Description
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AMIS0705 Au 12.91g/t U 97ppm Wits South Africa
Origin of Material
The standard was made using material from the Ventersdorp Contact Reef of the Witwatersrand Basin.
Approximate Mineral and Chemical Composition
Throughout the Witwatersrand, gold ores occur in sheets or reefs originally deposited horizontally under water. The thickness of the reefs range between a lie of grit to several meters, with an average of 300mm. The sediments were also intersected by dykes and sills of dolomite, diabase and syenite intruding existing faults. The reefs can be in the form of either course conglomerates, rock pebbles and cemented in a silicate matrix. Pebbles usually derived from vein quarts, may also consist of quarzitic, chert jasper and quartz porphyry. The matrix consists of pure silica, but also contains minute flakes of muscovite and pyrophyllite as well as visible pyrite and other sulphides. The gold is usually confined to the matrix and tends to be concentrated along bedding planes (Vermeulen, 2001).
Recommended Concentrations and Limits
(at two Standard Deviations)
Certified Concentrations
Analyte Method 6(µ) 8(2s) ± Unit
Au 1Pb Collection 12.91 1.6 g/t
U 24A_MICP 97 10 ppm
U 3XRF 102 14 ppm
S 4A_MICP 1.10 0.059 %
S 4Combustion/LECO 1.09 0.071 %
SG 5SG 2.73 0.19 Dimensionless
Ag 4A_MICP 2 0.3 ppm
Al 4A_MICP 1.09 0.075 %
As 4A_MICP 81 5 ppm
Ba 4A_MICP 156 10 ppm
Be 4A_MICP 0.3 0.08 ppm
Bi 4A_MICP 1 0.2 ppm
Ca 4A_MICP 2459 204 ppm
Cd 4A_MICP 0.3 0.03 ppm
Ce 4A_MICP 42 2 ppm
Co 4A_MICP 38 3 ppm
Cr 4A_MICP 466 28 ppm
Cs 4A_MICP 0.7 0.06 ppm
Cu 4A_MICP 65 4 ppm
Fe 4A_MICP 2.84 0.12 %
Ga 4A_MICP 3 0.6 ppm
Hf 4A_MICP 2 0.1 ppm
K 4A_MICP 3281 137 ppm
La 4A_MICP 21 1 ppm
Li 4A_MICP 7 0.7 ppm
Mg 4A_MICP 3198 112 ppm
Mn 4A_MICP 214 15 ppm
Mo 4A_MICP 7 0.4 ppm
Nb 4A_MICP 3 0.5 ppm
Ni 4A_MICP 102 5 ppm
P 4A_MICP 87 19 ppm
Pb 4A_MICP 129 8 ppm
Rb 4A_MICP 19 2 ppm
Sb 4A_MICP 2 0.3 ppm
Sc 4A_MICP 3 0.4 ppm
Se 4A_MICP 0.9 0.5 ppm
Sn 4A_MICP 1 0.08 ppm
Sr 4A_MICP 15 1 ppm
Ta 4A_MICP 1 0.2 ppm
Th 4A_MICP 13 1 ppm
Ti 4A_MICP 880 131 ppm
Tl 4A_MICP 0.1 0.05 ppm
V 4A_MICP 23 2 ppm
W 4A_MICP 0.5 0.07 ppm
Y 4A_MICP 9 1 ppm
Zn 4A_MICP 71 3 ppm
Zr 4A_MICP 57 4 ppm
