OREAS 993

OREAS 993 was prepared from a copper-gold-silver concentrate sample supplied by Newcrest Mining Limited’s Cadia Valley Operations near Orange, New South Wales, Australia. Ten ‘umpire’ laboratories determined the key elements: Au, Cu and Ag. The term ‘umpire’ here refers to the routine analysis of these laboratories using classical methodologies for precious and base metals. Twenty-three geoanalytical laboratories also participated in the analytical program for the following:

  • Au, Pt and Pd by fire assay
  • Cu, Al2O3, MgO, SiO2, Fe, S, CaO, TiO2, K and Mo by oxidising fusion with XRF
  • Total Sulphur by infrared combustion furnace
  • Hg by low level, aqua regia digestion
  • Fluorine by ion selective electrode
  • Chlorine by various methods
  • Ag, As, Bi, Cd, Co, Cr, Ni, Pb, Re, Sb, Se, Te, Th, U and Zn by 4-acid digestion
  • Gold by instrumental neutron activation analysis (INAA) on 20 x 85mg subsamples to confirm homogeneity (undertaken by ANSTO, Lucas Heights)
Analyte Certified Value 1SD 95% Confidence Low 95% Confidence High Method
Cu, Copper (wt.%) 23.90 0.061 23.85 23.95 Classical Wet Chemistry
Au, Gold (ppm) 56.04 0.296 55.87 56.22 Pb Fire Assay (full corrections)
Ag, Silver (ppm) 41.6 1.12 40.7 42.5 Acid Digestion (no HF)
Au, Gold (ppm) 54.85 1.324 53.60 56.09 Pb Fire Assay
Pd, Palladium (ppb) 529 32 513 545 Pb Fire Assay
Pt, Platinum (ppb) 43.8 5.9 40.4 47.1 Pb Fire Assay
Al2O3, Aluminium(III) oxide (wt.%) 3.03 0.073 2.97 3.08 Oxidising Fusion XRF
CaO, Calcium oxide (wt.%) 0.982 0.012 0.974 0.990 Oxidising Fusion XRF
Cu, Copper (wt.%) 23.36 0.364 23.08 23.64 Oxidising Fusion XRF
Fe, Iron (wt.%) 25.41 0.291 25.19 25.62 Oxidising Fusion XRF
K, Potassium (wt.%) 0.640 0.021 0.623 0.658 Oxidising Fusion XRF
MgO, Magnesium oxide (wt.%) 0.512 0.067 0.448 0.576 Oxidising Fusion XRF
Mo, Molybdenum (ppm) 2512 119 2414 2611 Oxidising Fusion XRF
S, Sulphur (wt.%) 30.06 0.733 29.49 30.64 Oxidising Fusion XRF
SiO2, Silicon dioxide (wt.%) 10.56 0.187 10.42 10.70 Oxidising Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.198 0.013 0.189 0.206 Oxidising Fusion XRF
S, Sulphur (wt.%) 29.92 0.784 29.48 30.37 Infrared Combustion
Hg, Mercury (ppm) 1.92 0.143 1.82 2.03 Aqua Regia Digestion
F, Fluorine (ppm) 511 46 484 538 Miscellaneous Assay Methods
Ag, Silver (ppm) 39.7 1.24 39.1 40.3 4-Acid Digestion
Al, Aluminium (wt.%) 1.60 0.044 1.57 1.63 4-Acid Digestion
As, Arsenic (ppm) 143 7 140 146 4-Acid Digestion
Ba, Barium (ppm) 122 7 116 127 4-Acid Digestion
Be, Beryllium (ppm) < 0.50 IND IND IND 4-Acid Digestion
Bi, Bismuth (ppm) 23.8 5.0 20.4 27.1 4-Acid Digestion
Ca, Calcium (wt.%) 0.702 0.023 0.687 0.717 4-Acid Digestion
Cd, Cadmium (ppm) 6.41 1.58 5.08 7.73 4-Acid Digestion
Ce, Cerium (ppm) 18.2 1.38 16.7 19.7 4-Acid Digestion
Co, Cobalt (ppm) 95 5.4 93 98 4-Acid Digestion
Cr, Chromium (ppm) 39.5 4.2 35.9 43.0 4-Acid Digestion
Dy, Dysprosium (ppm) 1.02 0.070 0.97 1.07 4-Acid Digestion
Er, Erbium (ppm) 0.54 0.06 0.48 0.59 4-Acid Digestion
Eu, Europium (ppm) 0.43 0.07 0.37 0.50 4-Acid Digestion
Fe, Iron (wt.%) 25.75 0.735 25.35 26.15 4-Acid Digestion
Ga, Gallium (ppm) 3.93 0.286 3.56 4.30 4-Acid Digestion
Gd, Gadolinium (ppm) 1.32 0.21 1.12 1.53 4-Acid Digestion
Hf, Hafnium (ppm) 0.71 0.09 0.63 0.79 4-Acid Digestion
Ho, Holmium (ppm) 0.19 0.018 0.17 0.21 4-Acid Digestion
In, Indium (ppm) 1.54 0.115 1.42 1.66 4-Acid Digestion
K, Potassium (wt.%) 0.634 0.023 0.618 0.650 4-Acid Digestion
La, Lanthanum (ppm) 10.3 0.45 10.0 10.7 4-Acid Digestion
Lu, Lutetium (ppm) 0.083 0.012 0.069 0.098 4-Acid Digestion
Mg, Magnesium (wt.%) 0.301 0.017 0.289 0.313 4-Acid Digestion
Mn, Manganese (wt.%) 0.008 0.001 0.007 0.009 4-Acid Digestion
Mo, Molybdenum (ppm) 2535 196 2406 2665 4-Acid Digestion
Na, Sodium (wt.%) 0.357 0.009 0.352 0.362 4-Acid Digestion
Nb, Niobium (ppm) 2.10 0.178 1.98 2.22 4-Acid Digestion
Nd, Neodymium (ppm) 7.55 0.325 7.17 7.93 4-Acid Digestion
Ni, Nickel (ppm) 52 6 49 55 4-Acid Digestion
P, Phosphorus (wt.%) 0.014 0.003 0.012 0.016 4-Acid Digestion
Pb, Lead (ppm) 230 17 221 239 4-Acid Digestion
Pr, Praseodymium (ppm) 1.98 0.081 1.88 2.07 4-Acid Digestion
Rb, Rubidium (ppm) 20.0 1.50 18.6 21.5 4-Acid Digestion
Re, Rhenium (ppm) 6.15 0.65 5.49 6.81 4-Acid Digestion
S, Sulphur (wt.%) 30.18 1.309 28.80 31.56 4-Acid Digestion
Sb, Antimony (ppm) 55 8 49 60 4-Acid Digestion
Sc, Scandium (ppm) 4.94 0.369 4.75 5.13 4-Acid Digestion
Se, Selenium (ppm) 194 17 182 207 4-Acid Digestion
Sm, Samarium (ppm) 1.52 0.126 1.38 1.66 4-Acid Digestion
Sn, Tin (ppm) 1.64 0.35 1.53 1.75 4-Acid Digestion
Sr, Strontium (ppm) 149 7 144 155 4-Acid Digestion
Ta, Tantalum (ppm) 0.099 0.019 0.077 0.121 4-Acid Digestion
Tb, Terbium (ppm) 0.17 0.02 0.15 0.18 4-Acid Digestion
Te, Tellurium (ppm) 12.7 1.7 10.9 14.5 4-Acid Digestion
Th, Thorium (ppm) 2.44 0.208 2.22 2.66 4-Acid Digestion
Ti, Titanium (wt.%) 0.105 0.005 0.102 0.108 4-Acid Digestion
Tl, Thallium (ppm) 0.52 0.13 0.44 0.61 4-Acid Digestion
Tm, Thulium (ppm) 0.075 0.019 0.060 0.090 4-Acid Digestion
U, Uranium (ppm) 0.86 0.059 0.81 0.91 4-Acid Digestion
V, Vanadium (ppm) 45.8 4.6 42.0 49.7 4-Acid Digestion
W, Tungsten (ppm) 2.95 0.42 2.44 3.47 4-Acid Digestion
Y, Yttrium (ppm) 5.41 0.332 5.13 5.69 4-Acid Digestion
Yb, Ytterbium (ppm) 0.53 0.11 0.46 0.59 4-Acid Digestion
Zn, Zinc (ppm) 885 43 865 906 4-Acid Digestion
Zr, Zirconium (ppm) 24.9 1.12 24.4 25.3 4-Acid Digestion
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