OREAS 144

OREAS 144 is a certified reference material (CRM) produced from a blend of tin-copper sulphide ores, hornfels, granodiorite, and calcium carbonate. The ores were sourced from the Renison Bell tin deposit in western Tasmania, Australia. Mineralisation is structurally controlled, with cassiterite hosted in silica- and tourmaline-altered veins within carbonate-rich metasedimentary rocks of the Mount Read Volcanics. The deposit is genetically linked to Devonian granite intrusions. Cassiterite (SnO₂) is the dominant tin-bearing mineral, accompanied by sulphide phases such as pyrrhotite, arsenopyrite, chalcopyrite, and stannite.

Eighteen 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
  • Lithium borate or sodium peroxide fusion with full suite ICP-OES and ICP-MS elemental packages
  • 4-acid (HNO3-HF-HClO4-HCl) digestion with full suite ICP-OES and ICP-MS elemental packages

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
Sn, Tin (wt.%) 0.607 0.014 0.586 0.628 Borate Fusion XRF
Sn, Tin (wt.%) 0.570 0.043 0.540 0.601 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 769 20 748 789 4-Acid Digestion
Al2O3, Aluminium(III) oxide (wt.%) 11.13 0.160 10.97 11.28 Borate Fusion XRF
As, Arsenic (wt.%) 0.254 0.023 0.233 0.275 Borate Fusion XRF
BaO, Barium oxide (ppm) 584 39 517 652 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 10.89 0.127 10.74 11.05 Borate Fusion XRF
Co, Cobalt (ppm) < 100 IND IND IND Borate Fusion XRF
Cu, Copper (ppm) 745 28 697 792 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 9.63 0.159 9.49 9.77 Borate Fusion XRF
HfO2, Hafnium dioxide (ppm) < 100 IND IND IND Borate Fusion XRF
K2O, Potassium oxide (wt.%) 2.33 0.030 2.29 2.37 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 2.09 0.036 2.05 2.12 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.064 0.004 0.061 0.067 Borate Fusion XRF
Mo, Molybdenum (ppm) < 50 IND IND IND Borate Fusion XRF
Na2O, Sodium oxide (wt.%) 1.07 0.11 0.96 1.18 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.117 0.007 0.108 0.126 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 49.93 0.766 49.28 50.58 Borate Fusion XRF
SO3, Sulphur trioxide (wt.%) 6.67 0.147 6.49 6.85 Borate Fusion XRF
SrO, Strontium oxide (ppm) 125 28 102 147 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.512 0.014 0.498 0.527 Borate Fusion XRF
V2O5, Vanadium(V) oxide (ppm) 127 25 79 175 Borate Fusion XRF
Zn, Zinc (ppm) 80 22 59 101 Borate Fusion XRF
LOI1000, Loss on ignition @1000 °C (wt.%) 6.48 1.06 5.82 7.13 Thermogravimetry
Al, Aluminium (wt.%) 5.88 0.156 5.72 6.03 Borate / Peroxide Fusion ICP
As, Arsenic (wt.%) 0.251 0.016 0.237 0.265 Borate / Peroxide Fusion ICP
Ba, Barium (ppm) 528 16 505 551 Borate / Peroxide Fusion ICP
Be, Beryllium (ppm) 3.31 0.85 2.14 4.48 Borate / Peroxide Fusion ICP
Ca, Calcium (wt.%) 7.83 0.270 7.44 8.21 Borate / Peroxide Fusion ICP
Ce, Cerium (ppm) 57 5.3 50 64 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 14.5 0.57 13.3 15.6 Borate / Peroxide Fusion ICP
Cr, Chromium (ppm) 69 8 55 83 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) 7.53 0.637 6.62 8.44 Borate / Peroxide Fusion ICP
Cu, Copper (ppm) 771 22 742 800 Borate / Peroxide Fusion ICP
Dy, Dysprosium (ppm) 4.54 0.352 3.86 5.22 Borate / Peroxide Fusion ICP
Er, Erbium (ppm) 2.62 0.30 2.14 3.10 Borate / Peroxide Fusion ICP
Eu, Europium (ppm) 1.10 0.077 0.93 1.26 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 6.78 0.157 6.57 6.98 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 18.6 0.52 17.5 19.6 Borate / Peroxide Fusion ICP
Gd, Gadolinium (ppm) 4.89 0.57 4.02 5.77 Borate / Peroxide Fusion ICP
Ho, Holmium (ppm) 0.91 0.11 0.73 1.10 Borate / Peroxide Fusion ICP
K, Potassium (wt.%) 1.99 0.039 1.91 2.07 Borate / Peroxide Fusion ICP
La, Lanthanum (ppm) 27.7 2.9 24.1 31.3 Borate / Peroxide Fusion ICP
Li, Lithium (ppm) 66 11 54 77 Borate / Peroxide Fusion ICP
Mg, Magnesium (wt.%) 1.23 0.028 1.19 1.27 Borate / Peroxide Fusion ICP
Mn, Manganese (wt.%) 0.053 0.002 0.051 0.055 Borate / Peroxide Fusion ICP
Nd, Neodymium (ppm) 27.5 1.77 25.0 30.0 Borate / Peroxide Fusion ICP
Ni, Nickel (ppm) 31.0 6.1 19.8 42.3 Borate / Peroxide Fusion ICP
P, Phosphorus (wt.%) 0.051 0.002 0.049 0.053 Borate / Peroxide Fusion ICP
Pr, Praseodymium (ppm) 6.88 0.82 5.70 8.05 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 127 8 112 143 Borate / Peroxide Fusion ICP
S, Sulphur (wt.%) 2.62 0.037 2.55 2.68 Borate / Peroxide Fusion ICP
Si, Silicon (wt.%) 23.65 0.811 22.78 24.52 Borate / Peroxide Fusion ICP
Sm, Samarium (ppm) 5.23 0.57 4.40 6.06 Borate / Peroxide Fusion ICP
Sr, Strontium (ppm) 125 6 117 133 Borate / Peroxide Fusion ICP
Ta, Tantalum (ppm) 0.98 0.12 0.74 1.22 Borate / Peroxide Fusion ICP
Tb, Terbium (ppm) 0.77 0.08 0.66 0.88 Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 11.4 0.66 10.3 12.4 Borate / Peroxide Fusion ICP
Ti, Titanium (wt.%) 0.302 0.007 0.293 0.311 Borate / Peroxide Fusion ICP
Tm, Thulium (ppm) 0.37 0.05 0.27 0.46 Borate / Peroxide Fusion ICP
U, Uranium (ppm) 2.76 0.36 2.37 3.15 Borate / Peroxide Fusion ICP
V, Vanadium (ppm) 62 10 48 76 Borate / Peroxide Fusion ICP
Y, Yttrium (ppm) 23.7 3.0 20.3 27.0 Borate / Peroxide Fusion ICP
Yb, Ytterbium (ppm) 2.43 0.29 1.95 2.90 Borate / Peroxide Fusion ICP
Zn, Zinc (ppm) 81 20 65 97 Borate / Peroxide Fusion ICP
Ag, Silver (ppm) 0.838 0.030 0.777 0.898 4-Acid Digestion
Al, Aluminium (wt.%) 5.72 0.200 5.52 5.91 4-Acid Digestion
As, Arsenic (wt.%) 0.255 0.008 0.248 0.263 4-Acid Digestion
Ba, Barium (ppm) 534 14 519 549 4-Acid Digestion
Be, Beryllium (ppm) 3.13 0.107 2.99 3.28 4-Acid Digestion
Bi, Bismuth (ppm) 45.3 2.27 42.8 47.9 4-Acid Digestion
Ca, Calcium (wt.%) 7.64 0.322 7.35 7.92 4-Acid Digestion
Ce, Cerium (ppm) 59 2.9 55 63 4-Acid Digestion
Co, Cobalt (ppm) 13.5 0.85 12.4 14.6 4-Acid Digestion
Cr, Chromium (ppm) 55 6 50 61 4-Acid Digestion
Cs, Caesium (ppm) 7.80 0.449 7.31 8.28 4-Acid Digestion
Dy, Dysprosium (ppm) 2.84 0.29 2.52 3.15 4-Acid Digestion
Er, Erbium (ppm) 1.35 0.21 1.14 1.56 4-Acid Digestion
Eu, Europium (ppm) 1.00 0.061 0.91 1.09 4-Acid Digestion
Fe, Iron (wt.%) 6.67 0.111 6.50 6.85 4-Acid Digestion
Ga, Gallium (ppm) 18.3 1.03 17.2 19.4 4-Acid Digestion
Gd, Gadolinium (ppm) 4.11 0.42 3.62 4.60 4-Acid Digestion
Hf, Hafnium (ppm) 2.44 0.234 2.23 2.65 4-Acid Digestion
Ho, Holmium (ppm) 0.50 0.07 0.43 0.58 4-Acid Digestion
In, Indium (ppm) 2.00 0.28 1.66 2.34 4-Acid Digestion
K, Potassium (wt.%) 1.94 0.059 1.89 2.00 4-Acid Digestion
La, Lanthanum (ppm) 29.1 1.75 27.1 31.1 4-Acid Digestion
Li, Lithium (ppm) 71 4.2 67 74 4-Acid Digestion
Lu, Lutetium (ppm) 0.18 0.017 0.16 0.21 4-Acid Digestion
Mg, Magnesium (wt.%) 1.16 0.036 1.12 1.19 4-Acid Digestion
Mn, Manganese (wt.%) 0.050 0.002 0.048 0.052 4-Acid Digestion
Mo, Molybdenum (ppm) 2.08 0.147 1.89 2.27 4-Acid Digestion
Na, Sodium (wt.%) 0.836 0.028 0.805 0.867 4-Acid Digestion
Nb, Niobium (ppm) 10.2 1.3 9.2 11.3 4-Acid Digestion
Nd, Neodymium (ppm) 25.5 2.29 22.5 28.4 4-Acid Digestion
Ni, Nickel (ppm) 28.1 1.90 26.3 29.9 4-Acid Digestion
P, Phosphorus (wt.%) 0.052 0.001 0.050 0.055 4-Acid Digestion
Pb, Lead (ppm) 20.6 1.79 19.3 21.9 4-Acid Digestion
Pr, Praseodymium (ppm) 7.20 0.483 6.64 7.76 4-Acid Digestion
Rb, Rubidium (ppm) 126 7 118 135 4-Acid Digestion
S, Sulphur (wt.%) 2.62 0.049 2.55 2.68 4-Acid Digestion
Sb, Antimony (ppm) 2.50 0.32 2.17 2.82 4-Acid Digestion
Sc, Scandium (ppm) 9.13 0.604 8.57 9.70 4-Acid Digestion
Sm, Samarium (ppm) 5.06 0.316 4.55 5.56 4-Acid Digestion
Sr, Strontium (ppm) 124 5 119 130 4-Acid Digestion
Ta, Tantalum (ppm) 0.84 0.13 0.74 0.93 4-Acid Digestion
Tb, Terbium (ppm) 0.54 0.045 0.49 0.59 4-Acid Digestion
Th, Thorium (ppm) 11.3 0.40 10.6 11.9 4-Acid Digestion
Ti, Titanium (wt.%) 0.279 0.017 0.268 0.291 4-Acid Digestion
Tl, Thallium (ppm) 0.67 0.029 0.64 0.71 4-Acid Digestion
Tm, Thulium (ppm) 0.17 0.03 0.14 0.20 4-Acid Digestion
U, Uranium (ppm) 2.55 0.228 2.24 2.86 4-Acid Digestion
V, Vanadium (ppm) 63 2.4 61 65 4-Acid Digestion
W, Tungsten (ppm) 35.6 1.83 33.1 38.1 4-Acid Digestion
Y, Yttrium (ppm) 12.8 1.3 11.8 13.8 4-Acid Digestion
Yb, Ytterbium (ppm) 1.19 0.16 1.00 1.37 4-Acid Digestion
Zn, Zinc (ppm) 72 4.5 68 76 4-Acid Digestion
Zr, Zirconium (ppm) 79 10 70 89 4-Acid Digestion
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