OREAS 121

Reference material OREAS 121 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) 215 12 206 224 Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 5.57 0.63 5.12 6.02 Borate / Peroxide Fusion ICP
Ce, Cerium (ppm) 45.6 3.27 43.4 47.8 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 9.11 0.144 9.00 9.22 Borate Fusion XRF
BaO, Barium oxide (ppm) 1105 44 1074 1137 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.106 0.009 0.100 0.113 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 2.32 0.031 2.30 2.35 Borate Fusion XRF
K2O, Potassium oxide (wt.%) 3.29 0.048 3.26 3.33 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 0.426 0.028 0.405 0.448 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.102 0.002 0.101 0.104 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 81.46 0.795 80.88 82.05 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.429 0.012 0.421 0.437 Borate Fusion XRF
U, Uranium (ppm) 215 10 208 222 Borate Fusion XRF
Al, Aluminium (wt.%) 4.61 0.214 4.44 4.77 Borate / Peroxide Fusion ICP
Ba, Barium (ppm) 975 34 937 1012 Borate / Peroxide Fusion ICP
Ca, Calcium (wt.%) 0.083 0.006 0.077 0.089 Borate / Peroxide Fusion ICP
Dy, Dysprosium (ppm) 2.46 0.201 2.30 2.61 Borate / Peroxide Fusion ICP
Er, Erbium (ppm) 1.37 0.114 1.28 1.46 Borate / Peroxide Fusion ICP
Eu, Europium (ppm) 1.03 0.099 0.95 1.11 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 1.62 0.034 1.60 1.63 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 10.4 0.58 9.9 10.9 Borate / Peroxide Fusion ICP
Gd, Gadolinium (ppm) 3.07 0.46 2.81 3.33 Borate / Peroxide Fusion ICP
Hf, Hafnium (ppm) 6.21 0.66 5.66 6.75 Borate / Peroxide Fusion ICP
Ho, Holmium (ppm) 0.49 0.047 0.46 0.51 Borate / Peroxide Fusion ICP
K, Potassium (wt.%) 2.70 0.094 2.63 2.76 Borate / Peroxide Fusion ICP
La, Lanthanum (ppm) 20.8 1.72 19.7 22.0 Borate / Peroxide Fusion ICP
Lu, Lutetium (ppm) 0.21 0.021 0.20 0.23 Borate / Peroxide Fusion ICP
Mg, Magnesium (wt.%) 0.247 0.010 0.240 0.254 Borate / Peroxide Fusion ICP
Nd, Neodymium (ppm) 19.1 1.20 18.1 20.0 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 86 3.1 83 89 Borate / Peroxide Fusion ICP
Si, Silicon (wt.%) 37.45 0.536 37.01 37.89 Borate / Peroxide Fusion ICP
Sm, Samarium (ppm) 3.68 0.242 3.49 3.87 Borate / Peroxide Fusion ICP
Sr, Strontium (ppm) 135 5 129 140 Borate / Peroxide Fusion ICP
Tb, Terbium (ppm) 0.43 0.030 0.41 0.45 Borate / Peroxide Fusion ICP
Ti, Titanium (wt.%) 0.250 0.008 0.244 0.257 Borate / Peroxide Fusion ICP
Tm, Thulium (ppm) 0.20 0.010 0.19 0.20 Borate / Peroxide Fusion ICP
Y, Yttrium (ppm) 12.6 0.63 12.3 13.0 Borate / Peroxide Fusion ICP
Yb, Ytterbium (ppm) 1.42 0.109 1.37 1.47 Borate / Peroxide Fusion ICP
Zr, Zirconium (ppm) 261 24 241 281 Borate / Peroxide Fusion ICP
Al, Aluminium (wt.%) 4.59 0.230 4.46 4.73 4-Acid Digestion
Ba, Barium (ppm) 1009 52 981 1037 4-Acid Digestion
Be, Beryllium (ppm) 1.55 0.112 1.48 1.61 4-Acid Digestion
Ca, Calcium (wt.%) 0.077 0.005 0.075 0.079 4-Acid Digestion
Ce, Cerium (ppm) 44.7 3.63 42.7 46.6 4-Acid Digestion
Co, Cobalt (ppm) 4.36 0.362 4.16 4.57 4-Acid Digestion
Cr, Chromium (ppm) 34.7 6.7 30.8 38.7 4-Acid Digestion
Cs, Caesium (ppm) 0.75 0.046 0.72 0.78 4-Acid Digestion
Dy, Dysprosium (ppm) 2.32 0.167 2.13 2.51 4-Acid Digestion
Eu, Europium (ppm) 1.11 0.12 0.96 1.26 4-Acid Digestion
Fe, Iron (wt.%) 1.59 0.052 1.56 1.62 4-Acid Digestion
Ga, Gallium (ppm) 11.1 0.81 10.6 11.5 4-Acid Digestion
Hf, Hafnium (ppm) 1.52 0.20 1.40 1.64 4-Acid Digestion
K, Potassium (wt.%) 2.57 0.143 2.47 2.66 4-Acid Digestion
La, Lanthanum (ppm) 20.6 1.13 20.0 21.2 4-Acid Digestion
Li, Lithium (ppm) 4.79 0.57 4.54 5.05 4-Acid Digestion
Mg, Magnesium (wt.%) 0.240 0.017 0.229 0.250 4-Acid Digestion
Mn, Manganese (wt.%) 0.078 0.002 0.077 0.079 4-Acid Digestion
Mo, Molybdenum (ppm) 7.43 0.289 7.30 7.57 4-Acid Digestion
Na, Sodium (wt.%) 0.239 0.023 0.226 0.252 4-Acid Digestion
Nb, Niobium (ppm) 7.77 0.308 7.66 7.88 4-Acid Digestion
Ni, Nickel (ppm) 8.83 0.784 8.44 9.21 4-Acid Digestion
P, Phosphorus (wt.%) 0.014 0.001 0.014 0.015 4-Acid Digestion
Pb, Lead (ppm) 17.4 1.01 17.0 17.8 4-Acid Digestion
Rb, Rubidium (ppm) 87 5.0 84 89 4-Acid Digestion
Sb, Antimony (ppm) 0.068 0.010 0.058 0.079 4-Acid Digestion
Sc, Scandium (ppm) 2.92 0.139 2.81 3.02 4-Acid Digestion
Sn, Tin (ppm) 0.67 0.046 0.64 0.69 4-Acid Digestion
Sr, Strontium (ppm) 130 7 127 134 4-Acid Digestion
Ta, Tantalum (ppm) 0.53 0.045 0.51 0.56 4-Acid Digestion
Tb, Terbium (ppm) 0.41 0.07 0.39 0.43 4-Acid Digestion
Th, Thorium (ppm) 5.57 0.525 5.28 5.86 4-Acid Digestion
Ti, Titanium (wt.%) 0.243 0.012 0.236 0.250 4-Acid Digestion
Tl, Thallium (ppm) 0.43 0.034 0.41 0.45 4-Acid Digestion
U, Uranium (ppm) 206 7 202 209 4-Acid Digestion
V, Vanadium (ppm) 21.6 1.42 20.9 22.2 4-Acid Digestion
W, Tungsten (ppm) 0.39 0.04 0.37 0.42 4-Acid Digestion
Y, Yttrium (ppm) 10.5 0.56 10.2 10.7 4-Acid Digestion
Yb, Ytterbium (ppm) 1.07 0.086 1.00 1.14 4-Acid Digestion
Zn, Zinc (ppm) 13.1 1.7 12.2 14.1 4-Acid Digestion
C, Carbon (wt.%) 0.045 0.009 0.041 0.050 Infrared Combustion
LOI1000, Loss On Ignition @1000 °C (wt.%) 2.15 0.185 2.03 2.27 Thermogravimetry
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