OREAS 902

OREAS 902 contains 86 certified values and is a low grade transitional 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 (45 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
Analyte Certified Value 1SD 95% Confidence Low 95% Confidence High Method
Cu, Copper (wt.%) 0.301 0.008 0.298 0.304 4-Acid Digestion
Au, Gold (ppb) < 10 IND IND IND Aqua Regia Digestion
Cu-Sol(H2SO4), Copper soluble (sulphuric) (wt.%) 0.111 0.011 0.105 0.118 Sulphuric Acid 5% Leach
Ag, Silver (ppm) 0.343 0.043 0.322 0.363 4-Acid Digestion
Al, Aluminium (wt.%) 4.74 0.219 4.64 4.84 4-Acid Digestion
As, Arsenic (ppm) 574 25 562 586 4-Acid Digestion
Ba, Barium (ppm) 170 6 167 173 4-Acid Digestion
Be, Beryllium (ppm) 2.23 0.195 2.13 2.33 4-Acid Digestion
Bi, Bismuth (ppm) 8.49 0.362 8.33 8.66 4-Acid Digestion
Ca, Calcium (wt.%) 4.05 0.142 3.98 4.13 4-Acid Digestion
Ce, Cerium (ppm) 75 3.9 72 77 4-Acid Digestion
Co, Cobalt (ppm) 926 28 912 940 4-Acid Digestion
Cr, Chromium (ppm) 51 6 47 54 4-Acid Digestion
Cs, Caesium (ppm) 2.88 0.096 2.82 2.93 4-Acid Digestion
Fe, Iron (wt.%) 3.19 0.144 3.12 3.27 4-Acid Digestion
Ga, Gallium (ppm) 11.7 0.63 11.3 12.1 4-Acid Digestion
Ge, Germanium (ppm) 0.18 0.03 0.15 0.21 4-Acid Digestion
Hf, Hafnium (ppm) 4.43 0.316 4.24 4.62 4-Acid Digestion
In, Indium (ppm) 0.25 0.03 0.23 0.27 4-Acid Digestion
K, Potassium (wt.%) 3.21 0.168 3.13 3.30 4-Acid Digestion
La, Lanthanum (ppm) 36.7 2.41 35.5 37.9 4-Acid Digestion
Li, Lithium (ppm) 9.77 0.636 9.44 10.11 4-Acid Digestion
Lu, Lutetium (ppm) 0.30 0.03 0.28 0.33 4-Acid Digestion
Mg, Magnesium (wt.%) 2.48 0.096 2.43 2.52 4-Acid Digestion
Mn, Manganese (wt.%) 0.046 0.003 0.044 0.047 4-Acid Digestion
Mo, Molybdenum (ppm) 12.2 0.65 11.9 12.5 4-Acid Digestion
Na, Sodium (wt.%) 0.044 0.007 0.041 0.048 4-Acid Digestion
Ni, Nickel (ppm) 164 6 161 167 4-Acid Digestion
P, Phosphorus (wt.%) 0.069 0.006 0.066 0.073 4-Acid Digestion
Pb, Lead (ppm) 13.3 1.4 12.6 14.0 4-Acid Digestion
Rb, Rubidium (ppm) 109 11 103 115 4-Acid Digestion
Re, Rhenium (ppm) 0.006 0.001 0.006 0.007 4-Acid Digestion
S, Sulphur (wt.%) 1.76 0.064 1.72 1.79 4-Acid Digestion
Sb, Antimony (ppm) 1.65 0.086 1.61 1.69 4-Acid Digestion
Sc, Scandium (ppm) 6.90 0.585 6.63 7.17 4-Acid Digestion
Se, Selenium (ppm) 2.41 0.45 2.10 2.72 4-Acid Digestion
Sn, Tin (ppm) 2.05 0.185 1.95 2.15 4-Acid Digestion
Sr, Strontium (ppm) 28.4 1.70 27.6 29.2 4-Acid Digestion
Tb, Terbium (ppm) 0.58 0.07 0.52 0.64 4-Acid Digestion
Th, Thorium (ppm) 11.3 0.67 10.9 11.7 4-Acid Digestion
Tl, Thallium (ppm) 0.70 0.042 0.68 0.73 4-Acid Digestion
U, Uranium (ppm) 6.47 0.316 6.28 6.65 4-Acid Digestion
V, Vanadium (ppm) 54 2.6 53 55 4-Acid Digestion
W, Tungsten (ppm) 3.83 0.42 3.60 4.06 4-Acid Digestion
Y, Yttrium (ppm) 18.1 1.41 17.4 18.9 4-Acid Digestion
Yb, Ytterbium (ppm) 1.94 0.128 1.83 2.04 4-Acid Digestion
Zr, Zirconium (ppm) 150 11 144 155 4-Acid Digestion
Ag, Silver (ppm) 0.284 0.031 0.271 0.297 Aqua Regia Digestion
Al, Aluminium (wt.%) 0.535 0.056 0.501 0.569 Aqua Regia Digestion
As, Arsenic (ppm) 569 33 555 584 Aqua Regia Digestion
Be, Beryllium (ppm) 0.99 0.074 0.95 1.04 Aqua Regia Digestion
Bi, Bismuth (ppm) 8.43 0.766 8.05 8.81 Aqua Regia Digestion
Ca, Calcium (wt.%) 4.19 0.286 4.05 4.33 Aqua Regia Digestion
Ce, Cerium (ppm) 28.3 3.7 25.8 30.8 Aqua Regia Digestion
Co, Cobalt (ppm) 908 67 875 941 Aqua Regia Digestion
Cr, Chromium (ppm) 24.1 2.8 22.8 25.4 Aqua Regia Digestion
Cs, Caesium (ppm) 0.30 0.03 0.28 0.32 Aqua Regia Digestion
Cu, Copper (wt.%) 0.308 0.012 0.303 0.314 Aqua Regia Digestion
Fe, Iron (wt.%) 3.04 0.176 2.94 3.13 Aqua Regia Digestion
Ga, Gallium (ppm) 1.55 0.105 1.48 1.63 Aqua Regia Digestion
Hf, Hafnium (ppm) 0.54 0.047 0.51 0.57 Aqua Regia Digestion
In, Indium (ppm) 0.22 0.018 0.20 0.23 Aqua Regia Digestion
K, Potassium (wt.%) 0.268 0.032 0.249 0.287 Aqua Regia Digestion
Li, Lithium (ppm) 3.67 0.61 3.25 4.08 Aqua Regia Digestion
Lu, Lutetium (ppm) 0.088 0.010 0.078 0.099 Aqua Regia Digestion
Mg, Magnesium (wt.%) 2.24 0.120 2.18 2.31 Aqua Regia Digestion
Mn, Manganese (wt.%) 0.046 0.002 0.045 0.048 Aqua Regia Digestion
Mo, Molybdenum (ppm) 12.6 0.92 12.1 13.1 Aqua Regia Digestion
Ni, Nickel (ppm) 159 9 154 164 Aqua Regia Digestion
P, Phosphorus (wt.%) 0.067 0.003 0.066 0.069 Aqua Regia Digestion
Pb, Lead (ppm) 10.7 0.98 10.3 11.2 Aqua Regia Digestion
Rb, Rubidium (ppm) 9.93 1.06 9.25 10.62 Aqua Regia Digestion
Re, Rhenium (ppm) 0.006 0.001 0.006 0.007 Aqua Regia Digestion
S, Sulphur (wt.%) 1.78 0.142 1.70 1.85 Aqua Regia Digestion
Sb, Antimony (ppm) 0.89 0.10 0.83 0.95 Aqua Regia Digestion
Sc, Scandium (ppm) 2.93 0.36 2.76 3.10 Aqua Regia Digestion
Se, Selenium (ppm) 1.94 0.37 1.74 2.15 Aqua Regia Digestion
Sr, Strontium (ppm) 21.8 1.55 21.0 22.6 Aqua Regia Digestion
Tb, Terbium (ppm) 0.31 0.03 0.28 0.35 Aqua Regia Digestion
Th, Thorium (ppm) 5.05 0.472 4.78 5.32 Aqua Regia Digestion
Tl, Thallium (ppm) 0.24 0.03 0.22 0.26 Aqua Regia Digestion
U, Uranium (ppm) 2.20 0.26 2.05 2.36 Aqua Regia Digestion
V, Vanadium (ppm) 8.79 1.54 7.88 9.70 Aqua Regia Digestion
Y, Yttrium (ppm) 7.95 0.684 7.54 8.36 Aqua Regia Digestion
Yb, Ytterbium (ppm) 0.61 0.054 0.56 0.66 Aqua Regia Digestion
Zr, Zirconium (ppm) 15.0 2.5 13.4 16.5 Aqua Regia Digestion
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