OREAS 921

OREAS 921 is one of a suite of sixteen copper ore CRMs (OREAS 920 to OREAS 935) prepared from material from the CSA mine located near the town of Cobar in central western New South Wales, Australia. The copper ore body is hosted by the Early Devonian CSA Siltstone, a thinly bedded turbiditic sequence of carbonaceous siltstones and mudstones with minor coarser units. The CSA Siltstone is part of the Cobar Supergroup, consisting of lower syn-rift sediments and upper post-rift sag phase sediments. The mineralisation is structurally controlled and confined to a number of steeply dipping bodies within a major shear zone on the eastern margin of the Early Devonian Cobar Basin. It is characterised by low-grade greenschist alteration and epigenetic low-grade mineralisation enveloping higher-grade shoots of vein complexes or sub-massive to massive sulphides. The sulphides include chalcopyrite, pyrrhotite, pyrite, sphalerite, galena, bornite and cubanite. Iron-rich chlorite and silica are prominent alterations in the siltstone host.

Twenty two commercial analytical laboratories participated in the program to characterise the analytes reported below. The following methods were employed for method specific certification:

  • Four acid (HCl-HNO3-HF-HClO4) digestion with ICP-OES, ICP-MS or AAS finish (19 laboratories);
  • Aqua regia digestion with ICP-OES, ICP-MS or AAS finish (19 laboratories);
  • Peroxide fusion with ICP-OES, ICP-MS or AAS finish (12 laboratories).

    Analyte Certified Value 1SD 95% Confidence Low 95% Confidence High Method
    Cu, Copper (ppm) 274 9 271 277 4-Acid Digestion
    Ag, Silver (ppm) 0.152 0.029 0.143 0.161 4-Acid Digestion
    Zn, Zinc (ppm) 132 6 130 135 4-Acid Digestion
    Al, Aluminium (wt.%) 7.62 0.444 7.40 7.84 4-Acid Digestion
    As, Arsenic (ppm) 5.15 0.90 4.80 5.50 4-Acid Digestion
    Ba, Barium (ppm) 537 25 525 549 4-Acid Digestion
    Be, Beryllium (ppm) 2.83 0.202 2.72 2.94 4-Acid Digestion
    Bi, Bismuth (ppm) 1.20 0.17 1.13 1.27 4-Acid Digestion
    Ca, Calcium (wt.%) 0.496 0.027 0.484 0.508 4-Acid Digestion
    Cd, Cadmium (ppm) < 0.20 IND IND IND 4-Acid Digestion
    Ce, Cerium (ppm) 91 3.3 89 93 4-Acid Digestion
    Co, Cobalt (ppm) 16.5 0.98 16.0 17.0 4-Acid Digestion
    Cr, Chromium (ppm) 79 7.5 76 82 4-Acid Digestion
    Cs, Caesium (ppm) 8.53 0.501 8.24 8.81 4-Acid Digestion
    Dy, Dysprosium (ppm) 6.25 0.323 6.06 6.45 4-Acid Digestion
    Er, Erbium (ppm) 3.61 0.142 3.57 3.65 4-Acid Digestion
    Eu, Europium (ppm) 1.48 0.084 1.43 1.54 4-Acid Digestion
    Fe, Iron (wt.%) 4.30 0.147 4.23 4.38 4-Acid Digestion
    Ga, Gallium (ppm) 21.3 1.33 20.7 22.0 4-Acid Digestion
    Gd, Gadolinium (ppm) 6.83 0.432 6.58 7.07 4-Acid Digestion
    Ge, Germanium (ppm) < 2.00 IND IND IND 4-Acid Digestion
    Hf, Hafnium (ppm) 4.45 0.323 4.29 4.60 4-Acid Digestion
    Ho, Holmium (ppm) 1.23 0.063 1.19 1.27 4-Acid Digestion
    In, Indium (ppm) 0.11 0.009 0.10 0.11 4-Acid Digestion
    K, Potassium (wt.%) 2.84 0.098 2.79 2.88 4-Acid Digestion
    La, Lanthanum (ppm) 45.9 1.97 44.8 47.0 4-Acid Digestion
    Li, Lithium (ppm) 28.9 1.54 28.1 29.7 4-Acid Digestion
    Lu, Lutetium (ppm) 0.49 0.027 0.47 0.51 4-Acid Digestion
    Mg, Magnesium (wt.%) 1.42 0.048 1.41 1.44 4-Acid Digestion
    Mn, Manganese (wt.%) 0.064 0.002 0.063 0.065 4-Acid Digestion
    Mo, Molybdenum (ppm) 0.50 0.07 0.46 0.55 4-Acid Digestion
    Na, Sodium (wt.%) 0.607 0.023 0.594 0.619 4-Acid Digestion
    Nb, Niobium (ppm) 17.1 0.95 16.5 17.6 4-Acid Digestion
    Nd, Neodymium (ppm) 39.8 1.84 38.4 41.1 4-Acid Digestion
    Ni, Nickel (ppm) 41.1 2.69 39.9 42.3 4-Acid Digestion
    P, Phosphorus (wt.%) 0.070 0.005 0.068 0.073 4-Acid Digestion
    Pb, Lead (ppm) 28.0 1.61 27.3 28.6 4-Acid Digestion
    Pr, Praseodymium (ppm) 10.7 0.35 10.5 11.0 4-Acid Digestion
    Rb, Rubidium (ppm) 176 13 168 184 4-Acid Digestion
    Re, Rhenium (ppb) < 2 IND IND IND 4-Acid Digestion
    S, Sulphur (wt.%) 0.067 0.006 0.064 0.069 4-Acid Digestion
    Sb, Antimony (ppm) 1.44 0.071 1.42 1.47 4-Acid Digestion
    Sc, Scandium (ppm) 14.2 1.29 13.4 14.9 4-Acid Digestion
    Se, Selenium (ppm) < 2.00 IND IND IND 4-Acid Digestion
    Sm, Samarium (ppm) 7.70 0.468 7.32 8.08 4-Acid Digestion
    Sn, Tin (ppm) 5.82 0.64 5.38 6.26 4-Acid Digestion
    Sr, Strontium (ppm) 78 4.8 76 80 4-Acid Digestion
    Ta, Tantalum (ppm) 1.32 0.23 1.18 1.47 4-Acid Digestion
    Tb, Terbium (ppm) 1.05 0.051 1.01 1.08 4-Acid Digestion
    Te, Tellurium (ppm) < 0.050 IND IND IND 4-Acid Digestion
    Th, Thorium (ppm) 18.7 1.27 18.1 19.4 4-Acid Digestion
    Ti, Titanium (wt.%) 0.467 0.041 0.444 0.490 4-Acid Digestion
    Tl, Thallium (ppm) 0.91 0.051 0.89 0.94 4-Acid Digestion
    Tm, Thulium (ppm) 0.53 0.046 0.49 0.56 4-Acid Digestion
    U, Uranium (ppm) 3.69 0.154 3.61 3.76 4-Acid Digestion
    V, Vanadium (ppm) 97 5.6 94 100 4-Acid Digestion
    W, Tungsten (ppm) 3.05 0.233 2.91 3.19 4-Acid Digestion
    Y, Yttrium (ppm) 32.7 2.22 31.5 33.9 4-Acid Digestion
    Yb, Ytterbium (ppm) 3.22 0.186 3.11 3.33 4-Acid Digestion
    Zr, Zirconium (ppm) 147 10 142 152 4-Acid Digestion
    Ag, Silver (ppm) 0.164 0.029 0.146 0.182 Aqua Regia Digestion
    Al, Aluminium (wt.%) 2.48 0.186 2.38 2.58 Aqua Regia Digestion
    As, Arsenic (ppm) 4.46 0.400 4.26 4.66 Aqua Regia Digestion
    Au, Gold (ppb) < 5 IND IND IND Aqua Regia Digestion
    B, Boron (ppm) < 10.0 IND IND IND Aqua Regia Digestion
    Ba, Barium (ppm) 75 4.3 71 79 Aqua Regia Digestion
    Be, Beryllium (ppm) 0.74 0.09 0.69 0.79 Aqua Regia Digestion
    Bi, Bismuth (ppm) 1.25 0.14 1.19 1.31 Aqua Regia Digestion
    Ca, Calcium (wt.%) 0.322 0.013 0.315 0.329 Aqua Regia Digestion
    Cd, Cadmium (ppm) 0.085 0.009 0.082 0.087 Aqua Regia Digestion
    Ce, Cerium (ppm) 69 4.1 66 72 Aqua Regia Digestion
    Co, Cobalt (ppm) 15.5 0.78 15.1 15.8 Aqua Regia Digestion
    Cr, Chromium (ppm) 42.4 1.85 41.5 43.3 Aqua Regia Digestion
    Cs, Caesium (ppm) 2.04 0.35 1.83 2.25 Aqua Regia Digestion
    Cu, Copper (ppm) 278 10 274 283 Aqua Regia Digestion
    Dy, Dysprosium (ppm) < 6.00 IND IND IND Aqua Regia Digestion
    Er, Erbium (ppm) < 3.00 IND IND IND Aqua Regia Digestion
    Eu, Europium (ppm) < 1.50 IND IND IND Aqua Regia Digestion
    Fe, Iron (wt.%) 3.83 0.111 3.77 3.88 Aqua Regia Digestion
    Ga, Gallium (ppm) 7.03 0.563 6.72 7.33 Aqua Regia Digestion
    Gd, Gadolinium (ppm) < 7.00 IND IND IND Aqua Regia Digestion
    Ge, Germanium (ppm) < 0.20 IND IND IND Aqua Regia Digestion
    Hf, Hafnium (ppm) 0.62 0.07 0.56 0.67 Aqua Regia Digestion
    Hg, Mercury (ppm) < 0.020 IND IND IND Aqua Regia Digestion
    Ho, Holmium (ppm) < 1.00 IND IND IND Aqua Regia Digestion
    In, Indium (ppm) 0.053 0.005 0.050 0.056 Aqua Regia Digestion
    K, Potassium (wt.%) 0.433 0.065 0.399 0.468 Aqua Regia Digestion
    La, Lanthanum (ppm) 36.4 3.8 34.4 38.4 Aqua Regia Digestion
    Li, Lithium (ppm) 21.4 0.93 20.9 22.0 Aqua Regia Digestion
    Lu, Lutetium (ppm) < 0.40 IND IND IND Aqua Regia Digestion
    Mg, Magnesium (wt.%) 1.15 0.060 1.12 1.18 Aqua Regia Digestion
    Mn, Manganese (wt.%) 0.056 0.002 0.055 0.058 Aqua Regia Digestion
    Mo, Molybdenum (ppm) 0.45 0.06 0.41 0.49 Aqua Regia Digestion
    Na, Sodium (wt.%) 0.029 0.006 0.025 0.032 Aqua Regia Digestion
    Nb, Niobium (ppm) 0.42 0.07 0.36 0.48 Aqua Regia Digestion
    Nd, Neodymium (ppm) 31.2 5.3 26.5 36.0 Aqua Regia Digestion
    Ni, Nickel (ppm) 38.0 2.15 36.9 39.1 Aqua Regia Digestion
    P, Phosphorus (wt.%) 0.068 0.004 0.066 0.071 Aqua Regia Digestion
    Pb, Lead (ppm) 26.0 1.80 25.3 26.7 Aqua Regia Digestion
    Pr, Praseodymium (ppm) 7.98 0.98 6.90 9.05 Aqua Regia Digestion
    Rb, Rubidium (ppm) 24.2 2.5 22.4 25.9 Aqua Regia Digestion
    Re, Rhenium (ppb) < 1 IND IND IND Aqua Regia Digestion
    S, Sulphur (wt.%) 0.068 0.007 0.064 0.072 Aqua Regia Digestion
    Sb, Antimony (ppm) 0.61 0.08 0.56 0.66 Aqua Regia Digestion
    Sc, Scandium (ppm) 2.85 0.50 2.53 3.17 Aqua Regia Digestion
    Se, Selenium (ppm) 1.04 0.20 0.91 1.18 Aqua Regia Digestion
    Sm, Samarium (ppm) 5.60 1.08 4.66 6.55 Aqua Regia Digestion
    Sn, Tin (ppm) 1.45 0.23 1.29 1.61 Aqua Regia Digestion
    Sr, Strontium (ppm) 16.4 0.69 16.1 16.8 Aqua Regia Digestion
    Ta, Tantalum (ppm) < 0.050 IND IND IND Aqua Regia Digestion
    Tb, Terbium (ppm) < 1.00 IND IND IND Aqua Regia Digestion
    Te, Tellurium (ppm) < 0.050 IND IND IND Aqua Regia Digestion
    Th, Thorium (ppm) 15.0 0.88 14.5 15.5 Aqua Regia Digestion
    Ti, Titanium (wt.%) 0.116 0.018 0.104 0.127 Aqua Regia Digestion
    Tl, Thallium (ppm) 0.15 0.03 0.13 0.17 Aqua Regia Digestion
    Tm, Thulium (ppm) < 0.50 IND IND IND Aqua Regia Digestion
    U, Uranium (ppm) 2.08 0.21 1.94 2.21 Aqua Regia Digestion
    V, Vanadium (ppm) 26.2 1.88 25.1 27.3 Aqua Regia Digestion
    W, Tungsten (ppm) < 0.80 IND IND IND Aqua Regia Digestion
    Y, Yttrium (ppm) 18.3 2.8 16.6 19.9 Aqua Regia Digestion
    Yb, Ytterbium (ppm) < 3.00 IND IND IND Aqua Regia Digestion
    Zn, Zinc (ppm) 124 7 120 127 Aqua Regia Digestion
    Zr, Zirconium (ppm) 21.4 1.71 20.5 22.2 Aqua Regia Digestion
    Al, Aluminium (wt.%) 7.86 0.557 7.50 8.22 Peroxide Fusion ICP
    As, Arsenic (ppm) < 5.00 IND IND IND Peroxide Fusion ICP
    Ba, Barium (ppm) 549 23 536 563 Peroxide Fusion ICP
    Be, Beryllium (ppm) < 4.00 IND IND IND Peroxide Fusion ICP
    Bi, Bismuth (ppm) < 2.00 IND IND IND Peroxide Fusion ICP
    Ca, Calcium (wt.%) 0.537 0.089 0.478 0.596 Peroxide Fusion ICP
    Cd, Cadmium (ppm) < 2.00 IND IND IND Peroxide Fusion ICP
    Ce, Cerium (ppm) 93 5.0 89 97 Peroxide Fusion ICP
    Co, Cobalt (ppm) 17.3 1.67 16.3 18.3 Peroxide Fusion ICP
    Cr, Chromium (ppm) 97 14 87 108 Peroxide Fusion ICP
    Cs, Caesium (ppm) 8.81 0.420 8.55 9.08 Peroxide Fusion ICP
    Cu, Copper (ppm) 293 11 287 298 Peroxide Fusion ICP
    Dy, Dysprosium (ppm) 6.28 0.271 6.06 6.49 Peroxide Fusion ICP
    Er, Erbium (ppm) 3.72 0.38 3.41 4.03 Peroxide Fusion ICP
    Eu, Europium (ppm) 1.58 0.130 1.49 1.68 Peroxide Fusion ICP
    Fe, Iron (wt.%) 4.46 0.204 4.37 4.56 Peroxide Fusion ICP
    Ga, Gallium (ppm) 21.2 1.43 20.0 22.4 Peroxide Fusion ICP
    Gd, Gadolinium (ppm) 7.42 0.634 6.89 7.95 Peroxide Fusion ICP
    Ge, Germanium (ppm) < 5.00 IND IND IND Peroxide Fusion ICP
    Hf, Hafnium (ppm) 7.22 1.08 5.89 8.55 Peroxide Fusion ICP
    Ho, Holmium (ppm) 1.32 0.114 1.23 1.40 Peroxide Fusion ICP
    In, Indium (ppm) < 0.20 IND IND IND Peroxide Fusion ICP
    K, Potassium (wt.%) 2.86 0.119 2.79 2.92 Peroxide Fusion ICP
    La, Lanthanum (ppm) 47.6 2.15 46.6 48.7 Peroxide Fusion ICP
    Li, Lithium (ppm) 27.5 3.2 25.6 29.4 Peroxide Fusion ICP
    Lu, Lutetium (ppm) 0.56 0.06 0.49 0.63 Peroxide Fusion ICP
    Mg, Magnesium (wt.%) 1.43 0.074 1.39 1.48 Peroxide Fusion ICP
    Mn, Manganese (wt.%) 0.067 0.003 0.065 0.068 Peroxide Fusion ICP
    Mo, Molybdenum (ppm) < 1.00 IND IND IND Peroxide Fusion ICP
    Nb, Niobium (ppm) 17.2 2.5 15.1 19.4 Peroxide Fusion ICP
    Nd, Neodymium (ppm) 41.0 1.55 40.0 42.0 Peroxide Fusion ICP
    Ni, Nickel (ppm) 41.9 4.17 38.5 45.3 Peroxide Fusion ICP
    P, Phosphorus (wt.%) 0.071 0.007 0.065 0.076 Peroxide Fusion ICP
    Pb, Lead (ppm) 27.1 4.1 23.8 30.4 Peroxide Fusion ICP
    Pr, Praseodymium (ppm) 11.2 0.37 11.0 11.3 Peroxide Fusion ICP
    Rb, Rubidium (ppm) 178 7 172 184 Peroxide Fusion ICP
    S, Sulphur (wt.%) 0.078 0.016 0.062 0.094 Peroxide Fusion ICP
    Sb, Antimony (ppm) < 2.00 IND IND IND Peroxide Fusion ICP
    Si, Silicon (wt.%) 30.68 0.643 30.14 31.22 Peroxide Fusion ICP
    Sm, Samarium (ppm) 7.93 0.369 7.75 8.11 Peroxide Fusion ICP
    Sn, Tin (ppm) < 10.0 IND IND IND Peroxide Fusion ICP
    Sr, Strontium (ppm) 78 6.3 73 82 Peroxide Fusion ICP
    Ta, Tantalum (ppm) 1.42 0.20 1.25 1.59 Peroxide Fusion ICP
    Tb, Terbium (ppm) 1.10 0.085 1.03 1.17 Peroxide Fusion ICP
    Th, Thorium (ppm) 19.3 0.64 18.9 19.7 Peroxide Fusion ICP
    Ti, Titanium (wt.%) 0.484 0.022 0.470 0.498 Peroxide Fusion ICP
    Tl, Thallium (ppm) 0.96 0.058 0.91 1.00 Peroxide Fusion ICP
    Tm, Thulium (ppm) 0.57 0.046 0.53 0.61 Peroxide Fusion ICP
    U, Uranium (ppm) 4.03 0.244 3.83 4.23 Peroxide Fusion ICP
    V, Vanadium (ppm) 97 5.9 93 101 Peroxide Fusion ICP
    W, Tungsten (ppm) < 5.00 IND IND IND Peroxide Fusion ICP
    Y, Yttrium (ppm) 33.4 2.12 31.9 34.9 Peroxide Fusion ICP
    Yb, Ytterbium (ppm) 3.50 0.229 3.30 3.70 Peroxide Fusion ICP
    Zn, Zinc (ppm) 139 10 132 146 Peroxide Fusion ICP
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