| Description: OREAS 901 contains 89 certified values and is a low grade oxide copper-gold 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 (44 certified values)
- Aqua regia digestion with ICP-OES and ICP-MS finish (43 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
Download Certificate OREAS901 Download DataPack OREAS901 | Analyte | Certified Value | 1SD | 95% CI Low | 95% CI High | Method |
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| Ag, Silver (ppm) | 0.439 | 0.059 | 0.406 | 0.472 | 4-Acid Digestion | | Al, Aluminium (wt.%) | 6.81 | 0.356 | 6.64 | 6.99 | 4-Acid Digestion | | As, Arsenic (ppm) | 71 | 3.6 | 69 | 72 | 4-Acid Digestion | | Ba, Barium (ppm) | 229 | 12 | 224 | 235 | 4-Acid Digestion | | Be, Beryllium (ppm) | 6.17 | 0.536 | 5.91 | 6.43 | 4-Acid Digestion | | Bi, Bismuth (ppm) | 4.75 | 0.185 | 4.66 | 4.85 | 4-Acid Digestion | | Ca, Calcium (wt.%) | 0.092 | 0.006 | 0.089 | 0.094 | 4-Acid Digestion | | Ce, Cerium (ppm) | 95 | 5.5 | 92 | 99 | 4-Acid Digestion | | Co, Cobalt (ppm) | 73 | 4.2 | 71 | 75 | 4-Acid Digestion | | Cr, Chromium (ppm) | 57 | 3.7 | 55 | 59 | 4-Acid Digestion | | Cs, Caesium (ppm) | 5.12 | 0.233 | 4.98 | 5.26 | 4-Acid Digestion | | Cu, Copper (wt.%) | 0.141 | 0.005 | 0.139 | 0.143 | 4-Acid Digestion | | Fe, Iron (wt.%) | 4.03 | 0.145 | 3.96 | 4.1 | 4-Acid Digestion | | Ga, Gallium (ppm) | 18.7 | 1.04 | 18.1 | 19.2 | 4-Acid Digestion | | Hf, Hafnium (ppm) | 5.27 | 0.449 | 5 | 5.55 | 4-Acid Digestion | | In, Indium (ppm) | 0.26 | 0.025 | 0.25 | 0.28 | 4-Acid Digestion | | K, Potassium (wt.%) | 3.67 | 0.189 | 3.57 | 3.77 | 4-Acid Digestion | | La, Lanthanum (ppm) | 47 | 3.24 | 45.2 | 48.7 | 4-Acid Digestion | | Li, Lithium (ppm) | 17.9 | 1.02 | 17.5 | 18.4 | 4-Acid Digestion | | Lu, Lutetium (ppm) | 0.53 | 0.09 | 0.46 | 0.6 | 4-Acid Digestion | | Mg, Magnesium (wt.%) | 0.6 | 0.049 | 0.573 | 0.627 | 4-Acid Digestion | | Mn, Manganese (wt.%) | 0.029 | 0.001 | 0.029 | 0.029 | 4-Acid Digestion | | Mo, Molybdenum (ppm) | 3.36 | 0.234 | 3.24 | 3.48 | 4-Acid Digestion | | Na, Sodium (wt.%) | 0.042 | 0.005 | 0.039 | 0.044 | 4-Acid Digestion | | Ni, Nickel (ppm) | 39.9 | 2.22 | 38.9 | 40.9 | 4-Acid Digestion | | P, Phosphorus (wt.%) | 0.062 | 0.006 | 0.059 | 0.065 | 4-Acid Digestion | | Pb, Lead (ppm) | 17.4 | 1.9 | 16.5 | 18.4 | 4-Acid Digestion | | Rb, Rubidium (ppm) | 161 | 18 | 150 | 172 | 4-Acid Digestion | | S, Sulphur (wt.%) | 0.036 | 0.005 | 0.034 | 0.038 | 4-Acid Digestion | | Sb, Antimony (ppm) | 2.61 | 0.159 | 2.52 | 2.69 | 4-Acid Digestion | | Sc, Scandium (ppm) | 14 | 1.02 | 13.6 | 14.5 | 4-Acid Digestion | | Sn, Tin (ppm) | 3.33 | 0.235 | 3.18 | 3.48 | 4-Acid Digestion | | Sr, Strontium (ppm) | 31 | 1.92 | 30.1 | 31.9 | 4-Acid Digestion | | Ta, Tantalum (ppm) | 0.76 | 0.057 | 0.72 | 0.8 | 4-Acid Digestion | | Tb, Terbium (ppm) | 1.18 | 0.21 | 1 | 1.36 | 4-Acid Digestion | | Te, Tellurium (ppm) | 0.09 | 0.015 | 0.08 | 0.099 | 4-Acid Digestion | | Th, Thorium (ppm) | 16.1 | 2 | 15 | 17.2 | 4-Acid Digestion | | Tl, Thallium (ppm) | 0.78 | 0.053 | 0.74 | 0.81 | 4-Acid Digestion | | U, Uranium (ppm) | 10.3 | 0.52 | 10 | 10.6 | 4-Acid Digestion | | V, Vanadium (ppm) | 81 | 4.3 | 79 | 83 | 4-Acid Digestion | | Y, Yttrium (ppm) | 37.4 | 3.64 | 35.4 | 39.4 | 4-Acid Digestion | | Yb, Ytterbium (ppm) | 3.58 | 0.196 | 3.41 | 3.74 | 4-Acid Digestion | | Zn, Zinc (ppm) | 24 | 3.2 | 22.4 | 25.5 | 4-Acid Digestion | | Zr, Zirconium (ppm) | 176 | 10 | 171 | 182 | 4-Acid Digestion | | Ag, Silver (ppm) | 0.276 | 0.021 | 0.268 | 0.284 | Aqua Regia Digestion | | Al, Aluminium (wt.%) | 0.992 | 0.064 | 0.953 | 1.031 | Aqua Regia Digestion | | As, Arsenic (ppm) | 66 | 2.8 | 64 | 67 | Aqua Regia Digestion | | Au, Gold (ppb) | 340 | 38 | 318 | 362 | Aqua Regia Digestion | | Ba, Barium (ppm) | 86 | 7.1 | 82 | 90 | Aqua Regia Digestion | | Be, Beryllium (ppm) | 4.49 | 0.373 | 4.27 | 4.71 | Aqua Regia Digestion | | Bi, Bismuth (ppm) | 4.35 | 0.339 | 4.15 | 4.54 | Aqua Regia Digestion | | Ca, Calcium (wt.%) | 0.091 | 0.002 | 0.09 | 0.092 | Aqua Regia Digestion | | Ce, Cerium (ppm) | 78 | 4.1 | 75 | 81 | Aqua Regia Digestion | | Co, Cobalt (ppm) | 73 | 4.1 | 71 | 75 | Aqua Regia Digestion | | Cr, Chromium (ppm) | 23 | 2.01 | 22 | 24.1 | Aqua Regia Digestion | | Cs, Caesium (ppm) | 0.97 | 0.13 | 0.89 | 1.06 | Aqua Regia Digestion | | Cu, Copper (wt.%) | 0.144 | 0.007 | 0.141 | 0.147 | Aqua Regia Digestion | | Fe, Iron (wt.%) | 3.7 | 0.256 | 3.56 | 3.83 | Aqua Regia Digestion | | Ga, Gallium (ppm) | 3.15 | 0.33 | 2.92 | 3.39 | Aqua Regia Digestion | | Ge, Germanium (ppm) | 0.11 | 0.02 | 0.09 | 0.13 | Aqua Regia Digestion | | In, Indium (ppm) | 0.21 | 0.018 | 0.2 | 0.22 | Aqua Regia Digestion | | K, Potassium (wt.%) | 0.512 | 0.043 | 0.487 | 0.538 | Aqua Regia Digestion | | La, Lanthanum (ppm) | 38.1 | 2.95 | 36.5 | 39.7 | Aqua Regia Digestion | | Lu, Lutetium (ppm) | 0.22 | 0.03 | 0.2 | 0.25 | Aqua Regia Digestion | | Mg, Magnesium (wt.%) | 0.124 | 0.01 | 0.118 | 0.13 | Aqua Regia Digestion | | Mn, Manganese (wt.%) | 0.03 | 0.002 | 0.029 | 0.031 | Aqua Regia Digestion | | Mo, Molybdenum (ppm) | 3.23 | 0.307 | 3.06 | 3.39 | Aqua Regia Digestion | | Ni, Nickel (ppm) | 34.7 | 1.63 | 33.8 | 35.5 | Aqua Regia Digestion | | P, Phosphorus (wt.%) | 0.059 | 0.004 | 0.057 | 0.061 | Aqua Regia Digestion | | Pb, Lead (ppm) | 14.6 | 1.8 | 13.7 | 15.5 | Aqua Regia Digestion | | Rb, Rubidium (ppm) | 23.9 | 1.51 | 22.9 | 24.9 | Aqua Regia Digestion | | S, Sulphur (wt.%) | 0.033 | 0.004 | 0.031 | 0.035 | Aqua Regia Digestion | | Sb, Antimony (ppm) | 1.47 | 0.23 | 1.35 | 1.6 | Aqua Regia Digestion | | Sc, Scandium (ppm) | 5.55 | 0.495 | 5.27 | 5.84 | Aqua Regia Digestion | | Se, Selenium (ppm) | 2.68 | 0.3 | 2.58 | 2.77 | Aqua Regia Digestion | | Sn, Tin (ppm) | 0.58 | 0.11 | 0.51 | 0.64 | Aqua Regia Digestion | | Sr, Strontium (ppm) | 21 | 1.12 | 20.4 | 21.6 | Aqua Regia Digestion | | Tb, Terbium (ppm) | 0.77 | 0.09 | 0.68 | 0.86 | Aqua Regia Digestion | | Te, Tellurium (ppm) | 0.076 | 0.014 | 0.068 | 0.083 | Aqua Regia Digestion | | Th, Thorium (ppm) | 9.13 | 0.765 | 8.68 | 9.58 | Aqua Regia Digestion | | Ti, Titanium (wt.%) | 0.008 | 0.002 | 0.007 | 0.009 | Aqua Regia Digestion | | Tl, Thallium (ppm) | 0.34 | 0.03 | 0.32 | 0.36 | Aqua Regia Digestion | | U, Uranium (ppm) | 5.84 | 0.493 | 5.54 | 6.13 | Aqua Regia Digestion | | Y, Yttrium (ppm) | 18.8 | 1.46 | 17.9 | 19.7 | Aqua Regia Digestion | | Yb, Ytterbium (ppm) | 1.49 | 0.15 | 1.34 | 1.63 | Aqua Regia Digestion | | Zn, Zinc (ppm) | 20.2 | 2.2 | 19.1 | 21.3 | Aqua Regia Digestion | | Zr, Zirconium (ppm) | 28.1 | 3.7 | 25.4 | 30.9 | Aqua Regia Digestion | | Au, Gold (ppb) | 363 | 18 | 353 | 372 | Pb Fire Assay | | Cu-Sol(H2SO4), Copper soluble (sulphuric) (wt.%) | 0.083 | 0.004 | 0.081 | 0.086 | Sulphuric Acid 5% Leach |
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