OREAS 245

OREAS 245 was prepared from a blend of high grade gold-bearing ore and barren metasediments. The gold ore was sourced from the central Victorian goldfields and is hosted within a metamorphosed turbidite sequence of interbedded sandstones, siltstones and shales. Gold mineralisation mainly occurs within disseminated arsenopyrite and pyrite ± stibnite-quartz zones.

Thirty-five commercial analytical laboratories participated in the program to certify:

  • Gold by fire assay;
  • Full ICP-OES and ICP-MS elemental suites by 4-acid digestion.
Analyte Certified Value 1SD 95% Confidence Low 95% Confidence High Method
Au, Gold (ppm) 25.73 0.546 25.55 25.91 Pb Fire Assay
Ag, Silver (ppm) 1.44 0.071 1.42 1.47 4-Acid Digestion
Al, Aluminium (wt.%) 6.24 0.166 6.17 6.30 4-Acid Digestion
As, Arsenic (ppm) 3778 212 3668 3889 4-Acid Digestion
Ba, Barium (ppm) 549 15 543 555 4-Acid Digestion
Be, Beryllium (ppm) 2.34 0.128 2.28 2.40 4-Acid Digestion
Bi, Bismuth (ppm) 0.70 0.041 0.68 0.73 4-Acid Digestion
Ca, Calcium (wt.%) 0.814 0.027 0.803 0.825 4-Acid Digestion
Cd, Cadmium (ppm) 0.075 0.020 0.065 0.086 4-Acid Digestion
Ce, Cerium (ppm) 66 4.1 64 68 4-Acid Digestion
Co, Cobalt (ppm) 13.0 0.74 12.6 13.3 4-Acid Digestion
Cr, Chromium (ppm) 103 9 98 107 4-Acid Digestion
Cs, Caesium (ppm) 8.71 0.497 8.50 8.92 4-Acid Digestion
Cu, Copper (ppm) 56 3.0 54 57 4-Acid Digestion
Dy, Dysprosium (ppm) 2.74 0.52 2.40 3.09 4-Acid Digestion
Er, Erbium (ppm) 1.43 0.22 1.29 1.56 4-Acid Digestion
Eu, Europium (ppm) 1.00 0.087 0.95 1.05 4-Acid Digestion
Fe, Iron (wt.%) 3.45 0.107 3.41 3.49 4-Acid Digestion
Ga, Gallium (ppm) 17.0 0.98 16.5 17.4 4-Acid Digestion
Gd, Gadolinium (ppm) 4.20 0.44 3.94 4.46 4-Acid Digestion
Hf, Hafnium (ppm) 3.15 0.232 3.04 3.25 4-Acid Digestion
Ho, Holmium (ppm) 0.52 0.07 0.46 0.58 4-Acid Digestion
In, Indium (ppm) 0.059 0.008 0.056 0.063 4-Acid Digestion
K, Potassium (wt.%) 2.55 0.103 2.50 2.59 4-Acid Digestion
La, Lanthanum (ppm) 32.6 2.26 31.7 33.6 4-Acid Digestion
Li, Lithium (ppm) 38.0 2.18 37.1 38.9 4-Acid Digestion
Lu, Lutetium (ppm) 0.23 0.03 0.21 0.26 4-Acid Digestion
Mg, Magnesium (wt.%) 1.27 0.040 1.26 1.29 4-Acid Digestion
Mn, Manganese (wt.%) 0.035 0.001 0.035 0.036 4-Acid Digestion
Mo, Molybdenum (ppm) 1.43 0.138 1.38 1.48 4-Acid Digestion
Na, Sodium (wt.%) 0.483 0.024 0.472 0.494 4-Acid Digestion
Nb, Niobium (ppm) 10.7 1.3 10.0 11.3 4-Acid Digestion
Nd, Neodymium (ppm) 29.0 1.58 28.1 30.0 4-Acid Digestion
Ni, Nickel (ppm) 47.3 2.26 46.4 48.2 4-Acid Digestion
P, Phosphorus (wt.%) 0.049 0.001 0.049 0.050 4-Acid Digestion
Pb, Lead (ppm) 32.6 2.48 31.6 33.7 4-Acid Digestion
Pr, Praseodymium (ppm) 7.82 0.415 7.58 8.06 4-Acid Digestion
Rb, Rubidium (ppm) 149 6 147 152 4-Acid Digestion
Re, Rhenium (ppm) 0.002 IND IND IND 4-Acid Digestion
S, Sulphur (wt.%) 0.765 0.025 0.754 0.777 4-Acid Digestion
Sb, Antimony (ppm) 3471 145 3388 3554 4-Acid Digestion
Sc, Scandium (ppm) 11.5 0.77 11.1 11.9 4-Acid Digestion
Sm, Samarium (ppm) 5.47 0.335 5.27 5.66 4-Acid Digestion
Sn, Tin (ppm) 3.38 0.214 3.27 3.49 4-Acid Digestion
Sr, Strontium (ppm) 96 3.6 94 97 4-Acid Digestion
Ta, Tantalum (ppm) 0.86 0.082 0.81 0.90 4-Acid Digestion
Tb, Terbium (ppm) 0.51 0.037 0.49 0.54 4-Acid Digestion
Th, Thorium (ppm) 12.3 0.51 12.1 12.5 4-Acid Digestion
Ti, Titanium (wt.%) 0.350 0.023 0.340 0.360 4-Acid Digestion
Tl, Thallium (ppm) 0.82 0.054 0.79 0.84 4-Acid Digestion
Tm, Thulium (ppm) 0.22 0.03 0.19 0.25 4-Acid Digestion
U, Uranium (ppm) 2.48 0.106 2.44 2.52 4-Acid Digestion
V, Vanadium (ppm) 83 4.8 81 85 4-Acid Digestion
W, Tungsten (ppm) 6.76 1.47 6.06 7.46 4-Acid Digestion
Y, Yttrium (ppm) 12.5 1.5 11.8 13.3 4-Acid Digestion
Yb, Ytterbium (ppm) 1.48 0.20 1.36 1.60 4-Acid Digestion
Zn, Zinc (ppm) 92 3.9 91 94 4-Acid Digestion
Zr, Zirconium (ppm) 107 8 104 111 4-Acid Digestion
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CRM Group