OREAS 474

OREAS 474 is a certified reference material (CRM) produced from a blend of clay-hosted rare earth element (REE) ores and barren kaolin. The REE-bearing ores were sourced from the Jupiter deposit in the Laverton region of Western Australia.
Mineralisation occurs within a deeply weathered regolith developed over an underlying carbonatite–alkaline volcanic sequence. Supergene processes have resulted in enrichment of total rare earth oxides (TREO), including a significant proportion of magnet rare earth oxides (MREO), notably neodymium and praseodymium, with subordinate dysprosium and terbium. The CRM matrix is quartz-rich and comprises abundant mica–illite and kaolinite-group clays, with additional smectite/vermiculite-type clay minerals. Minor iron oxides (goethite and magnetite), traces of hematite and anatase are present as accessory phases. Rare earth elements are interpreted to occur predominantly within fine-grained secondary phases associated with the clay fraction.

Twenty-nine commercial analytical laboratories participated in the program to certify the elements reported below using the following methods:

  • Lithium borate or sodium peroxide fusion with full suite ICP-OES and ICP-MS elemental package
  • Thermogravimetric LOI at 1000 °C
  • Borate/Peroxide Fusion – Full ICP-OES and MS elemental suites
  • 4-Acid – Full ICP-OES and MS elemental suites

Homogeneity was evaluated using 12 subsamples analysed by oxidising fusion with lithium borate fusion with ICP-MS finish. ANOVA was applied to duplicates from six 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
Dy2O3, Dysprosium(III) oxide (ppm) 15.6 0.76 15.0 16.3 Borate / Peroxide Fusion ICP
Nd2O3, Neodymium(III) oxide (ppm) 348 14 336 360 Borate / Peroxide Fusion ICP
Pr6O11, Praseodymium(III,IV) oxide (ppm) 102 3 99 104 Borate / Peroxide Fusion ICP
Tb4O7, Terbium(III,IV) oxide (ppm) 3.42 0.191 3.25 3.59 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 24.15 0.793 23.37 24.94 Borate / Peroxide Fusion ICP
Ba, Barium (wt.%) 0.446 0.015 0.434 0.458 Borate / Peroxide Fusion ICP
Be, Beryllium (ppm) 3.16 0.42 2.26 4.06 Borate / Peroxide Fusion ICP
Bi, Bismuth (ppm) 0.42 0.05 0.33 0.50 Borate / Peroxide Fusion ICP
CaO, Calcium oxide (wt.%) 0.467 0.039 0.441 0.493 Borate / Peroxide Fusion ICP
CeO2, Cerium(IV) oxide (ppm) 931 33 900 961 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 13.4 0.87 12.8 14.1 Borate / Peroxide Fusion ICP
Cr, Chromium (ppm) 68 6.3 61 75 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) 9.53 0.440 9.06 9.99 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 70 11 59 80 Borate / Peroxide Fusion ICP
Er2O3, Erbium(III) oxide (ppm) 6.97 0.311 6.66 7.27 Borate / Peroxide Fusion ICP
Eu2O3, Europium(III) oxide (ppm) 10.2 0.49 9.6 10.7 Borate / Peroxide Fusion ICP
Fe2O3, Iron(III) oxide (wt.%) 10.79 0.175 10.61 10.97 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 33.6 3.05 31.2 36.0 Borate / Peroxide Fusion ICP
Gd2O3, Gadolinium(III) oxide (ppm) 29.3 1.70 28.0 30.5 Borate / Peroxide Fusion ICP
Hf, Hafnium (ppm) 13.1 0.61 12.3 13.8 Borate / Peroxide Fusion ICP
Ho2O3, Holmium(III) oxide (ppm) 2.66 0.147 2.51 2.81 Borate / Peroxide Fusion ICP
In, Indium (ppm) < 0.20 IND IND IND Borate / Peroxide Fusion ICP
K2O, Potassium oxide (wt.%) 3.14 0.057 3.07 3.21 Borate / Peroxide Fusion ICP
La2O3, Lanthanum(III) oxide (ppm) 428 17 416 440 Borate / Peroxide Fusion ICP
Li, Lithium (ppm) 16.7 1.7 14.6 18.9 Borate / Peroxide Fusion ICP
Lu2O3, Lutetium(III) oxide (ppm) 0.79 0.047 0.73 0.85 Borate / Peroxide Fusion ICP
MgO, Magnesium oxide (wt.%) 0.992 0.038 0.966 1.019 Borate / Peroxide Fusion ICP
MnO, Manganese oxide (wt.%) 0.058 0.002 0.056 0.060 Borate / Peroxide Fusion ICP
Mo, Molybdenum (ppm) 2.05 0.089 1.95 2.14 Borate / Peroxide Fusion ICP
Na2O, Sodium oxide (wt.%) 0.632 0.028 0.607 0.657 Borate / Peroxide Fusion ICP
Nb, Niobium (ppm) 20.9 1.93 19.2 22.6 Borate / Peroxide Fusion ICP
Ni, Nickel (ppm) 39.0 6.0 32.0 46.0 Borate / Peroxide Fusion ICP
P2O5, Phosphorus(V) oxide (wt.%) 0.678 0.025 0.656 0.700 Borate / Peroxide Fusion ICP
Pb, Lead (ppm) 52 2.5 49 54 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 132 6 127 136 Borate / Peroxide Fusion ICP
S, Sulphur (wt.%) 0.040 0.011 0.025 0.056 Borate / Peroxide Fusion ICP
Sb, Antimony (ppm) 1.04 0.16 0.79 1.29 Borate / Peroxide Fusion ICP
Sc, Scandium (ppm) 24.5 2.21 22.7 26.3 Borate / Peroxide Fusion ICP
SiO2, Silicon dioxide (wt.%) 47.14 1.076 46.29 48.00 Borate / Peroxide Fusion ICP
Sm2O3, Samarium(III) oxide (ppm) 48.6 2.22 46.3 50.9 Borate / Peroxide Fusion ICP
Sn, Tin (ppm) 5.15 0.444 4.40 5.91 Borate / Peroxide Fusion ICP
Sr, Strontium (ppm) 773 20 748 799 Borate / Peroxide Fusion ICP
Ta, Tantalum (ppm) 1.25 0.117 1.15 1.35 Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 32.8 1.60 31.6 34.0 Borate / Peroxide Fusion ICP
Ti, Titanium (wt.%) 1.17 0.067 1.12 1.21 Borate / Peroxide Fusion ICP
Tl, Thallium (ppm) 0.77 0.13 0.64 0.89 Borate / Peroxide Fusion ICP
Tm2O3, Thulium(III) oxide (ppm) 0.93 0.049 0.86 1.00 Borate / Peroxide Fusion ICP
TREO, Total Rare Earth Oxides (ppm) 1930 73 1872 1988 Borate / Peroxide Fusion ICP
TREO+Y2O3, Total Rare Earth Oxides + Yttrium oxide (ppm) 2009 73 1948 2069 Borate / Peroxide Fusion ICP
U, Uranium (ppm) 4.13 0.178 3.98 4.28 Borate / Peroxide Fusion ICP
V, Vanadium (ppm) 184 17 173 195 Borate / Peroxide Fusion ICP
W, Tungsten (ppm) 5.19 0.486 4.62 5.77 Borate / Peroxide Fusion ICP
Y2O3, Yttrium(III) oxide (ppm) 81 3.6 77 84 Borate / Peroxide Fusion ICP
Yb2O3, Ytterbium(III) oxide (ppm) 5.67 0.270 5.38 5.96 Borate / Peroxide Fusion ICP
Zn, Zinc (ppm) 105 7 95 115 Borate / Peroxide Fusion ICP
Zr, Zirconium (ppm) 544 39 520 568 Borate / Peroxide Fusion ICP
Al2O3, Aluminium(III) oxide (wt.%) 24.19 0.386 23.85 24.53 Borate Fusion XRF
BaO, Barium oxide (wt.%) 0.494 0.030 0.468 0.521 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 0.461 0.015 0.448 0.473 Borate Fusion XRF
CeO2, Cerium(IV) oxide (ppm) 916 104 805 1027 Borate Fusion XRF
Dy2O3, Dysprosium(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.%) 10.84 0.207 10.67 11.00 Borate Fusion XRF
Gd2O3, Gadolinium(III) oxide (ppm) 76 66 23 129 Borate Fusion XRF
Ho2O3, Holmium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
K2O, Potassium oxide (wt.%) 3.12 0.048 3.08 3.16 Borate Fusion XRF
La2O3, Lanthanum(III) oxide (ppm) 473 47 431 516 Borate Fusion XRF
Lu2O3, Lutetium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 1.00 0.014 0.99 1.02 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.054 0.005 0.045 0.063 Borate Fusion XRF
Na2O, Sodium oxide (wt.%) 0.618 0.036 0.587 0.650 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.677 0.029 0.654 0.699 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 46.46 0.739 45.89 47.03 Borate Fusion XRF
Sm2O3, Samarium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
SO3, Sulphur trioxide (wt.%) 0.094 0.005 0.081 0.107 Borate Fusion XRF
Tb4O7, Terbium(III,IV) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 1.94 0.034 1.90 1.97 Borate Fusion XRF
Tm2O3, Thulium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
V2O5, Vanadium(V) oxide (ppm) 328 57 262 393 Borate Fusion XRF
Yb2O3, Ytterbium(III) oxide (ppm) < 100 IND IND IND Borate Fusion XRF
ZnO, Zinc oxide (ppm) 138 31 110 166 Borate Fusion XRF
ZrO2, Zirconium dioxide (ppm) 703 56 620 786 Borate Fusion XRF
LOI1000, Loss on ignition @1000 °C (wt.%) 8.81 0.566 8.48 9.14 Thermogravimetry
Al, Aluminium (wt.%) 12.28 0.473 11.92 12.64 4-Acid Digestion
Ba, Barium (wt.%) 0.446 0.011 0.435 0.458 4-Acid Digestion
Be, Beryllium (ppm) 3.25 0.232 3.08 3.43 4-Acid Digestion
Bi, Bismuth (ppm) 0.40 0.033 0.38 0.42 4-Acid Digestion
Ca, Calcium (wt.%) 0.331 0.018 0.318 0.343 4-Acid Digestion
Ce, Cerium (ppm) 734 51 700 769 4-Acid Digestion
Co, Cobalt (ppm) 14.0 0.66 13.4 14.6 4-Acid Digestion
Cr, Chromium (ppm) 57 4.1 54 59 4-Acid Digestion
Cs, Caesium (ppm) 9.46 0.459 8.96 9.95 4-Acid Digestion
Cu, Copper (ppm) 67 2.0 65 68 4-Acid Digestion
Dy, Dysprosium (ppm) 13.6 0.74 12.9 14.2 4-Acid Digestion
Er, Erbium (ppm) 6.11 0.413 5.78 6.43 4-Acid Digestion
Eu, Europium (ppm) 8.60 0.495 8.12 9.07 4-Acid Digestion
Fe, Iron (wt.%) 7.36 0.158 7.16 7.57 4-Acid Digestion
Ga, Gallium (ppm) 33.6 2.48 32.1 35.1 4-Acid Digestion
Gd, Gadolinium (ppm) 25.8 3.3 24.0 27.6 4-Acid Digestion
Hf, Hafnium (ppm) 6.06 0.574 5.66 6.47 4-Acid Digestion
Ho, Holmium (ppm) 2.29 0.149 2.17 2.41 4-Acid Digestion
In, Indium (ppm) 0.11 0.007 0.10 0.12 4-Acid Digestion
K, Potassium (wt.%) 2.54 0.092 2.45 2.62 4-Acid Digestion
La, Lanthanum (ppm) 338 39 313 363 4-Acid Digestion
Li, Lithium (ppm) 16.2 0.51 15.7 16.7 4-Acid Digestion
Lu, Lutetium (ppm) 0.66 0.062 0.62 0.71 4-Acid Digestion
Mg, Magnesium (wt.%) 0.554 0.041 0.527 0.580 4-Acid Digestion
Mn, Manganese (wt.%) 0.042 0.002 0.041 0.044 4-Acid Digestion
Mo, Molybdenum (ppm) 2.19 0.094 2.09 2.29 4-Acid Digestion
Na, Sodium (wt.%) 0.460 0.019 0.445 0.475 4-Acid Digestion
Nb, Niobium (ppm) 20.8 0.94 20.0 21.6 4-Acid Digestion
Nd, Neodymium (ppm) 289 27 270 309 4-Acid Digestion
Ni, Nickel (ppm) 37.5 1.22 36.3 38.8 4-Acid Digestion
P, Phosphorus (wt.%) 0.292 0.011 0.281 0.302 4-Acid Digestion
Pb, Lead (ppm) 51 2.0 49 53 4-Acid Digestion
Pr, Praseodymium (ppm) 84 6.8 78 89 4-Acid Digestion
Rb, Rubidium (ppm) 130 10 122 139 4-Acid Digestion
Re, Rhenium (ppm) < 0.002 IND IND IND 4-Acid Digestion
S, Sulphur (wt.%) 0.040 0.002 0.039 0.041 4-Acid Digestion
Sb, Antimony (ppm) 1.05 0.058 0.98 1.12 4-Acid Digestion
Sc, Scandium (ppm) 23.3 1.23 22.4 24.3 4-Acid Digestion
Sm, Samarium (ppm) 41.3 2.92 39.0 43.6 4-Acid Digestion
Sn, Tin (ppm) 4.79 0.194 4.56 5.01 4-Acid Digestion
Sr, Strontium (ppm) 748 31 722 775 4-Acid Digestion
Ta, Tantalum (ppm) 1.18 0.111 1.10 1.27 4-Acid Digestion
Tb, Terbium (ppm) 2.81 0.31 2.62 3.00 4-Acid Digestion
Th, Thorium (ppm) 33.2 3.25 31.2 35.2 4-Acid Digestion
Ti, Titanium (wt.%) 1.07 0.083 1.02 1.12 4-Acid Digestion
Tl, Thallium (ppm) 0.82 0.053 0.78 0.87 4-Acid Digestion
Tm, Thulium (ppm) 0.77 0.072 0.72 0.82 4-Acid Digestion
U, Uranium (ppm) 3.88 0.239 3.68 4.07 4-Acid Digestion
V, Vanadium (ppm) 177 8 171 183 4-Acid Digestion
W, Tungsten (ppm) 4.67 0.315 4.41 4.94 4-Acid Digestion
Y, Yttrium (ppm) 59 6 55 63 4-Acid Digestion
Yb, Ytterbium (ppm) 4.74 0.327 4.50 4.97 4-Acid Digestion
Zn, Zinc (ppm) 102 4 99 105 4-Acid Digestion
Zr, Zirconium (ppm) 255 22 241 269 4-Acid Digestion
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