OREAS 46

OREAS 46 is a 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. Cobbles were removed prior to processing and all material has undergone sterilisation. An augmented glacial till is also available that contains anomalous levels of PGE + REE + base metals + Li (see OREAS 47)

Twenty commercial analytical laboratories participated in the following program:
 
  • Gold by 25-50g fire assay;
  • 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) 1.6 1.00 1.2 2.1 Pb Fire Assay
Cu, Copper (ppm) 23.1 0.60 22.9 23.3 4-Acid Digestion
Zn, Zinc (ppm) 35.5 1.36 35.0 36.0 4-Acid Digestion
Pd, Palladium (ppb) < 1.00 IND IND IND Pb Fire Assay
Pt, Platinum (ppb) < 1.00 IND IND IND Pb Fire Assay
Al2O3, Aluminium(III) oxide (wt.%) 12.05 0.288 11.91 12.19 Borate / Peroxide Fusion ICP
Ba, Barium (ppm) 461 15 452 469 Borate / Peroxide Fusion ICP
Be, Beryllium (ppm) 0.92 0.16 0.81 1.02 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 3.40 0.087 3.36 3.44 Borate / Peroxide Fusion ICP
Ce, Cerium (ppm) 37.2 2.65 35.8 38.7 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 9.93 0.742 9.29 10.57 Borate / Peroxide Fusion ICP
Cr2O3, Chromium(III) oxide (ppm) 97 7.2 92 101 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) 0.62 0.039 0.59 0.65 Borate / Peroxide Fusion ICP
Dy, Dysprosium (ppm) 2.02 0.074 1.99 2.04 Borate / Peroxide Fusion ICP
Er, Erbium (ppm) 1.12 0.050 1.10 1.14 Borate / Peroxide Fusion ICP
Eu, Europium (ppm) 0.88 0.036 0.87 0.90 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 3.79 0.091 3.74 3.84 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 14.1 0.76 13.6 14.6 Borate / Peroxide Fusion ICP
Gd, Gadolinium (ppm) 2.60 0.154 2.53 2.66 Borate / Peroxide Fusion ICP
Hf, Hafnium (ppm) 4.11 0.240 4.00 4.22 Borate / Peroxide Fusion ICP
Ho, Holmium (ppm) 0.40 0.023 0.39 0.41 Borate / Peroxide Fusion ICP
K2O, Potassium oxide (wt.%) 1.42 0.045 1.40 1.44 Borate / Peroxide Fusion ICP
La, Lanthanum (ppm) 19.7 1.39 18.9 20.5 Borate / Peroxide Fusion ICP
Lu, Lutetium (ppm) 0.16 0.011 0.16 0.16 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 1.61 0.045 1.59 1.63 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (wt.%) 0.064 0.004 0.062 0.065 Borate / Peroxide Fusion ICP
Mo, Molybdenum (ppm) < 2.00 IND IND IND Borate / Peroxide Fusion ICP
Na2O, Sodium oxide (wt.%) 3.49 0.070 3.45 3.52 Borate / Peroxide Fusion ICP
Nb, Niobium (ppm) 5.42 0.338 5.20 5.64 Borate / Peroxide Fusion ICP
Nd, Neodymium (ppm) 18.7 0.77 18.2 19.1 Borate / Peroxide Fusion ICP
Ni, Nickel (ppm) 30.7 3.9 25.5 36.0 Borate / Peroxide Fusion ICP
P2O5, Phosphorus(V) oxide (wt.%) 0.122 0.015 0.117 0.127 Borate / Peroxide Fusion ICP
Pr, Praseodymium (ppm) 4.81 0.219 4.70 4.92 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 33.5 1.64 32.6 34.4 Borate / Peroxide Fusion ICP
Sc, Scandium (ppm) 9.17 0.461 8.58 9.75 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 72.73 1.120 72.30 73.16 Borate / Peroxide Fusion ICP
Sm, Samarium (ppm) 3.33 0.188 3.24 3.41 Borate / Peroxide Fusion ICP
Sr, Strontium (ppm) 404 13 397 411 Borate / Peroxide Fusion ICP
Ta, Tantalum (ppm) 0.31 0.09 0.26 0.36 Borate / Peroxide Fusion ICP
Tb, Terbium (ppm) 0.36 0.020 0.35 0.37 Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 3.23 0.248 3.11 3.34 Borate / Peroxide Fusion ICP
TiO2, Titanium dioxide (wt.%) 0.372 0.013 0.366 0.378 Borate / Peroxide Fusion ICP
Tm, Thulium (ppm) 0.16 0.012 0.16 0.17 Borate / Peroxide Fusion ICP
U, Uranium (ppm) 0.74 0.036 0.72 0.76 Borate / Peroxide Fusion ICP
V, Vanadium (ppm) 60 3.2 58 62 Borate / Peroxide Fusion ICP
W, Tungsten (ppm) < 1.00 IND IND IND Borate / Peroxide Fusion ICP
Y, Yttrium (ppm) 11.4 0.68 11.0 11.8 Borate / Peroxide Fusion ICP
Yb, Ytterbium (ppm) 1.07 0.054 1.04 1.09 Borate / Peroxide Fusion ICP
Zr, Zirconium (ppm) 159 12 152 166 Borate / Peroxide Fusion ICP
LOI1000, Loss On Ignition @1000 °C (wt.%) 1.06 0.22 0.91 1.22 Thermogravimetry
Ag, Silver (ppm) 0.038 0.007 0.032 0.043 4-Acid Digestion
Al, Aluminium (wt.%) 6.26 0.160 6.19 6.32 4-Acid Digestion
As, Arsenic (ppm) 1.01 0.24 0.80 1.22 4-Acid Digestion
Ba, Barium (ppm) 473 12 467 478 4-Acid Digestion
Be, Beryllium (ppm) 0.91 0.077 0.88 0.95 4-Acid Digestion
Bi, Bismuth (ppm) 0.054 0.006 0.053 0.056 4-Acid Digestion
Ca, Calcium (wt.%) 2.40 0.042 2.39 2.42 4-Acid Digestion
Cd, Cadmium (ppm) 0.059 0.014 0.050 0.067 4-Acid Digestion
Ce, Cerium (ppm) 36.4 1.68 35.6 37.2 4-Acid Digestion
Co, Cobalt (ppm) 9.83 0.397 9.64 10.02 4-Acid Digestion
Cr, Chromium (ppm) 45.7 8.5 41.5 49.9 4-Acid Digestion
Cs, Caesium (ppm) 0.64 0.035 0.62 0.66 4-Acid Digestion
Dy, Dysprosium (ppm) 2.03 0.112 1.97 2.08 4-Acid Digestion
Er, Erbium (ppm) 1.13 0.071 1.09 1.18 4-Acid Digestion
Eu, Europium (ppm) 0.89 0.052 0.86 0.92 4-Acid Digestion
Fe, Iron (wt.%) 2.61 0.067 2.58 2.64 4-Acid Digestion
Ga, Gallium (ppm) 14.0 0.51 13.7 14.2 4-Acid Digestion
Gd, Gadolinium (ppm) 2.66 0.220 2.55 2.77 4-Acid Digestion
Hf, Hafnium (ppm) 1.82 0.154 1.76 1.89 4-Acid Digestion
Ho, Holmium (ppm) 0.39 0.021 0.38 0.40 4-Acid Digestion
In, Indium (ppm) 0.026 0.005 0.023 0.029 4-Acid Digestion
K, Potassium (wt.%) 1.19 0.030 1.17 1.20 4-Acid Digestion
La, Lanthanum (ppm) 18.9 1.13 18.4 19.4 4-Acid Digestion
Li, Lithium (ppm) 10.4 0.46 10.2 10.6 4-Acid Digestion
Lu, Lutetium (ppm) 0.15 0.011 0.14 0.15 4-Acid Digestion
Mg, Magnesium (wt.%) 0.943 0.026 0.931 0.955 4-Acid Digestion
Mn, Manganese (wt.%) 0.049 0.002 0.048 0.050 4-Acid Digestion
Mo, Molybdenum (ppm) 0.77 0.065 0.73 0.81 4-Acid Digestion
Na, Sodium (wt.%) 2.61 0.084 2.57 2.65 4-Acid Digestion
Nb, Niobium (ppm) 4.56 0.411 4.36 4.77 4-Acid Digestion
Nd, Neodymium (ppm) 18.5 0.56 18.3 18.8 4-Acid Digestion
Ni, Nickel (ppm) 26.8 1.04 26.3 27.3 4-Acid Digestion
P, Phosphorus (wt.%) 0.054 0.002 0.053 0.055 4-Acid Digestion
Pb, Lead (ppm) 7.02 0.191 6.97 7.06 4-Acid Digestion
Pr, Praseodymium (ppm) 4.84 0.222 4.74 4.95 4-Acid Digestion
Rb, Rubidium (ppm) 33.5 1.59 32.8 34.3 4-Acid Digestion
Re, Rhenium (ppm) < 0.002 IND IND IND 4-Acid Digestion
S, Sulphur (wt.%) < 0.005 IND IND IND 4-Acid Digestion
Sb, Antimony (ppm) 0.10 0.02 0.10 0.11 4-Acid Digestion
Sc, Scandium (ppm) 8.75 0.358 8.55 8.95 4-Acid Digestion
Sm, Samarium (ppm) 3.32 0.180 3.23 3.41 4-Acid Digestion
Sn, Tin (ppm) 0.78 0.066 0.73 0.83 4-Acid Digestion
Sr, Strontium (ppm) 408 13 402 413 4-Acid Digestion
Ta, Tantalum (ppm) 0.27 0.04 0.24 0.29 4-Acid Digestion
Tb, Terbium (ppm) 0.36 0.025 0.35 0.37 4-Acid Digestion
Th, Thorium (ppm) 3.26 0.220 3.17 3.35 4-Acid Digestion
Ti, Titanium (wt.%) 0.207 0.010 0.203 0.212 4-Acid Digestion
Tl, Thallium (ppm) 0.21 0.016 0.20 0.22 4-Acid Digestion
Tm, Thulium (ppm) 0.15 0.011 0.15 0.16 4-Acid Digestion
U, Uranium (ppm) 0.70 0.042 0.68 0.72 4-Acid Digestion
V, Vanadium (ppm) 57 2.1 56 58 4-Acid Digestion
W, Tungsten (ppm) 0.21 0.04 0.18 0.24 4-Acid Digestion
Y, Yttrium (ppm) 10.5 0.36 10.4 10.6 4-Acid Digestion
Yb, Ytterbium (ppm) 1.01 0.060 0.98 1.03 4-Acid Digestion
Zr, Zirconium (ppm) 61 4.7 59 63 4-Acid Digestion
Ag, Silver (ppm) 0.025 0.002 0.023 0.026 Aqua Regia Digestion (sample weights 0.15-50g)
Al, Aluminium (wt.%) 0.748 0.067 0.712 0.784 Aqua Regia Digestion (sample weights 0.15-50g)
As, Arsenic (ppm) 0.72 0.10 0.66 0.77 Aqua Regia Digestion (sample weights 0.15-50g)
Au, Gold (ppb) 1.2 0.51 1.0 1.4 Aqua Regia Digestion (sample weights 0.15-50g)
Ba, Barium (ppm) 55 3.6 53 57 Aqua Regia Digestion (sample weights 0.15-50g)
Be, Beryllium (ppm) 0.17 0.02 0.15 0.18 Aqua Regia Digestion (sample weights 0.15-50g)
Bi, Bismuth (ppm) 0.028 0.006 0.022 0.033 Aqua Regia Digestion (sample weights 0.15-50g)
Ca, Calcium (wt.%) 0.600 0.053 0.571 0.630 Aqua Regia Digestion (sample weights 0.15-50g)
Cd, Cadmium (ppm) 0.036 0.007 0.032 0.040 Aqua Regia Digestion (sample weights 0.15-50g)
Ce, Cerium (ppm) 27.3 2.17 26.2 28.4 Aqua Regia Digestion (sample weights 0.15-50g)
Co, Cobalt (ppm) 5.83 0.582 5.50 6.16 Aqua Regia Digestion (sample weights 0.15-50g)
Cr, Chromium (ppm) 25.0 2.18 23.9 26.1 Aqua Regia Digestion (sample weights 0.15-50g)
Cs, Caesium (ppm) 0.36 0.022 0.35 0.37 Aqua Regia Digestion (sample weights 0.15-50g)
Cu, Copper (ppm) 23.4 1.21 22.8 23.9 Aqua Regia Digestion (sample weights 0.15-50g)
Fe, Iron (wt.%) 1.45 0.108 1.40 1.51 Aqua Regia Digestion (sample weights 0.15-50g)
Ga, Gallium (ppm) 2.99 0.40 2.74 3.23 Aqua Regia Digestion (sample weights 0.15-50g)
Gd, Gadolinium (ppm) 1.64 0.29 1.32 1.96 Aqua Regia Digestion (sample weights 0.15-50g)
Ge, Germanium (ppm) 0.061 0.008 0.052 0.070 Aqua Regia Digestion (sample weights 0.15-50g)
Ho, Holmium (ppm) 0.20 0.04 0.15 0.25 Aqua Regia Digestion (sample weights 0.15-50g)
K, Potassium (wt.%) 0.109 0.010 0.103 0.114 Aqua Regia Digestion (sample weights 0.15-50g)
La, Lanthanum (ppm) 15.5 1.16 14.8 16.1 Aqua Regia Digestion (sample weights 0.15-50g)
Li, Lithium (ppm) 6.78 0.669 6.35 7.22 Aqua Regia Digestion (sample weights 0.15-50g)
Lu, Lutetium (ppm) 0.067 0.012 0.054 0.080 Aqua Regia Digestion (sample weights 0.15-50g)
Mg, Magnesium (wt.%) 0.459 0.047 0.434 0.484 Aqua Regia Digestion (sample weights 0.15-50g)
Mn, Manganese (wt.%) 0.025 0.002 0.024 0.026 Aqua Regia Digestion (sample weights 0.15-50g)
Mo, Molybdenum (ppm) 0.66 0.041 0.64 0.67 Aqua Regia Digestion (sample weights 0.15-50g)
Na, Sodium (wt.%) 0.077 0.011 0.070 0.084 Aqua Regia Digestion (sample weights 0.15-50g)
Nd, Neodymium (ppm) 13.2 1.6 11.3 15.0 Aqua Regia Digestion (sample weights 0.15-50g)
Ni, Nickel (ppm) 16.3 1.11 15.6 17.0 Aqua Regia Digestion (sample weights 0.15-50g)
P, Phosphorus (wt.%) 0.053 0.002 0.052 0.054 Aqua Regia Digestion (sample weights 0.15-50g)
Pb, Lead (ppm) 2.02 0.144 1.94 2.10 Aqua Regia Digestion (sample weights 0.15-50g)
Pd, Palladium (ppb) < 1.00 IND IND IND Aqua Regia Digestion (sample weights 0.15-50g)
Pr, Praseodymium (ppm) 3.75 0.129 3.60 3.90 Aqua Regia Digestion (sample weights 0.15-50g)
Pt, Platinum (ppb) < 2.00 IND IND IND Aqua Regia Digestion (sample weights 0.15-50g)
Rb, Rubidium (ppm) 6.11 0.337 5.93 6.30 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.%) < 0.005 IND IND IND Aqua Regia Digestion (sample weights 0.15-50g)
Sb, Antimony (ppm) 0.068 0.009 0.064 0.072 Aqua Regia Digestion (sample weights 0.15-50g)
Sc, Scandium (ppm) 2.78 0.49 2.51 3.05 Aqua Regia Digestion (sample weights 0.15-50g)
Se, Selenium (ppm) < 0.20 IND IND IND Aqua Regia Digestion (sample weights 0.15-50g)
Sm, Samarium (ppm) 2.11 0.34 1.73 2.49 Aqua Regia Digestion (sample weights 0.15-50g)
Sn, Tin (ppm) 0.40 0.06 0.35 0.45 Aqua Regia Digestion (sample weights 0.15-50g)
Sr, Strontium (ppm) 26.9 4.1 24.6 29.1 Aqua Regia Digestion (sample weights 0.15-50g)
Tb, Terbium (ppm) 0.20 0.03 0.17 0.23 Aqua Regia Digestion (sample weights 0.15-50g)
Th, Thorium (ppm) 2.87 0.224 2.76 2.99 Aqua Regia Digestion (sample weights 0.15-50g)
Ti, Titanium (wt.%) 0.065 0.013 0.057 0.074 Aqua Regia Digestion (sample weights 0.15-50g)
Tl, Thallium (ppm) 0.061 0.007 0.058 0.065 Aqua Regia Digestion (sample weights 0.15-50g)
U, Uranium (ppm) 0.43 0.05 0.40 0.46 Aqua Regia Digestion (sample weights 0.15-50g)
V, Vanadium (ppm) 22.1 2.5 20.8 23.3 Aqua Regia Digestion (sample weights 0.15-50g)
W, Tungsten (ppm) 0.073 0.013 0.062 0.083 Aqua Regia Digestion (sample weights 0.15-50g)
Y, Yttrium (ppm) 5.06 0.62 4.66 5.46 Aqua Regia Digestion (sample weights 0.15-50g)
Yb, Ytterbium (ppm) 0.48 0.10 0.40 0.55 Aqua Regia Digestion (sample weights 0.15-50g)
Zn, Zinc (ppm) 20.7 2.03 19.5 21.9 Aqua Regia Digestion (sample weights 0.15-50g)
Zr, Zirconium (ppm) 5.66 1.34 4.82 6.51 Aqua Regia Digestion (sample weights 0.15-50g)
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