OREAS 354

OREAS 354 is a certified reference material (CRM) sourced from zinc sulphide concentrate samples taken from the Dugald River metallurgical plant. The Dugald River deposit is located in the Mt Isa Inlier, ~65km north-west of Cloncurry in north-west Queensland, Australia. The mineralisation style is dominated by sphalerite and galena with a gangue of graphitic slate, pyrrhotite and pyrite. The deposit is hosted within a sequence of upper greenschist to amphibolite facies metamorphic rocks consisting quartzite, schists, slates and dolomite.

Thirteen umpire laboratories determined Zinc in 3 trials by classical wet chemistry methods. Twelve geoanalytical laboratories also participated in the analytical program:

  • Al2O3, Ba, CaO, Cu, Fe, K2O, MgO, Mn, P2O5, Pb, S, SiO2, TiO2 & Zn by oxidising fusion with XRF finish;
  • Full elemental suites by 4-acid digestion with ICP-OES and MS finish;
  • Total C and S by IR combustion furnace;
  • Graphitic Carbon by HCl leach, with IR induction furnace finish.
Analyte Certified Value 1SD 95% Confidence Low 95% Confidence High Method
Zn, Zinc (wt.%) 49.30 0.161 49.19 49.42 Classical Wet Chemistry
Pb, Lead (wt.%) 1.58 0.071 1.54 1.61 4-Acid Digestion
Ag, Silver (ppm) 98.0 4.24 95.4 100.6 4-Acid Digestion
Al2O3, Aluminium(III) oxide (wt.%) 0.743 0.055 0.700 0.787 Oxidising Fusion XRF
Ba, Barium (ppm) 1443 171 1321 1565 Oxidising Fusion XRF
CaO, Calcium oxide (wt.%) 0.232 0.011 0.225 0.239 Oxidising Fusion XRF
Cu, Copper (ppm) 1380 93 1316 1444 Oxidising Fusion XRF
Fe, Iron (wt.%) 9.65 0.110 9.57 9.72 Oxidising Fusion XRF
K2O, Potassium oxide (wt.%) 0.440 0.012 0.432 0.449 Oxidising Fusion XRF
Mn, Manganese (wt.%) 1.52 0.029 1.50 1.54 Oxidising Fusion XRF
Pb, Lead (wt.%) 1.55 0.091 1.49 1.61 Oxidising Fusion XRF
S, Sulphur (wt.%) 31.36 0.519 30.83 31.88 Oxidising Fusion XRF
SiO2, Silicon dioxide (wt.%) 3.36 0.074 3.30 3.42 Oxidising Fusion XRF
TiO2, Titanium dioxide (wt.%) 0.057 0.019 0.043 0.071 Oxidising Fusion XRF
Zn, Zinc (wt.%) 49.46 0.567 49.09 49.82 Oxidising Fusion XRF
C, Carbon (wt.%) 0.526 0.026 0.518 0.535 Infrared Combustion
C-(Graphite), Carbon, graphitic (wt.%) 0.414 0.035 0.388 0.440 Infrared Combustion
S, Sulphur (wt.%) 31.49 0.808 31.05 31.94 Infrared Combustion
Al, Aluminium (wt.%) 0.411 0.021 0.396 0.426 4-Acid Digestion
Be, Beryllium (ppm) < 0.50 IND IND IND 4-Acid Digestion
Bi, Bismuth (ppm) 5.60 0.499 5.08 6.12 4-Acid Digestion
Ca, Calcium (wt.%) 0.165 0.007 0.160 0.169 4-Acid Digestion
Cd, Cadmium (ppm) 1157 35 1130 1183 4-Acid Digestion
Co, Cobalt (ppm) 9.56 0.622 8.98 10.13 4-Acid Digestion
Cr, Chromium (ppm) 6.74 1.41 5.27 8.20 4-Acid Digestion
Cu, Copper (ppm) 1387 49 1356 1419 4-Acid Digestion
Fe, Iron (wt.%) 9.82 0.330 9.60 10.03 4-Acid Digestion
Ga, Gallium (ppm) 9.85 0.351 9.52 10.17 4-Acid Digestion
K, Potassium (wt.%) 0.354 0.017 0.341 0.366 4-Acid Digestion
Mg, Magnesium (wt.%) 0.054 0.006 0.050 0.057 4-Acid Digestion
Mn, Manganese (wt.%) 1.54 0.074 1.49 1.59 4-Acid Digestion
Mo, Molybdenum (ppm) 2.37 0.24 2.15 2.60 4-Acid Digestion
Na, Sodium (wt.%) 0.019 0.003 0.017 0.021 4-Acid Digestion
Nb, Niobium (ppm) 1.06 0.31 0.66 1.47 4-Acid Digestion
Ni, Nickel (ppm) 10.9 1.4 10.1 11.7 4-Acid Digestion
P, Phosphorus (wt.%) 0.006 0.001 0.005 0.007 4-Acid Digestion
S, Sulphur (wt.%) 26.63 4.087 23.36 29.90 4-Acid Digestion
Sb, Antimony (ppm) 51 8 44 57 4-Acid Digestion
Sc, Scandium (ppm) < 1.00 IND IND IND 4-Acid Digestion
Sn, Tin (ppm) 3.83 0.74 3.03 4.64 4-Acid Digestion
Sr, Strontium (ppm) 42.6 4.6 39.4 45.8 4-Acid Digestion
Ti, Titanium (wt.%) 0.025 0.004 0.022 0.027 4-Acid Digestion
U, Uranium (ppm) 4.42 0.411 3.88 4.95 4-Acid Digestion
V, Vanadium (ppm) 9.12 1.51 8.00 10.24 4-Acid Digestion
Y, Yttrium (ppm) 2.99 0.230 2.71 3.27 4-Acid Digestion
Zn, Zinc (wt.%) 49.77 2.271 46.72 52.82 4-Acid Digestion
Zr, Zirconium (ppm) 9.95 1.17 8.44 11.46 4-Acid Digestion
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