OREAS 464

OREAS 464 is a high grade ore, rare earth element (TREO = 5.10%) matrix-matched certified reference material (MMCRM) prepared and certified by Ore Research & Exploration. The materials constituting OREAS 464 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 464 is one of six MMCRMs ranging TREO 0.53 – 9.88% and contains 113 certified values (and 51 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.%) 1.88 0.065 1.84 1.92 Borate / Peroxide Fusion ICP
La2O3, Lanthanum(III) oxide (wt.%) 1.37 0.037 1.36 1.39 Borate / Peroxide Fusion ICP
Nd2O3, Neodymium(III) oxide (wt.%) 1.16 0.037 1.14 1.18 Borate / Peroxide Fusion ICP
CeO2, Cerium(IV) oxide (wt.%) 1.89 0.027 1.87 1.92 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 54.38 1.031 52.99 55.77 Borate Fusion XRF
La2O3, Lanthanum(III) oxide (wt.%) 1.41 0.020 1.39 1.42 Borate Fusion XRF
Nd2O3, Neodymium(III) oxide (wt.%) 1.12 0.036 1.08 1.16 Borate Fusion XRF
Pr6O11, Praseodymium(III,IV) oxide (ppm) 3070 99 2987 3152 Borate Fusion XRF
Sm2O3, Samarium(III) oxide (ppm) 1635 55 1584 1685 Borate Fusion XRF
ThO2, Thorium dioxide (ppm) 576 84 492 660 Borate Fusion XRF
Y2O3, Yttrium(III) oxide (ppm) 562 69 502 622 Borate Fusion XRF
LOI1000, Loss On Ignition @1000°C (wt.%) 0.697 0.071 0.608 0.786 Thermogravimetry
Al2O3, Aluminium(III) oxide (wt.%) 8.75 0.284 8.54 8.96 Borate / Peroxide Fusion ICP
BaO, Barium oxide (ppm) 1850 77 1802 1897 Borate / Peroxide Fusion ICP
Be, Beryllium (ppm) 15.6 1.6 14.1 17.1 Borate / Peroxide Fusion ICP
Bi, Bismuth (ppm) 3.80 0.43 3.34 4.25 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 1.25 0.046 1.22 1.28 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 18.0 3.4 14.8 21.3 Borate / Peroxide Fusion ICP
Cr2O3, Chromium(III) oxide (ppm) 577 32 557 597 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) 0.27 0.04 0.24 0.30 Borate / Peroxide Fusion ICP
Dy2O3, Dysprosium(III) oxide (ppm) 204 9 199 210 Borate / Peroxide Fusion ICP
Er2O3, Erbium(III) oxide (ppm) 43.6 1.49 42.8 44.5 Borate / Peroxide Fusion ICP
Eu2O3, Europium(III) oxide (ppm) 375 10 371 379 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 53.24 1.440 52.15 54.33 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 106 21 80 132 Borate / Peroxide Fusion ICP
Gd2O3, Gadolinium(III) oxide (ppm) 779 35 758 801 Borate / Peroxide Fusion ICP
HfO2, Hafnium dioxide (ppm) 14.8 0.91 14.2 15.3 Borate / Peroxide Fusion ICP
Ho2O3, Holmium(III) oxide (ppm) 24.4 1.54 23.5 25.3 Borate / Peroxide Fusion ICP
In, Indium (ppm) 2.14 0.163 2.00 2.28 Borate / Peroxide Fusion ICP
K2O, Potassium oxide (wt.%) 0.104 0.019 0.083 0.125 Borate / Peroxide Fusion ICP
Lu2O3, Lutetium(III) oxide (ppm) 1.92 0.112 1.87 1.97 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 1.40 0.063 1.36 1.45 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (wt.%) 0.365 0.025 0.345 0.384 Borate / Peroxide Fusion ICP
Mo, Molybdenum (ppm) 77 4.3 73 81 Borate / Peroxide Fusion ICP
Nb2O5, Niobium(V) oxide (ppm) 2723 115 2637 2809 Borate / Peroxide Fusion ICP
NiO, Nickel oxide (ppm) 104 20 86 123 Borate / Peroxide Fusion ICP
P2O5, Phosphorus(V) oxide (wt.%) 3.23 0.103 3.15 3.31 Borate / Peroxide Fusion ICP
PbO, Lead oxide (ppm) 187 13 172 202 Borate / Peroxide Fusion ICP
Pr6O11, Praseodymium(III,IV) oxide (ppm) 3138 128 3063 3213 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 4.39 0.46 4.17 4.60 Borate / Peroxide Fusion ICP
S, Sulphur (ppm) 1028 91 940 1117 Borate / Peroxide Fusion ICP
Sb, Antimony (ppm) 1.80 0.25 1.49 2.11 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 20.36 0.629 19.69 21.03 Borate / Peroxide Fusion ICP
Sm2O3, Samarium(III) oxide (ppm) 1738 44 1719 1756 Borate / Peroxide Fusion ICP
SnO2, Tin dioxide (ppm) 58 3.4 56 60 Borate / Peroxide Fusion ICP
SrO, Strontium oxide (ppm) 2437 82 2387 2486 Borate / Peroxide Fusion ICP
Ta2O5, Tantalum(V) oxide (ppm) 29.7 4.2 26.9 32.5 Borate / Peroxide Fusion ICP
Tb4O7, Terbium(III,IV) oxide (ppm) 63 3.2 61 65 Borate / Peroxide Fusion ICP
ThO2, Thorium dioxide (ppm) 600 27 585 615 Borate / Peroxide Fusion ICP
TiO2, Titanium dioxide (wt.%) 3.26 0.099 3.18 3.33 Borate / Peroxide Fusion ICP
Tm2O3, Thulium(III) oxide (ppm) 4.06 0.199 3.95 4.18 Borate / Peroxide Fusion ICP
U3O8, Uranium(V,VI) oxide (ppm) 20.7 0.49 20.5 21.0 Borate / Peroxide Fusion ICP
V2O5, Vanadium(V) oxide (ppm) 412 34 393 432 Borate / Peroxide Fusion ICP
WO3, Tungsten trioxide (ppm) < 7.00 IND IND IND Borate / Peroxide Fusion ICP
Y2O3, Yttrium(III) oxide (ppm) 570 27 553 586 Borate / Peroxide Fusion ICP
Yb2O3, Ytterbium(III) oxide (ppm) 17.9 1.13 17.4 18.5 Borate / Peroxide Fusion ICP
ZnO, Zinc oxide (ppm) 1533 119 1376 1690 Borate / Peroxide Fusion ICP
ZrO2, Zirconium dioxide (ppm) 624 23 605 642 Borate / Peroxide Fusion ICP
Ag, Silver (ppm) 4.43 0.362 4.17 4.69 4-Acid Digestion
Al, Aluminium (wt.%) 4.47 0.096 4.42 4.52 4-Acid Digestion
As, Arsenic (ppm) 32.9 4.7 29.0 36.8 4-Acid Digestion
Ba, Barium (ppm) 1648 72 1609 1687 4-Acid Digestion
Be, Beryllium (ppm) 15.2 1.19 14.4 16.0 4-Acid Digestion
Bi, Bismuth (ppm) 4.05 0.236 3.90 4.21 4-Acid Digestion
Ca, Calcium (wt.%) 0.851 0.059 0.811 0.891 4-Acid Digestion
Cd, Cadmium (ppm) 0.52 0.09 0.46 0.58 4-Acid Digestion
Ce, Cerium (wt.%) 1.55 0.048 1.50 1.60 4-Acid Digestion
Co, Cobalt (ppm) 17.0 0.93 16.6 17.4 4-Acid Digestion
Cr, Chromium (ppm) 335 37 303 367 4-Acid Digestion
Cs, Caesium (ppm) 0.29 0.018 0.28 0.30 4-Acid Digestion
Cu, Copper (ppm) 92 2.2 90 93 4-Acid Digestion
Dy, Dysprosium (ppm) 182 7 177 186 4-Acid Digestion
Er, Erbium (ppm) 36.9 1.55 35.9 38.0 4-Acid Digestion
Eu, Europium (ppm) 334 19 322 347 4-Acid Digestion
Fe, Iron (wt.%) 35.55 1.569 34.62 36.48 4-Acid Digestion
Gd, Gadolinium (ppm) 670 26 651 689 4-Acid Digestion
Hf, Hafnium (ppm) 7.79 1.32 6.74 8.85 4-Acid Digestion
Ho, Holmium (ppm) 21.3 0.93 20.7 21.9 4-Acid Digestion
In, Indium (ppm) 2.11 0.118 2.04 2.19 4-Acid Digestion
K, Potassium (wt.%) 0.081 0.014 0.072 0.090 4-Acid Digestion
La, Lanthanum (wt.%) 1.06 0.213 0.86 1.27 4-Acid Digestion
Li, Lithium (ppm) 8.26 1.07 7.58 8.93 4-Acid Digestion
Lu, Lutetium (ppm) 1.57 0.30 1.38 1.77 4-Acid Digestion
Mg, Magnesium (wt.%) 0.825 0.045 0.795 0.855 4-Acid Digestion
Mn, Manganese (wt.%) 0.270 0.016 0.258 0.282 4-Acid Digestion
Mo, Molybdenum (ppm) 77 4.4 74 80 4-Acid Digestion
Na, Sodium (wt.%) 0.149 0.011 0.142 0.155 4-Acid Digestion
Nd, Neodymium (wt.%) 0.959 0.026 0.942 0.976 4-Acid Digestion
Ni, Nickel (ppm) 89 6.5 84 93 4-Acid Digestion
P, Phosphorus (wt.%) 1.36 0.067 1.31 1.41 4-Acid Digestion
Pb, Lead (ppm) 205 32 184 226 4-Acid Digestion
Pr, Praseodymium (ppm) 2601 87 2516 2685 4-Acid Digestion
Rb, Rubidium (ppm) 4.22 0.393 3.97 4.47 4-Acid Digestion
Re, Rhenium (ppm) < 0.030 IND IND IND 4-Acid Digestion
S, Sulphur (ppm) 983 79 934 1033 4-Acid Digestion
Sb, Antimony (ppm) 1.87 0.111 1.80 1.94 4-Acid Digestion
Sc, Scandium (ppm) 141 6 137 145 4-Acid Digestion
Se, Selenium (ppm) < 50 IND IND IND 4-Acid Digestion
Sm, Samarium (ppm) 1485 49 1438 1532 4-Acid Digestion
Sn, Tin (ppm) 35.7 3.21 33.5 37.8 4-Acid Digestion
Sr, Strontium (ppm) 2043 144 1944 2142 4-Acid Digestion
Ta, Tantalum (ppm) 20.9 2.7 18.6 23.2 4-Acid Digestion
Tb, Terbium (ppm) 55 2.5 53 57 4-Acid Digestion
Te, Tellurium (ppm) 0.36 0.07 0.30 0.42 4-Acid Digestion
Th, Thorium (ppm) 506 60 459 554 4-Acid Digestion
Ti, Titanium (wt.%) < 1.00 IND IND IND 4-Acid Digestion
Tl, Thallium (ppm) 0.15 0.013 0.14 0.15 4-Acid Digestion
Tm, Thulium (ppm) 3.30 0.321 3.08 3.51 4-Acid Digestion
U, Uranium (ppm) 17.6 0.61 17.2 18.0 4-Acid Digestion
V, Vanadium (ppm) 207 26 188 226 4-Acid Digestion
W, Tungsten (ppm) 2.37 0.40 2.10 2.64 4-Acid Digestion
Y, Yttrium (ppm) 449 33 425 473 4-Acid Digestion
Yb, Ytterbium (ppm) 14.3 0.94 13.6 15.0 4-Acid Digestion
Zn, Zinc (ppm) 1128 57 1090 1166 4-Acid Digestion
Zr, Zirconium (ppm) 210 40 179 240 4-Acid Digestion
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