Description
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AMIS0554 Au 7.88g/t U 115ppm Wits South Africa
Origin of Material
This standard is made from uranium bearing gold ore originating from the Ventersdorp, Contact Reef, Carbon Leader Reef and Vaal Reef. The uranium bearing ore was blended with low grade material of similar matrix to obtain the required grade.
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
Two Standard Deviation (2s) ± Unit
Au Pb Collection1 7.88 0.93 g/t
U 4A_MICP2 112 10 ppm
U XRF3 115 19 ppm
U3O8 XRF 0.014 0.002 %
C Combustion/LECO4 2408 469 ppm
S Combustion/LECO 1.14 0.085 %
SG SG5 2.75 0.050 Dimensionless
Ag 4A_MICP 1 0.30 ppm
Al 4A_MICP 13894 989 ppm
As 4A_MICP 139 16 ppm
Ba 4A_MICP 196 16 ppm
Be 4A_MICP 1 0.1 ppm
Bi 4A_MICP 2 0.4 ppm
Ca 4A_MICP 7755 687 ppm
Ce 4A_MICP 48 7 ppm
Co 4A_MICP 42 4 ppm
Cs 4A_MICP 1 0.4 ppm
Cu 4A_MICP 213 11 ppm
Dy 4A_MICP 3 0.4 ppm
Er 4A_MICP 1 0.1 ppm
Eu 4A_MICP 1 0.3 ppm
Fe 4A_MICP 33158 2194 ppm
Ga 4A_MICP 5 1 ppm
Gd 4A_MICP 4 1 ppm
Hf 4A_MICP 1 0.3 ppm
Ho 4A_MICP 0.5 0.1 ppm
K 4A_MICP 4404 243 ppm
La 4A_MICP 23 4 ppm
Li 4A_MICP 11 1 ppm
Lu 4A_MICP 0.1 0.1 ppm
Mg 4A_MICP 4989 542 ppm
Mn 4A_MICP 299 14 ppm
Mo 4A_MICP 6 1 ppm
Na 4A_MICP 493 27 ppm
Nb 4A_MICP 3 1 ppm
Nd 4A_MICP 22 4 ppm
Ni 4A_MICP 133 16 ppm
P 4A_MICP 199 19 ppm
Pb 4A_MICP 145 16 ppm
Pr 4A_MICP 5 2 ppm
Rb 4A_MICP 27 6 ppm
Sb 4A_MICP 3 1 ppm
Sc 4A_MICP 4 0.1 ppm
Sm 4A_MICP 4 0.4 ppm
Sr 4A_MICP 58 5 ppm
Tb 4A_MICP 0 0.2 ppm
Th 4A_MICP 18 4 ppm
Tl 4A_MICP 0.2 0.01 ppm
Tm 4A_MICP 0.2 0.1 ppm
V 4A_MICP 30 3 ppm
Y 4A_MICP 10 2 ppm
Yb 4A_MICP 1 0.1 ppm
Zn 4A_MICP 67 10 ppm
Zr 4A_MICP 57 9 ppm
