OREAS 465

OREAS 465 is a high grade ore, rare earth element (TREO = 9.88%) matrix-matched certified reference material (MMCRM) prepared and certified by Ore Research & Exploration. The materials constituting OREAS 465 were sourced from Lynas Corporation’s Mount Weld Project (the ‘Central Lanthanide Deposit’) which is located 35 kilometres south of Laverton in Western Australia. The Mount Weld source materials (waste, low and medium grade REE ores) were found to be highly hygroscopic to the extent that significant analytical errors would likely result during analysis unless strict moisture handling procedures were adhered. To avoid this complication, the hygroscopic property was destroyed by roasting the materials at 900°C for 2 hours. Following re-equilibration of the materials to laboratory atmosphere the hygroscopic moisture content was deemed acceptable (~0.5% H2O-).

OREAS 465 is one of six MMCRMs ranging TREO 0.53 – 9.88% and contains 100 certified values (and 50 indicative values) including REE’s, majors and traces by fusion XRF, fusion ICP and 4-acid digestion.

A summary of the mineralogy and supergene enrichment processes that operated in the host lateritic rocks is given in the Certificates of Analysis. Two ‘Datapack’ files are provided. The ‘Elemental’ version contains all Certified Values in their elemental form while the other Datapack shows some of the Certified Values in oxide format. This includes the fusion XRF group and the majors and REE’s (and a few other associated metals) in the fusion ICP group.

Analyte Certified Value 1SD 95% Confidence Low 95% Confidence High Method
CeO2, Cerium(IV) oxide (wt.%) 4.86 0.166 4.75 4.96 Borate / Peroxide Fusion ICP
La2O3, Lanthanum(III) oxide (wt.%) 2.83 0.097 2.78 2.88 Borate / Peroxide Fusion ICP
Nd2O3, Neodymium(III) oxide (wt.%) 1.37 0.059 1.34 1.41 Borate / Peroxide Fusion ICP
CeO2, Cerium(IV) oxide (wt.%) 4.88 0.045 4.84 4.92 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 49.96 1.309 48.22 51.70 Borate Fusion XRF
La2O3, Lanthanum(III) oxide (wt.%) 2.84 0.033 2.81 2.87 Borate Fusion XRF
Nd2O3, Neodymium(III) oxide (wt.%) 1.38 0.102 1.28 1.48 Borate Fusion XRF
Pr6O11, Praseodymium(III,IV) oxide (ppm) 4534 144 4362 4705 Borate Fusion XRF
Sm2O3, Samarium(III) oxide (ppm) 1640 136 1500 1780 Borate Fusion XRF
ThO2, Thorium dioxide (ppm) 901 128 757 1045 Borate Fusion XRF
Y2O3, Yttrium(III) oxide (ppm) 637 45 614 661 Borate Fusion XRF
LOI1000, Loss on ignition @1000°C (wt.%) 0.824 0.133 0.697 0.950 Thermogravimetry
Al2O3, Aluminium(III) oxide (wt.%) 12.47 0.494 12.08 12.85 Borate / Peroxide Fusion ICP
BaO, Barium oxide (ppm) 4909 518 4608 5211 Borate / Peroxide Fusion ICP
Be, Beryllium (ppm) 13.2 0.89 12.5 14.0 Borate / Peroxide Fusion ICP
Bi, Bismuth (ppm) 16.9 1.04 16.0 17.9 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 1.26 0.084 1.21 1.31 Borate / Peroxide Fusion ICP
Cr2O3, Chromium(III) oxide (ppm) 795 61 755 836 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) < 0.10 IND IND IND Borate / Peroxide Fusion ICP
Dy2O3, Dysprosium(III) oxide (ppm) 249 14 240 257 Borate / Peroxide Fusion ICP
Er2O3, Erbium(III) oxide (ppm) 58 3.6 56 60 Borate / Peroxide Fusion ICP
Eu2O3, Europium(III) oxide (ppm) 331 13 324 338 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 49.63 0.906 48.84 50.41 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 214 43 166 261 Borate / Peroxide Fusion ICP
Gd2O3, Gadolinium(III) oxide (ppm) 674 35 654 693 Borate / Peroxide Fusion ICP
HfO2, Hafnium dioxide (ppm) 48.8 8.5 42.3 55.4 Borate / Peroxide Fusion ICP
Ho2O3, Holmium(III) oxide (ppm) 31.7 2.44 30.4 33.1 Borate / Peroxide Fusion ICP
In, Indium (ppm) 3.47 0.227 3.32 3.62 Borate / Peroxide Fusion ICP
Lu2O3, Lutetium(III) oxide (ppm) 2.39 0.138 2.34 2.45 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 0.650 0.034 0.625 0.674 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (wt.%) 0.339 0.030 0.318 0.360 Borate / Peroxide Fusion ICP
Mo, Molybdenum (ppm) 114 6 109 119 Borate / Peroxide Fusion ICP
Nb2O5, Niobium(V) oxide (ppm) 6695 431 6383 7007 Borate / Peroxide Fusion ICP
P2O5, Phosphorus(V) oxide (wt.%) 8.74 0.280 8.49 8.98 Borate / Peroxide Fusion ICP
PbO, Lead oxide (ppm) 545 20 534 556 Borate / Peroxide Fusion ICP
Pr6O11, Praseodymium(III,IV) oxide (ppm) 4557 198 4443 4672 Borate / Peroxide Fusion ICP
S, Sulphur (ppm) 1941 132 1787 2095 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 3.28 0.093 3.18 3.39 Borate / Peroxide Fusion ICP
Sm2O3, Samarium(III) oxide (ppm) 1578 42 1560 1597 Borate / Peroxide Fusion ICP
SnO2, Tin dioxide (ppm) 172 26 157 188 Borate / Peroxide Fusion ICP
SrO, Strontium oxide (ppm) 6154 215 6014 6294 Borate / Peroxide Fusion ICP
Ta2O5, Tantalum(V) oxide (ppm) 96 6.2 91 101 Borate / Peroxide Fusion ICP
Tb4O7, Terbium(III,IV) oxide (ppm) 67 3.7 65 69 Borate / Peroxide Fusion ICP
ThO2, Thorium dioxide (ppm) 985 49 956 1013 Borate / Peroxide Fusion ICP
TiO2, Titanium dioxide (wt.%) 10.51 0.307 10.28 10.74 Borate / Peroxide Fusion ICP
Tm2O3, Thulium(III) oxide (ppm) 5.16 0.299 5.02 5.31 Borate / Peroxide Fusion ICP
U3O8, Uranium(V,VI) oxide (ppm) 16.0 0.47 15.8 16.3 Borate / Peroxide Fusion ICP
V2O5, Vanadium(V) oxide (ppm) 953 64 913 994 Borate / Peroxide Fusion ICP
WO3, Tungsten trioxide (ppm) 9.48 1.56 8.20 10.76 Borate / Peroxide Fusion ICP
Y2O3, Yttrium(III) oxide (ppm) 665 42 640 691 Borate / Peroxide Fusion ICP
Yb2O3, Ytterbium(III) oxide (ppm) 21.6 0.83 21.2 22.0 Borate / Peroxide Fusion ICP
ZrO2, Zirconium dioxide (ppm) 2539 274 2280 2798 Borate / Peroxide Fusion ICP
Ag, Silver (ppm) 5.48 0.353 5.30 5.67 4-Acid Digestion
Al, Aluminium (wt.%) 6.21 0.399 6.00 6.42 4-Acid Digestion
Ba, Barium (ppm) 4359 158 4270 4448 4-Acid Digestion
Be, Beryllium (ppm) 11.6 0.76 11.2 12.1 4-Acid Digestion
Bi, Bismuth (ppm) 17.3 1.03 16.7 17.9 4-Acid Digestion
Ca, Calcium (wt.%) 0.872 0.062 0.830 0.914 4-Acid Digestion
Cd, Cadmium (ppm) 1.20 0.14 1.12 1.28 4-Acid Digestion
Ce, Cerium (wt.%) 3.91 0.149 3.76 4.05 4-Acid Digestion
Co, Cobalt (ppm) 18.7 1.26 18.1 19.3 4-Acid Digestion
Cs, Caesium (ppm) < 0.10 IND IND IND 4-Acid Digestion
Cu, Copper (ppm) 128 5 125 130 4-Acid Digestion
Dy, Dysprosium (ppm) 215 9 210 220 4-Acid Digestion
Er, Erbium (ppm) 47.3 2.51 45.8 48.7 4-Acid Digestion
Eu, Europium (ppm) 282 12 275 290 4-Acid Digestion
Fe, Iron (wt.%) 29.55 2.025 28.38 30.73 4-Acid Digestion
Ga, Gallium (ppm) 188 31 157 220 4-Acid Digestion
Gd, Gadolinium (ppm) 581 36 556 606 4-Acid Digestion
Hf, Hafnium (ppm) 14.4 1.9 13.7 15.1 4-Acid Digestion
Ho, Holmium (ppm) 26.8 0.94 26.3 27.2 4-Acid Digestion
In, Indium (ppm) 3.18 0.208 3.06 3.31 4-Acid Digestion
La, Lanthanum (wt.%) 2.27 0.093 2.15 2.39 4-Acid Digestion
Li, Lithium (ppm) 3.04 0.33 2.80 3.28 4-Acid Digestion
Lu, Lutetium (ppm) 1.72 0.28 1.54 1.90 4-Acid Digestion
Mg, Magnesium (wt.%) 0.374 0.026 0.356 0.391 4-Acid Digestion
Mn, Manganese (wt.%) 0.198 0.022 0.181 0.215 4-Acid Digestion
Mo, Molybdenum (ppm) 98 10 92 105 4-Acid Digestion
Na, Sodium (wt.%) < 0.200 IND IND IND 4-Acid Digestion
Nd, Neodymium (wt.%) 1.10 0.043 1.05 1.14 4-Acid Digestion
Ni, Nickel (ppm) 106 14 95 116 4-Acid Digestion
P, Phosphorus (wt.%) 3.15 0.376 2.83 3.47 4-Acid Digestion
Pb, Lead (ppm) 573 16 562 583 4-Acid Digestion
Pr, Praseodymium (ppm) 3670 193 3488 3852 4-Acid Digestion
Rb, Rubidium (ppm) 0.43 0.05 0.40 0.45 4-Acid Digestion
Re, Rhenium (ppm) < 0.050 IND IND IND 4-Acid Digestion
Sc, Scandium (ppm) 149 9 143 154 4-Acid Digestion
Sm, Samarium (ppm) 1307 81 1230 1383 4-Acid Digestion
Sr, Strontium (wt.%) 0.505 0.026 0.487 0.523 4-Acid Digestion
Tb, Terbium (ppm) 57 3.3 55 59 4-Acid Digestion
Te, Tellurium (ppm) < 1.00 IND IND IND 4-Acid Digestion
Th, Thorium (ppm) 805 150 693 916 4-Acid Digestion
Tl, Thallium (ppm) 0.087 0.009 0.082 0.093 4-Acid Digestion
Tm, Thulium (ppm) 3.82 0.274 3.65 4.00 4-Acid Digestion
U, Uranium (ppm) 12.6 0.68 12.2 13.0 4-Acid Digestion
V, Vanadium (ppm) 427 69 380 473 4-Acid Digestion
Y, Yttrium (ppm) 478 32 455 500 4-Acid Digestion
Yb, Ytterbium (ppm) 14.9 0.95 14.3 15.5 4-Acid Digestion
Zn, Zinc (ppm) 921 133 841 1001 4-Acid Digestion
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