OREAS 467

OREAS 467 is an ore grade, rare earth element (TREO + Y₂O₃ ~0.19%) 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 467 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.%) 0.081 0.004 0.077 0.084 Borate / Peroxide Fusion ICP
La2O3, Lanthanum(III) oxide (wt.%) 0.056 0.003 0.053 0.058 Borate / Peroxide Fusion ICP
Nd2O3, Neodymium(III) oxide (wt.%) 0.034 0.002 0.033 0.036 Borate / Peroxide Fusion ICP
Pr6O11, Praseodymium(III,IV) oxide (ppm) 103 5 98 109 Borate / Peroxide Fusion ICP
Ag, Silver (ppm) 0.347 0.061 0.243 0.450 4-Acid Digestion
Al, Aluminium (wt.%) 7.68 0.267 7.42 7.94 4-Acid Digestion
As, Arsenic (ppm) 437 12 423 451 4-Acid Digestion
Ba, Barium (ppm) 726 20 697 756 4-Acid Digestion
Be, Beryllium (ppm) 2.78 0.234 2.60 2.96 4-Acid Digestion
Bi, Bismuth (ppm) 19.4 1.18 18.1 20.8 4-Acid Digestion
Ca, Calcium (wt.%) 0.248 0.010 0.234 0.263 4-Acid Digestion
Cd, Cadmium (ppm) 0.041 0.016 0.020 0.061 4-Acid Digestion
Ce, Cerium (ppm) 637 25 610 664 4-Acid Digestion
Co, Cobalt (ppm) 3.14 0.121 2.97 3.31 4-Acid Digestion
Cr, Chromium (ppm) 160 13 151 170 4-Acid Digestion
Cs, Caesium (ppm) 9.95 0.495 9.40 10.50 4-Acid Digestion
Cu, Copper (ppm) 34.0 1.11 32.4 35.6 4-Acid Digestion
Dy, Dysprosium (ppm) 8.33 0.557 7.82 8.83 4-Acid Digestion
Er, Erbium (ppm) 2.59 0.189 2.42 2.75 4-Acid Digestion
Eu, Europium (ppm) 8.15 0.412 7.69 8.62 4-Acid Digestion
Fe, Iron (wt.%) 7.38 0.255 7.15 7.61 4-Acid Digestion
Ga, Gallium (ppm) 23.2 1.46 21.8 24.6 4-Acid Digestion
Gd, Gadolinium (ppm) 19.8 1.95 18.3 21.3 4-Acid Digestion
Hf, Hafnium (ppm) 5.06 0.292 4.74 5.38 4-Acid Digestion
Ho, Holmium (ppm) 1.18 0.106 1.09 1.27 4-Acid Digestion
In, Indium (ppm) 0.16 0.011 0.15 0.17 4-Acid Digestion
K, Potassium (wt.%) 2.15 0.069 2.09 2.22 4-Acid Digestion
La, Lanthanum (ppm) 449 30 429 469 4-Acid Digestion
Li, Lithium (ppm) 40.8 1.50 39.5 42.1 4-Acid Digestion
Lu, Lutetium (ppm) 0.30 0.019 0.27 0.32 4-Acid Digestion
Mg, Magnesium (wt.%) 0.412 0.022 0.391 0.433 4-Acid Digestion
Mn, Manganese (wt.%) 0.013 0.001 0.012 0.013 4-Acid Digestion
Mo, Molybdenum (ppm) 10.1 0.55 9.5 10.6 4-Acid Digestion
Na, Sodium (wt.%) 0.158 0.018 0.144 0.171 4-Acid Digestion
Nb, Niobium (ppm) 222 11 211 232 4-Acid Digestion
Nd, Neodymium (ppm) 295 17 281 310 4-Acid Digestion
Ni, Nickel (ppm) 21.1 1.11 19.8 22.4 4-Acid Digestion
P, Phosphorus (wt.%) 0.081 0.003 0.078 0.084 4-Acid Digestion
Pb, Lead (ppm) 30.7 1.65 29.2 32.3 4-Acid Digestion
Pr, Praseodymium (ppm) 84 2.4 81 87 4-Acid Digestion
Rb, Rubidium (ppm) 130 6 123 136 4-Acid Digestion
Re, Rhenium (ppm) < 0.002 IND IND IND 4-Acid Digestion
S, Sulphur (wt.%) 0.011 0.001 0.010 0.012 4-Acid Digestion
Sb, Antimony (ppm) 5.16 0.201 4.84 5.48 4-Acid Digestion
Sc, Scandium (ppm) 20.0 0.84 19.0 21.0 4-Acid Digestion
Sm, Samarium (ppm) 38.8 1.71 36.7 40.8 4-Acid Digestion
Sn, Tin (ppm) 18.1 0.84 17.2 18.9 4-Acid Digestion
Sr, Strontium (ppm) 147 4 141 152 4-Acid Digestion
Ta, Tantalum (ppm) 4.34 0.53 3.99 4.70 4-Acid Digestion
Tb, Terbium (ppm) 1.99 0.186 1.83 2.15 4-Acid Digestion
Te, Tellurium (ppm) 0.29 0.028 0.25 0.34 4-Acid Digestion
Th, Thorium (ppm) 49.8 3.44 47.0 52.6 4-Acid Digestion
Ti, Titanium (wt.%) 0.544 0.030 0.515 0.573 4-Acid Digestion
Tl, Thallium (ppm) 0.71 0.055 0.66 0.77 4-Acid Digestion
Tm, Thulium (ppm) 0.31 0.03 0.28 0.35 4-Acid Digestion
U, Uranium (ppm) 3.18 0.243 2.98 3.38 4-Acid Digestion
V, Vanadium (ppm) 148 5 143 153 4-Acid Digestion
W, Tungsten (ppm) 74 5.0 69 79 4-Acid Digestion
Y, Yttrium (ppm) 25.8 1.30 24.5 27.1 4-Acid Digestion
Yb, Ytterbium (ppm) 1.99 0.182 1.81 2.17 4-Acid Digestion
Zn, Zinc (ppm) 49.0 2.95 46.5 51.5 4-Acid Digestion
Zr, Zirconium (ppm) 178 12 168 188 4-Acid Digestion
Al, Aluminium (wt.%) 8.16 0.127 7.89 8.42 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 15.41 0.241 14.91 15.92 Borate / Peroxide Fusion ICP
As, Arsenic (ppm) 443 35 422 465 Borate / Peroxide Fusion ICP
B, Boron (wt.%) 0.122 0.010 0.108 0.135 Borate / Peroxide Fusion ICP
Ba, Barium (ppm) 750 21 722 779 Borate / Peroxide Fusion ICP
BaO, Barium oxide (ppm) 826 32 794 859 Borate / Peroxide Fusion ICP
Be, Beryllium (ppm) 3.05 0.38 2.32 3.78 Borate / Peroxide Fusion ICP
Bi, Bismuth (ppm) 19.3 0.82 17.5 21.1 Borate / Peroxide Fusion ICP
Ca, Calcium (wt.%) 0.267 0.019 0.235 0.298 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 0.373 0.026 0.328 0.418 Borate / Peroxide Fusion ICP
Cd, Cadmium (ppm) < 10.0 IND IND IND Borate / Peroxide Fusion ICP
Ce, Cerium (wt.%) 0.066 0.003 0.063 0.068 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 3.54 0.351 3.18 3.90 Borate / Peroxide Fusion ICP
Cr, Chromium (ppm) 186 18 167 205 Borate / Peroxide Fusion ICP
Cr2O3, Chromium(III) oxide (ppm) 283 32 255 310 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) 10.1 0.64 9.2 11.0 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 34.6 3.20 26.5 42.7 Borate / Peroxide Fusion ICP
Dy, Dysprosium (ppm) 10.0 0.36 9.3 10.7 Borate / Peroxide Fusion ICP
Dy2O3, Dysprosium(III) oxide (ppm) 11.5 0.42 10.7 12.3 Borate / Peroxide Fusion ICP
Er, Erbium (ppm) 4.12 0.212 3.77 4.48 Borate / Peroxide Fusion ICP
Er2O3, Erbium(III) oxide (ppm) 4.70 0.236 4.32 5.09 Borate / Peroxide Fusion ICP
Eu, Europium (ppm) 8.20 0.317 7.68 8.72 Borate / Peroxide Fusion ICP
Eu2O3, Europium(III) oxide (ppm) 9.50 0.368 8.90 10.10 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 7.64 0.110 7.44 7.85 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 10.93 0.157 10.63 11.23 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 22.6 2.8 19.5 25.7 Borate / Peroxide Fusion ICP
Gd, Gadolinium (ppm) 19.9 1.05 18.8 20.9 Borate / Peroxide Fusion ICP
Gd2O3, Gadolinium(III) oxide (ppm) 22.9 1.21 21.7 24.1 Borate / Peroxide Fusion ICP
Hf, Hafnium (ppm) 8.13 0.469 7.31 8.95 Borate / Peroxide Fusion ICP
HfO2, Hafnium dioxide (ppm) 9.59 0.554 8.62 10.56 Borate / Peroxide Fusion ICP
Ho, Holmium (ppm) 1.64 0.080 1.50 1.79 Borate / Peroxide Fusion ICP
Ho2O3, Holmium(III) oxide (ppm) 1.88 0.092 1.71 2.05 Borate / Peroxide Fusion ICP
K, Potassium (wt.%) 2.24 0.097 2.12 2.36 Borate / Peroxide Fusion ICP
K2O, Potassium oxide (wt.%) 2.70 0.116 2.55 2.84 Borate / Peroxide Fusion ICP
La, Lanthanum (wt.%) 0.048 0.002 0.045 0.050 Borate / Peroxide Fusion ICP
Li, Lithium (ppm) 41.7 2.25 38.6 44.7 Borate / Peroxide Fusion ICP
Lu, Lutetium (ppm) 0.47 0.028 0.42 0.53 Borate / Peroxide Fusion ICP
Lu2O3, Lutetium(III) oxide (ppm) 0.54 0.032 0.48 0.60 Borate / Peroxide Fusion ICP
Mg, Magnesium (wt.%) 0.489 0.020 0.468 0.511 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 0.812 0.033 0.775 0.848 Borate / Peroxide Fusion ICP
Mn, Manganese (wt.%) 0.014 0.001 0.013 0.015 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (wt.%) 0.018 0.001 0.017 0.019 Borate / Peroxide Fusion ICP
Mo, Molybdenum (ppm) 10.2 0.78 8.7 11.8 Borate / Peroxide Fusion ICP
Nb, Niobium (ppm) 239 19 224 253 Borate / Peroxide Fusion ICP
Nd, Neodymium (wt.%) 0.029 0.001 0.028 0.031 Borate / Peroxide Fusion ICP
Ni, Nickel (ppm) 26.3 7.6 13.4 39.3 Borate / Peroxide Fusion ICP
P, Phosphorus (wt.%) 0.083 0.009 0.072 0.093 Borate / Peroxide Fusion ICP
P2O5, Phosphorus(V) oxide (wt.%) 0.190 0.021 0.166 0.213 Borate / Peroxide Fusion ICP
Pr, Praseodymium (ppm) 85 4.1 81 90 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 125 8 117 133 Borate / Peroxide Fusion ICP
Sc, Scandium (ppm) 20.3 2.1 17.6 22.9 Borate / Peroxide Fusion ICP
Si, Silicon (wt.%) 29.15 1.653 27.34 30.97 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 62.37 3.536 58.49 66.24 Borate / Peroxide Fusion ICP
Sm, Samarium (ppm) 38.2 2.43 35.7 40.6 Borate / Peroxide Fusion ICP
Sm2O3, Samarium(III) oxide (ppm) 44.3 2.82 41.4 47.1 Borate / Peroxide Fusion ICP
Sn, Tin (ppm) 20.7 1.37 19.0 22.3 Borate / Peroxide Fusion ICP
Sr, Strontium (ppm) 153 12 140 165 Borate / Peroxide Fusion ICP
Ta, Tantalum (ppm) 4.91 0.420 4.43 5.40 Borate / Peroxide Fusion ICP
Tb, Terbium (ppm) 2.15 0.137 1.99 2.30 Borate / Peroxide Fusion ICP
Tb4O7, Terbium(III,IV) oxide (ppm) 2.53 0.163 2.35 2.71 Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 48.2 1.42 46.5 50.0 Borate / Peroxide Fusion ICP
Ti, Titanium (wt.%) 0.712 0.022 0.686 0.738 Borate / Peroxide Fusion ICP
TiO2, Titanium dioxide (wt.%) 1.19 0.037 1.14 1.23 Borate / Peroxide Fusion ICP
Tm, Thulium (ppm) 0.54 0.040 0.45 0.62 Borate / Peroxide Fusion ICP
Tm2O3, Thulium(III) oxide (ppm) 0.63 0.058 0.54 0.72 Borate / Peroxide Fusion ICP
U, Uranium (ppm) 3.55 0.153 3.34 3.77 Borate / Peroxide Fusion ICP
V, Vanadium (ppm) 161 6 151 170 Borate / Peroxide Fusion ICP
V2O5, Vanadium(V) oxide (ppm) 287 11 269 304 Borate / Peroxide Fusion ICP
W, Tungsten (ppm) 79 4.8 72 86 Borate / Peroxide Fusion ICP
Y, Yttrium (ppm) 40.3 1.44 38.4 42.3 Borate / Peroxide Fusion ICP
Y2O3, Yttrium(III) oxide (ppm) 51 1.8 49 54 Borate / Peroxide Fusion ICP
Yb, Ytterbium (ppm) 3.37 0.160 3.06 3.69 Borate / Peroxide Fusion ICP
Yb2O3, Ytterbium(III) oxide (ppm) 3.77 0.229 3.42 4.13 Borate / Peroxide Fusion ICP
Zn, Zinc (ppm) 51 5 42 61 Borate / Peroxide Fusion ICP
Zr, Zirconium (ppm) 320 15 304 335 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 15.28 0.282 15.05 15.52 Borate Fusion XRF
BaO, Barium oxide (ppm) 750 64 688 812 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.344 0.016 0.329 0.359 Borate Fusion XRF
CeO2, Cerium(IV) oxide (wt.%) 0.080 0.008 0.075 0.084 Borate Fusion XRF
Cr2O3, Chromium(III) oxide (ppm) 249 74 161 338 Borate Fusion XRF
Dy2O3, Dysprosium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
Er2O3, Erbium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
Eu2O3, Europium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 10.85 0.189 10.68 11.02 Borate Fusion XRF
Ho2O3, Holmium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
K2O, Potassium oxide (wt.%) 2.59 0.075 2.53 2.66 Borate Fusion XRF
La2O3, Lanthanum(III) oxide (wt.%) 0.053 0.007 0.045 0.062 Borate Fusion XRF
Lu2O3, Lutetium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 0.827 0.021 0.809 0.845 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.018 0.003 0.013 0.023 Borate Fusion XRF
Na2O, Sodium oxide (wt.%) 0.224 0.044 0.183 0.264 Borate Fusion XRF
Nb2O5, Niobium(V) oxide (ppm) 317 33 274 359 Borate Fusion XRF
Nd2O3, Neodymium(III) oxide (wt.%) 0.031 0.007 0.021 0.040 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.188 0.008 0.178 0.197 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 62.44 0.687 61.78 63.09 Borate Fusion XRF
Sm2O3, Samarium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
SnO2, Tin dioxide (ppm) < 100 IND IND IND Borate Fusion XRF
SrO, Strontium oxide (ppm) 183 19 162 204 Borate Fusion XRF
Tb4O7, Terbium(III,IV) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
ThO2, Thorium dioxide (ppm) 63 14 28 98 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 1.19 0.015 1.17 1.21 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
Yb2O3, Ytterbium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
ZrO2, Zirconium dioxide (ppm) 390 24 366 414 Borate Fusion XRF
LOI1000, Loss on ignition @1000 °C (wt.%) 4.60 0.453 4.36 4.85 Thermogravimetry
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