, Chromium(III) oxide (ppm) 165 16 157 173 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) 2.01 0.100 1.96 2.05 Borate / Peroxide Fusion ICP
Dy, Dysprosium (ppm) 2.11 0.102 2.06 2.15 Borate / Peroxide Fusion ICP
Er, Erbium (ppm) 1.16 0.047 1.14 1.17 Borate / Peroxide Fusion ICP
Eu, Europium (ppm) 1.01 0.047 0.98 1.03 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 3.97 0.100 3.92 4.02 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 14.1 0.90 13.5 14.7 Borate / Peroxide Fusion ICP
Gd, Gadolinium (ppm) 2.83 0.142 2.77 2.89 Borate / Peroxide Fusion ICP
Hf, Hafnium (ppm) 4.10 0.319 3.92 4.29 Borate / Peroxide Fusion ICP
Ho, Holmium (ppm) 0.42 0.021 0.40 0.43 Borate / Peroxide Fusion ICP
K2O, Potassium oxide (wt.%) 1.42 0.044 1.40 1.44 Borate / Peroxide Fusion ICP
La, Lanthanum (ppm) 30.9 1.98 29.8 32.0 Borate / Peroxide Fusion ICP
Lu, Lutetium (ppm) 0.16 0.009 0.16 0.16 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 1.67 0.047 1.65 1.70 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (wt.%) 0.064 0.003 0.062 0.065 Borate / Peroxide Fusion ICP
Mo, Molybdenum (ppm) 12.7 1.18 12.3 13.2 Borate / Peroxide Fusion ICP
Na2O, Sodium oxide (wt.%) 3.47 0.059 3.44 3.49 Borate / Peroxide Fusion ICP
Nb, Niobium (ppm) 17.9 1.09 17.2 18.6 Borate / Peroxide Fusion ICP
Nd, Neodymium (ppm) 24.0 1.12 23.4 24.6 Borate / Peroxide Fusion ICP
Ni, Nickel (ppm) 91 6.3 86 97 Borate / Peroxide Fusion ICP
P2O5, Phosphorus(V) oxide (wt.%) 0.129 0.012 0.124 0.133 Borate / Peroxide Fusion ICP
Pr, Praseodymium (ppm) 6.58 0.233 6.46 6.71 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 37.6 1.81 36.6 38.6 Borate / Peroxide Fusion ICP
Sc, Scandium (ppm) 9.27 0.521 8.67 9.86 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 72.78 0.995 72.34 73.23 Borate / Peroxide Fusion ICP
Sm, Samarium (ppm) 4.01 0.138 3.94 4.07 Borate / Peroxide Fusion ICP
Sn, Tin (ppm) 6.14 0.580 5.90 6.38 Borate / Peroxide Fusion ICP
Sr, Strontium (ppm) 402 12 395 408 Borate / Peroxide Fusion ICP
Ta, Tantalum (ppm) 0.46 0.10 0.41 0.51 Borate / Peroxide Fusion ICP
Tb, Terbium (ppm) 0.39 0.018 0.38 0.40 Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 3.84 0.205 3.75 3.93 Borate / Peroxide Fusion ICP
TiO2, Titanium dioxide (wt.%) 0.379 0.012 0.373 0.385 Borate / Peroxide Fusion ICP
Tm, Thulium (ppm) 0.17 0.012 0.16 0.17 Borate / Peroxide Fusion ICP
U, Uranium (ppm) 0.79 0.038 0.76 0.81 Borate / Peroxide Fusion ICP
V, Vanadium (ppm) 61 4.1 59 63 Borate / Peroxide Fusion ICP
W, Tungsten (ppm) < 1.00 IND IND IND Borate / Peroxide Fusion ICP
Y, Yttrium (ppm) 11.6 0.52 11.3 11.9 Borate / Peroxide Fusion ICP
Yb, Ytterbium (ppm) 1.08 0.058 1.05 1.10 Borate / Peroxide Fusion ICP
Zn, Zinc (ppm) 217 13 206 229 Borate / Peroxide Fusion ICP
Zr, Zirconium (ppm) 161 13 154 169 Borate / Peroxide Fusion ICP
LOI1000, Loss On Ignition @1000 °C (wt.%) 1.02 0.22 0.88 1.15 Thermogravimetry
Ag, Silver (ppm) 0.130 0.019 0.116 0.144 4-Acid Digestion
Al, Aluminium (wt.%) 6.25 0.183 6.17 6.33 4-Acid Digestion
As, Arsenic (ppm) 9.57 0.435 9.40 9.73 4-Acid Digestion
Ba, Barium (ppm) 485 14 479 491 4-Acid Digestion
Be, Beryllium (ppm) 1.04 0.11 0.99 1.08 4-Acid Digestion
Bi, Bismuth (ppm) 0.17 0.014 0.17 0.18 4-Acid Digestion
Ca, Calcium (wt.%) 2.31 0.056 2.29 2.33 4-Acid Digestion
Cd, Cadmium (ppm) 0.50 0.036 0.48 0.51 4-Acid Digestion
Ce, Cerium (ppm) 55 2.0 54 55 4-Acid Digestion
Co, Cobalt (ppm) 53 1.9 52 54 4-Acid Digestion
Cr, Chromium (ppm) 82 12 76 89 4-Acid Digestion
Cs, Caesium (ppm) 2.09 0.079 2.05 2.13 4-Acid Digestion
Dy, Dysprosium (ppm) 2.12 0.118 2.07 2.17 4-Acid Digestion
Er, Erbium (ppm) 1.18 0.088 1.12 1.23 4-Acid Digestion
Eu, Europium (ppm) 1.03 0.080 0.98 1.08 4-Acid Digestion
Fe, Iron (wt.%) 2.78 0.067 2.75 2.80 4-Acid Digestion
Ga, Gallium (ppm) 14.1 0.65 13.7 14.4 4-Acid Digestion
Gd, Gadolinium (ppm) 3.01 0.249 2.88 3.14 4-Acid Digestion
Hf, Hafnium (ppm) 1.87 0.173 1.79 1.94 4-Acid Digestion
Ho, Holmium (ppm) 0.41 0.024 0.39 0.42 4-Acid Digestion
In, Indium (ppm) 0.055 0.006 0.052 0.057 4-Acid Digestion
K, Potassium (wt.%) 1.18 0.029 1.17 1.19 4-Acid Digestion
La, Lanthanum (ppm) 30.1 1.23 29.6 30.6 4-Acid Digestion
Li, Lithium (ppm) 42.5 2.38 41.3 43.7 4-Acid Digestion
Lu, Lutetium (ppm) 0.15 0.02 0.14 0.16 4-Acid Digestion
Mg, Magnesium (wt.%) 0.979 0.022 0.970 0.987 4-Acid Digestion
Mn, Manganese (wt.%) 0.051 0.002 0.050 0.052 4-Acid Digestion
Mo, Molybdenum (ppm) 12.9 0.44 12.7 13.1 4-Acid Digestion
Na, Sodium (wt.%) 2.61 0.057 2.59 2.63 4-Acid Digestion
Nb, Niobium (ppm) 17.0 0.84 16.5 17.5 4-Acid Digestion
Nd, Neodymium (ppm) 24.3 1.08 23.7 24.9 4-Acid Digestion
Ni, Nickel (ppm) 90 2.8 88 91 4-Acid Digestion
P, Phosphorus (wt.%) 0.056 0.002 0.056 0.057 4-Acid Digestion
Pb, Lead (ppm) 284 10 279 289 4-Acid Digestion
Pr, Praseodymium (ppm) 6.68 0.245 6.60 6.77 4-Acid Digestion
Rb, Rubidium (ppm) 37.9 2.14 36.9 38.9 4-Acid Digestion
Re, Rhenium (ppm) < 0.002 IND IND IND 4-Acid Digestion
S, Sulphur (wt.%) 0.044 0.005 0.041 0.046 4-Acid Digestion
Sb, Antimony (ppm) 0.32 0.03 0.30 0.34 4-Acid Digestion
Sc, Scandium (ppm) 9.11 0.320 8.92 9.31 4-Acid Digestion
Sm, Samarium (ppm) 4.03 0.281 3.90 4.15 4-Acid Digestion
Sn, Tin (ppm) 4.30 0.45 4.11 4.50 4-Acid Digestion
Sr, Strontium (ppm) 408 17 400 415 4-Acid Digestion
Ta, Tantalum (ppm) 0.42 0.08 0.38 0.47 4-Acid Digestion
Tb, Terbium (ppm) 0.38 0.018 0.37 0.39 4-Acid Digestion
Th, Thorium (ppm) 3.86 0.236 3.76 3.97 4-Acid Digestion
Ti, Titanium (wt.%) 0.213 0.008 0.208 0.217 4-Acid Digestion
Tl, Thallium (ppm) 0.25 0.022 0.24 0.26 4-Acid Digestion
Tm, Thulium (ppm) 0.15 0.006 0.15 0.15 4-Acid Digestion
U, Uranium (ppm) 0.76 0.052 0.73 0.79 4-Acid Digestion
V, Vanadium (ppm) 58 2.1 57 59 4-Acid Digestion
W, Tungsten (ppm) 0.26 0.024 0.24 0.28 4-Acid Digestion
Y, Yttrium (ppm) 10.7 0.41 10.5 10.9 4-Acid Digestion
Yb, Ytterbium (ppm) 1.01 0.053 0.99 1.04 4-Acid Digestion
Zr, Zirconium (ppm) 63 7 60 66 4-Acid Digestion
Ag, Silver (ppm) 0.107 0.010 0.101 0.113 Aqua Regia Digestion (sample weights 0.15-50g)
Al, Aluminium (wt.%) 0.810 0.067 0.775 0.845 Aqua Regia Digestion (sample weights 0.15-50g)
As, Arsenic (ppm) 9.53 0.648 9.14 9.92 Aqua Regia Digestion (sample weights 0.15-50g)
Au, Gold (ppb) 32.4 5.52 29.5 35.3 Aqua Regia Digestion (sample weights 0.15-50g)
Ba, Barium (ppm) 62 2.6 60 63 Aqua Regia Digestion (sample weights 0.15-50g)
Be, Beryllium (ppm) 0.19 0.02 0.17 0.21 Aqua Regia Digestion (sample weights 0.15-50g)
Bi, Bismuth (ppm) 0.15 0.014 0.14 0.16 Aqua Regia Digestion (sample weights 0.15-50g)
Ca, Calcium (wt.%) 0.547 0.056 0.516 0.579 Aqua Regia Digestion (sample weights 0.15-50g)
Cd, Cadmium (ppm) 0.50 0.041 0.48 0.52 Aqua Regia Digestion (sample weights 0.15-50g)
Ce, Cerium (ppm) 44.7 3.05 43.2 46.3 Aqua Regia Digestion (sample weights 0.15-50g)
Co, Cobalt (ppm) 49.9 3.00 48.4 51.4 Aqua Regia Digestion (sample weights 0.15-50g)
Cr, Chromium (ppm) 30.4 1.96 29.4 31.4 Aqua Regia Digestion (sample weights 0.15-50g)
Cs, Caesium (ppm) 1.19 0.062 1.15 1.22 Aqua Regia Digestion (sample weights 0.15-50g)
Cu, Copper (ppm) 160 6 157 163 Aqua Regia Digestion (sample weights 0.15-50g)
Fe, Iron (wt.%) 1.65 0.125 1.58 1.71 Aqua Regia Digestion (sample weights 0.15-50g)
Ga, Gallium (ppm) 3.28 0.41 3.04 3.53 Aqua Regia Digestion (sample weights 0.15-50g)
Gd, Gadolinium (ppm) 1.92 0.33 1.54 2.29 Aqua Regia Digestion (sample weights 0.15-50g)
Ge, Germanium (ppm) 0.075 0.011 0.063 0.086 Aqua Regia Digestion (sample weights 0.15-50g)
Ho, Holmium (ppm) 0.21 0.04 0.16 0.27 Aqua Regia Digestion (sample weights 0.15-50g)
In, Indium (ppm) 0.037 0.006 0.033 0.041 Aqua Regia Digestion (sample weights 0.15-50g)
K, Potassium (wt.%) 0.116 0.010 0.110 0.121 Aqua Regia Digestion (sample weights 0.15-50g)
La, Lanthanum (ppm) 25.2 1.16 24.5 25.8 Aqua Regia Digestion (sample weights 0.15-50g)
Li, Lithium (ppm) 8.83 0.89 8.25 9.42 Aqua Regia Digestion (sample weights 0.15-50g)
Lu, Lutetium (ppm) 0.070 0.011 0.058 0.081 Aqua Regia Digestion (sample weights 0.15-50g)
Mg, Magnesium (wt.%) 0.484 0.046 0.459 0.508 Aqua Regia Digestion (sample weights 0.15-50g)
Mn, Manganese (wt.%) 0.027 0.002 0.026 0.028 Aqua Regia Digestion (sample weights 0.15-50g)
Mo, Molybdenum (ppm) 12.7 0.89 12.3 13.2 Aqua Regia Digestion (sample weights 0.15-50g)
Na, Sodium (wt.%) 0.091 0.016 0.081 0.100 Aqua Regia Digestion (sample weights 0.15-50g)
Nd, Neodymium (ppm) 17.8 2.0 15.5 20.0 Aqua Regia Digestion (sample weights 0.15-50g)
Ni, Nickel (ppm) 80 4.1 78 82 Aqua Regia Digestion (sample weights 0.15-50g)
P, Phosphorus (wt.%) 0.055 0.002 0.054 0.055 Aqua Regia Digestion (sample weights 0.15-50g)
Pb, Lead (ppm) 284 15 276 291 Aqua Regia Digestion (sample weights 0.15-50g)
Pd, Palladium (ppb) 43.1 4.3 40.2 46.0 Aqua Regia Digestion (sample weights 0.15-50g)
Pr, Praseodymium (ppm) 5.30 0.261 4.97 5.63 Aqua Regia Digestion (sample weights 0.15-50g)
Pt, Platinum (ppb) 25.7 1.9 24.3 27.1 Aqua Regia Digestion (sample weights 0.15-50g)
Rb, Rubidium (ppm) 7.15 0.512 6.88 7.42 Aqua Regia Digestion (sample weights 0.15-50g)
Re, Rhenium (ppm) < 0.001 IND IND IND Aqua Regia Digestion (sample weights 0.15-50g)
S, Sulphur (wt.%) 0.046 0.004 0.044 0.048 Aqua Regia Digestion (sample weights 0.15-50g)
Sb, Antimony (ppm) 0.20 0.03 0.18 0.22 Aqua Regia Digestion (sample weights 0.15-50g)
Sc, Scandium (ppm) 3.17 0.54 2.88 3.47 Aqua Regia Digestion (sample weights 0.15-50g)
Se, Selenium (ppm) < 0.40 IND IND IND Aqua Regia Digestion (sample weights 0.15-50g)
Sm, Samarium (ppm) 2.66 0.37 2.25 3.08 Aqua Regia Digestion (sample weights 0.15-50g)
Sn, Tin (ppm) 2.54 0.34 2.35 2.74 Aqua Regia Digestion (sample weights 0.15-50g)
Sr, Strontium (ppm) 31.4 4.1 29.2 33.7 Aqua Regia Digestion (sample weights 0.15-50g)
Tb, Terbium (ppm) 0.23 0.04 0.20 0.26 Aqua Regia Digestion (sample weights 0.15-50g)
Th, Thorium (ppm) 3.25 0.211 3.14 3.36 Aqua Regia Digestion (sample weights 0.15-50g)
Ti, Titanium (wt.%) 0.070 0.014 0.062 0.079 Aqua Regia Digestion (sample weights 0.15-50g)
Tl, Thallium (ppm) 0.083 0.009 0.077 0.088 Aqua Regia Digestion (sample weights 0.15-50g)
U, Uranium (ppm) 0.47 0.05 0.43 0.50 Aqua Regia Digestion (sample weights 0.15-50g)
V, Vanadium (ppm) 24.7 2.28 23.4 25.9 Aqua Regia Digestion (sample weights 0.15-50g)
W, Tungsten (ppm) 0.11 0.02 0.10 0.13 Aqua Regia Digestion (sample weights 0.15-50g)
Y, Yttrium (ppm) 5.75 0.84 5.26 6.23 Aqua Regia Digestion (sample weights 0.15-50g)
Yb, Ytterbium (ppm) 0.50 0.09 0.44 0.57 Aqua Regia Digestion (sample weights 0.15-50g)
Zn, Zinc (ppm) 213 10 208 218 Aqua Regia Digestion (sample weights 0.15-50g)
Zr, Zirconium (ppm) 6.70 0.93 6.07 7.33 Aqua Regia Digestion (sample weights 0.15-50g)
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