OREAS 466

OREAS 466 is an ore grade, rare earth element (TREO + Y₂O₃ ~0.11%) 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 466 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.%) 0.044 0.003 0.041 0.046 Borate / Peroxide Fusion ICP
La2O3, Lanthanum(III) oxide (ppm) 279 17 264 294 Borate / Peroxide Fusion ICP
Nd2O3, Neodymium(III) oxide (ppm) 181 11 172 190 Borate / Peroxide Fusion ICP
Pr6O11, Praseodymium(III,IV) oxide (ppm) 54 3.0 51 57 Borate / Peroxide Fusion ICP
Ag, Silver (ppm) 0.322 0.040 0.258 0.386 4-Acid Digestion
Al, Aluminium (wt.%) 7.90 0.288 7.68 8.12 4-Acid Digestion
As, Arsenic (ppm) 481 18 463 500 4-Acid Digestion
Ba, Barium (ppm) 702 26 679 725 4-Acid Digestion
Be, Beryllium (ppm) 2.90 0.177 2.77 3.04 4-Acid Digestion
Bi, Bismuth (ppm) 22.1 1.66 20.5 23.7 4-Acid Digestion
Ca, Calcium (wt.%) 0.226 0.008 0.213 0.238 4-Acid Digestion
Ce, Cerium (ppm) 339 20 325 354 4-Acid Digestion
Co, Cobalt (ppm) 2.92 0.122 2.74 3.10 4-Acid Digestion
Cr, Chromium (ppm) 132 15 123 141 4-Acid Digestion
Cs, Caesium (ppm) 10.8 0.57 10.3 11.2 4-Acid Digestion
Cu, Copper (ppm) 34.1 1.39 32.7 35.6 4-Acid Digestion
Dy, Dysprosium (ppm) 5.57 0.260 5.20 5.94 4-Acid Digestion
Er, Erbium (ppm) 2.19 0.32 1.97 2.42 4-Acid Digestion
Eu, Europium (ppm) 4.26 0.171 3.96 4.55 4-Acid Digestion
Fe, Iron (wt.%) 4.97 0.171 4.81 5.13 4-Acid Digestion
Ga, Gallium (ppm) 22.4 1.30 21.3 23.4 4-Acid Digestion
Gd, Gadolinium (ppm) 11.4 0.88 10.5 12.3 4-Acid Digestion
Ge, Germanium (ppm) 0.42 0.08 0.32 0.52 4-Acid Digestion
Hf, Hafnium (ppm) 4.70 0.278 4.39 5.01 4-Acid Digestion
Ho, Holmium (ppm) 0.87 0.10 0.78 0.96 4-Acid Digestion
In, Indium (ppm) 0.12 0.012 0.11 0.14 4-Acid Digestion
K, Potassium (wt.%) 2.39 0.086 2.33 2.45 4-Acid Digestion
La, Lanthanum (ppm) 229 17 215 243 4-Acid Digestion
Li, Lithium (ppm) 43.9 1.65 42.4 45.3 4-Acid Digestion
Lu, Lutetium (ppm) 0.28 0.03 0.25 0.32 4-Acid Digestion
Mg, Magnesium (wt.%) 0.412 0.030 0.387 0.436 4-Acid Digestion
Mn, Manganese (wt.%) 0.009 0.001 0.009 0.010 4-Acid Digestion
Mo, Molybdenum (ppm) 6.42 0.356 6.07 6.76 4-Acid Digestion
Na, Sodium (wt.%) 0.164 0.013 0.153 0.175 4-Acid Digestion
Nb, Niobium (ppm) 109 9 104 115 4-Acid Digestion
Nd, Neodymium (ppm) 152 8 146 159 4-Acid Digestion
Ni, Nickel (ppm) 19.0 1.08 17.9 20.1 4-Acid Digestion
P, Phosphorus (wt.%) 0.055 0.002 0.052 0.057 4-Acid Digestion
Pb, Lead (ppm) 23.0 2.19 21.4 24.6 4-Acid Digestion
Pr, Praseodymium (ppm) 44.1 1.20 42.0 46.3 4-Acid Digestion
Rb, Rubidium (ppm) 140 6 134 147 4-Acid Digestion
S, Sulphur (wt.%) 0.012 0.003 0.009 0.014 4-Acid Digestion
Sb, Antimony (ppm) 5.45 0.198 5.24 5.65 4-Acid Digestion
Sc, Scandium (ppm) 18.8 1.37 17.9 19.8 4-Acid Digestion
Sm, Samarium (ppm) 20.8 0.76 19.5 22.2 4-Acid Digestion
Sn, Tin (ppm) 17.6 0.93 16.5 18.8 4-Acid Digestion
Sr, Strontium (ppm) 107 5 103 111 4-Acid Digestion
Ta, Tantalum (ppm) 2.56 0.27 2.37 2.76 4-Acid Digestion
Tb, Terbium (ppm) 1.26 0.105 1.16 1.37 4-Acid Digestion
Te, Tellurium (ppm) 0.30 0.05 0.23 0.38 4-Acid Digestion
Th, Thorium (ppm) 32.4 2.06 30.6 34.3 4-Acid Digestion
Ti, Titanium (wt.%) 0.448 0.043 0.412 0.484 4-Acid Digestion
Tl, Thallium (ppm) 0.79 0.059 0.72 0.85 4-Acid Digestion
Tm, Thulium (ppm) 0.27 0.03 0.24 0.30 4-Acid Digestion
U, Uranium (ppm) 3.04 0.220 2.86 3.22 4-Acid Digestion
V, Vanadium (ppm) 128 4 123 132 4-Acid Digestion
W, Tungsten (ppm) 90 6.7 83 97 4-Acid Digestion
Y, Yttrium (ppm) 20.3 1.38 19.0 21.6 4-Acid Digestion
Yb, Ytterbium (ppm) 1.83 0.161 1.67 1.98 4-Acid Digestion
Zn, Zinc (ppm) 41.8 2.19 39.9 43.8 4-Acid Digestion
Zr, Zirconium (ppm) 161 8 153 169 4-Acid Digestion
Al, Aluminium (wt.%) 8.34 0.171 8.18 8.51 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 15.77 0.324 15.46 16.08 Borate / Peroxide Fusion ICP
As, Arsenic (ppm) 472 34 431 514 Borate / Peroxide Fusion ICP
B, Boron (wt.%) 0.138 0.011 0.121 0.156 Borate / Peroxide Fusion ICP
Ba, Barium (ppm) 719 16 692 746 Borate / Peroxide Fusion ICP
BaO, Barium oxide (ppm) 803 18 773 832 Borate / Peroxide Fusion ICP
Be, Beryllium (ppm) 3.12 0.38 2.28 3.97 Borate / Peroxide Fusion ICP
Bi, Bismuth (ppm) 22.0 1.06 19.3 24.6 Borate / Peroxide Fusion ICP
Ca, Calcium (wt.%) 0.245 0.017 0.231 0.259 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 0.343 0.024 0.324 0.362 Borate / Peroxide Fusion ICP
Cd, Cadmium (ppm) < 10.0 IND IND IND Borate / Peroxide Fusion ICP
Ce, Cerium (wt.%) 0.036 0.002 0.034 0.038 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 3.26 0.38 2.59 3.92 Borate / Peroxide Fusion ICP
Cr, Chromium (ppm) 170 23 148 192 Borate / Peroxide Fusion ICP
Cr2O3, Chromium(III) oxide (ppm) 249 34 217 281 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) 10.9 0.34 10.2 11.5 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 35.6 3.08 30.5 40.6 Borate / Peroxide Fusion ICP
Dy, Dysprosium (ppm) 7.64 0.435 6.96 8.32 Borate / Peroxide Fusion ICP
Dy2O3, Dysprosium(III) oxide (ppm) 8.72 0.516 7.96 9.48 Borate / Peroxide Fusion ICP
Er, Erbium (ppm) 3.65 0.201 3.29 4.02 Borate / Peroxide Fusion ICP
Er2O3, Erbium(III) oxide (ppm) 4.24 0.299 3.79 4.69 Borate / Peroxide Fusion ICP
Eu, Europium (ppm) 4.42 0.202 4.09 4.74 Borate / Peroxide Fusion ICP
Eu2O3, Europium(III) oxide (ppm) 5.11 0.233 4.74 5.49 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 5.17 0.140 4.98 5.37 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 7.40 0.201 7.12 7.68 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 22.2 1.16 20.2 24.2 Borate / Peroxide Fusion ICP
Gd, Gadolinium (ppm) 12.1 0.49 11.4 12.9 Borate / Peroxide Fusion ICP
Gd2O3, Gadolinium(III) oxide (ppm) 14.0 0.53 13.2 14.8 Borate / Peroxide Fusion ICP
Hf, Hafnium (ppm) 7.50 0.436 6.73 8.27 Borate / Peroxide Fusion ICP
HfO2, Hafnium dioxide (ppm) 8.84 0.515 7.94 9.75 Borate / Peroxide Fusion ICP
Ho, Holmium (ppm) 1.37 0.066 1.25 1.48 Borate / Peroxide Fusion ICP
Ho2O3, Holmium(III) oxide (ppm) 1.56 0.076 1.43 1.70 Borate / Peroxide Fusion ICP
K, Potassium (wt.%) 2.41 0.064 2.29 2.52 Borate / Peroxide Fusion ICP
K2O, Potassium oxide (wt.%) 2.90 0.078 2.76 3.04 Borate / Peroxide Fusion ICP
La, Lanthanum (ppm) 238 15 225 251 Borate / Peroxide Fusion ICP
Li, Lithium (ppm) 44.4 2.34 41.4 47.4 Borate / Peroxide Fusion ICP
Lu, Lutetium (ppm) 0.47 0.036 0.41 0.53 Borate / Peroxide Fusion ICP
Lu2O3, Lutetium(III) oxide (ppm) 0.53 0.049 0.44 0.62 Borate / Peroxide Fusion ICP
Mg, Magnesium (wt.%) 0.486 0.024 0.457 0.514 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 0.805 0.040 0.758 0.852 Borate / Peroxide Fusion ICP
Mn, Manganese (wt.%) 0.010 0.000 0.009 0.011 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (wt.%) 0.013 0.000 0.012 0.014 Borate / Peroxide Fusion ICP
Mo, Molybdenum (ppm) 6.72 0.538 5.57 7.87 Borate / Peroxide Fusion ICP
Nb, Niobium (ppm) 113 6 107 119 Borate / Peroxide Fusion ICP
Nd, Neodymium (ppm) 155 10 147 163 Borate / Peroxide Fusion ICP
Ni, Nickel (ppm) 24.6 6.4 11.6 37.7 Borate / Peroxide Fusion ICP
P, Phosphorus (wt.%) 0.056 0.005 0.048 0.064 Borate / Peroxide Fusion ICP
P2O5, Phosphorus(V) oxide (wt.%) 0.128 0.010 0.111 0.146 Borate / Peroxide Fusion ICP
Pr, Praseodymium (ppm) 44.4 2.50 41.8 46.9 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 138 7 130 146 Borate / Peroxide Fusion ICP
Sc, Scandium (ppm) 19.2 3.2 15.4 22.9 Borate / Peroxide Fusion ICP
Si, Silicon (wt.%) 30.70 1.609 28.72 32.67 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 65.66 3.442 61.44 69.88 Borate / Peroxide Fusion ICP
Sm, Samarium (ppm) 21.0 1.29 19.6 22.4 Borate / Peroxide Fusion ICP
Sm2O3, Samarium(III) oxide (ppm) 24.3 1.49 22.7 26.0 Borate / Peroxide Fusion ICP
Sn, Tin (ppm) 20.5 1.32 19.2 21.8 Borate / Peroxide Fusion ICP
Sr, Strontium (ppm) 110 6 103 117 Borate / Peroxide Fusion ICP
Ta, Tantalum (ppm) 2.94 0.173 2.69 3.19 Borate / Peroxide Fusion ICP
Tb, Terbium (ppm) 1.48 0.091 1.36 1.61 Borate / Peroxide Fusion ICP
Tb4O7, Terbium(III,IV) oxide (ppm) 1.74 0.107 1.60 1.89 Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 31.9 1.65 30.3 33.5 Borate / Peroxide Fusion ICP
Ti, Titanium (wt.%) 0.587 0.016 0.566 0.607 Borate / Peroxide Fusion ICP
TiO2, Titanium dioxide (wt.%) 0.978 0.026 0.945 1.012 Borate / Peroxide Fusion ICP
Tm, Thulium (ppm) 0.51 0.030 0.44 0.57 Borate / Peroxide Fusion ICP
Tm2O3, Thulium(III) oxide (ppm) 0.58 0.035 0.50 0.65 Borate / Peroxide Fusion ICP
U, Uranium (ppm) 3.44 0.223 3.15 3.74 Borate / Peroxide Fusion ICP
V, Vanadium (ppm) 140 5 132 148 Borate / Peroxide Fusion ICP
V2O5, Vanadium(V) oxide (ppm) 250 9 235 265 Borate / Peroxide Fusion ICP
W, Tungsten (ppm) 94 5.1 88 101 Borate / Peroxide Fusion ICP
Y, Yttrium (ppm) 34.6 1.98 32.8 36.5 Borate / Peroxide Fusion ICP
Y2O3, Yttrium(III) oxide (ppm) 44.0 2.52 41.6 46.3 Borate / Peroxide Fusion ICP
Yb, Ytterbium (ppm) 3.29 0.176 2.96 3.63 Borate / Peroxide Fusion ICP
Yb2O3, Ytterbium(III) oxide (ppm) 3.72 0.256 3.30 4.13 Borate / Peroxide Fusion ICP
Zn, Zinc (ppm) 47.4 4.02 39.2 55.7 Borate / Peroxide Fusion ICP
Zr, Zirconium (ppm) 283 12 265 300 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 15.81 0.253 15.60 16.02 Borate Fusion XRF
BaO, Barium oxide (ppm) 755 70 663 847 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.318 0.020 0.298 0.338 Borate Fusion XRF
CeO2, Cerium(IV) oxide (wt.%) 0.044 0.007 0.034 0.053 Borate Fusion XRF
Cr2O3, Chromium(III) oxide (ppm) 197 50 151 243 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.%) 7.29 0.100 7.18 7.40 Borate Fusion XRF
Ho2O3, Holmium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
K2O, Potassium oxide (wt.%) 2.87 0.060 2.82 2.93 Borate Fusion XRF
La2O3, Lanthanum(III) oxide (wt.%) 0.030 0.000 0.029 0.031 Borate Fusion XRF
Lu2O3, Lutetium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 0.824 0.022 0.803 0.844 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.011 0.003 0.006 0.017 Borate Fusion XRF
Na2O, Sodium oxide (wt.%) 0.236 0.031 0.201 0.271 Borate Fusion XRF
Nb2O5, Niobium(V) oxide (ppm) 147 32 117 178 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.126 0.005 0.119 0.134 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 66.40 0.514 65.89 66.92 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) 112 22 83 141 Borate Fusion XRF
Tb4O7, Terbium(III,IV) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.986 0.015 0.967 1.004 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) 363 39 292 434 Borate Fusion XRF
LOI1000, Loss on ignition @1000 °C (wt.%) 4.00 0.307 3.82 4.19 Thermogravimetry
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