Description
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AMIS0728 Au 0.667g/t U 41ppm 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).
Certified Concentrations
Analyte Method 6(µ) ± (2s) Unit
Au 1Pb Collection 0.667 0.12 g/t
U 24A_MICP 41 4 ppm
U 3XRF 40 10 ppm
S 4A_MICP 1.43 0.12 %
S 4Combustion/LECO 1.40 0.11 %
SG 5SG 2.80 0.15 Dimensionless
Al 4A_MICP 3.21 0.20 %
As 4A_MICP 269 26 ppm
Ba 4A_MICP 88 9 ppm
Be 4A_MICP 0.4 0.1 ppm
Bi 4A_MICP 2 0.1 ppm
Ca 4A_MICP 6508 488 ppm
Cd 4A_MICP 0.3 0.07 ppm
Ce 4A_MICP 41 3 ppm
Co 4A_MICP 45 6 ppm
Cr 4A_MICP 368 42 ppm
Cs 4A_MICP 1 0.1 ppm
Cu 4A_MICP 51 6 ppm
Dy 4A_MICP 2 0.5 ppm
Er 4A_MICP 0.8 0.3 ppm
Fe 4A_MICP 2.72 0.15 %
Ga 4A_MICP 7 1 ppm
Gd 4A_MICP 2 0.4 ppm
Hf 4A_MICP 2 0.2 ppm
Ho 4A_MICP 0.3 0.09 ppm
K 4A_MICP 2890 246 ppm
La 4A_MICP 22 2 ppm
Li 4A_MICP 9 0.8 ppm
Lu 4A_MICP 0.1 0.04 ppm
Mg 4A_MICP 4374 299 ppm
Mn 4A_MICP 218 19 ppm
Mo 4A_MICP 5 0.8 ppm
Na 4A_MICP 1818 142 ppm
Nb 4A_MICP 4 0.4 ppm
Nd 4A_MICP 16 1 ppm
Ni 4A_MICP 93 7 ppm
P 4A_MICP 145 12 ppm
Pb 4A_MICP 67 7 ppm
Pr 4A_MICP 4 0.4 ppm
Rb 4A_MICP 12 0.8 ppm
Sb 4A_MICP 2 0.3 ppm
Sc 4A_MICP 5 1 ppm
Sm 4A_MICP 3 0.4 ppm
Sn 4A_MICP 1 0.4 ppm
Sr 4A_MICP 43 3 ppm
Ta 4A_MICP 1 0.2 ppm
Tb 4A_MICP 0.3 0.1 ppm
Th 4A_MICP 9 1 ppm
Ti 4A_MICP 1245 137 ppm
Tl 4A_MICP 0.2 0.02 ppm
Tm 4A_MICP 0.1 0.03 ppm
V 4A_MICP 39 6 ppm
W 4A_MICP 0.7 0.3 ppm
Y 4A_MICP 7 3 ppm
Yb 4A_MICP 0.9 0.3 ppm
Zn 4A_MICP 103 9 ppm
Zr 4A_MICP 65 9 ppm
