OREAS 121
SKU: 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)
Specifications
- State: oxide
- Matrix: sandstone/ sediments
- Mineralisation: sedimentary and hydrothermal
- CRM Group: U ore
Certified Values
| Analyte | Certified Value | 1SD | 95% CL Low | 95% CL 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 |
Product Specifications
Certified Reference Values
| Analyte | Certified Value | Uncertainty (1SD) | 95% Confidence Low | 95% Confidence High | Method |
|---|---|---|---|---|---|
| Ce - Cerium (ppm) | 44.7 | - | - | - | 4-Acid Digestion |
| Dy - Dysprosium (ppm) | 2.32 | - | - | - | 4-Acid Digestion |
| Eu - Europium (ppm) | 1.11 | - | - | - | 4-Acid Digestion |
| La - Lanthanum (ppm) | 20.6 | - | - | - | 4-Acid Digestion |
| Tb - Terbium (ppm) | 0.41 | - | - | - | 4-Acid Digestion |
| Y - Yttrium (ppm) | 10.5 | - | - | - | 4-Acid Digestion |
| Yb - Ytterbium (ppm) | 1.07 | - | - | - | 4-Acid Digestion |
SD = Standard Deviation | CL = 95% Confidence Limits
Methods: AR = Aqua Regia, 4-Acid = 4-Acid Digestion, LBF = Lithium Borate Fusion, FA/AAS = Fire Assay with Atomic Absorption, LECO = LECO Combustion Analysis
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