OREAS 904

OREAS 904 contains 88 certified values and is a medium grade oxide copper ore certified reference material. It is one of a suite of four transitional to oxide copper (-gold) CRMs prepared from samples sourced from CST’s Lady Annie Mine, located 120 kms northwest of Mount Isa, Queensland, Australia. Mineralisation at Lady Annie is hosted in dolomitic, carbonaceous and argillaceous sandstones and siltstones. The primary copper sulphide mineralisation at depth is dominated by chalcocite and chalcopyrite and appears to be structurally controlled, being commonly associated with fault-related silicification.

Nineteen commercial analytical laboratories participated in the program. The following methods were employed:

  • Four acid digestion with ICP-OES and ICP-MS finish (46 certified values)
  • Aqua regia digestion with ICP-OES and ICP-MS finish (40 certified values)
  • Soluble Cu via 5% H2SO4 acid leach with AAS or ICP-OES finish
  • Gold via fire assay with ICP-OES, ICP-MS, AAS or solvent extraction AAS finish
  • Gold homogeneity confirmation via instrumental neutron activation analysis (INAA) on 20 x 1g subsamples
Analyte Certified Value 1SD 95% Confidence Low 95% Confidence High Method
Cu, Copper (wt.%) 0.612 0.021 0.601 0.622 4-Acid Digestion
Au, Gold (ppb) 45 4 43 47 Pb Fire Assay
Cu-Sol(H2SO4), Copper soluble (sulphuric) (wt.%) 0.519 0.028 0.503 0.534 Sulphuric Acid Leach
Ag, Silver (ppm) 0.551 0.053 0.529 0.573 4-Acid Digestion
Al, Aluminium (wt.%) 6.30 0.315 6.13 6.47 4-Acid Digestion
As, Arsenic (ppm) 98 4.9 96 101 4-Acid Digestion
Ba, Barium (ppm) 194 9 190 198 4-Acid Digestion
Be, Beryllium (ppm) 7.86 0.768 7.46 8.25 4-Acid Digestion
Bi, Bismuth (ppm) 4.05 0.174 3.97 4.14 4-Acid Digestion
Ca, Calcium (wt.%) 0.046 0.005 0.044 0.048 4-Acid Digestion
Ce, Cerium (ppm) 86 8.5 82 90 4-Acid Digestion
Co, Cobalt (ppm) 83 7.0 80 87 4-Acid Digestion
Cr, Chromium (ppm) 54 3.8 52 56 4-Acid Digestion
Cs, Caesium (ppm) 3.79 0.181 3.68 3.89 4-Acid Digestion
Fe, Iron (wt.%) 6.68 0.291 6.53 6.83 4-Acid Digestion
Ga, Gallium (ppm) 16.7 0.85 16.3 17.1 4-Acid Digestion
Ge, Germanium (ppm) 0.18 0.03 0.14 0.23 4-Acid Digestion
Hf, Hafnium (ppm) 4.99 0.352 4.78 5.20 4-Acid Digestion
In, Indium (ppm) 0.22 0.017 0.21 0.23 4-Acid Digestion
K, Potassium (wt.%) 3.31 0.184 3.21 3.42 4-Acid Digestion
La, Lanthanum (ppm) 43.2 2.90 41.6 44.9 4-Acid Digestion
Li, Lithium (ppm) 16.7 0.66 16.4 17.0 4-Acid Digestion
Lu, Lutetium (ppm) 0.47 0.025 0.44 0.49 4-Acid Digestion
Mg, Magnesium (wt.%) 0.556 0.034 0.538 0.574 4-Acid Digestion
Mn, Manganese (wt.%) 0.041 0.002 0.040 0.042 4-Acid Digestion
Mo, Molybdenum (ppm) 2.12 0.184 2.04 2.21 4-Acid Digestion
Na, Sodium (wt.%) 0.034 0.004 0.032 0.036 4-Acid Digestion
Ni, Nickel (ppm) 40.1 1.83 39.3 41.0 4-Acid Digestion
P, Phosphorus (wt.%) 0.098 0.008 0.093 0.102 4-Acid Digestion
Pb, Lead (ppm) 10.6 1.2 9.9 11.2 4-Acid Digestion
Rb, Rubidium (ppm) 130 20 118 141 4-Acid Digestion
S, Sulphur (wt.%) 0.063 0.005 0.060 0.065 4-Acid Digestion
Sb, Antimony (ppm) 1.48 0.106 1.42 1.54 4-Acid Digestion
Sc, Scandium (ppm) 11.2 0.81 10.8 11.6 4-Acid Digestion
Se, Selenium (ppm) 3.30 0.60 2.94 3.66 4-Acid Digestion
Sn, Tin (ppm) 2.83 0.174 2.73 2.93 4-Acid Digestion
Sr, Strontium (ppm) 27.2 1.88 26.2 28.1 4-Acid Digestion
Ta, Tantalum (ppm) 0.54 0.09 0.48 0.61 4-Acid Digestion
Tb, Terbium (ppm) 1.00 0.11 0.91 1.09 4-Acid Digestion
Th, Thorium (ppm) 14.3 1.5 13.5 15.1 4-Acid Digestion
Tl, Thallium (ppm) 0.52 0.026 0.50 0.53 4-Acid Digestion
U, Uranium (ppm) 8.43 0.721 8.03 8.82 4-Acid Digestion
V, Vanadium (ppm) 76 3.0 74 77 4-Acid Digestion
W, Tungsten (ppm) 2.12 0.36 1.92 2.32 4-Acid Digestion
Y, Yttrium (ppm) 31.5 3.4 29.8 33.2 4-Acid Digestion
Yb, Ytterbium (ppm) 3.14 0.229 2.98 3.30 4-Acid Digestion
Zn, Zinc (ppm) 26.3 3.5 24.5 28.1 4-Acid Digestion
Zr, Zirconium (ppm) 171 9 166 176 4-Acid Digestion
Ag, Silver (ppm) 0.366 0.035 0.350 0.382 Aqua Regia Digestion
Al, Aluminium (wt.%) 1.25 0.105 1.19 1.31 Aqua Regia Digestion
As, Arsenic (ppm) 91 5.3 89 94 Aqua Regia Digestion
Ba, Barium (ppm) 68 5.5 65 71 Aqua Regia Digestion
Be, Beryllium (ppm) 6.54 0.362 6.34 6.73 Aqua Regia Digestion
Bi, Bismuth (ppm) 3.74 0.370 3.56 3.92 Aqua Regia Digestion
Ca, Calcium (wt.%) 0.040 0.002 0.040 0.041 Aqua Regia Digestion
Cd, Cadmium (ppm) 0.058 0.008 0.053 0.063 Aqua Regia Digestion
Ce, Cerium (ppm) 70 4.9 67 73 Aqua Regia Digestion
Co, Cobalt (ppm) 82 4.8 80 85 Aqua Regia Digestion
Cr, Chromium (ppm) 17.5 2.5 16.1 18.9 Aqua Regia Digestion
Cs, Caesium (ppm) 0.62 0.061 0.58 0.66 Aqua Regia Digestion
Cu, Copper (wt.%) 0.630 0.018 0.622 0.639 Aqua Regia Digestion
Fe, Iron (wt.%) 6.40 0.418 6.18 6.62 Aqua Regia Digestion
Ga, Gallium (ppm) 3.40 0.47 3.12 3.69 Aqua Regia Digestion
In, Indium (ppm) 0.17 0.016 0.16 0.18 Aqua Regia Digestion
K, Potassium (wt.%) 0.603 0.054 0.571 0.635 Aqua Regia Digestion
La, Lanthanum (ppm) 33.9 2.64 32.5 35.3 Aqua Regia Digestion
Lu, Lutetium (ppm) 0.21 0.02 0.18 0.23 Aqua Regia Digestion
Mg, Magnesium (wt.%) 0.143 0.019 0.132 0.153 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.041 0.003 0.040 0.042 Aqua Regia Digestion
Mo, Molybdenum (ppm) 2.02 0.23 1.88 2.15 Aqua Regia Digestion
Ni, Nickel (ppm) 36.6 1.57 35.8 37.4 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.095 0.004 0.093 0.097 Aqua Regia Digestion
Pb, Lead (ppm) 8.49 0.94 7.98 9.00 Aqua Regia Digestion
Rb, Rubidium (ppm) 22.4 1.44 21.5 23.4 Aqua Regia Digestion
S, Sulphur (wt.%) 0.034 0.007 0.030 0.037 Aqua Regia Digestion
Sb, Antimony (ppm) 0.78 0.11 0.72 0.84 Aqua Regia Digestion
Sc, Scandium (ppm) 3.83 0.52 3.53 4.13 Aqua Regia Digestion
Se, Selenium (ppm) 2.81 0.29 2.73 2.90 Aqua Regia Digestion
Sn, Tin (ppm) 0.58 0.11 0.51 0.66 Aqua Regia Digestion
Sr, Strontium (ppm) 16.5 0.92 16.0 17.0 Aqua Regia Digestion
Tb, Terbium (ppm) 0.70 0.027 0.67 0.73 Aqua Regia Digestion
Th, Thorium (ppm) 7.56 0.696 7.16 7.96 Aqua Regia Digestion
Tl, Thallium (ppm) 0.15 0.02 0.14 0.16 Aqua Regia Digestion
U, Uranium (ppm) 5.20 0.54 4.89 5.50 Aqua Regia Digestion
V, Vanadium (ppm) 21.7 0.89 21.3 22.2 Aqua Regia Digestion
Y, Yttrium (ppm) 17.2 1.24 16.4 17.9 Aqua Regia Digestion
Yb, Ytterbium (ppm) 1.41 0.084 1.33 1.50 Aqua Regia Digestion
Zn, Zinc (ppm) 22.4 2.05 21.4 23.3 Aqua Regia Digestion
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Specifications
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