OREAS 27

OREAS 27 has been prepared from rhyodacite material from a quarry approximately 30km east of melbourne. It is characterised by extremely low background gold of less than 1 parts per billion. Seven commercial analytical laboratories participated in the program to characterise (in addition to gold by fire assay) Ag, Al, As, Ba, Be, Bi, Ca, Cd, Co, Cr, Cu, Fe, Hf, K, Li, Mg, Mn, Mo, Na, Nb, Ni, P, Pb, Rb, Sb, Sc, Sn, Sr, Ta, Th, Ti, Tl, U, V, W, Y, Zn and Zr by 4-acid digestion with ICP-OES or ICP-MS finish.
Analyte Certified Value 1SD 95% Confidence Limits Low 95% Confidence Limits High Method
Au, Gold (ppb) < 1 IND IND IND Pb Fire Assay
Cu, Copper (ppm) 4.61 1.08 3.48 5.74 4-Acid Digestion
Pb, Lead (ppm) 25.0 1.89 23.5 26.6 4-Acid Digestion
Ag, Silver (ppm) 0.219 0.050 0.179 0.258 4-Acid Digestion
Al, Aluminium (wt.%) 7.14 0.448 6.60 7.67 4-Acid Digestion
As, Arsenic (ppm) 4.33 0.65 3.88 4.77 4-Acid Digestion
Ba, Barium (ppm) 2988 126 2879 3097 4-Acid Digestion
Be, Beryllium (ppm) 3.04 0.151 2.89 3.19 4-Acid Digestion
Bi, Bismuth (ppm) 0.090 0.020 0.079 0.101 4-Acid Digestion
Ca, Calcium (wt.%) 1.31 0.110 1.21 1.41 4-Acid Digestion
Cd, Cadmium (ppm) 0.41 0.05 0.38 0.43 4-Acid Digestion
Co, Cobalt (ppm) 1.74 0.169 1.59 1.90 4-Acid Digestion
Cr, Chromium (ppm) 79 13 63 96 4-Acid Digestion
Fe, Iron (wt.%) 2.43 0.141 2.30 2.57 4-Acid Digestion
Hf, Hafnium (ppm) 7.59 0.557 6.89 8.29 4-Acid Digestion
K, Potassium (wt.%) 3.21 0.114 3.06 3.36 4-Acid Digestion
Li, Lithium (ppm) 20.9 1.74 19.0 22.7 4-Acid Digestion
Mg, Magnesium (wt.%) 0.118 0.006 0.114 0.123 4-Acid Digestion
Mn, Manganese (wt.%) 0.033 0.004 0.029 0.037 4-Acid Digestion
Mo, Molybdenum (ppm) 10.2 3.7 7.3 13.1 4-Acid Digestion
Na, Sodium (wt.%) 2.84 0.172 2.60 3.08 4-Acid Digestion
Nb, Niobium (ppm) 20.1 2.7 16.6 23.6 4-Acid Digestion
Ni, Nickel (ppm) < 4.00 IND IND IND 4-Acid Digestion
P, Phosphorus (wt.%) 0.027 0.002 0.024 0.029 4-Acid Digestion
Rb, Rubidium (ppm) 144 9 133 154 4-Acid Digestion
Sb, Antimony (ppm) 1.19 0.098 1.11 1.27 4-Acid Digestion
Sc, Scandium (ppm) 4.06 0.300 3.70 4.42 4-Acid Digestion
Sn, Tin (ppm) 4.06 0.212 3.84 4.28 4-Acid Digestion
Sr, Strontium (ppm) 191 5 186 195 4-Acid Digestion
Ta, Tantalum (ppm) 1.53 0.22 1.23 1.83 4-Acid Digestion
Th, Thorium (ppm) 15.1 1.5 13.7 16.4 4-Acid Digestion
Ti, Titanium (wt.%) 0.110 0.004 0.105 0.114 4-Acid Digestion
Tl, Thallium (ppm) 0.75 0.058 0.68 0.82 4-Acid Digestion
U, Uranium (ppm) 5.54 0.328 5.28 5.81 4-Acid Digestion
V, Vanadium (ppm) 3.33 0.47 2.75 3.92 4-Acid Digestion
W, Tungsten (ppm) 1.82 0.28 1.66 1.97 4-Acid Digestion
Y, Yttrium (ppm) 15.1 1.46 13.4 16.8 4-Acid Digestion
Zn, Zinc (ppm) 117 5 112 121 4-Acid Digestion
Zr, Zirconium (ppm) 278 20 251 305 4-Acid Digestion
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Specifications