OREAS 124

Reference material OREAS 124 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) 1794 74 1738 1850 Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 5.74 0.290 5.63 5.86 Borate / Peroxide Fusion ICP
Ce, Cerium (ppm) 47.6 2.87 45.5 49.8 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 8.99 0.143 8.88 9.10 Borate Fusion XRF
BaO, Barium oxide (ppm) 1131 34 1115 1148 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.123 0.008 0.119 0.126 Borate Fusion XRF
K2O, Potassium oxide (wt.%) 3.23 0.049 3.20 3.27 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 0.382 0.021 0.364 0.400 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.090 0.002 0.090 0.091 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.075 0.005 0.072 0.079 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 81.52 0.685 81.04 82.01 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.441 0.010 0.435 0.447 Borate Fusion XRF
U, Uranium (ppm) 1845 40 1814 1877 Borate Fusion XRF
Al, Aluminium (wt.%) 4.62 0.120 4.53 4.72 Borate / Peroxide Fusion ICP
Ba, Barium (ppm) 1017 34 987 1047 Borate / Peroxide Fusion ICP
Be, Beryllium (ppm) 1.83 0.33 1.62 2.04 Borate / Peroxide Fusion ICP
Ca, Calcium (wt.%) 0.088 0.009 0.079 0.097 Borate / Peroxide Fusion ICP
Cr, Chromium (ppm) 51 10 43 60 Borate / Peroxide Fusion ICP
Dy, Dysprosium (ppm) 2.82 0.170 2.72 2.93 Borate / Peroxide Fusion ICP
Er, Erbium (ppm) 1.60 0.138 1.54 1.67 Borate / Peroxide Fusion ICP
Eu, Europium (ppm) 1.15 0.098 1.07 1.22 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 1.56 0.045 1.53 1.59 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 10.5 0.53 10.2 10.9 Borate / Peroxide Fusion ICP
Gd, Gadolinium (ppm) 3.47 0.346 3.16 3.78 Borate / Peroxide Fusion ICP
Hf, Hafnium (ppm) 6.22 0.414 5.88 6.56 Borate / Peroxide Fusion ICP
Ho, Holmium (ppm) 0.58 0.033 0.56 0.59 Borate / Peroxide Fusion ICP
K, Potassium (wt.%) 2.62 0.058 2.59 2.66 Borate / Peroxide Fusion ICP
La, Lanthanum (ppm) 21.6 1.30 20.6 22.6 Borate / Peroxide Fusion ICP
Lu, Lutetium (ppm) 0.26 0.04 0.22 0.29 Borate / Peroxide Fusion ICP
Mg, Magnesium (wt.%) 0.224 0.006 0.220 0.228 Borate / Peroxide Fusion ICP
Mn, Manganese (wt.%) 0.070 0.001 0.070 0.070 Borate / Peroxide Fusion ICP
Nd, Neodymium (ppm) 20.8 1.44 19.5 22.0 Borate / Peroxide Fusion ICP
P, Phosphorus (wt.%) 0.033 0.003 0.032 0.034 Borate / Peroxide Fusion ICP
Pr, Praseodymium (ppm) 5.39 0.366 5.06 5.73 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 86 3.6 83 89 Borate / Peroxide Fusion ICP
Si, Silicon (wt.%) 38.16 0.906 37.45 38.87 Borate / Peroxide Fusion ICP
Sm, Samarium (ppm) 4.21 0.221 4.08 4.33 Borate / Peroxide Fusion ICP
Tb, Terbium (ppm) 0.48 0.044 0.47 0.49 Borate / Peroxide Fusion ICP
Ti, Titanium (wt.%) 0.254 0.013 0.245 0.264 Borate / Peroxide Fusion ICP
Tm, Thulium (ppm) 0.22 0.021 0.20 0.24 Borate / Peroxide Fusion ICP
V, Vanadium (ppm) 23.3 4.6 18.3 28.2 Borate / Peroxide Fusion ICP
Y, Yttrium (ppm) 14.2 0.61 13.8 14.5 Borate / Peroxide Fusion ICP
Yb, Ytterbium (ppm) 1.63 0.151 1.53 1.73 Borate / Peroxide Fusion ICP
Zr, Zirconium (ppm) 260 21 244 275 Borate / Peroxide Fusion ICP
Al, Aluminium (wt.%) 4.61 0.098 4.57 4.66 4-Acid Digestion
Ba, Barium (ppm) 1046 49 1020 1071 4-Acid Digestion
Be, Beryllium (ppm) 1.94 0.156 1.86 2.03 4-Acid Digestion
Ca, Calcium (wt.%) 0.089 0.006 0.085 0.092 4-Acid Digestion
Ce, Cerium (ppm) 48.9 2.62 47.4 50.4 4-Acid Digestion
Co, Cobalt (ppm) 4.26 0.45 4.00 4.51 4-Acid Digestion
Cr, Chromium (ppm) 37.5 6.8 33.5 41.6 4-Acid Digestion
Cs, Caesium (ppm) 0.78 0.059 0.75 0.81 4-Acid Digestion
Dy, Dysprosium (ppm) 2.71 0.080 2.63 2.79 4-Acid Digestion
Eu, Europium (ppm) 1.23 0.14 1.05 1.42 4-Acid Digestion
Fe, Iron (wt.%) 1.57 0.055 1.54 1.60 4-Acid Digestion
Ga, Gallium (ppm) 11.2 0.74 10.7 11.6 4-Acid Digestion
Hf, Hafnium (ppm) 1.56 0.17 1.46 1.66 4-Acid Digestion
In, Indium (ppm) 0.014 0.002 0.012 0.016 4-Acid Digestion
K, Potassium (wt.%) 2.56 0.116 2.49 2.63 4-Acid Digestion
La, Lanthanum (ppm) 21.4 1.23 20.8 22.1 4-Acid Digestion
Li, Lithium (ppm) 4.61 0.410 4.41 4.80 4-Acid Digestion
Mg, Magnesium (wt.%) 0.221 0.014 0.212 0.229 4-Acid Digestion
Mn, Manganese (wt.%) 0.069 0.002 0.067 0.070 4-Acid Digestion
Mo, Molybdenum (ppm) 7.36 0.296 7.21 7.51 4-Acid Digestion
Na, Sodium (wt.%) 0.232 0.022 0.219 0.245 4-Acid Digestion
Nb, Niobium (ppm) 7.84 0.509 7.55 8.13 4-Acid Digestion
Ni, Nickel (ppm) 9.31 0.754 8.94 9.67 4-Acid Digestion
P, Phosphorus (wt.%) 0.032 0.004 0.030 0.034 4-Acid Digestion
Pb, Lead (ppm) 20.2 1.47 19.5 20.9 4-Acid Digestion
Rb, Rubidium (ppm) 85 7.3 81 89 4-Acid Digestion
Sb, Antimony (ppm) 0.083 0.013 0.080 0.087 4-Acid Digestion
Sc, Scandium (ppm) 3.01 0.089 2.97 3.06 4-Acid Digestion
Sn, Tin (ppm) 0.71 0.041 0.69 0.73 4-Acid Digestion
Sr, Strontium (ppm) 188 10 183 194 4-Acid Digestion
Ta, Tantalum (ppm) 0.56 0.06 0.53 0.59 4-Acid Digestion
Tb, Terbium (ppm) 0.50 0.06 0.45 0.55 4-Acid Digestion
Th, Thorium (ppm) 5.79 0.568 5.48 6.10 4-Acid Digestion
Ti, Titanium (wt.%) 0.252 0.015 0.244 0.260 4-Acid Digestion
Tl, Thallium (ppm) 0.41 0.029 0.40 0.43 4-Acid Digestion
U, Uranium (ppm) 1779 90 1733 1826 4-Acid Digestion
V, Vanadium (ppm) 23.0 1.82 22.1 24.0 4-Acid Digestion
W, Tungsten (ppm) 0.71 0.067 0.67 0.75 4-Acid Digestion
Y, Yttrium (ppm) 12.1 0.68 11.7 12.5 4-Acid Digestion
Zn, Zinc (ppm) 14.3 1.9 13.2 15.4 4-Acid Digestion
Zr, Zirconium (ppm) 49.8 4.79 47.1 52.4 4-Acid Digestion
C, Carbon (wt.%) 0.061 0.009 0.056 0.065 Infrared Combustion
LOI1000, Loss On Ignition @1000°C (wt.%) 2.29 0.34 2.07 2.50 Thermogravimetry
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