OREAS 460

OREAS 460 is an ore grade, rare earth element (TREO = 0.53%) matrix-matched certified reference material (MMCRM) prepared and certified by Ore Research & Exploration. The materials constituting OREAS 460 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 460 is one of six MMCRMs ranging TREO 0.53 – 9.88% and contains 110 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) 2209 89 2155 2263 Borate / Peroxide Fusion ICP
La2O3, Lanthanum(III) oxide (ppm) 1606 88 1556 1656 Borate / Peroxide Fusion ICP
Nd2O3, Neodymium(III) oxide (ppm) 911 54 879 943 Borate / Peroxide Fusion ICP
CeO2, Cerium(IV) oxide (ppm) 2213 88 2161 2266 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 26.81 0.383 26.32 27.30 Borate Fusion XRF
La2O3, Lanthanum(III) oxide (ppm) 1626 62 1583 1669 Borate Fusion XRF
Nd2O3, Neodymium(III) oxide (ppm) 958 66 903 1013 Borate Fusion XRF
Pr6O11, Praseodymium(III,IV) oxide (ppm) 289 63 226 353 Borate Fusion XRF
LOI1000, Loss On Ignition @1000 °C (wt.%) 2.54 0.209 2.32 2.77 Thermogravimetry
Al2O3, Aluminium(III) oxide (wt.%) 12.73 0.255 12.57 12.88 Borate / Peroxide Fusion ICP
BaO, Barium oxide (ppm) 902 59 870 934 Borate / Peroxide Fusion ICP
Be, Beryllium (ppm) 2.48 0.42 2.10 2.86 Borate / Peroxide Fusion ICP
Bi, Bismuth (ppm) 1.48 0.33 1.21 1.76 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 0.975 0.034 0.952 0.998 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 9.44 1.48 7.78 11.09 Borate / Peroxide Fusion ICP
Cr2O3, Chromium(III) oxide (ppm) 575 30 555 594 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) 3.68 0.246 3.57 3.78 Borate / Peroxide Fusion ICP
Dy2O3, Dysprosium(III) oxide (ppm) 22.8 0.86 22.3 23.3 Borate / Peroxide Fusion ICP
Er2O3, Erbium(III) oxide (ppm) 6.88 0.400 6.67 7.08 Borate / Peroxide Fusion ICP
Eu2O3, Europium(III) oxide (ppm) 26.3 1.12 25.7 27.0 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 27.02 0.898 26.43 27.62 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 33.8 1.74 31.7 36.0 Borate / Peroxide Fusion ICP
Gd2O3, Gadolinium(III) oxide (ppm) 58 3.4 56 60 Borate / Peroxide Fusion ICP
HfO2, Hafnium dioxide (ppm) 13.9 0.66 13.6 14.3 Borate / Peroxide Fusion ICP
Ho2O3, Holmium(III) oxide (ppm) 3.18 0.251 3.03 3.32 Borate / Peroxide Fusion ICP
K2O, Potassium oxide (wt.%) 1.48 0.103 1.41 1.55 Borate / Peroxide Fusion ICP
Li, Lithium (ppm) 19.6 0.85 19.0 20.1 Borate / Peroxide Fusion ICP
Lu2O3, Lutetium(III) oxide (ppm) 0.59 0.055 0.56 0.62 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 1.25 0.055 1.21 1.28 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (ppm) 466 39 432 500 Borate / Peroxide Fusion ICP
Mo, Molybdenum (ppm) 25.2 3.7 21.9 28.4 Borate / Peroxide Fusion ICP
Nb2O5, Niobium(V) oxide (ppm) 998 56 962 1034 Borate / Peroxide Fusion ICP
NiO, Nickel oxide (ppm) 68 6.3 65 71 Borate / Peroxide Fusion ICP
P2O5, Phosphorus(V) oxide (wt.%) 0.455 0.033 0.435 0.474 Borate / Peroxide Fusion ICP
PbO, Lead oxide (ppm) 72 5.8 69 75 Borate / Peroxide Fusion ICP
Pr6O11, Praseodymium(III,IV) oxide (ppm) 294 10 288 301 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 75 4.1 73 78 Borate / Peroxide Fusion ICP
Sb, Antimony (ppm) 3.71 0.39 3.20 4.22 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 49.80 0.624 49.37 50.24 Borate / Peroxide Fusion ICP
Sm2O3, Samarium(III) oxide (ppm) 125 4 122 127 Borate / Peroxide Fusion ICP
SnO2, Tin dioxide (ppm) 20.4 2.7 18.7 22.1 Borate / Peroxide Fusion ICP
SrO, Strontium oxide (ppm) 360 14 353 368 Borate / Peroxide Fusion ICP
Ta2O5, Tantalum(V) oxide (ppm) 16.8 0.78 16.3 17.2 Borate / Peroxide Fusion ICP
Tb4O7, Terbium(III,IV) oxide (ppm) 5.70 0.250 5.56 5.83 Borate / Peroxide Fusion ICP
ThO2, Thorium dioxide (ppm) 132 4 130 134 Borate / Peroxide Fusion ICP
TiO2, Titanium dioxide (wt.%) 2.00 0.046 1.97 2.03 Borate / Peroxide Fusion ICP
Tm2O3, Thulium(III) oxide (ppm) 0.80 0.062 0.77 0.83 Borate / Peroxide Fusion ICP
U3O8, Uranium(V,VI) oxide (ppm) 4.97 0.227 4.85 5.09 Borate / Peroxide Fusion ICP
V2O5, Vanadium(V) oxide (ppm) 456 22 442 469 Borate / Peroxide Fusion ICP
WO3, Tungsten trioxide (ppm) < 8.00 IND IND IND Borate / Peroxide Fusion ICP
Y2O3, Yttrium(III) oxide (ppm) 76 3.3 74 78 Borate / Peroxide Fusion ICP
Yb2O3, Ytterbium(III) oxide (ppm) 4.45 0.299 4.28 4.61 Borate / Peroxide Fusion ICP
ZnO, Zinc oxide (ppm) 150 29 116 184 Borate / Peroxide Fusion ICP
ZrO2, Zirconium dioxide (ppm) 638 29 619 658 Borate / Peroxide Fusion ICP
Ag, Silver (ppm) < 1.00 IND IND IND 4-Acid Digestion
Al, Aluminium (wt.%) 6.55 0.230 6.42 6.69 4-Acid Digestion
As, Arsenic (ppm) 53 3.4 51 56 4-Acid Digestion
Ba, Barium (ppm) 815 23 800 829 4-Acid Digestion
Be, Beryllium (ppm) 2.40 0.109 2.35 2.45 4-Acid Digestion
Bi, Bismuth (ppm) 1.44 0.077 1.40 1.49 4-Acid Digestion
Ca, Calcium (wt.%) 0.701 0.035 0.681 0.721 4-Acid Digestion
Cd, Cadmium (ppm) < 0.10 IND IND IND 4-Acid Digestion
Ce, Cerium (ppm) 1853 133 1738 1969 4-Acid Digestion
Co, Cobalt (ppm) 10.0 0.55 9.7 10.4 4-Acid Digestion
Cr, Chromium (ppm) 347 28 327 367 4-Acid Digestion
Cs, Caesium (ppm) 3.78 0.273 3.62 3.94 4-Acid Digestion
Cu, Copper (ppm) 41.7 2.00 40.5 43.0 4-Acid Digestion
Dy, Dysprosium (ppm) 18.0 0.44 17.8 18.3 4-Acid Digestion
Er, Erbium (ppm) 4.65 0.216 4.51 4.80 4-Acid Digestion
Eu, Europium (ppm) 23.1 1.31 22.2 24.0 4-Acid Digestion
Fe, Iron (wt.%) 18.56 0.431 18.30 18.83 4-Acid Digestion
Ga, Gallium (ppm) 33.0 4.3 28.9 37.2 4-Acid Digestion
Gd, Gadolinium (ppm) 48.2 2.46 46.4 49.9 4-Acid Digestion
Hf, Hafnium (ppm) 6.09 0.580 5.67 6.50 4-Acid Digestion
Ho, Holmium (ppm) 2.37 0.133 2.28 2.45 4-Acid Digestion
In, Indium (ppm) 0.31 0.017 0.30 0.32 4-Acid Digestion
K, Potassium (wt.%) 1.25 0.035 1.22 1.27 4-Acid Digestion
La, Lanthanum (ppm) 1298 113 1228 1368 4-Acid Digestion
Li, Lithium (ppm) 18.3 1.48 17.5 19.2 4-Acid Digestion
Lu, Lutetium (ppm) 0.36 0.05 0.33 0.38 4-Acid Digestion
Mg, Magnesium (wt.%) 0.724 0.058 0.690 0.759 4-Acid Digestion
Mn, Manganese (ppm) 307 29 288 326 4-Acid Digestion
Mo, Molybdenum (ppm) 25.4 0.73 25.0 25.8 4-Acid Digestion
Na, Sodium (wt.%) 0.133 0.006 0.130 0.137 4-Acid Digestion
Nd, Neodymium (ppm) 792 27 775 809 4-Acid Digestion
Ni, Nickel (ppm) 62 4.0 59 64 4-Acid Digestion
P, Phosphorus (wt.%) 0.193 0.009 0.187 0.198 4-Acid Digestion
Pb, Lead (ppm) 65 2.4 63 67 4-Acid Digestion
Pr, Praseodymium (ppm) 240 11 233 246 4-Acid Digestion
Rb, Rubidium (ppm) 76 5.2 73 79 4-Acid Digestion
Re, Rhenium (ppm) < 0.004 IND IND IND 4-Acid Digestion
S, Sulphur (ppm) 291 41 267 316 4-Acid Digestion
Sb, Antimony (ppm) 3.40 0.289 3.21 3.59 4-Acid Digestion
Sc, Scandium (ppm) 27.9 1.26 27.1 28.6 4-Acid Digestion
Se, Selenium (ppm) < 5.00 IND IND IND 4-Acid Digestion
Sm, Samarium (ppm) 101 5 98 104 4-Acid Digestion
Sn, Tin (ppm) 13.3 1.13 12.5 14.0 4-Acid Digestion
Sr, Strontium (ppm) 306 15 296 315 4-Acid Digestion
Ta, Tantalum (ppm) 11.5 1.6 10.1 12.8 4-Acid Digestion
Tb, Terbium (ppm) 4.60 0.172 4.50 4.71 4-Acid Digestion
Te, Tellurium (ppm) 0.21 0.04 0.18 0.24 4-Acid Digestion
Th, Thorium (ppm) 113 5 110 117 4-Acid Digestion
Ti, Titanium (wt.%) 0.731 0.140 0.640 0.821 4-Acid Digestion
Tl, Thallium (ppm) 0.38 0.029 0.36 0.39 4-Acid Digestion
Tm, Thulium (ppm) 0.50 0.048 0.47 0.53 4-Acid Digestion
U, Uranium (ppm) 3.85 0.166 3.76 3.95 4-Acid Digestion
V, Vanadium (ppm) 238 14 229 247 4-Acid Digestion
W, Tungsten (ppm) 3.14 0.287 2.92 3.36 4-Acid Digestion
Y, Yttrium (ppm) 49.3 2.59 47.8 50.8 4-Acid Digestion
Yb, Ytterbium (ppm) 2.64 0.189 2.54 2.75 4-Acid Digestion
Zn, Zinc (ppm) 117 7 113 121 4-Acid Digestion
Zr, Zirconium (ppm) 218 25 201 234 4-Acid Digestion
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