OREAS 460b

OREAS 460b is an ore grade, rare earth element (TREO + Y₂O₃ ~0.48%) 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 460b 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.%) 0.206 0.011 0.197 0.215 Borate / Peroxide Fusion ICP
La2O3, Lanthanum(III) oxide (wt.%) 0.143 0.005 0.138 0.147 Borate / Peroxide Fusion ICP
Nd2O3, Neodymium(III) oxide (wt.%) 0.088 0.005 0.083 0.092 Borate / Peroxide Fusion ICP
Pr6O11, Praseodymium(III,IV) oxide (ppm) 262 11 251 274 Borate / Peroxide Fusion ICP
Ag, Silver (ppm) 0.331 0.085 0.290 0.372 4-Acid Digestion
Al, Aluminium (wt.%) 6.92 0.210 6.73 7.12 4-Acid Digestion
As, Arsenic (ppm) 284 14 273 295 4-Acid Digestion
Ba, Barium (ppm) 788 21 766 809 4-Acid Digestion
Be, Beryllium (ppm) 2.34 0.123 2.17 2.50 4-Acid Digestion
Bi, Bismuth (ppm) 12.8 0.77 11.8 13.9 4-Acid Digestion
Ca, Calcium (wt.%) 0.539 0.020 0.521 0.557 4-Acid Digestion
Ce, Cerium (wt.%) 0.163 0.007 0.157 0.168 4-Acid Digestion
Co, Cobalt (ppm) 5.54 0.216 5.30 5.79 4-Acid Digestion
Cr, Chromium (ppm) 259 14 248 270 4-Acid Digestion
Cs, Caesium (ppm) 6.41 0.230 6.18 6.65 4-Acid Digestion
Cu, Copper (ppm) 41.0 2.40 38.8 43.1 4-Acid Digestion
Dy, Dysprosium (ppm) 16.8 0.83 15.8 17.8 4-Acid Digestion
Er, Erbium (ppm) 4.36 0.307 4.02 4.71 4-Acid Digestion
Eu, Europium (ppm) 20.7 0.83 19.6 21.7 4-Acid Digestion
Fe, Iron (wt.%) 15.54 0.590 15.05 16.03 4-Acid Digestion
Ga, Gallium (ppm) 28.6 3.8 26.0 31.3 4-Acid Digestion
Gd, Gadolinium (ppm) 46.4 4.57 42.8 49.9 4-Acid Digestion
Ge, Germanium (ppm) 1.55 0.32 1.28 1.83 4-Acid Digestion
Hf, Hafnium (ppm) 6.19 0.425 5.79 6.60 4-Acid Digestion
Ho, Holmium (ppm) 2.14 0.120 2.00 2.28 4-Acid Digestion
In, Indium (ppm) 0.31 0.015 0.29 0.33 4-Acid Digestion
K, Potassium (wt.%) 1.40 0.052 1.36 1.44 4-Acid Digestion
La, Lanthanum (wt.%) 0.120 0.009 0.113 0.126 4-Acid Digestion
Li, Lithium (ppm) 29.8 1.07 29.0 30.7 4-Acid Digestion
Lu, Lutetium (ppm) 0.32 0.017 0.30 0.35 4-Acid Digestion
Mg, Magnesium (wt.%) 0.590 0.025 0.569 0.610 4-Acid Digestion
Mn, Manganese (wt.%) 0.029 0.001 0.028 0.030 4-Acid Digestion
Mo, Molybdenum (ppm) 22.3 0.76 21.3 23.3 4-Acid Digestion
Na, Sodium (wt.%) 0.152 0.018 0.140 0.163 4-Acid Digestion
Nb, Niobium (ppm) 630 56 588 673 4-Acid Digestion
Nd, Neodymium (wt.%) 0.075 0.004 0.072 0.077 4-Acid Digestion
Ni, Nickel (ppm) 32.5 1.54 30.9 34.2 4-Acid Digestion
P, Phosphorus (wt.%) 0.169 0.006 0.163 0.175 4-Acid Digestion
Pb, Lead (ppm) 56 3.6 53 59 4-Acid Digestion
Pr, Praseodymium (ppm) 220 7 212 229 4-Acid Digestion
Rb, Rubidium (ppm) 82 4.2 77 86 4-Acid Digestion
S, Sulphur (wt.%) 0.028 0.006 0.023 0.034 4-Acid Digestion
Sb, Antimony (ppm) 4.08 0.168 3.82 4.34 4-Acid Digestion
Sc, Scandium (ppm) 26.3 0.91 25.2 27.4 4-Acid Digestion
Sm, Samarium (ppm) 96 4.3 91 101 4-Acid Digestion
Sn, Tin (ppm) 19.6 1.40 18.4 20.7 4-Acid Digestion
Sr, Strontium (ppm) 287 16 275 298 4-Acid Digestion
Ta, Tantalum (ppm) 11.5 0.50 11.0 12.0 4-Acid Digestion
Tb, Terbium (ppm) 4.34 0.368 4.01 4.68 4-Acid Digestion
Te, Tellurium (ppm) 0.31 0.04 0.25 0.37 4-Acid Digestion
Th, Thorium (ppm) 105 5 101 109 4-Acid Digestion
Ti, Titanium (wt.%) 0.934 0.039 0.897 0.971 4-Acid Digestion
Tl, Thallium (ppm) 0.48 0.033 0.44 0.51 4-Acid Digestion
Tm, Thulium (ppm) 0.44 0.033 0.41 0.47 4-Acid Digestion
U, Uranium (ppm) 3.48 0.259 3.30 3.66 4-Acid Digestion
V, Vanadium (ppm) 222 9 214 231 4-Acid Digestion
W, Tungsten (ppm) 44.9 3.82 42.0 47.8 4-Acid Digestion
Y, Yttrium (ppm) 44.4 2.93 42.4 46.5 4-Acid Digestion
Yb, Ytterbium (ppm) 2.45 0.163 2.25 2.65 4-Acid Digestion
Zn, Zinc (ppm) 73 2.3 71 76 4-Acid Digestion
Zr, Zirconium (ppm) 228 16 215 240 4-Acid Digestion
Al, Aluminium (wt.%) 7.22 0.131 7.07 7.37 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 13.64 0.248 13.37 13.92 Borate / Peroxide Fusion ICP
As, Arsenic (ppm) 286 15 268 304 Borate / Peroxide Fusion ICP
Ba, Barium (ppm) 794 28 763 825 Borate / Peroxide Fusion ICP
BaO, Barium oxide (ppm) 887 32 852 921 Borate / Peroxide Fusion ICP
Be, Beryllium (ppm) 2.58 0.41 1.79 3.37 Borate / Peroxide Fusion ICP
Bi, Bismuth (ppm) 13.0 0.83 11.3 14.8 Borate / Peroxide Fusion ICP
Ca, Calcium (wt.%) 0.559 0.032 0.519 0.599 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 0.782 0.045 0.727 0.838 Borate / Peroxide Fusion ICP
Cd, Cadmium (ppm) < 10.0 IND IND IND Borate / Peroxide Fusion ICP
Ce, Cerium (wt.%) 0.168 0.009 0.160 0.175 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 6.21 0.82 4.60 7.82 Borate / Peroxide Fusion ICP
Cr, Chromium (ppm) 280 31 252 308 Borate / Peroxide Fusion ICP
Cr2O3, Chromium(III) oxide (ppm) 409 45 369 450 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) 6.52 0.249 5.99 7.04 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 43.8 4.6 35.9 51.7 Borate / Peroxide Fusion ICP
Dy, Dysprosium (ppm) 17.7 0.81 16.7 18.6 Borate / Peroxide Fusion ICP
Dy2O3, Dysprosium(III) oxide (ppm) 20.3 0.93 19.2 21.4 Borate / Peroxide Fusion ICP
Er, Erbium (ppm) 5.50 0.301 5.08 5.92 Borate / Peroxide Fusion ICP
Er2O3, Erbium(III) oxide (ppm) 6.29 0.345 5.81 6.77 Borate / Peroxide Fusion ICP
Eu, Europium (ppm) 20.5 0.71 19.5 21.5 Borate / Peroxide Fusion ICP
Eu2O3, Europium(III) oxide (ppm) 23.6 0.88 22.4 24.8 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 16.05 0.355 15.60 16.51 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 22.95 0.508 22.30 23.60 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 26.1 4.7 19.4 32.8 Borate / Peroxide Fusion ICP
Gd, Gadolinium (ppm) 45.3 2.84 42.6 48.0 Borate / Peroxide Fusion ICP
Gd2O3, Gadolinium(III) oxide (ppm) 52 3.3 49 55 Borate / Peroxide Fusion ICP
Hf, Hafnium (ppm) 10.0 0.19 9.7 10.3 Borate / Peroxide Fusion ICP
HfO2, Hafnium dioxide (ppm) 11.8 0.22 11.5 12.2 Borate / Peroxide Fusion ICP
Ho, Holmium (ppm) 2.54 0.110 2.36 2.72 Borate / Peroxide Fusion ICP
Ho2O3, Holmium(III) oxide (ppm) 2.91 0.126 2.71 3.12 Borate / Peroxide Fusion ICP
In, Indium (ppm) 0.33 0.05 0.21 0.45 Borate / Peroxide Fusion ICP
K, Potassium (wt.%) 1.46 0.096 1.32 1.59 Borate / Peroxide Fusion ICP
K2O, Potassium oxide (wt.%) 1.73 0.069 1.66 1.81 Borate / Peroxide Fusion ICP
La, Lanthanum (wt.%) 0.122 0.004 0.118 0.125 Borate / Peroxide Fusion ICP
Li, Lithium (ppm) 30.8 1.36 27.8 33.8 Borate / Peroxide Fusion ICP
Lu, Lutetium (ppm) 0.46 0.038 0.38 0.53 Borate / Peroxide Fusion ICP
Lu2O3, Lutetium(III) oxide (ppm) 0.53 0.042 0.44 0.61 Borate / Peroxide Fusion ICP
Mg, Magnesium (wt.%) 0.648 0.024 0.628 0.668 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 1.08 0.040 1.04 1.11 Borate / Peroxide Fusion ICP
Mn, Manganese (wt.%) 0.031 0.001 0.030 0.032 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (wt.%) 0.040 0.002 0.038 0.041 Borate / Peroxide Fusion ICP
Mo, Molybdenum (ppm) 22.9 1.94 19.7 26.2 Borate / Peroxide Fusion ICP
Nb, Niobium (ppm) 645 47 608 681 Borate / Peroxide Fusion ICP
Nd, Neodymium (wt.%) 0.075 0.004 0.072 0.078 Borate / Peroxide Fusion ICP
Ni, Nickel (ppm) 36.6 6.8 24.3 48.9 Borate / Peroxide Fusion ICP
P, Phosphorus (wt.%) 0.173 0.013 0.158 0.187 Borate / Peroxide Fusion ICP
P2O5, Phosphorus(V) oxide (wt.%) 0.396 0.030 0.363 0.430 Borate / Peroxide Fusion ICP
Pr, Praseodymium (ppm) 217 9 208 227 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 82 3.4 77 87 Borate / Peroxide Fusion ICP
Sc, Scandium (ppm) 29.4 1.48 27.2 31.6 Borate / Peroxide Fusion ICP
Si, Silicon (wt.%) 24.01 0.504 23.09 24.93 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 51.36 1.077 49.39 53.32 Borate / Peroxide Fusion ICP
Sm, Samarium (ppm) 94 6.0 89 99 Borate / Peroxide Fusion ICP
Sm2O3, Samarium(III) oxide (ppm) 109 7 103 115 Borate / Peroxide Fusion ICP
Sn, Tin (ppm) 22.5 1.40 20.5 24.5 Borate / Peroxide Fusion ICP
Sr, Strontium (ppm) 287 16 268 306 Borate / Peroxide Fusion ICP
Ta, Tantalum (ppm) 11.7 0.64 10.9 12.6 Borate / Peroxide Fusion ICP
Tb, Terbium (ppm) 4.34 0.206 4.11 4.58 Borate / Peroxide Fusion ICP
Tb4O7, Terbium(III,IV) oxide (ppm) 5.11 0.242 4.83 5.39 Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 104 4 100 109 Borate / Peroxide Fusion ICP
Ti, Titanium (wt.%) 1.11 0.020 1.08 1.13 Borate / Peroxide Fusion ICP
TiO2, Titanium dioxide (wt.%) 1.85 0.033 1.80 1.89 Borate / Peroxide Fusion ICP
Tm, Thulium (ppm) 0.61 0.045 0.56 0.66 Borate / Peroxide Fusion ICP
Tm2O3, Thulium(III) oxide (ppm) 0.70 0.052 0.62 0.78 Borate / Peroxide Fusion ICP
U, Uranium (ppm) 3.80 0.137 3.61 3.98 Borate / Peroxide Fusion ICP
V, Vanadium (ppm) 233 10 222 243 Borate / Peroxide Fusion ICP
V2O5, Vanadium(V) oxide (ppm) 416 18 397 434 Borate / Peroxide Fusion ICP
W, Tungsten (ppm) 48.8 3.00 44.8 52.8 Borate / Peroxide Fusion ICP
Y, Yttrium (ppm) 55 3.1 53 58 Borate / Peroxide Fusion ICP
Y2O3, Yttrium(III) oxide (ppm) 70 4.0 67 74 Borate / Peroxide Fusion ICP
Yb, Ytterbium (ppm) 3.47 0.194 3.15 3.79 Borate / Peroxide Fusion ICP
Yb2O3, Ytterbium(III) oxide (ppm) 3.95 0.221 3.58 4.32 Borate / Peroxide Fusion ICP
Zn, Zinc (ppm) 76 12 52 99 Borate / Peroxide Fusion ICP
Zr, Zirconium (ppm) 415 16 392 438 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 13.76 0.204 13.57 13.95 Borate Fusion XRF
BaO, Barium oxide (ppm) 817 70 718 915 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.751 0.020 0.733 0.768 Borate Fusion XRF
CeO2, Cerium(IV) oxide (wt.%) 0.197 0.011 0.184 0.210 Borate Fusion XRF
Cr2O3, Chromium(III) oxide (ppm) 394 18 371 418 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.%) 22.92 0.252 22.68 23.17 Borate Fusion XRF
Gd2O3, Gadolinium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
Ho2O3, Holmium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
K2O, Potassium oxide (wt.%) 1.68 0.033 1.64 1.71 Borate Fusion XRF
La2O3, Lanthanum(III) oxide (wt.%) 0.143 0.008 0.130 0.155 Borate Fusion XRF
Lu2O3, Lutetium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 1.09 0.030 1.06 1.12 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.039 0.003 0.036 0.042 Borate Fusion XRF
Na2O, Sodium oxide (wt.%) 0.173 0.052 0.134 0.213 Borate Fusion XRF
Nb2O5, Niobium(V) oxide (ppm) 885 51 802 968 Borate Fusion XRF
Nd2O3, Neodymium(III) oxide (wt.%) 0.084 0.012 0.073 0.095 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.390 0.017 0.376 0.405 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 49.47 0.882 48.74 50.20 Borate Fusion XRF
SnO2, Tin dioxide (ppm) < 100 IND IND IND Borate Fusion XRF
SrO, Strontium oxide (ppm) 304 38 224 384 Borate Fusion XRF
Tb4O7, Terbium(III,IV) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
ThO2, Thorium dioxide (ppm) 134 20 110 159 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 1.85 0.035 1.82 1.88 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) 521 42 428 615 Borate Fusion XRF
LOI1000, Loss on ignition @1000 °C (wt.%) 6.08 0.560 5.75 6.41 Thermogravimetry
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