OREAS 465b

OREAS 465b is an ore grade, rare earth element (TREO + Y₂O₃ ~8.84%) certified reference material (CRM) prepared from a blend of rare earth element (REE)–bearing waste rock sourced from Lynas Corporation’s Mount Weld Central Lanthanide Deposit and barren siliclastic sedimentary rock sourced from Victoria, Australia. The Mount Weld deposit is a Proterozoic, carbonatite-hosted, deeply weathered monazite-rich REE deposit located ~35 km south of Laverton in Western Australia. The REE-bearing ores are predominantly comprised of secondary REE phosphates such as monazite and other alteration products formed through intense tropical weathering.

OREAS 465b belongs to a CRM suite covering 0.11 – 9.88% TREO + Y₂O₃, with method-specific certification for REEs, major elements, and trace elements using fusion with XRF, fusion with ICP-OES and/or ICP-MS, and 4-acid digestion with ICP-OES and/or ICP-MS.

Twenty-five commercial analytical laboratories participated in the program to certify the elements reported below:

  • 4-acid (HNO3-HF-HClO4-HCl) digestion with full suite ICP-OES and ICP-MS elemental packages
  • Sodium peroxide/borate fusion with full suite ICP-OES and ICP-MS elemental packages
  • Lithium borate fusion whole rock analysis package with X-ray fluorescence
  • Thermogravimetry: Loss on Ignition (LOI) at 1000 °C

Homogeneity was evaluated using 12 subsamples analysed by sodium peroxide fusion with ICP finish. ANOVA was applied to triplicates from four test units to compare within- and between-unit variances, providing a statistical measure of batch homogeneity.

Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
CeO2, Cerium(IV) oxide (wt.%) 4.37 0.173 4.22 4.52 Borate / Peroxide Fusion ICP
La2O3, Lanthanum(III) oxide (wt.%) 2.46 0.067 2.39 2.53 Borate / Peroxide Fusion ICP
Nd2O3, Neodymium(III) oxide (wt.%) 1.27 0.068 1.22 1.32 Borate / Peroxide Fusion ICP
Pr6O11, Praseodymium(III,IV) oxide (wt.%) 0.409 0.021 0.393 0.426 Borate / Peroxide Fusion ICP
Ag, Silver (ppm) 6.09 0.467 5.56 6.61 4-Acid Digestion
Al, Aluminium (wt.%) 5.53 0.386 5.26 5.79 4-Acid Digestion
Ba, Barium (wt.%) 0.344 0.029 0.318 0.370 4-Acid Digestion
Be, Beryllium (ppm) 12.3 1.4 11.4 13.2 4-Acid Digestion
Bi, Bismuth (ppm) 14.7 0.90 13.8 15.6 4-Acid Digestion
Ca, Calcium (wt.%) 0.643 0.061 0.597 0.688 4-Acid Digestion
Cd, Cadmium (ppm) 0.87 0.23 0.70 1.03 4-Acid Digestion
Ce, Cerium (wt.%) 3.47 0.58 3.06 3.88 4-Acid Digestion
Co, Cobalt (ppm) 17.2 1.23 16.3 18.2 4-Acid Digestion
Cr, Chromium (ppm) 288 43 262 314 4-Acid Digestion
Cs, Caesium (ppm) < 0.050 IND IND IND 4-Acid Digestion
Cu, Copper (ppm) 114 6 108 121 4-Acid Digestion
Dy, Dysprosium (ppm) 196 73 146 245 4-Acid Digestion
Er, Erbium (ppm) 38.0 10.1 30.0 45.9 4-Acid Digestion
Fe, Iron (wt.%) 29.18 0.998 28.13 30.22 4-Acid Digestion
Ga, Gallium (ppm) 51 10 41 61 4-Acid Digestion
Gd, Gadolinium (ppm) 500 201 338 662 4-Acid Digestion
Ho, Holmium (ppm) 22.6 3.2 19.6 25.7 4-Acid Digestion
In, Indium (ppm) 3.00 0.092 2.88 3.12 4-Acid Digestion
K, Potassium (wt.%) 0.012 0.004 0.010 0.014 4-Acid Digestion
La, Lanthanum (wt.%) 1.78 0.48 1.42 2.14 4-Acid Digestion
Li, Lithium (ppm) 3.13 0.51 2.67 3.60 4-Acid Digestion
Mg, Magnesium (wt.%) 0.276 0.027 0.257 0.295 4-Acid Digestion
Mn, Manganese (wt.%) 0.214 0.015 0.200 0.227 4-Acid Digestion
Mo, Molybdenum (ppm) 96 9.0 89 102 4-Acid Digestion
Na, Sodium (wt.%) 0.060 0.012 0.048 0.071 4-Acid Digestion
Nb, Niobium (wt.%) 0.352 0.086 0.287 0.416 4-Acid Digestion
Nd, Neodymium (wt.%) 1.08 0.14 0.95 1.20 4-Acid Digestion
Ni, Nickel (ppm) 45.8 3.95 42.8 48.7 4-Acid Digestion
P, Phosphorus (wt.%) 2.63 0.40 2.31 2.96 4-Acid Digestion
Pb, Lead (ppm) 462 30 432 491 4-Acid Digestion
Pr, Praseodymium (wt.%) 0.342 0.056 0.273 0.411 4-Acid Digestion
Rb, Rubidium (ppm) 0.42 0.08 0.33 0.51 4-Acid Digestion
S, Sulphur (wt.%) 0.151 0.032 0.128 0.174 4-Acid Digestion
Sb, Antimony (ppm) 0.84 0.25 0.59 1.09 4-Acid Digestion
Sc, Scandium (ppm) 120 50 93 146 4-Acid Digestion
Sm, Samarium (wt.%) 0.127 0.033 0.097 0.158 4-Acid Digestion
Sn, Tin (ppm) 69 27 52 85 4-Acid Digestion
Sr, Strontium (wt.%) 0.378 0.029 0.350 0.406 4-Acid Digestion
Te, Tellurium (ppm) 0.51 0.08 0.40 0.61 4-Acid Digestion
Ti, Titanium (wt.%) 3.29 0.88 2.73 3.85 4-Acid Digestion
Tl, Thallium (ppm) 0.094 0.006 0.085 0.103 4-Acid Digestion
Tm, Thulium (ppm) 3.18 0.90 2.52 3.83 4-Acid Digestion
U, Uranium (ppm) 12.4 0.70 11.9 13.0 4-Acid Digestion
V, Vanadium (ppm) 420 37 395 444 4-Acid Digestion
W, Tungsten (ppm) 3.89 0.63 3.35 4.43 4-Acid Digestion
Yb, Ytterbium (ppm) 14.5 5.4 10.6 18.4 4-Acid Digestion
Zn, Zinc (ppm) 950 52 915 985 4-Acid Digestion
Al, Aluminium (wt.%) 5.90 0.114 5.75 6.04 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 11.14 0.216 10.87 11.41 Borate / Peroxide Fusion ICP
Ba, Barium (wt.%) 0.386 0.016 0.371 0.402 Borate / Peroxide Fusion ICP
BaO, Barium oxide (wt.%) 0.432 0.017 0.414 0.449 Borate / Peroxide Fusion ICP
Be, Beryllium (ppm) 13.5 1.10 11.6 15.3 Borate / Peroxide Fusion ICP
Bi, Bismuth (ppm) 15.0 0.74 13.3 16.7 Borate / Peroxide Fusion ICP
Ca, Calcium (wt.%) 0.672 0.037 0.636 0.709 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 0.946 0.050 0.889 1.004 Borate / Peroxide Fusion ICP
Cd, Cadmium (ppm) < 10.0 IND IND IND Borate / Peroxide Fusion ICP
Ce, Cerium (wt.%) 3.56 0.141 3.44 3.68 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 19.4 1.22 17.5 21.2 Borate / Peroxide Fusion ICP
Cr, Chromium (ppm) 350 27 321 379 Borate / Peroxide Fusion ICP
Cr2O3, Chromium(III) oxide (ppm) 511 39 469 553 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) < 0.10 IND IND IND Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 142 24 117 167 Borate / Peroxide Fusion ICP
Dy, Dysprosium (ppm) 198 8 190 206 Borate / Peroxide Fusion ICP
Dy2O3, Dysprosium(III) oxide (ppm) 227 9 218 236 Borate / Peroxide Fusion ICP
Er, Erbium (ppm) 46.1 2.61 43.9 48.3 Borate / Peroxide Fusion ICP
Er2O3, Erbium(III) oxide (ppm) 53 3.0 50 55 Borate / Peroxide Fusion ICP
Eu, Europium (ppm) 265 13 255 276 Borate / Peroxide Fusion ICP
Eu2O3, Europium(III) oxide (ppm) 307 15 295 319 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 30.54 0.751 29.65 31.44 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 43.67 1.074 42.39 44.95 Borate / Peroxide Fusion ICP
Gd, Gadolinium (ppm) 557 35 528 585 Borate / Peroxide Fusion ICP
Gd2O3, Gadolinium(III) oxide (ppm) 641 41 610 673 Borate / Peroxide Fusion ICP
Ho, Holmium (ppm) 25.0 1.10 24.0 26.0 Borate / Peroxide Fusion ICP
Ho2O3, Holmium(III) oxide (ppm) 28.7 1.26 27.5 29.8 Borate / Peroxide Fusion ICP
In, Indium (ppm) 3.05 0.158 2.75 3.36 Borate / Peroxide Fusion ICP
La, Lanthanum (wt.%) 2.10 0.057 2.03 2.16 Borate / Peroxide Fusion ICP
Lu, Lutetium (ppm) 1.77 0.104 1.59 1.95 Borate / Peroxide Fusion ICP
Lu2O3, Lutetium(III) oxide (ppm) 2.01 0.114 1.82 2.21 Borate / Peroxide Fusion ICP
Mg, Magnesium (wt.%) 0.274 0.031 0.248 0.300 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 0.455 0.052 0.411 0.498 Borate / Peroxide Fusion ICP
Mn, Manganese (wt.%) 0.234 0.010 0.223 0.246 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (wt.%) 0.303 0.013 0.287 0.318 Borate / Peroxide Fusion ICP
Mo, Molybdenum (ppm) 97 6.8 87 108 Borate / Peroxide Fusion ICP
Nb, Niobium (wt.%) 0.423 0.023 0.405 0.441 Borate / Peroxide Fusion ICP
Nd, Neodymium (wt.%) 1.09 0.058 1.05 1.13 Borate / Peroxide Fusion ICP
Ni, Nickel (ppm) 52 9 35 69 Borate / Peroxide Fusion ICP
P, Phosphorus (wt.%) 3.21 0.201 2.92 3.51 Borate / Peroxide Fusion ICP
P2O5, Phosphorus(V) oxide (wt.%) 7.36 0.459 6.69 8.04 Borate / Peroxide Fusion ICP
Pb, Lead (ppm) 490 21 452 527 Borate / Peroxide Fusion ICP
Pr, Praseodymium (wt.%) 0.339 0.017 0.325 0.353 Borate / Peroxide Fusion ICP
S, Sulphur (wt.%) 0.171 0.011 0.145 0.198 Borate / Peroxide Fusion ICP
Sc, Scandium (ppm) 161 24 137 184 Borate / Peroxide Fusion ICP
Si, Silicon (wt.%) 1.48 0.063 1.37 1.59 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 3.17 0.135 2.93 3.40 Borate / Peroxide Fusion ICP
Sm, Samarium (wt.%) 0.122 0.008 0.116 0.129 Borate / Peroxide Fusion ICP
Sm2O3, Samarium(III) oxide (wt.%) 0.142 0.009 0.134 0.149 Borate / Peroxide Fusion ICP
Sn, Tin (ppm) 131 4 125 136 Borate / Peroxide Fusion ICP
Sr, Strontium (wt.%) 0.444 0.029 0.422 0.466 Borate / Peroxide Fusion ICP
Ta, Tantalum (ppm) 67 4.3 64 71 Borate / Peroxide Fusion ICP
Tb, Terbium (ppm) 52 2.3 49 54 Borate / Peroxide Fusion ICP
Tb4O7, Terbium(III,IV) oxide (ppm) 61 2.7 58 63 Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 772 29 745 799 Borate / Peroxide Fusion ICP
Ti, Titanium (wt.%) 5.18 0.236 4.95 5.41 Borate / Peroxide Fusion ICP
TiO2, Titanium dioxide (wt.%) 8.64 0.394 8.25 9.03 Borate / Peroxide Fusion ICP
Tm, Thulium (ppm) 4.03 0.253 3.80 4.25 Borate / Peroxide Fusion ICP
Tm2O3, Thulium(III) oxide (ppm) 4.59 0.278 4.35 4.84 Borate / Peroxide Fusion ICP
U, Uranium (ppm) 12.7 0.43 12.2 13.3 Borate / Peroxide Fusion ICP
V, Vanadium (ppm) 450 28 426 474 Borate / Peroxide Fusion ICP
V2O5, Vanadium(V) oxide (ppm) 803 50 761 846 Borate / Peroxide Fusion ICP
W, Tungsten (ppm) 5.62 1.01 5.17 6.06 Borate / Peroxide Fusion ICP
Y, Yttrium (ppm) 481 27 460 502 Borate / Peroxide Fusion ICP
Y2O3, Yttrium(III) oxide (ppm) 605 30 580 631 Borate / Peroxide Fusion ICP
Yb, Ytterbium (ppm) 17.7 0.88 16.6 18.7 Borate / Peroxide Fusion ICP
Yb2O3, Ytterbium(III) oxide (ppm) 19.9 0.93 18.7 21.0 Borate / Peroxide Fusion ICP
Zn, Zinc (ppm) 968 49 914 1022 Borate / Peroxide Fusion ICP
Zr, Zirconium (wt.%) 0.162 0.021 0.145 0.179 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 10.88 0.252 10.65 11.12 Borate Fusion XRF
BaO, Barium oxide (wt.%) 0.451 0.020 0.415 0.488 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.958 0.060 0.912 1.005 Borate Fusion XRF
CeO2, Cerium(IV) oxide (wt.%) 4.32 0.117 4.24 4.40 Borate Fusion XRF
Cr2O3, Chromium(III) oxide (ppm) 534 91 387 681 Borate Fusion XRF
Eu2O3, Europium(III) oxide (ppm) 263 60 151 374 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 44.30 1.581 43.01 45.59 Borate Fusion XRF
Gd2O3, Gadolinium(III) oxide (ppm) 735 104 619 852 Borate Fusion XRF
Ho2O3, Holmium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
K2O, Potassium oxide (wt.%) 0.018 0.004 0.015 0.022 Borate Fusion XRF
La2O3, Lanthanum(III) oxide (wt.%) 2.51 0.031 2.48 2.54 Borate Fusion XRF
Lu2O3, Lutetium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 0.467 0.035 0.438 0.496 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.318 0.014 0.300 0.335 Borate Fusion XRF
Nb2O5, Niobium(V) oxide (wt.%) 0.599 0.022 0.576 0.621 Borate Fusion XRF
Nd2O3, Neodymium(III) oxide (wt.%) 1.26 0.037 1.23 1.29 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 7.47 0.337 7.19 7.74 Borate Fusion XRF
Pr6O11, Praseodymium(III,IV) oxide (wt.%) 0.408 0.026 0.384 0.432 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 3.00 0.091 2.91 3.10 Borate Fusion XRF
Sm2O3, Samarium(III) oxide (wt.%) 0.143 0.011 0.131 0.154 Borate Fusion XRF
SrO, Strontium oxide (wt.%) 0.539 0.034 0.498 0.581 Borate Fusion XRF
Tb4O7, Terbium(III,IV) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
ThO2, Thorium dioxide (ppm) 859 48 806 911 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 8.90 0.242 8.70 9.09 Borate Fusion XRF
Tm2O3, Thulium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
U3O8, Uranium(V,VI) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
V2O5, Vanadium(V) oxide (ppm) 892 121 700 1084 Borate Fusion XRF
Y2O3, Yttrium(III) oxide (ppm) 588 69 472 703 Borate Fusion XRF
Yb2O3, Ytterbium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
ZrO2, Zirconium dioxide (wt.%) 0.232 0.014 0.211 0.254 Borate Fusion XRF
LOI1000, Loss on ignition @1000 °C (wt.%) 11.66 0.489 11.37 11.94 Thermogravimetry
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