Description
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AMIS0721 Au 8.32g/t U 101ppm 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 8.32 0.50 g/t
U 24A_MICP 101 17 ppm
U 3XRF 106 16 ppm
S 4A_MICP 1.26 0.056 %
S 4Combustion/LECO 1.26 0.073 %
SG 5SG 2.75 0.18 Dimensionless
Ag 4A_MICP 1 0.3 ppm
Al 4A_MICP 1.43 0.064 %
As 4A_MICP 79 13 ppm
Ba 4A_MICP 249 8 ppm
Be 4A_MICP 0.5 0.08 ppm
Bi 4A_MICP 2 0.4 ppm
Ca 4A_MICP 2999 191 ppm
Cd 4A_MICP 0.5 0.07 ppm
Ce 4A_MICP 40 2 ppm
Co 4A_MICP 44 3 ppm
Cr 4A_MICP 450 39 ppm
Cs 4A_MICP 1 0.09 ppm
Cu 4A_MICP 111 7 ppm
Fe 4A_MICP 3.39 0.071 %
Ga 4A_MICP 4 0.4 ppm
Hf 4A_MICP 1 0.1 ppm
K 4A_MICP 5066 291 ppm
La 4A_MICP 20 1 ppm
Li 4A_MICP 9 0.9 ppm
Mg 4A_MICP 4029 251 ppm
Mn 4A_MICP 256 16 ppm
Mo 4A_MICP 10 0.6 ppm
Na 4A_MICP 410 42 ppm
Nb 4A_MICP 3 0.4 ppm
Ni 4A_MICP 106 5 ppm
P 4A_MICP 94 13 ppm
Pb 4A_MICP 197 7 ppm
Rb 4A_MICP 30 2 ppm
Sb 4A_MICP 1 0.2 ppm
Sc 4A_MICP 3 0.3 ppm
Sr 4A_MICP 15 0.9 ppm
Ta 4A_MICP 1 0.2 ppm
Th 4A_MICP 14 2 ppm
Ti 4A_MICP 603 12 ppm
Tl 4A_MICP 0.2 0.02 ppm
V 4A_MICP 29 3 ppm
Y 4A_MICP 10 1 ppm
Zn 4A_MICP 112 5 ppm
Zr 4A_MICP 39 14 ppm
