OREAS 120

Reference material OREAS 120 is one of a suite of five uranium CRMs prepared from material sourced from trenching at Mantra Resources Nyota Prospect, Tanzania. The Nyota Prospect is a Karoo sandstone-hosted tabular deposit. Mineralisation is secondary and typically concentrated within medium to very coarse grained sandstone units interbedded with greywackes, siltstones or mudstones. The distribution of mineralisation is controlled by primary sedimentary features, consistent with fluid migrating along permeable coarse grained units, along bedding planes, up cross bedding and with preferential deposition occurring around ferruginous concretions and claystone clasts. Supergene enrichment is interpreted to have contributed to the high grade nature of the secondary mineralisation observed in the trenches.
Eighteen commercial analytical laboratories participated in the program to characterise the elements reported in Tables 1 to 6 (please see certificate). The following methods were employed:
  • Lithium borate fusion with X-ray fluorescence (9 laboratories – 10 oxides/elements)
  • Sodium peroxide fusion or lithium borate fusion with ICP-OES and ICP-MS (10 laboratories – 28 elements)
  • Four acid digestion with ICP-OES and ICP-MS (16 laboratories – 38 elements)
  • Thermogravimetry for Loss On Ignition (12 laboratories)
  • Infra-red combustion furnace for carbon and sulphur (11 laboratories)
  • Pressed powder pellet XRF for U (2 laboratories)
Analyte Certified Value 1SD 95% Confidence Limits Low 95% Confidence Limits High Method
U, Uranium (ppm) 40.8 1.39 39.7 41.8 Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 5.45 0.340 5.32 5.58 Borate / Peroxide Fusion ICP
Ce, Cerium (ppm) 46.3 2.95 44.3 48.3 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 9.14 0.145 9.03 9.25 Borate Fusion XRF
BaO, Barium oxide (ppm) 1088 44 1056 1121 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 2.27 0.045 2.24 2.30 Borate Fusion XRF
K2O, Potassium oxide (wt.%) 3.31 0.049 3.27 3.35 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 0.410 0.022 0.392 0.429 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.103 0.002 0.101 0.104 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.029 0.004 0.026 0.032 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 81.86 0.603 81.41 82.31 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.427 0.015 0.414 0.439 Borate Fusion XRF
U, Uranium (ppm) 40.5 7.0 35.4 45.7 Borate Fusion XRF
Al, Aluminium (wt.%) 4.68 0.124 4.58 4.79 Borate / Peroxide Fusion ICP
Ba, Barium (ppm) 973 34 937 1009 Borate / Peroxide Fusion ICP
Be, Beryllium (ppm) 1.13 0.22 0.90 1.36 Borate / Peroxide Fusion ICP
Ca, Calcium (wt.%) 0.064 0.010 0.054 0.074 Borate / Peroxide Fusion ICP
Cr, Chromium (ppm) 46.9 3.77 42.7 51.1 Borate / Peroxide Fusion ICP
Dy, Dysprosium (ppm) 2.40 0.136 2.29 2.51 Borate / Peroxide Fusion ICP
Eu, Europium (ppm) 1.03 0.088 0.95 1.11 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 1.58 0.042 1.55 1.60 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 10.7 0.64 10.1 11.3 Borate / Peroxide Fusion ICP
Gd, Gadolinium (ppm) 3.04 0.49 2.92 3.17 Borate / Peroxide Fusion ICP
Hf, Hafnium (ppm) 5.97 0.552 5.45 6.50 Borate / Peroxide Fusion ICP
Ho, Holmium (ppm) 0.48 0.05 0.45 0.50 Borate / Peroxide Fusion ICP
K, Potassium (wt.%) 2.66 0.069 2.62 2.71 Borate / Peroxide Fusion ICP
La, Lanthanum (ppm) 21.1 1.77 19.8 22.4 Borate / Peroxide Fusion ICP
Lu, Lutetium (ppm) 0.21 0.03 0.20 0.23 Borate / Peroxide Fusion ICP
Mg, Magnesium (wt.%) 0.240 0.008 0.234 0.245 Borate / Peroxide Fusion ICP
Mn, Manganese (wt.%) 0.079 0.002 0.078 0.081 Borate / Peroxide Fusion ICP
Nd, Neodymium (ppm) 19.1 1.19 18.2 20.0 Borate / Peroxide Fusion ICP
Pr, Praseodymium (ppm) 5.01 0.268 4.81 5.21 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 87 2.0 85 88 Borate / Peroxide Fusion ICP
Si, Silicon (wt.%) 38.00 0.894 37.32 38.67 Borate / Peroxide Fusion ICP
Sm, Samarium (ppm) 3.74 0.204 3.65 3.84 Borate / Peroxide Fusion ICP
Sr, Strontium (ppm) 127 5 122 131 Borate / Peroxide Fusion ICP
Tb, Terbium (ppm) 0.44 0.041 0.42 0.46 Borate / Peroxide Fusion ICP
Ti, Titanium (wt.%) 0.243 0.012 0.233 0.254 Borate / Peroxide Fusion ICP
Tm, Thulium (ppm) 0.20 0.015 0.19 0.21 Borate / Peroxide Fusion ICP
Y, Yttrium (ppm) 12.2 0.64 11.8 12.5 Borate / Peroxide Fusion ICP
Yb, Ytterbium (ppm) 1.34 0.123 1.29 1.40 Borate / Peroxide Fusion ICP
Zr, Zirconium (ppm) 255 17 240 270 Borate / Peroxide Fusion ICP
Al, Aluminium (wt.%) 4.63 0.171 4.53 4.73 4-Acid Digestion
Ba, Barium (ppm) 983 26 972 994 4-Acid Digestion
Be, Beryllium (ppm) 1.50 0.16 1.42 1.58 4-Acid Digestion
Ca, Calcium (wt.%) 0.062 0.004 0.061 0.064 4-Acid Digestion
Ce, Cerium (ppm) 44.5 2.76 43.0 46.0 4-Acid Digestion
Co, Cobalt (ppm) 4.22 0.279 4.06 4.38 4-Acid Digestion
Cr, Chromium (ppm) 32.7 6.2 29.1 36.3 4-Acid Digestion
Cs, Caesium (ppm) 0.74 0.045 0.72 0.77 4-Acid Digestion
Dy, Dysprosium (ppm) 2.29 0.178 2.09 2.50 4-Acid Digestion
Eu, Europium (ppm) 1.11 0.15 0.92 1.30 4-Acid Digestion
Fe, Iron (wt.%) 1.57 0.049 1.55 1.59 4-Acid Digestion
Ga, Gallium (ppm) 11.0 0.68 10.6 11.4 4-Acid Digestion
Hf, Hafnium (ppm) 1.50 0.21 1.37 1.62 4-Acid Digestion
In, Indium (ppm) 0.014 0.002 0.011 0.017 4-Acid Digestion
K, Potassium (wt.%) 2.59 0.116 2.53 2.66 4-Acid Digestion
La, Lanthanum (ppm) 20.3 1.07 19.9 20.8 4-Acid Digestion
Li, Lithium (ppm) 4.82 0.437 4.60 5.04 4-Acid Digestion
Mg, Magnesium (wt.%) 0.231 0.018 0.220 0.241 4-Acid Digestion
Mn, Manganese (wt.%) 0.078 0.002 0.076 0.079 4-Acid Digestion
Mo, Molybdenum (ppm) 6.97 0.337 6.80 7.14 4-Acid Digestion
Na, Sodium (wt.%) 0.234 0.019 0.223 0.246 4-Acid Digestion
Nb, Niobium (ppm) 7.70 0.299 7.51 7.89 4-Acid Digestion
Ni, Nickel (ppm) 8.22 0.87 7.89 8.55 4-Acid Digestion
P, Phosphorus (wt.%) 0.012 0.001 0.011 0.013 4-Acid Digestion
Pb, Lead (ppm) 17.5 0.90 17.2 17.9 4-Acid Digestion
Rb, Rubidium (ppm) 88 3.9 86 89 4-Acid Digestion
Sc, Scandium (ppm) 2.73 0.38 2.46 2.99 4-Acid Digestion
Sn, Tin (ppm) 0.67 0.07 0.63 0.71 4-Acid Digestion
Sr, Strontium (ppm) 124 6 121 127 4-Acid Digestion
Ta, Tantalum (ppm) 0.55 0.07 0.51 0.59 4-Acid Digestion
Tb, Terbium (ppm) 0.43 0.031 0.39 0.47 4-Acid Digestion
Th, Thorium (ppm) 5.57 0.61 5.24 5.89 4-Acid Digestion
Ti, Titanium (wt.%) 0.238 0.013 0.230 0.246 4-Acid Digestion
Tl, Thallium (ppm) 0.43 0.031 0.41 0.45 4-Acid Digestion
U, Uranium (ppm) 39.6 1.51 38.9 40.4 4-Acid Digestion
V, Vanadium (ppm) 21.3 1.43 20.7 22.0 4-Acid Digestion
Y, Yttrium (ppm) 10.1 0.30 10.0 10.3 4-Acid Digestion
Yb, Ytterbium (ppm) 1.03 0.097 0.94 1.12 4-Acid Digestion
Zn, Zinc (ppm) 13.1 2.0 12.0 14.1 4-Acid Digestion
C, Carbon (wt.%) 0.048 0.008 0.044 0.053 Infrared Combustion
LOI1000, Loss On Ignition @1000 °C (wt.%) 2.13 0.171 2.01 2.24 Thermogravimetry
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