OREAS 780

OREAS 780 was prepared from a blend of fluorite-bearing materials and barren siliceous waste rock. The fluorine-bearing component was sourced from the Speewah region, Western Australia, where fluorite mineralisation occurs within iron-rich lithologies. Fluorine is present predominantly as fluorite (CaF₂), accompanied by minor iron oxides and silicate gangue minerals. The barren waste rock was sourced from Victoria, Australia and is composed predominantly of quartz and muscovite/sericite, with minor vermiculite, phlogopite, plagioclase, K-feldspar and tourmaline. The material is also anomalous in As, Au, Bi, La, Sb, W and Sn.

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

  • Lithium borate fusion whole rock analysis package by X-ray fluorescence
  • Thermogravimetry: Loss on Ignition (LOI) at 1000 °C 
  • F by ion selective electrode
  • 4-Acid – Full ICP-OES and MS elemental suites

Homogeneity was evaluated using 12 subsamples analysed by oxidising fusion with X-ray fluorescence 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
Al2O3, Aluminium(III) oxide (wt.%) 13.61 0.151 13.46 13.76 Oxidising Fusion XRF
As, Arsenic (ppm) 444 102 361 527 Oxidising Fusion XRF
BaO, Barium oxide (ppm) 997 56 909 1086 Oxidising Fusion XRF
Ca, Calcium (wt.%) 5.67 0.086 5.57 5.77 Oxidising Fusion XRF
Co, Cobalt (ppm) < 100 IND IND IND Oxidising Fusion XRF
Cr, Chromium (ppm) 114 23 73 155 Oxidising Fusion XRF
Cu, Copper (ppm) 57 12 40 75 Oxidising Fusion XRF
F, Fluorine (wt.%) 5.15 0.170 4.94 5.36 Oxidising Fusion XRF
Fe, Iron (wt.%) 2.50 0.052 2.46 2.53 Oxidising Fusion XRF
HfO2, Hafnium dioxide (ppm) < 100 IND IND IND Oxidising Fusion XRF
K2O, Potassium oxide (wt.%) 2.61 0.068 2.57 2.65 Oxidising Fusion XRF
MgO, Magnesium oxide (wt.%) 0.546 0.034 0.522 0.569 Oxidising Fusion XRF
Nb, Niobium (ppm) < 50 IND IND IND Oxidising Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.063 0.007 0.055 0.072 Oxidising Fusion XRF
Pb, Lead (ppm) < 50 IND IND IND Oxidising Fusion XRF
S, Sulphur (ppm) 97 23 82 112 Oxidising Fusion XRF
SiO2, Silicon dioxide (wt.%) 63.83 0.614 63.35 64.31 Oxidising Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.688 0.028 0.667 0.708 Oxidising Fusion XRF
W, Tungsten (ppm) 81 14 59 104 Oxidising Fusion XRF
Zr, Zirconium (ppm) 200 35 134 267 Oxidising Fusion XRF
LOI1000, Loss on ignition @1000 °C (wt.%) 5.76 0.474 5.45 6.07 Thermogravimetry
F, Fluorine (wt.%) 4.32 0.52 3.94 4.69 Ion Selective Electrode
Ag, Silver (ppm) 0.345 0.024 0.302 0.387 4-Acid Digestion
Al, Aluminium (wt.%) 6.73 0.350 6.47 6.99 4-Acid Digestion
As, Arsenic (ppm) 428 13 413 443 4-Acid Digestion
Ba, Barium (ppm) 878 27 850 906 4-Acid Digestion
Be, Beryllium (ppm) 2.60 0.138 2.48 2.73 4-Acid Digestion
Bi, Bismuth (ppm) 116 5 111 121 4-Acid Digestion
Ca, Calcium (wt.%) 5.59 0.162 5.41 5.77 4-Acid Digestion
Ce, Cerium (ppm) 88 4.3 82 93 4-Acid Digestion
Co, Cobalt (ppm) 1.82 0.121 1.70 1.94 4-Acid Digestion
Cr, Chromium (ppm) 88 13 80 96 4-Acid Digestion
Cs, Caesium (ppm) 9.71 0.498 9.26 10.17 4-Acid Digestion
Cu, Copper (ppm) 52 2.4 50 55 4-Acid Digestion
Dy, Dysprosium (ppm) 3.40 0.331 3.04 3.76 4-Acid Digestion
Er, Erbium (ppm) 1.63 0.22 1.40 1.86 4-Acid Digestion
Eu, Europium (ppm) 1.20 0.048 1.12 1.28 4-Acid Digestion
Fe, Iron (wt.%) 2.42 0.082 2.34 2.50 4-Acid Digestion
Ga, Gallium (ppm) 17.9 1.00 17.0 18.7 4-Acid Digestion
Gd, Gadolinium (ppm) 4.88 0.348 4.41 5.36 4-Acid Digestion
Hf, Hafnium (ppm) 3.70 0.295 3.47 3.93 4-Acid Digestion
Ho, Holmium (ppm) 0.59 0.09 0.50 0.68 4-Acid Digestion
In, Indium (ppm) 0.082 0.008 0.072 0.091 4-Acid Digestion
K, Potassium (wt.%) 2.20 0.056 2.13 2.26 4-Acid Digestion
La, Lanthanum (ppm) 43.7 1.96 41.3 46.1 4-Acid Digestion
Li, Lithium (ppm) 45.3 1.46 43.6 47.0 4-Acid Digestion
Lu, Lutetium (ppm) 0.23 0.04 0.19 0.27 4-Acid Digestion
Mg, Magnesium (wt.%) 0.265 0.034 0.245 0.286 4-Acid Digestion
Mn, Manganese (wt.%) 0.004 0.000 0.004 0.004 4-Acid Digestion
Mo, Molybdenum (ppm) 3.76 0.297 3.38 4.15 4-Acid Digestion
Na, Sodium (wt.%) 0.136 0.009 0.128 0.145 4-Acid Digestion
Nb, Niobium (ppm) 11.7 1.04 10.8 12.5 4-Acid Digestion
Nd, Neodymium (ppm) 35.7 1.65 33.5 37.9 4-Acid Digestion
Ni, Nickel (ppm) 12.8 0.65 12.1 13.5 4-Acid Digestion
P, Phosphorus (wt.%) 0.028 0.001 0.027 0.029 4-Acid Digestion
Pb, Lead (ppm) 16.6 1.27 15.8 17.5 4-Acid Digestion
Pr, Praseodymium (ppm) 9.82 0.445 9.15 10.49 4-Acid Digestion
Rb, Rubidium (ppm) 122 8 114 129 4-Acid Digestion
S, Sulphur (wt.%) 0.012 0.003 0.011 0.013 4-Acid Digestion
Sb, Antimony (ppm) 5.58 0.418 5.26 5.90 4-Acid Digestion
Sc, Scandium (ppm) 13.3 0.76 12.6 14.1 4-Acid Digestion
Se, Selenium (ppm) 0.92 0.15 0.74 1.10 4-Acid Digestion
Sm, Samarium (ppm) 6.25 0.232 5.81 6.68 4-Acid Digestion
Sn, Tin (ppm) 14.8 0.69 14.1 15.6 4-Acid Digestion
Sr, Strontium (ppm) 63 2.4 60 66 4-Acid Digestion
Ta, Tantalum (ppm) 0.89 0.09 0.81 0.97 4-Acid Digestion
Tb, Terbium (ppm) 0.66 0.09 0.57 0.76 4-Acid Digestion
Te, Tellurium (ppm) 0.23 0.03 0.20 0.27 4-Acid Digestion
Th, Thorium (ppm) 15.3 0.69 14.4 16.1 4-Acid Digestion
Ti, Titanium (wt.%) 0.347 0.045 0.319 0.374 4-Acid Digestion
Tl, Thallium (ppm) 0.69 0.051 0.65 0.73 4-Acid Digestion
Tm, Thulium (ppm) 0.22 0.04 0.18 0.26 4-Acid Digestion
U, Uranium (ppm) 2.49 0.153 2.31 2.67 4-Acid Digestion
V, Vanadium (ppm) 91 4.1 87 95 4-Acid Digestion
W, Tungsten (ppm) 75 2.9 72 79 4-Acid Digestion
Y, Yttrium (ppm) 25.0 1.78 23.1 27.0 4-Acid Digestion
Yb, Ytterbium (ppm) 1.62 0.19 1.44 1.79 4-Acid Digestion
Zn, Zinc (ppm) 29.0 2.16 27.1 30.9 4-Acid Digestion
Zr, Zirconium (ppm) 130 7 124 136 4-Acid Digestion
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