OREAS 462

OREAS 462 is an ore grade, rare earth element (TREO = 1.54%) matrix-matched certified reference material (MMCRM) prepared and certified by Ore Research & Exploration. The materials constituting OREAS 462 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 462 is one of six MMCRMs ranging TREO 0.53 – 9.88% and contains 111 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 Limits Low 95% Confidence Limits High Method
CeO2, Cerium(IV) oxide (ppm) 6082 256 5955 6209 Borate / Peroxide Fusion ICP
La2O3, Lanthanum(III) oxide (ppm) 4450 86 4416 4484 Borate / Peroxide Fusion ICP
Nd2O3, Neodymium(III) oxide (ppm) 2985 149 2901 3070 Borate / Peroxide Fusion ICP
CeO2, Cerium(IV) oxide (ppm) 6182 151 6054 6309 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 48.69 0.752 47.67 49.72 Borate Fusion XRF
La2O3, Lanthanum(III) oxide (ppm) 4517 92 4443 4592 Borate Fusion XRF
Nd2O3, Neodymium(III) oxide (ppm) 3048 75 2979 3116 Borate Fusion XRF
Pr6O11, Praseodymium(III,IV) oxide (ppm) 845 119 714 976 Borate Fusion XRF
Sm2O3, Samarium(III) oxide (ppm) < 500 IND IND IND Borate Fusion XRF
LOI1000, Loss On Ignition @1000 °C (wt.%) 0.771 0.120 0.610 0.932 Thermogravimetry
Al2O3, Aluminium(III) oxide (wt.%) 10.95 0.369 10.68 11.21 Borate / Peroxide Fusion ICP
BaO, Barium oxide (ppm) 1144 58 1112 1176 Borate / Peroxide Fusion ICP
Be, Beryllium (ppm) 3.76 0.327 3.61 3.90 Borate / Peroxide Fusion ICP
Bi, Bismuth (ppm) 2.58 0.42 2.13 3.04 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 1.79 0.090 1.73 1.85 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 12.5 2.0 10.4 14.5 Borate / Peroxide Fusion ICP
Cr2O3, Chromium(III) oxide (ppm) 890 45 864 916 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) 0.44 0.07 0.39 0.48 Borate / Peroxide Fusion ICP
Dy2O3, Dysprosium(III) oxide (ppm) 59 2.6 57 60 Borate / Peroxide Fusion ICP
Er2O3, Erbium(III) oxide (ppm) 14.0 0.64 13.6 14.3 Borate / Peroxide Fusion ICP
Eu2O3, Europium(III) oxide (ppm) 91 3.3 89 93 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 48.38 2.017 46.93 49.82 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 52 9 43 62 Borate / Peroxide Fusion ICP
Gd2O3, Gadolinium(III) oxide (ppm) 190 8 186 195 Borate / Peroxide Fusion ICP
HfO2, Hafnium dioxide (ppm) 16.5 0.92 16.1 16.8 Borate / Peroxide Fusion ICP
Ho2O3, Holmium(III) oxide (ppm) 7.44 0.527 7.15 7.73 Borate / Peroxide Fusion ICP
K2O, Potassium oxide (wt.%) 0.145 0.021 0.128 0.162 Borate / Peroxide Fusion ICP
Li, Lithium (ppm) 11.3 0.84 10.3 12.3 Borate / Peroxide Fusion ICP
Lu2O3, Lutetium(III) oxide (ppm) 0.72 0.049 0.69 0.74 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 1.80 0.053 1.76 1.84 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (ppm) 1204 87 1137 1271 Borate / Peroxide Fusion ICP
Mo, Molybdenum (ppm) 51 3.3 49 54 Borate / Peroxide Fusion ICP
Nb2O5, Niobium(V) oxide (ppm) 2070 56 2033 2107 Borate / Peroxide Fusion ICP
NiO, Nickel oxide (ppm) 85 11 75 94 Borate / Peroxide Fusion ICP
P2O5, Phosphorus(V) oxide (wt.%) 1.13 0.024 1.11 1.14 Borate / Peroxide Fusion ICP
PbO, Lead oxide (ppm) 123 6 118 129 Borate / Peroxide Fusion ICP
Pr6O11, Praseodymium(III,IV) oxide (ppm) 888 41 868 909 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 6.58 0.377 6.40 6.75 Borate / Peroxide Fusion ICP
S, Sulphur (ppm) 587 89 523 651 Borate / Peroxide Fusion ICP
Sb, Antimony (ppm) 2.57 0.38 2.29 2.85 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 28.19 0.532 27.74 28.63 Borate / Peroxide Fusion ICP
Sm2O3, Samarium(III) oxide (ppm) 428 10 423 432 Borate / Peroxide Fusion ICP
SnO2, Tin dioxide (ppm) 37.1 4.2 34.6 39.6 Borate / Peroxide Fusion ICP
SrO, Strontium oxide (ppm) 904 26 892 916 Borate / Peroxide Fusion ICP
Ta2O5, Tantalum(V) oxide (ppm) 31.3 2.02 30.1 32.6 Borate / Peroxide Fusion ICP
Tb4O7, Terbium(III,IV) oxide (ppm) 16.9 0.63 16.6 17.2 Borate / Peroxide Fusion ICP
ThO2, Thorium dioxide (ppm) 283 10 278 289 Borate / Peroxide Fusion ICP
TiO2, Titanium dioxide (wt.%) 3.18 0.123 3.10 3.26 Borate / Peroxide Fusion ICP
Tm2O3, Thulium(III) oxide (ppm) 1.37 0.118 1.32 1.43 Borate / Peroxide Fusion ICP
U3O8, Uranium(V,VI) oxide (ppm) 7.25 0.314 7.11 7.39 Borate / Peroxide Fusion ICP
V2O5, Vanadium(V) oxide (ppm) 679 32 664 694 Borate / Peroxide Fusion ICP
WO3, Tungsten trioxide (ppm) 4.53 0.84 3.85 5.21 Borate / Peroxide Fusion ICP
Y2O3, Yttrium(III) oxide (ppm) 168 8 164 173 Borate / Peroxide Fusion ICP
Yb2O3, Ytterbium(III) oxide (ppm) 6.28 0.411 6.08 6.47 Borate / Peroxide Fusion ICP
ZnO, Zinc oxide (ppm) 335 32 291 379 Borate / Peroxide Fusion ICP
ZrO2, Zirconium dioxide (ppm) 801 36 779 823 Borate / Peroxide Fusion ICP
Ag, Silver (ppm) < 2.00 IND IND IND 4-Acid Digestion
Al, Aluminium (wt.%) 5.71 0.132 5.63 5.79 4-Acid Digestion
As, Arsenic (ppm) 30.8 1.28 29.9 31.7 4-Acid Digestion
Ba, Barium (ppm) 1037 38 1014 1059 4-Acid Digestion
Be, Beryllium (ppm) 3.57 0.324 3.36 3.77 4-Acid Digestion
Bi, Bismuth (ppm) 2.69 0.173 2.59 2.79 4-Acid Digestion
Ca, Calcium (wt.%) 1.25 0.087 1.19 1.30 4-Acid Digestion
Cd, Cadmium (ppm) < 0.20 IND IND IND 4-Acid Digestion
Ce, Cerium (ppm) 4984 180 4827 5142 4-Acid Digestion
Co, Cobalt (ppm) 13.0 0.87 12.5 13.6 4-Acid Digestion
Cr, Chromium (ppm) 502 82 445 558 4-Acid Digestion
Cs, Caesium (ppm) 0.45 0.06 0.41 0.49 4-Acid Digestion
Cu, Copper (ppm) 61 1.9 60 62 4-Acid Digestion
Dy, Dysprosium (ppm) 51 1.2 50 51 4-Acid Digestion
Er, Erbium (ppm) 10.8 0.42 10.6 11.1 4-Acid Digestion
Eu, Europium (ppm) 80 4.4 77 83 4-Acid Digestion
Fe, Iron (wt.%) 33.05 0.992 32.43 33.68 4-Acid Digestion
Ga, Gallium (ppm) 58 7 49 68 4-Acid Digestion
Gd, Gadolinium (ppm) 164 6 161 167 4-Acid Digestion
Hf, Hafnium (ppm) 7.40 0.83 6.79 8.01 4-Acid Digestion
Ho, Holmium (ppm) 6.18 0.323 5.98 6.38 4-Acid Digestion
In, Indium (ppm) 0.75 0.039 0.73 0.77 4-Acid Digestion
K, Potassium (wt.%) 0.118 0.005 0.115 0.122 4-Acid Digestion
La, Lanthanum (ppm) 3669 193 3516 3822 4-Acid Digestion
Li, Lithium (ppm) 10.8 1.4 10.1 11.6 4-Acid Digestion
Lu, Lutetium (ppm) 0.53 0.10 0.47 0.59 4-Acid Digestion
Mg, Magnesium (wt.%) 1.01 0.12 0.93 1.08 4-Acid Digestion
Mn, Manganese (ppm) 840 63 790 890 4-Acid Digestion
Mo, Molybdenum (ppm) 53 3.5 51 56 4-Acid Digestion
Na, Sodium (wt.%) 0.178 0.012 0.171 0.185 4-Acid Digestion
Nd, Neodymium (ppm) 2595 126 2523 2668 4-Acid Digestion
Ni, Nickel (ppm) 74 3.1 72 76 4-Acid Digestion
P, Phosphorus (wt.%) 0.454 0.049 0.423 0.485 4-Acid Digestion
Pb, Lead (ppm) 119 5 115 122 4-Acid Digestion
Pr, Praseodymium (ppm) 736 30 720 752 4-Acid Digestion
Rb, Rubidium (ppm) 6.45 0.601 6.12 6.78 4-Acid Digestion
Re, Rhenium (ppm) < 0.010 IND IND IND 4-Acid Digestion
S, Sulphur (ppm) 548 70 504 592 4-Acid Digestion
Sb, Antimony (ppm) 2.17 0.25 2.01 2.34 4-Acid Digestion
Sc, Scandium (ppm) 51 3.7 49 54 4-Acid Digestion
Sm, Samarium (ppm) 362 17 352 372 4-Acid Digestion
Sn, Tin (ppm) 23.9 1.37 22.9 24.9 4-Acid Digestion
Sr, Strontium (ppm) 738 59 701 774 4-Acid Digestion
Ta, Tantalum (ppm) 21.8 2.4 19.7 23.9 4-Acid Digestion
Tb, Terbium (ppm) 14.7 0.62 14.3 15.1 4-Acid Digestion
Te, Tellurium (ppm) 0.33 0.06 0.28 0.39 4-Acid Digestion
Th, Thorium (ppm) 246 8 241 250 4-Acid Digestion
Ti, Titanium (wt.%) 0.986 0.104 0.908 1.064 4-Acid Digestion
Tl, Thallium (ppm) 0.083 0.010 0.076 0.090 4-Acid Digestion
Tm, Thulium (ppm) 1.01 0.090 0.96 1.06 4-Acid Digestion
U, Uranium (ppm) 5.79 0.364 5.60 5.99 4-Acid Digestion
V, Vanadium (ppm) 353 26 334 372 4-Acid Digestion
W, Tungsten (ppm) 2.31 0.33 2.07 2.54 4-Acid Digestion
Y, Yttrium (ppm) 125 5 122 128 4-Acid Digestion
Yb, Ytterbium (ppm) 4.36 0.352 4.14 4.59 4-Acid Digestion
Zn, Zinc (ppm) 244 25 227 261 4-Acid Digestion
Zr, Zirconium (ppm) 270 31 249 291 4-Acid Digestion
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