OREAS 22d

OREAS 22d has been prepared from quartz sand to which 0.5% iron oxide has been added to produce a pale grey pulp. 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, Bi, Cd, Co, Cu, Fe, Hf, Li, Mn, Mo, Nb, Ni, Rb, Sb, Sn, Th, Ti, U, V, W, Y, Zn and Zr by 4-acid digestion with ICP-OES or ICP-MS finish.
Analyte Certified Value 1SD 95% Confidence Low 95% Confidence High Method
Au, Gold (ppb) < 1 IND IND IND Pb Fire Assay
Cu, Copper (ppm) 9.23 1.34 7.85 10.61 4-Acid Digestion
Ag, Silver (ppm) < 0.100 IND IND IND 4-Acid Digestion
Al, Aluminium (wt.%) 0.132 0.008 0.123 0.142 4-Acid Digestion
As, Arsenic (ppm) < 1.00 IND IND IND 4-Acid Digestion
Ba, Barium (ppm) 6.17 0.63 5.66 6.67 4-Acid Digestion
Bi, Bismuth (ppm) < 0.10 IND IND IND 4-Acid Digestion
Cd, Cadmium (ppm) < 0.10 IND IND IND 4-Acid Digestion
Co, Cobalt (ppm) 0.85 0.071 0.77 0.93 4-Acid Digestion
Fe, Iron (wt.%) 0.468 0.037 0.432 0.504 4-Acid Digestion
Hf, Hafnium (ppm) 0.22 0.03 0.19 0.24 4-Acid Digestion
Li, Lithium (ppm) 14.2 1.33 12.5 16.0 4-Acid Digestion
Mn, Manganese (wt.%) 0.011 0.001 0.009 0.013 4-Acid Digestion
Mo, Molybdenum (ppm) 2.36 0.086 2.28 2.44 4-Acid Digestion
Nb, Niobium (ppm) 0.88 0.081 0.79 0.97 4-Acid Digestion
Ni, Nickel (ppm) 4.38 0.63 4.05 4.70 4-Acid Digestion
Pb, Lead (ppm) 0.72 0.26 0.49 0.95 4-Acid Digestion
Rb, Rubidium (ppm) 0.54 0.06 0.49 0.59 4-Acid Digestion
Sb, Antimony (ppm) 0.21 0.03 0.19 0.22 4-Acid Digestion
Sn, Tin (ppm) 0.61 0.013 0.59 0.62 4-Acid Digestion
Th, Thorium (ppm) 0.67 0.10 0.55 0.78 4-Acid Digestion
Ti, Titanium (wt.%) 0.021 0.001 0.021 0.022 4-Acid Digestion
U, Uranium (ppm) 0.18 0.05 0.13 0.22 4-Acid Digestion
V, Vanadium (ppm) 2.63 0.50 2.12 3.15 4-Acid Digestion
W, Tungsten (ppm) 0.21 0.03 0.18 0.24 4-Acid Digestion
Y, Yttrium (ppm) 0.69 0.07 0.61 0.76 4-Acid Digestion
Zn, Zinc (ppm) 6.70 1.31 5.59 7.81 4-Acid Digestion
Zr, Zirconium (ppm) 7.02 0.600 6.31 7.73 4-Acid Digestion
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