OREAS 24b

Reference material OREAS 24b has been prepared from barren I-Type hornblende-bearing granodiorite sourced from the Late Devonian Lysterfield granodiorite complex located in the Melbourne province of Australia. Ten commercial analytical laboratories participated in the program to characterise the elements reported in Tables 1 to 6 (please download certificate). The elements listed below are only a subset of the certified values.

The following methods were employed:

  • Lithium borate fusion for full suite X-ray fluorescence (9 laboratories)
  • Sodium peroxide fusion or lithium borate fusion for full suite ICP-OES and ICP-MS (10 laboratories)
  • Four acid digestion for full suite ICP-OES and ICP-MS (9 laboratories)
  • Aqua regia digestion for full suite ICP-OES and ICP-MS (9 laboratories)
  • Fire assay with ICP-OES and ICP-MS for Au, Pd and Pt (9 laboratories)
  • Infra-red combustion furnace for C and S (9 laboratories)
  • Thermogravimetry for LOI (10 laboratories)
Analyte Certified Value 1SD 95% Confidence Limits Low 95% Confidence Limits High Method
Au, Gold (ppb) < 3 IND IND IND Pb Fire Assay
Cu, Copper (ppm) 38.0 1.59 36.9 39.0 4-Acid Digestion
Pb, Lead (ppm) 23.1 1.38 22.1 24.2 4-Acid Digestion
Al2O3, Aluminium(III) oxide (wt.%) 15.15 0.094 15.09 15.20 Borate Fusion XRF
BaO, Barium oxide (ppm) 819 45 780 859 Borate Fusion XRF
CaO, Calcium oxide (wt.%) 1.47 0.023 1.46 1.49 Borate Fusion XRF
Cr2O3, Chromium(III) oxide (ppm) 201 7 199 203 Borate Fusion XRF
Fe2O3, Iron(III) oxide (wt.%) 6.35 0.058 6.31 6.39 Borate Fusion XRF
K2O, Potassium oxide (wt.%) 3.39 0.026 3.37 3.41 Borate Fusion XRF
MgO, Magnesium oxide (wt.%) 2.75 0.029 2.73 2.78 Borate Fusion XRF
MnO, Manganese oxide (wt.%) 0.059 0.002 0.057 0.061 Borate Fusion XRF
Na2O, Sodium oxide (wt.%) 1.15 0.024 1.13 1.17 Borate Fusion XRF
P2O5, Phosphorus(V) oxide (wt.%) 0.161 0.005 0.156 0.166 Borate Fusion XRF
SiO2, Silicon dioxide (wt.%) 66.00 0.263 65.85 66.15 Borate Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.798 0.019 0.784 0.812 Borate Fusion XRF
LOI1000, Loss On Ignition @1000°C (wt.%) 2.46 0.169 2.34 2.59 Thermogravimetry
Al, Aluminium (wt.%) 7.81 0.180 7.73 7.89 Borate / Peroxide Fusion ICP
Ba, Barium (ppm) 739 29 719 759 Borate / Peroxide Fusion ICP
Be, Beryllium (ppm) 2.95 0.37 2.82 3.07 Borate / Peroxide Fusion ICP
Ca, Calcium (wt.%) 1.06 0.041 1.03 1.08 Borate / Peroxide Fusion ICP
Ce, Cerium (ppm) 86 2.5 84 87 Borate / Peroxide Fusion ICP
Co, Cobalt (ppm) 16.9 0.83 16.3 17.6 Borate / Peroxide Fusion ICP
Cr, Chromium (ppm) 142 13 133 151 Borate / Peroxide Fusion ICP
Cs, Caesium (ppm) 10.5 0.43 10.2 10.8 Borate / Peroxide Fusion ICP
Dy, Dysprosium (ppm) 5.83 0.250 5.71 5.96 Borate / Peroxide Fusion ICP
Er, Erbium (ppm) 3.41 0.130 3.35 3.48 Borate / Peroxide Fusion ICP
Eu, Europium (ppm) 1.39 0.086 1.35 1.44 Borate / Peroxide Fusion ICP
Fe, Iron (wt.%) 4.45 0.124 4.39 4.52 Borate / Peroxide Fusion ICP
Ga, Gallium (ppm) 20.2 0.87 19.6 20.8 Borate / Peroxide Fusion ICP
Gd, Gadolinium (ppm) 6.27 0.374 5.97 6.56 Borate / Peroxide Fusion ICP
Hf, Hafnium (ppm) 6.15 0.461 5.84 6.45 Borate / Peroxide Fusion ICP
Ho, Holmium (ppm) 1.17 0.063 1.14 1.21 Borate / Peroxide Fusion ICP
K, Potassium (wt.%) 2.74 0.051 2.72 2.76 Borate / Peroxide Fusion ICP
La, Lanthanum (ppm) 44.0 1.54 43.1 44.9 Borate / Peroxide Fusion ICP
Li, Lithium (ppm) 52 3.2 48 56 Borate / Peroxide Fusion ICP
Lu, Lutetium (ppm) 0.49 0.045 0.45 0.52 Borate / Peroxide Fusion ICP
Mg, Magnesium (wt.%) 1.62 0.043 1.59 1.64 Borate / Peroxide Fusion ICP
Mn, Manganese (wt.%) 0.046 0.000 0.046 0.047 Borate / Peroxide Fusion ICP
Na, Sodium (wt.%) 0.824 0.022 0.795 0.852 Borate / Peroxide Fusion ICP
Nb, Niobium (ppm) 16.0 0.65 15.5 16.5 Borate / Peroxide Fusion ICP
Nd, Neodymium (ppm) 38.7 0.79 38.2 39.2 Borate / Peroxide Fusion ICP
Ni, Nickel (ppm) 61 7 57 66 Borate / Peroxide Fusion ICP
Pr, Praseodymium (ppm) 10.2 0.37 9.9 10.4 Borate / Peroxide Fusion ICP
Rb, Rubidium (ppm) 161 3 158 164 Borate / Peroxide Fusion ICP
S, Sulphur (wt.%) 0.203 0.034 0.167 0.240 Borate / Peroxide Fusion ICP
Sc, Scandium (ppm) 14.1 0.71 13.2 15.0 Borate / Peroxide Fusion ICP
Si, Silicon (wt.%) 31.12 1.055 30.35 31.89 Borate / Peroxide Fusion ICP
Sm, Samarium (ppm) 7.17 0.283 7.03 7.32 Borate / Peroxide Fusion ICP
Sn, Tin (ppm) 4.65 0.68 4.18 5.12 Borate / Peroxide Fusion ICP
Sr, Strontium (ppm) 125 4 122 127 Borate / Peroxide Fusion ICP
Ta, Tantalum (ppm) 1.32 0.083 1.27 1.37 Borate / Peroxide Fusion ICP
Tb, Terbium (ppm) 0.98 0.045 0.95 1.01 Borate / Peroxide Fusion ICP
Th, Thorium (ppm) 16.5 0.65 16.1 16.9 Borate / Peroxide Fusion ICP
Ti, Titanium (wt.%) 0.481 0.017 0.471 0.491 Borate / Peroxide Fusion ICP
Tl, Thallium (ppm) 0.91 0.10 0.81 1.00 Borate / Peroxide Fusion ICP
Tm, Thulium (ppm) 0.50 0.029 0.48 0.52 Borate / Peroxide Fusion ICP
U, Uranium (ppm) 3.31 0.136 3.23 3.40 Borate / Peroxide Fusion ICP
V, Vanadium (ppm) 112 10 105 119 Borate / Peroxide Fusion ICP
W, Tungsten (ppm) 4.13 0.52 3.82 4.45 Borate / Peroxide Fusion ICP
Y, Yttrium (ppm) 32.5 1.53 31.5 33.5 Borate / Peroxide Fusion ICP
Yb, Ytterbium (ppm) 3.24 0.135 3.17 3.31 Borate / Peroxide Fusion ICP
Zr, Zirconium (ppm) 213 11 206 221 Borate / Peroxide Fusion ICP
Al, Aluminium (wt.%) 8.02 0.484 7.55 8.48 4-Acid Digestion
Ba, Barium (ppm) 716 33 690 742 4-Acid Digestion
Be, Beryllium (ppm) 2.92 0.47 2.53 3.32 4-Acid Digestion
Bi, Bismuth (ppm) 0.68 0.063 0.64 0.72 4-Acid Digestion
Ca, Calcium (wt.%) 1.08 0.040 1.04 1.12 4-Acid Digestion
Ce, Cerium (ppm) 84 3.5 81 87 4-Acid Digestion
Co, Cobalt (ppm) 16.9 1.19 16.3 17.4 4-Acid Digestion
Cr, Chromium (ppm) 118 10 109 127 4-Acid Digestion
Cs, Caesium (ppm) 10.7 0.41 10.3 11.1 4-Acid Digestion
Fe, Iron (wt.%) 4.39 0.131 4.27 4.52 4-Acid Digestion
Ga, Gallium (ppm) 20.1 0.82 19.5 20.7 4-Acid Digestion
Hf, Hafnium (ppm) 3.90 0.54 3.44 4.37 4-Acid Digestion
K, Potassium (wt.%) 2.81 0.110 2.72 2.89 4-Acid Digestion
La, Lanthanum (ppm) 42.4 2.34 40.4 44.3 4-Acid Digestion
Li, Lithium (ppm) 52 1.2 51 52 4-Acid Digestion
Mg, Magnesium (wt.%) 1.65 0.054 1.59 1.70 4-Acid Digestion
Mn, Manganese (wt.%) 0.044 0.002 0.043 0.046 4-Acid Digestion
Mo, Molybdenum (ppm) 4.03 0.357 3.73 4.34 4-Acid Digestion
Na, Sodium (wt.%) 0.846 0.025 0.825 0.866 4-Acid Digestion
Nb, Niobium (ppm) 14.6 1.29 13.4 15.8 4-Acid Digestion
Ni, Nickel (ppm) 60 4.1 57 64 4-Acid Digestion
P, Phosphorus (wt.%) 0.069 0.005 0.065 0.074 4-Acid Digestion
Rb, Rubidium (ppm) 164 9 156 171 4-Acid Digestion
S, Sulphur (wt.%) 0.198 0.008 0.191 0.206 4-Acid Digestion
Sb, Antimony (ppm) 1.00 0.045 0.97 1.02 4-Acid Digestion
Sc, Scandium (ppm) 15.3 1.43 14.1 16.4 4-Acid Digestion
Sn, Tin (ppm) 4.25 0.221 4.06 4.45 4-Acid Digestion
Sr, Strontium (ppm) 124 11 115 133 4-Acid Digestion
Ta, Tantalum (ppm) 1.23 0.22 1.02 1.43 4-Acid Digestion
Th, Thorium (ppm) 16.4 1.11 15.5 17.3 4-Acid Digestion
Ti, Titanium (wt.%) 0.468 0.018 0.447 0.490 4-Acid Digestion
Tl, Thallium (ppm) 0.86 0.043 0.81 0.91 4-Acid Digestion
U, Uranium (ppm) 3.06 0.093 2.98 3.13 4-Acid Digestion
V, Vanadium (ppm) 108 4 104 112 4-Acid Digestion
W, Tungsten (ppm) 3.64 0.47 3.27 4.01 4-Acid Digestion
Y, Yttrium (ppm) 19.9 2.0 17.9 21.8 4-Acid Digestion
Zn, Zinc (ppm) 105 6 100 109 4-Acid Digestion
Zr, Zirconium (ppm) 134 24 113 156 4-Acid Digestion
Al, Aluminium (wt.%) 3.15 0.151 3.02 3.29 Aqua Regia Digestion (sample weights 0.15-50g)
As, Arsenic (ppm) 7.96 0.740 7.64 8.27 Aqua Regia Digestion (sample weights 0.15-50g)
Ba, Barium (ppm) 146 6 140 152 Aqua Regia Digestion (sample weights 0.15-50g)
Bi, Bismuth (ppm) 0.73 0.071 0.68 0.79 Aqua Regia Digestion (sample weights 0.15-50g)
Ca, Calcium (wt.%) 0.461 0.018 0.446 0.475 Aqua Regia Digestion (sample weights 0.15-50g)
Co, Cobalt (ppm) 15.7 1.31 14.7 16.6 Aqua Regia Digestion (sample weights 0.15-50g)
Cr, Chromium (ppm) 106 3 105 108 Aqua Regia Digestion (sample weights 0.15-50g)
Cs, Caesium (ppm) 9.15 0.610 8.38 9.92 Aqua Regia Digestion (sample weights 0.15-50g)
Cu, Copper (ppm) 36.4 1.31 35.4 37.3 Aqua Regia Digestion (sample weights 0.15-50g)
Fe, Iron (wt.%) 3.93 0.254 3.71 4.14 Aqua Regia Digestion (sample weights 0.15-50g)
Ga, Gallium (ppm) 10.8 1.1 9.8 11.7 Aqua Regia Digestion (sample weights 0.15-50g)
K, Potassium (wt.%) 1.17 0.035 1.14 1.20 Aqua Regia Digestion (sample weights 0.15-50g)
Li, Lithium (ppm) 45.6 6.3 37.5 53.8 Aqua Regia Digestion (sample weights 0.15-50g)
Mg, Magnesium (wt.%) 1.36 0.071 1.31 1.42 Aqua Regia Digestion (sample weights 0.15-50g)
Mn, Manganese (wt.%) 0.035 0.002 0.034 0.036 Aqua Regia Digestion (sample weights 0.15-50g)
Mo, Molybdenum (ppm) 3.86 0.220 3.68 4.04 Aqua Regia Digestion (sample weights 0.15-50g)
Na, Sodium (wt.%) 0.108 0.009 0.099 0.116 Aqua Regia Digestion (sample weights 0.15-50g)
Ni, Nickel (ppm) 57 4.1 53 60 Aqua Regia Digestion (sample weights 0.15-50g)
Pb, Lead (ppm) 9.23 1.01 8.56 9.91 Aqua Regia Digestion (sample weights 0.15-50g)
Rb, Rubidium (ppm) 114 10 101 128 Aqua Regia Digestion (sample weights 0.15-50g)
S, Sulphur (wt.%) 0.200 0.010 0.190 0.210 Aqua Regia Digestion (sample weights 0.15-50g)
Sc, Scandium (ppm) 9.51 0.718 8.95 10.08 Aqua Regia Digestion (sample weights 0.15-50g)
Sn, Tin (ppm) 2.26 0.208 2.04 2.48 Aqua Regia Digestion (sample weights 0.15-50g)
Th, Thorium (ppm) 14.3 2.3 11.8 16.9 Aqua Regia Digestion (sample weights 0.15-50g)
Ti, Titanium (wt.%) 0.198 0.011 0.186 0.211 Aqua Regia Digestion (sample weights 0.15-50g)
Tl, Thallium (ppm) 0.66 0.08 0.56 0.75 Aqua Regia Digestion (sample weights 0.15-50g)
U, Uranium (ppm) 1.74 0.32 1.38 2.10 Aqua Regia Digestion (sample weights 0.15-50g)
V, Vanadium (ppm) 79 1.7 78 80 Aqua Regia Digestion (sample weights 0.15-50g)
Y, Yttrium (ppm) 12.3 1.8 10.3 14.4 Aqua Regia Digestion (sample weights 0.15-50g)
Zn, Zinc (ppm) 93 4.1 89 96 Aqua Regia Digestion (sample weights 0.15-50g)
Zr, Zirconium (ppm) 24.5 3.6 19.7 29.2 Aqua Regia Digestion (sample weights 0.15-50g)
C, Carbon (wt.%) 0.189 0.011 0.179 0.198 Infrared Combustion
S, Sulphur (wt.%) 0.190 0.013 0.179 0.201 Infrared Combustion
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Certificate DataPack SDS NRAM (231 KB)
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