OREAS 145

OREAS 145 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.%) 1.05 0.017 1.03 1.07 Borate Fusion XRF
Sn, Tin (wt.%) 1.01 0.038 0.97 1.05 Borate / Peroxide Fusion ICP
Cu, Copper (wt.%) 0.132 0.002 0.129 0.135 4-Acid Digestion
Al2O3, Aluminium(III) oxide (wt.%) 10.11 0.115 9.98 10.24 Borate Fusion XRF
As, Arsenic (wt.%) 0.441 0.020 0.419 0.464 Borate Fusion XRF
BaO, Barium oxide (ppm) 426 45 363 488 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 10.40 0.119 10.25 10.56 Borate Fusion XRF
Co, Cobalt (ppm) < 100 IND IND IND Borate Fusion XRF
Cu, Copper (wt.%) 0.129 0.005 0.122 0.136 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 13.64 0.339 13.40 13.89 Borate Fusion XRF
HfO2, Hafnium dioxide (ppm) < 100 IND IND IND Borate Fusion XRF
K2O, Potassium oxide (wt.%) 1.83 0.023 1.80 1.85 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 2.32 0.067 2.26 2.37 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.087 0.004 0.084 0.090 Borate Fusion XRF
Mo, Molybdenum (ppm) < 50 IND IND IND Borate Fusion XRF
Na2O, Sodium oxide (wt.%) 0.881 0.121 0.760 1.002 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.106 0.005 0.098 0.115 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 46.18 0.674 45.56 46.81 Borate Fusion XRF
SO3, Sulphur trioxide (wt.%) 11.47 0.243 11.27 11.67 Borate Fusion XRF
SrO, Strontium oxide (ppm) 124 12 99 149 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.464 0.016 0.446 0.482 Borate Fusion XRF
V2O5, Vanadium(V) oxide (ppm) 113 22 69 157 Borate Fusion XRF
Zn, Zinc (ppm) 76 13 56 96 Borate Fusion XRF
Al, Aluminium (wt.%) 5.35 0.130 5.16 5.53 Borate / Peroxide Fusion ICP
As, Arsenic (wt.%) 0.438 0.021 0.420 0.457 Borate / Peroxide Fusion ICP
Ba, Barium (ppm) 389 16 370 407 Borate / Peroxide Fusion ICP
Be, Beryllium (ppm) 4.45 0.68 2.82 6.08 Borate / Peroxide Fusion ICP
Ca, Calcium (wt.%) 7.55 0.214 7.14 7.96 Borate / Peroxide Fusion ICP
Ce, Cerium (ppm) 51 4.0 46 56 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 17.5 0.78 15.8 19.2 Borate / Peroxide Fusion ICP
Cr, Chromium (ppm) 64 10 48 79 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) 6.29 0.64 5.36 7.22 Borate / Peroxide Fusion ICP
Cu, Copper (wt.%) 0.133 0.003 0.129 0.138 Borate / Peroxide Fusion ICP
Dy, Dysprosium (ppm) 4.29 0.296 3.73 4.85 Borate / Peroxide Fusion ICP
Er, Erbium (ppm) 2.49 0.33 1.97 3.00 Borate / Peroxide Fusion ICP
Eu, Europium (ppm) 0.91 0.11 0.77 1.05 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 9.48 0.184 9.18 9.79 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 19.7 0.76 18.2 21.2 Borate / Peroxide Fusion ICP
Gd, Gadolinium (ppm) 4.35 0.64 3.47 5.24 Borate / Peroxide Fusion ICP
Ho, Holmium (ppm) 0.86 0.12 0.67 1.05 Borate / Peroxide Fusion ICP
K, Potassium (wt.%) 1.55 0.075 1.47 1.63 Borate / Peroxide Fusion ICP
La, Lanthanum (ppm) 24.9 2.12 22.2 27.5 Borate / Peroxide Fusion ICP
Li, Lithium (ppm) 87 5.9 77 96 Borate / Peroxide Fusion ICP
Mg, Magnesium (wt.%) 1.37 0.024 1.33 1.41 Borate / Peroxide Fusion ICP
Mn, Manganese (wt.%) 0.069 0.001 0.067 0.071 Borate / Peroxide Fusion ICP
Nd, Neodymium (ppm) 23.7 1.44 22.0 25.5 Borate / Peroxide Fusion ICP
Ni, Nickel (ppm) 24.9 6.3 19.1 30.7 Borate / Peroxide Fusion ICP
P, Phosphorus (wt.%) 0.047 0.003 0.041 0.054 Borate / Peroxide Fusion ICP
Pr, Praseodymium (ppm) 6.32 0.337 5.75 6.89 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 119 6 110 128 Borate / Peroxide Fusion ICP
S, Sulphur (wt.%) 4.45 0.074 4.34 4.57 Borate / Peroxide Fusion ICP
Si, Silicon (wt.%) 21.96 0.713 20.89 23.03 Borate / Peroxide Fusion ICP
Sm, Samarium (ppm) 4.77 0.66 3.85 5.69 Borate / Peroxide Fusion ICP
Sr, Strontium (ppm) 112 4 105 119 Borate / Peroxide Fusion ICP
Ta, Tantalum (ppm) 0.94 0.13 0.71 1.16 Borate / Peroxide Fusion ICP
Tb, Terbium (ppm) 0.68 0.13 0.51 0.84 Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 9.89 0.679 8.84 10.94 Borate / Peroxide Fusion ICP
Ti, Titanium (wt.%) 0.277 0.009 0.264 0.290 Borate / Peroxide Fusion ICP
Tm, Thulium (ppm) 0.35 0.06 0.26 0.44 Borate / Peroxide Fusion ICP
U, Uranium (ppm) 2.45 0.31 1.91 2.99 Borate / Peroxide Fusion ICP
Y, Yttrium (ppm) 22.7 2.23 20.0 25.3 Borate / Peroxide Fusion ICP
Yb, Ytterbium (ppm) 2.40 0.31 1.86 2.94 Borate / Peroxide Fusion ICP
Ag, Silver (ppm) 1.39 0.15 1.28 1.50 4-Acid Digestion
Al, Aluminium (wt.%) 5.10 0.242 4.91 5.30 4-Acid Digestion
As, Arsenic (wt.%) 0.441 0.012 0.430 0.451 4-Acid Digestion
Ba, Barium (ppm) 386 16 367 404 4-Acid Digestion
Be, Beryllium (ppm) 3.82 0.194 3.56 4.08 4-Acid Digestion
Bi, Bismuth (ppm) 82 3.5 78 87 4-Acid Digestion
Ca, Calcium (wt.%) 7.27 0.223 7.03 7.52 4-Acid Digestion
Ce, Cerium (ppm) 51 3.5 48 55 4-Acid Digestion
Co, Cobalt (ppm) 16.1 0.92 15.2 17.0 4-Acid Digestion
Cr, Chromium (ppm) 51 6 46 55 4-Acid Digestion
Cs, Caesium (ppm) 6.48 0.365 6.11 6.85 4-Acid Digestion
Dy, Dysprosium (ppm) 2.58 0.251 2.27 2.89 4-Acid Digestion
Er, Erbium (ppm) 1.31 0.19 1.11 1.50 4-Acid Digestion
Eu, Europium (ppm) 0.84 0.068 0.74 0.95 4-Acid Digestion
Fe, Iron (wt.%) 9.43 0.139 9.21 9.65 4-Acid Digestion
Ga, Gallium (ppm) 19.2 0.86 18.4 20.0 4-Acid Digestion
Gd, Gadolinium (ppm) 3.58 0.41 3.10 4.06 4-Acid Digestion
Hf, Hafnium (ppm) 2.31 0.172 2.16 2.47 4-Acid Digestion
Ho, Holmium (ppm) 0.47 0.06 0.41 0.53 4-Acid Digestion
In, Indium (ppm) 3.37 0.331 3.00 3.74 4-Acid Digestion
K, Potassium (wt.%) 1.52 0.036 1.48 1.56 4-Acid Digestion
La, Lanthanum (ppm) 25.1 1.77 23.5 26.8 4-Acid Digestion
Li, Lithium (ppm) 86 7.5 81 91 4-Acid Digestion
Lu, Lutetium (ppm) 0.19 0.04 0.16 0.23 4-Acid Digestion
Mg, Magnesium (wt.%) 1.27 0.044 1.23 1.31 4-Acid Digestion
Mn, Manganese (wt.%) 0.065 0.003 0.063 0.068 4-Acid Digestion
Mo, Molybdenum (ppm) 3.11 0.252 2.85 3.37 4-Acid Digestion
Na, Sodium (wt.%) 0.693 0.037 0.667 0.720 4-Acid Digestion
Nb, Niobium (ppm) 9.64 1.51 8.55 10.73 4-Acid Digestion
Nd, Neodymium (ppm) 22.4 1.89 20.2 24.7 4-Acid Digestion
Ni, Nickel (ppm) 24.7 1.18 23.4 26.0 4-Acid Digestion
P, Phosphorus (wt.%) 0.047 0.002 0.045 0.049 4-Acid Digestion
Pb, Lead (ppm) 22.1 1.72 20.3 23.9 4-Acid Digestion
Pr, Praseodymium (ppm) 6.34 0.222 5.83 6.86 4-Acid Digestion
Rb, Rubidium (ppm) 113 8 107 119 4-Acid Digestion
S, Sulphur (wt.%) 4.45 0.047 4.36 4.54 4-Acid Digestion
Sb, Antimony (ppm) 3.99 0.66 3.54 4.45 4-Acid Digestion
Sc, Scandium (ppm) 8.51 0.393 8.07 8.95 4-Acid Digestion
Sm, Samarium (ppm) 4.46 0.325 4.05 4.87 4-Acid Digestion
Sr, Strontium (ppm) 111 5 107 115 4-Acid Digestion
Ta, Tantalum (ppm) 0.74 0.12 0.64 0.84 4-Acid Digestion
Tb, Terbium (ppm) 0.48 0.024 0.43 0.52 4-Acid Digestion
Th, Thorium (ppm) 9.64 0.619 8.91 10.37 4-Acid Digestion
Ti, Titanium (wt.%) 0.239 0.019 0.227 0.251 4-Acid Digestion
Tl, Thallium (ppm) 0.57 0.030 0.54 0.60 4-Acid Digestion
Tm, Thulium (ppm) 0.17 0.03 0.10 0.24 4-Acid Digestion
U, Uranium (ppm) 2.26 0.181 2.01 2.51 4-Acid Digestion
V, Vanadium (ppm) 56 2.5 54 58 4-Acid Digestion
W, Tungsten (ppm) 59 2.9 55 63 4-Acid Digestion
Y, Yttrium (ppm) 12.3 1.16 11.5 13.1 4-Acid Digestion
Yb, Ytterbium (ppm) 1.29 0.20 1.11 1.48 4-Acid Digestion
Zn, Zinc (ppm) 70 5.4 66 74 4-Acid Digestion
Zr, Zirconium (ppm) 77 9 69 84 4-Acid Digestion
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