OREAS 464b

OREAS 464b is an ore grade, rare earth element (TREO + Y₂O₃ ~4.84%) 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 464b 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.%) 1.80 0.083 1.73 1.87 Borate / Peroxide Fusion ICP
La2O3, Lanthanum(III) oxide (wt.%) 1.29 0.056 1.24 1.34 Borate / Peroxide Fusion ICP
Nd2O3, Neodymium(III) oxide (wt.%) 1.09 0.066 1.04 1.14 Borate / Peroxide Fusion ICP
Pr6O11, Praseodymium(III,IV) oxide (wt.%) 0.287 0.011 0.274 0.300 Borate / Peroxide Fusion ICP
Ag, Silver (ppm) 3.31 0.62 2.82 3.80 4-Acid Digestion
Al, Aluminium (wt.%) 4.08 0.187 3.93 4.24 4-Acid Digestion
Ba, Barium (wt.%) 0.146 0.009 0.138 0.155 4-Acid Digestion
Be, Beryllium (ppm) 14.2 2.4 12.7 15.6 4-Acid Digestion
Bi, Bismuth (ppm) 3.51 0.184 3.32 3.71 4-Acid Digestion
Ca, Calcium (wt.%) 0.667 0.076 0.620 0.714 4-Acid Digestion
Cd, Cadmium (ppm) 0.51 0.14 0.42 0.61 4-Acid Digestion
Ce, Cerium (wt.%) 1.42 0.140 1.31 1.52 4-Acid Digestion
Co, Cobalt (ppm) 15.6 0.88 14.8 16.5 4-Acid Digestion
Cr, Chromium (ppm) 231 29 213 248 4-Acid Digestion
Cu, Copper (ppm) 82 6.0 78 87 4-Acid Digestion
Dy, Dysprosium (ppm) 148 17 133 162 4-Acid Digestion
Er, Erbium (ppm) 31.6 3.4 28.4 34.8 4-Acid Digestion
Eu, Europium (ppm) 281 38 251 312 4-Acid Digestion
Fe, Iron (wt.%) 32.48 1.472 31.54 33.42 4-Acid Digestion
Gd, Gadolinium (ppm) 582 101 495 668 4-Acid Digestion
Ho, Holmium (ppm) 17.3 1.8 15.6 19.0 4-Acid Digestion
In, Indium (ppm) 1.74 0.105 1.65 1.84 4-Acid Digestion
K, Potassium (wt.%) 0.072 0.011 0.063 0.081 4-Acid Digestion
La, Lanthanum (wt.%) 0.835 0.263 0.684 0.986 4-Acid Digestion
Li, Lithium (ppm) 7.33 0.504 6.94 7.71 4-Acid Digestion
Mg, Magnesium (wt.%) 0.666 0.083 0.615 0.716 4-Acid Digestion
Mn, Manganese (wt.%) 0.242 0.024 0.225 0.258 4-Acid Digestion
Mo, Molybdenum (ppm) 69 5.5 65 73 4-Acid Digestion
Na, Sodium (wt.%) 0.119 0.012 0.110 0.128 4-Acid Digestion
Nb, Niobium (wt.%) 0.183 0.023 0.167 0.198 4-Acid Digestion
Nd, Neodymium (wt.%) 0.888 0.125 0.795 0.981 4-Acid Digestion
Ni, Nickel (ppm) 65 4.5 60 69 4-Acid Digestion
P, Phosphorus (wt.%) 1.10 0.22 0.98 1.22 4-Acid Digestion
Pb, Lead (ppm) 175 28 159 190 4-Acid Digestion
Pr, Praseodymium (wt.%) 0.238 0.011 0.219 0.257 4-Acid Digestion
Rb, Rubidium (ppm) 3.87 0.44 3.51 4.22 4-Acid Digestion
S, Sulphur (wt.%) 0.099 0.007 0.090 0.109 4-Acid Digestion
Sb, Antimony (ppm) 1.69 0.124 1.53 1.85 4-Acid Digestion
Sc, Scandium (ppm) 101 22 89 113 4-Acid Digestion
Sm, Samarium (wt.%) 0.137 0.010 0.126 0.148 4-Acid Digestion
Sn, Tin (ppm) 33.9 2.10 32.4 35.4 4-Acid Digestion
Sr, Strontium (wt.%) 0.163 0.007 0.155 0.171 4-Acid Digestion
Ta, Tantalum (ppm) 22.1 1.50 20.9 23.3 4-Acid Digestion
Tb, Terbium (ppm) 49.2 8.5 42.3 56.1 4-Acid Digestion
Te, Tellurium (ppm) 0.32 0.05 0.27 0.37 4-Acid Digestion
Ti, Titanium (wt.%) 1.43 0.16 1.32 1.53 4-Acid Digestion
Tl, Thallium (ppm) 0.13 0.013 0.12 0.15 4-Acid Digestion
Tm, Thulium (ppm) 2.84 0.29 2.56 3.11 4-Acid Digestion
U, Uranium (ppm) 15.5 0.91 14.7 16.2 4-Acid Digestion
V, Vanadium (ppm) 191 17 181 201 4-Acid Digestion
W, Tungsten (ppm) 2.40 0.218 2.19 2.61 4-Acid Digestion
Y, Yttrium (ppm) 304 128 237 371 4-Acid Digestion
Yb, Ytterbium (ppm) 13.7 3.6 11.1 16.3 4-Acid Digestion
Zn, Zinc (wt.%) 0.101 0.010 0.095 0.107 4-Acid Digestion
Al, Aluminium (wt.%) 4.34 0.095 4.24 4.45 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 8.21 0.179 8.02 8.40 Borate / Peroxide Fusion ICP
Ba, Barium (wt.%) 0.159 0.007 0.151 0.167 Borate / Peroxide Fusion ICP
BaO, Barium oxide (wt.%) 0.177 0.007 0.168 0.186 Borate / Peroxide Fusion ICP
Be, Beryllium (ppm) 15.3 1.40 13.7 16.8 Borate / Peroxide Fusion ICP
Bi, Bismuth (ppm) 3.64 0.343 2.73 4.55 Borate / Peroxide Fusion ICP
Ca, Calcium (wt.%) 0.725 0.025 0.685 0.766 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 1.01 0.035 0.96 1.07 Borate / Peroxide Fusion ICP
Cd, Cadmium (ppm) < 10.0 IND IND IND Borate / Peroxide Fusion ICP
Ce, Cerium (wt.%) 1.46 0.067 1.41 1.52 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 16.4 1.08 15.1 17.7 Borate / Peroxide Fusion ICP
Cr, Chromium (ppm) 263 19 242 284 Borate / Peroxide Fusion ICP
Cr2O3, Chromium(III) oxide (ppm) 384 28 353 415 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 95 11 78 112 Borate / Peroxide Fusion ICP
Dy, Dysprosium (ppm) 158 6 152 163 Borate / Peroxide Fusion ICP
Dy2O3, Dysprosium(III) oxide (ppm) 181 6 174 187 Borate / Peroxide Fusion ICP
Er, Erbium (ppm) 33.8 2.32 31.9 35.7 Borate / Peroxide Fusion ICP
Er2O3, Erbium(III) oxide (ppm) 38.6 2.65 36.5 40.8 Borate / Peroxide Fusion ICP
Eu, Europium (ppm) 292 14 280 303 Borate / Peroxide Fusion ICP
Eu2O3, Europium(III) oxide (ppm) 338 16 325 351 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 33.42 0.758 32.22 34.62 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 47.78 1.084 46.07 49.49 Borate / Peroxide Fusion ICP
Gd, Gadolinium (ppm) 600 28 574 627 Borate / Peroxide Fusion ICP
Gd2O3, Gadolinium(III) oxide (ppm) 692 32 661 723 Borate / Peroxide Fusion ICP
Hf, Hafnium (ppm) 10.6 0.61 9.4 11.7 Borate / Peroxide Fusion ICP
HfO2, Hafnium dioxide (ppm) 12.5 0.72 11.1 13.8 Borate / Peroxide Fusion ICP
Ho, Holmium (ppm) 18.7 0.77 18.0 19.4 Borate / Peroxide Fusion ICP
Ho2O3, Holmium(III) oxide (ppm) 21.3 0.92 20.4 22.2 Borate / Peroxide Fusion ICP
In, Indium (ppm) 1.75 0.080 1.54 1.95 Borate / Peroxide Fusion ICP
La, Lanthanum (wt.%) 1.10 0.048 1.06 1.15 Borate / Peroxide Fusion ICP
Lu, Lutetium (ppm) 1.39 0.075 1.24 1.55 Borate / Peroxide Fusion ICP
Lu2O3, Lutetium(III) oxide (ppm) 1.58 0.085 1.40 1.76 Borate / Peroxide Fusion ICP
Mg, Magnesium (wt.%) 0.689 0.033 0.656 0.722 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 1.14 0.054 1.09 1.20 Borate / Peroxide Fusion ICP
Mn, Manganese (wt.%) 0.255 0.013 0.242 0.267 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (wt.%) 0.329 0.016 0.313 0.344 Borate / Peroxide Fusion ICP
Mo, Molybdenum (ppm) 68 4.6 60 75 Borate / Peroxide Fusion ICP
Nb, Niobium (wt.%) 0.182 0.016 0.170 0.193 Borate / Peroxide Fusion ICP
Nd, Neodymium (wt.%) 0.936 0.056 0.894 0.978 Borate / Peroxide Fusion ICP
Ni, Nickel (ppm) 66 9 56 76 Borate / Peroxide Fusion ICP
P, Phosphorus (wt.%) 1.24 0.076 1.09 1.39 Borate / Peroxide Fusion ICP
P2O5, Phosphorus(V) oxide (wt.%) 2.84 0.174 2.50 3.18 Borate / Peroxide Fusion ICP
Pb, Lead (ppm) 178 19 158 197 Borate / Peroxide Fusion ICP
Pr, Praseodymium (wt.%) 0.238 0.009 0.227 0.248 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 3.98 0.52 3.17 4.79 Borate / Peroxide Fusion ICP
S, Sulphur (wt.%) 0.096 0.008 0.082 0.110 Borate / Peroxide Fusion ICP
Sc, Scandium (ppm) 125 11 112 138 Borate / Peroxide Fusion ICP
Si, Silicon (wt.%) 8.40 0.564 7.68 9.11 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 17.96 1.207 16.42 19.49 Borate / Peroxide Fusion ICP
Sm, Samarium (wt.%) 0.131 0.007 0.125 0.138 Borate / Peroxide Fusion ICP
Sm2O3, Samarium(III) oxide (wt.%) 0.152 0.008 0.145 0.159 Borate / Peroxide Fusion ICP
Sn, Tin (ppm) 40.4 2.33 37.8 43.0 Borate / Peroxide Fusion ICP
Sr, Strontium (wt.%) 0.182 0.010 0.172 0.191 Borate / Peroxide Fusion ICP
Ta, Tantalum (ppm) 22.8 1.22 21.8 23.9 Borate / Peroxide Fusion ICP
Tb, Terbium (ppm) 48.2 2.80 45.8 50.7 Borate / Peroxide Fusion ICP
Tb4O7, Terbium(III,IV) oxide (ppm) 57 3.3 54 60 Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 470 22 452 489 Borate / Peroxide Fusion ICP
Ti, Titanium (wt.%) 1.76 0.048 1.69 1.82 Borate / Peroxide Fusion ICP
TiO2, Titanium dioxide (wt.%) 2.93 0.080 2.82 3.04 Borate / Peroxide Fusion ICP
Tm, Thulium (ppm) 3.15 0.229 2.95 3.36 Borate / Peroxide Fusion ICP
Tm2O3, Thulium(III) oxide (ppm) 3.59 0.256 3.37 3.81 Borate / Peroxide Fusion ICP
U, Uranium (ppm) 15.8 0.48 15.2 16.5 Borate / Peroxide Fusion ICP
V, Vanadium (ppm) 203 18 186 219 Borate / Peroxide Fusion ICP
V2O5, Vanadium(V) oxide (ppm) 362 32 333 391 Borate / Peroxide Fusion ICP
Y, Yttrium (ppm) 389 19 373 404 Borate / Peroxide Fusion ICP
Y2O3, Yttrium(III) oxide (ppm) 494 24 474 513 Borate / Peroxide Fusion ICP
Yb, Ytterbium (ppm) 13.5 0.60 12.6 14.4 Borate / Peroxide Fusion ICP
Yb2O3, Ytterbium(III) oxide (ppm) 15.5 0.89 14.4 16.6 Borate / Peroxide Fusion ICP
Zn, Zinc (wt.%) 0.101 0.007 0.095 0.107 Borate / Peroxide Fusion ICP
Zr, Zirconium (ppm) 420 23 390 451 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 8.05 0.257 7.84 8.26 Borate Fusion XRF
BaO, Barium oxide (wt.%) 0.177 0.008 0.165 0.189 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 1.01 0.038 0.98 1.05 Borate Fusion XRF
CeO2, Cerium(IV) oxide (wt.%) 1.79 0.035 1.76 1.82 Borate Fusion XRF
Cr2O3, Chromium(III) oxide (ppm) 383 67 298 469 Borate Fusion XRF
Eu2O3, Europium(III) oxide (ppm) 318 97 234 401 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 47.84 1.106 46.87 48.81 Borate Fusion XRF
Gd2O3, Gadolinium(III) oxide (ppm) 687 101 569 805 Borate Fusion XRF
Ho2O3, Holmium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
K2O, Potassium oxide (wt.%) 0.089 0.012 0.077 0.101 Borate Fusion XRF
La2O3, Lanthanum(III) oxide (wt.%) 1.32 0.032 1.30 1.35 Borate Fusion XRF
Lu2O3, Lutetium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 1.18 0.040 1.15 1.22 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.347 0.015 0.330 0.364 Borate Fusion XRF
Nb2O5, Niobium(V) oxide (wt.%) 0.250 0.008 0.240 0.261 Borate Fusion XRF
Nd2O3, Neodymium(III) oxide (wt.%) 1.09 0.028 1.07 1.11 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 2.90 0.143 2.80 3.01 Borate Fusion XRF
Pr6O11, Praseodymium(III,IV) oxide (wt.%) 0.293 0.019 0.276 0.310 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 18.26 0.553 17.81 18.70 Borate Fusion XRF
Sm2O3, Samarium(III) oxide (wt.%) 0.156 0.015 0.143 0.170 Borate Fusion XRF
SnO2, Tin dioxide (ppm) < 100 IND IND IND Borate Fusion XRF
SrO, Strontium oxide (wt.%) 0.220 0.018 0.196 0.244 Borate Fusion XRF
Tb4O7, Terbium(III,IV) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
ThO2, Thorium dioxide (ppm) 526 36 482 570 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 2.96 0.071 2.89 3.02 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) 392 75 253 531 Borate Fusion XRF
Y2O3, Yttrium(III) oxide (ppm) 491 40 409 572 Borate Fusion XRF
Yb2O3, Ytterbium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
ZrO2, Zirconium dioxide (ppm) 559 41 522 596 Borate Fusion XRF
LOI1000, Loss on ignition @1000 °C (wt.%) 10.43 1.15 9.80 11.06 Thermogravimetry
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