OREAS 463

OREAS 463 is an ore grade, rare earth element (TREO = 2.08%) matrix-matched certified reference material (MMCRM) prepared and certified by Ore Research & Exploration. The materials constituting OREAS 463 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 463 is one of six MMCRMs ranging TREO 0.53 – 9.88% and contains 113 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.%) 0.810 0.019 0.801 0.818 Borate / Peroxide Fusion ICP
La2O3, Lanthanum(III) oxide (ppm) 5824 163 5744 5904 Borate / Peroxide Fusion ICP
Nd2O3, Neodymium(III) oxide (ppm) 4295 215 4173 4418 Borate / Peroxide Fusion ICP
CeO2, Cerium(IV) oxide (wt.%) 0.815 0.016 0.803 0.828 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 49.48 1.113 47.98 50.98 Borate Fusion XRF
La2O3, Lanthanum(III) oxide (ppm) 5917 96 5835 5998 Borate Fusion XRF
Nd2O3, Neodymium(III) oxide (ppm) 4330 230 4114 4546 Borate Fusion XRF
Pr6O11, Praseodymium(III,IV) oxide (ppm) 1201 80 1113 1289 Borate Fusion XRF
Sm2O3, Samarium(III) oxide (ppm) 597 107 488 705 Borate Fusion XRF
ThO2, Thorium dioxide (ppm) 364 51 312 415 Borate Fusion XRF
LOI1000, Loss on ignition @1000°C (wt.%) 0.781 0.075 0.681 0.881 Thermogravimetry
Al2O3, Aluminium(III) oxide (wt.%) 10.64 0.396 10.35 10.93 Borate / Peroxide Fusion ICP
BaO, Barium oxide (ppm) 1235 78 1193 1277 Borate / Peroxide Fusion ICP
Be, Beryllium (ppm) 5.62 0.420 5.50 5.75 Borate / Peroxide Fusion ICP
Bi, Bismuth (ppm) 2.75 0.38 2.39 3.12 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 1.71 0.081 1.66 1.76 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 15.2 2.6 12.6 17.7 Borate / Peroxide Fusion ICP
Cr2O3, Chromium(III) oxide (ppm) 838 47 807 870 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) 0.42 0.05 0.39 0.46 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 74 16 67 82 Borate / Peroxide Fusion ICP
Dy2O3, Dysprosium(III) oxide (ppm) 81 3.8 79 83 Borate / Peroxide Fusion ICP
Er2O3, Erbium(III) oxide (ppm) 18.3 1.22 17.6 19.0 Borate / Peroxide Fusion ICP
Eu2O3, Europium(III) oxide (ppm) 133 5 130 136 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 49.29 1.915 47.84 50.73 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 63 6 54 72 Borate / Peroxide Fusion ICP
Gd2O3, Gadolinium(III) oxide (ppm) 278 15 269 287 Borate / Peroxide Fusion ICP
HfO2, Hafnium dioxide (ppm) 16.3 0.54 16.0 16.5 Borate / Peroxide Fusion ICP
Ho2O3, Holmium(III) oxide (ppm) 9.98 0.650 9.61 10.35 Borate / Peroxide Fusion ICP
In, Indium (ppm) 1.01 0.072 1.00 1.02 Borate / Peroxide Fusion ICP
K2O, Potassium oxide (wt.%) 0.143 0.025 0.123 0.164 Borate / Peroxide Fusion ICP
Li, Lithium (ppm) 10.4 1.9 8.4 12.5 Borate / Peroxide Fusion ICP
Lu2O3, Lutetium(III) oxide (ppm) 0.90 0.046 0.88 0.92 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 1.70 0.090 1.63 1.76 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (wt.%) 0.156 0.012 0.147 0.165 Borate / Peroxide Fusion ICP
Mo, Molybdenum (ppm) 56 2.4 54 58 Borate / Peroxide Fusion ICP
Nb2O5, Niobium(V) oxide (ppm) 2139 105 2066 2213 Borate / Peroxide Fusion ICP
NiO, Nickel oxide (ppm) 90 14 77 103 Borate / Peroxide Fusion ICP
P2O5, Phosphorus(V) oxide (wt.%) 1.44 0.054 1.40 1.49 Borate / Peroxide Fusion ICP
PbO, Lead oxide (ppm) 132 7 125 138 Borate / Peroxide Fusion ICP
Pr6O11, Praseodymium(III,IV) oxide (ppm) 1212 52 1184 1241 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 6.08 0.336 5.92 6.24 Borate / Peroxide Fusion ICP
S, Sulphur (ppm) 671 104 588 754 Borate / Peroxide Fusion ICP
Sb, Antimony (ppm) 2.31 0.40 2.03 2.59 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 27.50 0.839 26.82 28.17 Borate / Peroxide Fusion ICP
Sm2O3, Samarium(III) oxide (ppm) 624 13 619 628 Borate / Peroxide Fusion ICP
SnO2, Tin dioxide (ppm) 39.9 3.93 37.3 42.4 Borate / Peroxide Fusion ICP
SrO, Strontium oxide (ppm) 1136 30 1120 1153 Borate / Peroxide Fusion ICP
Ta2O5, Tantalum(V) oxide (ppm) 30.8 1.56 30.1 31.5 Borate / Peroxide Fusion ICP
Tb4O7, Terbium(III,IV) oxide (ppm) 23.9 1.12 23.3 24.5 Borate / Peroxide Fusion ICP
ThO2, Thorium dioxide (ppm) 332 13 325 340 Borate / Peroxide Fusion ICP
TiO2, Titanium dioxide (wt.%) 3.21 0.114 3.12 3.29 Borate / Peroxide Fusion ICP
Tm2O3, Thulium(III) oxide (ppm) 1.80 0.115 1.74 1.85 Borate / Peroxide Fusion ICP
U3O8, Uranium(V,VI) oxide (ppm) 9.26 0.346 9.08 9.44 Borate / Peroxide Fusion ICP
V2O5, Vanadium(V) oxide (ppm) 643 37 622 664 Borate / Peroxide Fusion ICP
WO3, Tungsten trioxide (ppm) 4.71 0.88 4.03 5.40 Borate / Peroxide Fusion ICP
Y2O3, Yttrium(III) oxide (ppm) 229 10 223 235 Borate / Peroxide Fusion ICP
Yb2O3, Ytterbium(III) oxide (ppm) 8.00 0.471 7.76 8.24 Borate / Peroxide Fusion ICP
ZnO, Zinc oxide (ppm) 526 67 453 599 Borate / Peroxide Fusion ICP
ZrO2, Zirconium dioxide (ppm) 778 33 756 801 Borate / Peroxide Fusion ICP
Ag, Silver (ppm) < 3.00 IND IND IND 4-Acid Digestion
Al, Aluminium (wt.%) 5.47 0.121 5.41 5.53 4-Acid Digestion
As, Arsenic (ppm) 31.3 1.75 30.0 32.5 4-Acid Digestion
Ba, Barium (ppm) 1135 46 1110 1160 4-Acid Digestion
Be, Beryllium (ppm) 5.32 0.56 4.99 5.65 4-Acid Digestion
Bi, Bismuth (ppm) 2.93 0.180 2.81 3.04 4-Acid Digestion
Ca, Calcium (wt.%) 1.19 0.072 1.14 1.23 4-Acid Digestion
Ce, Cerium (wt.%) 0.654 0.022 0.632 0.676 4-Acid Digestion
Co, Cobalt (ppm) 13.5 0.61 13.2 13.9 4-Acid Digestion
Cr, Chromium (ppm) 460 86 401 520 4-Acid Digestion
Cs, Caesium (ppm) 0.42 0.06 0.39 0.46 4-Acid Digestion
Cu, Copper (ppm) 65 3.2 64 67 4-Acid Digestion
Dy, Dysprosium (ppm) 71 2.4 69 72 4-Acid Digestion
Er, Erbium (ppm) 14.8 0.56 14.5 15.2 4-Acid Digestion
Eu, Europium (ppm) 121 7 116 126 4-Acid Digestion
Fe, Iron (wt.%) 33.33 1.079 32.68 33.99 4-Acid Digestion
Gd, Gadolinium (ppm) 244 11 237 252 4-Acid Digestion
Hf, Hafnium (ppm) 7.40 0.88 6.71 8.09 4-Acid Digestion
Ho, Holmium (ppm) 8.37 0.469 8.08 8.67 4-Acid Digestion
In, Indium (ppm) 0.95 0.061 0.92 0.99 4-Acid Digestion
K, Potassium (wt.%) 0.109 0.009 0.104 0.115 4-Acid Digestion
La, Lanthanum (ppm) 4773 277 4548 4997 4-Acid Digestion
Li, Lithium (ppm) 10.5 1.2 9.8 11.2 4-Acid Digestion
Lu, Lutetium (ppm) 0.67 0.10 0.61 0.73 4-Acid Digestion
Mg, Magnesium (wt.%) 1.01 0.069 0.96 1.06 4-Acid Digestion
Mn, Manganese (wt.%) 0.112 0.008 0.106 0.117 4-Acid Digestion
Mo, Molybdenum (ppm) 57 3.6 55 60 4-Acid Digestion
Na, Sodium (wt.%) 0.173 0.011 0.166 0.179 4-Acid Digestion
Nd, Neodymium (ppm) 3611 108 3542 3680 4-Acid Digestion
Ni, Nickel (ppm) 76 4.4 74 79 4-Acid Digestion
P, Phosphorus (wt.%) 0.590 0.054 0.553 0.627 4-Acid Digestion
Pb, Lead (ppm) 130 5 126 134 4-Acid Digestion
Pr, Praseodymium (ppm) 986 36 963 1008 4-Acid Digestion
Rb, Rubidium (ppm) 6.11 0.580 5.78 6.44 4-Acid Digestion
Re, Rhenium (ppm) < 0.020 IND IND IND 4-Acid Digestion
S, Sulphur (ppm) 624 46 600 649 4-Acid Digestion
Sb, Antimony (ppm) 2.14 0.22 2.00 2.29 4-Acid Digestion
Sc, Scandium (ppm) 66 3.4 64 68 4-Acid Digestion
Se, Selenium (ppm) < 20.0 IND IND IND 4-Acid Digestion
Sm, Samarium (ppm) 531 21 518 543 4-Acid Digestion
Sn, Tin (ppm) 25.6 2.47 23.9 27.3 4-Acid Digestion
Sr, Strontium (ppm) 934 67 891 977 4-Acid Digestion
Ta, Tantalum (ppm) 21.7 2.3 19.7 23.6 4-Acid Digestion
Tb, Terbium (ppm) 20.6 0.87 20.1 21.1 4-Acid Digestion
Te, Tellurium (ppm) 0.35 0.06 0.31 0.40 4-Acid Digestion
Th, Thorium (ppm) 291 10 285 297 4-Acid Digestion
Ti, Titanium (wt.%) 0.876 0.163 0.762 0.989 4-Acid Digestion
Tl, Thallium (ppm) 0.094 0.011 0.091 0.097 4-Acid Digestion
Tm, Thulium (ppm) 1.33 0.117 1.26 1.41 4-Acid Digestion
U, Uranium (ppm) 7.55 0.368 7.32 7.77 4-Acid Digestion
V, Vanadium (ppm) 327 26 309 345 4-Acid Digestion
W, Tungsten (ppm) 2.45 0.38 2.19 2.70 4-Acid Digestion
Y, Yttrium (ppm) 176 10 169 183 4-Acid Digestion
Yb, Ytterbium (ppm) 5.86 0.346 5.65 6.07 4-Acid Digestion
Zn, Zinc (ppm) 391 30 371 411 4-Acid Digestion
Zr, Zirconium (ppm) 256 25 238 273 4-Acid Digestion
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