OREAS 461

OREAS 461 is an ore grade, rare earth element (TREO = 1.06%) matrix-matched certified reference material (MMCRM) prepared and certified by Ore Research & Exploration. The materials constituting OREAS 461 were sourced from both a quarry north of Melbourne (weathered barren siltstone) and 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 461 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 (ppm) 4311 162 4222 4401 Borate / Peroxide Fusion ICP
La2O3, Lanthanum(III) oxide (ppm) 3155 185 3051 3259 Borate / Peroxide Fusion ICP
Nd2O3, Neodymium(III) oxide (ppm) 1900 63 1863 1937 Borate / Peroxide Fusion ICP
CeO2, Cerium(IV) oxide (ppm) 4376 55 4331 4421 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 46.09 0.773 45.06 47.12 Borate Fusion XRF
La2O3, Lanthanum(III) oxide (ppm) 3191 64 3149 3232 Borate Fusion XRF
Nd2O3, Neodymium(III) oxide (ppm) 1928 133 1801 2055 Borate Fusion XRF
Pr6O11, Praseodymium(III,IV) oxide (ppm) 585 103 484 686 Borate Fusion XRF
ThO2, Thorium dioxide (ppm) 265 52 194 335 Borate Fusion XRF
LOI1000, Loss On Ignition @1000°C (wt.%) 0.996 0.175 0.801 1.192 Thermogravimetry
Al2O3, Aluminium(III) oxide (wt.%) 11.31 0.393 11.03 11.59 Borate / Peroxide Fusion ICP
BaO, Barium oxide (ppm) 1037 62 1003 1071 Borate / Peroxide Fusion ICP
Be, Beryllium (ppm) 2.30 0.38 1.91 2.69 Borate / Peroxide Fusion ICP
Bi, Bismuth (ppm) 2.49 0.39 2.09 2.88 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 1.76 0.080 1.71 1.81 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 11.5 1.8 9.7 13.4 Borate / Peroxide Fusion ICP
Cr2O3, Chromium(III) oxide (ppm) 875 59 840 911 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) 0.79 0.059 0.75 0.82 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 60 20 41 80 Borate / Peroxide Fusion ICP
Dy2O3, Dysprosium(III) oxide (ppm) 40.0 1.66 39.1 40.9 Borate / Peroxide Fusion ICP
Er2O3, Erbium(III) oxide (ppm) 10.1 0.34 9.9 10.3 Borate / Peroxide Fusion ICP
Eu2O3, Europium(III) oxide (ppm) 54 2.5 53 56 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 45.43 1.860 44.06 46.79 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 50 6 43 57 Borate / Peroxide Fusion ICP
Gd2O3, Gadolinium(III) oxide (ppm) 116 9 110 121 Borate / Peroxide Fusion ICP
HfO2, Hafnium dioxide (ppm) 16.6 0.72 16.2 17.1 Borate / Peroxide Fusion ICP
Ho2O3, Holmium(III) oxide (ppm) 5.22 0.350 5.02 5.43 Borate / Peroxide Fusion ICP
In, Indium (ppm) 0.60 0.08 0.52 0.68 Borate / Peroxide Fusion ICP
K2O, Potassium oxide (wt.%) 0.285 0.040 0.256 0.314 Borate / Peroxide Fusion ICP
Li, Lithium (ppm) 12.0 1.5 10.3 13.7 Borate / Peroxide Fusion ICP
Lu2O3, Lutetium(III) oxide (ppm) 0.59 0.050 0.56 0.62 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 1.74 0.085 1.68 1.79 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (ppm) 843 63 795 890 Borate / Peroxide Fusion ICP
Mo, Molybdenum (ppm) 45.7 4.8 41.1 50.3 Borate / Peroxide Fusion ICP
Nb2O5, Niobium(V) oxide (ppm) 1854 140 1762 1947 Borate / Peroxide Fusion ICP
NiO, Nickel oxide (ppm) 81 7.0 78 85 Borate / Peroxide Fusion ICP
P2O5, Phosphorus(V) oxide (wt.%) 0.822 0.044 0.789 0.855 Borate / Peroxide Fusion ICP
PbO, Lead oxide (ppm) 114 7 108 121 Borate / Peroxide Fusion ICP
Pr6O11, Praseodymium(III,IV) oxide (ppm) 590 25 577 604 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 13.5 0.54 13.2 13.8 Borate / Peroxide Fusion ICP
S, Sulphur (ppm) 518 82 433 602 Borate / Peroxide Fusion ICP
Sb, Antimony (ppm) 2.76 0.220 2.53 2.99 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 31.46 0.770 30.80 32.13 Borate / Peroxide Fusion ICP
Sm2O3, Samarium(III) oxide (ppm) 255 9 251 259 Borate / Peroxide Fusion ICP
SnO2, Tin dioxide (ppm) 32.5 4.2 29.7 35.4 Borate / Peroxide Fusion ICP
SrO, Strontium oxide (ppm) 685 18 674 695 Borate / Peroxide Fusion ICP
Ta2O5, Tantalum(V) oxide (ppm) 30.7 1.27 30.0 31.4 Borate / Peroxide Fusion ICP
Tb4O7, Terbium(III,IV) oxide (ppm) 10.7 0.36 10.5 10.9 Borate / Peroxide Fusion ICP
ThO2, Thorium dioxide (ppm) 239 8 234 244 Borate / Peroxide Fusion ICP
TiO2, Titanium dioxide (wt.%) 3.07 0.092 3.01 3.13 Borate / Peroxide Fusion ICP
Tm2O3, Thulium(III) oxide (ppm) 1.02 0.098 0.96 1.07 Borate / Peroxide Fusion ICP
U3O8, Uranium(V,VI) oxide (ppm) 5.65 0.230 5.53 5.77 Borate / Peroxide Fusion ICP
V2O5, Vanadium(V) oxide (ppm) 687 29 671 702 Borate / Peroxide Fusion ICP
WO3, Tungsten trioxide (ppm) 4.89 0.84 4.23 5.55 Borate / Peroxide Fusion ICP
Y2O3, Yttrium(III) oxide (ppm) 116 6 112 119 Borate / Peroxide Fusion ICP
Yb2O3, Ytterbium(III) oxide (ppm) 5.00 0.282 4.86 5.15 Borate / Peroxide Fusion ICP
ZnO, Zinc oxide (ppm) 201 29 163 240 Borate / Peroxide Fusion ICP
ZrO2, Zirconium dioxide (ppm) 815 36 790 839 Borate / Peroxide Fusion ICP
Ag, Silver (ppm) < 2.00 IND IND IND 4-Acid Digestion
Al, Aluminium (wt.%) 5.96 0.180 5.86 6.06 4-Acid Digestion
As, Arsenic (ppm) 33.6 1.09 33.0 34.1 4-Acid Digestion
Ba, Barium (ppm) 957 44 931 983 4-Acid Digestion
Be, Beryllium (ppm) 2.09 0.24 1.96 2.22 4-Acid Digestion
Bi, Bismuth (ppm) 2.43 0.158 2.33 2.52 4-Acid Digestion
Ca, Calcium (wt.%) 1.21 0.090 1.16 1.27 4-Acid Digestion
Cd, Cadmium (ppm) < 0.10 IND IND IND 4-Acid Digestion
Ce, Cerium (ppm) 3508 112 3420 3597 4-Acid Digestion
Co, Cobalt (ppm) 12.1 0.44 11.8 12.4 4-Acid Digestion
Cr, Chromium (ppm) 524 73 473 575 4-Acid Digestion
Cs, Caesium (ppm) 0.77 0.067 0.73 0.81 4-Acid Digestion
Cu, Copper (ppm) 56 2.3 55 57 4-Acid Digestion
Dy, Dysprosium (ppm) 33.5 0.86 33.1 33.9 4-Acid Digestion
Er, Erbium (ppm) 7.46 0.253 7.31 7.61 4-Acid Digestion
Eu, Europium (ppm) 47.6 3.26 45.7 49.6 4-Acid Digestion
Fe, Iron (wt.%) 31.52 0.959 30.95 32.09 4-Acid Digestion
Ga, Gallium (ppm) 45.5 8.0 37.7 53.3 4-Acid Digestion
Gd, Gadolinium (ppm) 98 3.5 95 100 4-Acid Digestion
Hf, Hafnium (ppm) 7.39 0.84 6.78 8.00 4-Acid Digestion
Ho, Holmium (ppm) 4.06 0.115 3.99 4.12 4-Acid Digestion
In, Indium (ppm) 0.57 0.027 0.55 0.58 4-Acid Digestion
K, Potassium (wt.%) 0.233 0.006 0.231 0.235 4-Acid Digestion
La, Lanthanum (ppm) 2476 228 2338 2615 4-Acid Digestion
Li, Lithium (ppm) 12.0 1.4 11.3 12.8 4-Acid Digestion
Lu, Lutetium (ppm) 0.39 0.07 0.35 0.43 4-Acid Digestion
Mg, Magnesium (wt.%) 0.999 0.108 0.935 1.063 4-Acid Digestion
Mn, Manganese (ppm) 547 80 496 599 4-Acid Digestion
Mo, Molybdenum (ppm) 48.2 2.54 46.6 49.9 4-Acid Digestion
Na, Sodium (wt.%) 0.178 0.013 0.170 0.186 4-Acid Digestion
Nd, Neodymium (ppm) 1623 80 1579 1668 4-Acid Digestion
Ni, Nickel (ppm) 71 3.1 69 73 4-Acid Digestion
P, Phosphorus (wt.%) 0.338 0.022 0.324 0.352 4-Acid Digestion
Pb, Lead (ppm) 104 5 100 108 4-Acid Digestion
Pr, Praseodymium (ppm) 482 20 471 493 4-Acid Digestion
Rb, Rubidium (ppm) 13.3 0.99 12.8 13.8 4-Acid Digestion
Re, Rhenium (ppm) < 0.010 IND IND IND 4-Acid Digestion
S, Sulphur (ppm) 475 49 446 504 4-Acid Digestion
Sb, Antimony (ppm) 2.42 0.174 2.30 2.53 4-Acid Digestion
Sc, Scandium (ppm) 38.8 2.50 37.3 40.4 4-Acid Digestion
Sm, Samarium (ppm) 208 7 204 212 4-Acid Digestion
Sn, Tin (ppm) 21.6 2.08 20.2 23.1 4-Acid Digestion
Sr, Strontium (ppm) 564 35 543 586 4-Acid Digestion
Ta, Tantalum (ppm) 20.9 1.96 19.2 22.6 4-Acid Digestion
Tb, Terbium (ppm) 9.09 0.503 8.76 9.43 4-Acid Digestion
Te, Tellurium (ppm) 0.34 0.06 0.30 0.38 4-Acid Digestion
Th, Thorium (ppm) 207 10 201 212 4-Acid Digestion
Ti, Titanium (wt.%) 1.06 0.117 0.96 1.15 4-Acid Digestion
Tl, Thallium (ppm) 0.10 0.008 0.10 0.11 4-Acid Digestion
Tm, Thulium (ppm) 0.70 0.046 0.67 0.73 4-Acid Digestion
U, Uranium (ppm) 4.40 0.161 4.31 4.49 4-Acid Digestion
V, Vanadium (ppm) 352 29 333 371 4-Acid Digestion
W, Tungsten (ppm) 2.50 0.36 2.25 2.74 4-Acid Digestion
Y, Yttrium (ppm) 83 3.7 81 85 4-Acid Digestion
Yb, Ytterbium (ppm) 3.06 0.149 2.98 3.15 4-Acid Digestion
Zn, Zinc (ppm) 139 13 131 148 4-Acid Digestion
Zr, Zirconium (ppm) 270 18 257 283 4-Acid Digestion
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