Description
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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).
Certified Concentrations
Au Pb Collection 0.166 0.0277g/t
U 4A_MICP 46 6ppm
U XRF 51 10ppm
LOI LOI 2.11 0.25%
SG SG 2.74 0.17Dimensionless
S Combustion/LECO 0.48 0.04%
S 4A_MICP 0.49 0.06%
Ag 4A_MICP 0.1 0.04ppm
Al 4A_MICP 3.97 0.33%
As 4A_MICP 74 6ppm
Ba 4A_MICP 218 32ppm
Be 4A_MICP 0.8 0.1ppm
Bi 4A_MICP 0.6 0.09ppm
Ca 4A_MICP 3870 581ppm
Cd 4A_MICP 0.3 0.04ppm
Ce 4A_MICP 68 12ppm
Co 4A_MICP 29 3ppm
Cs 4A_MICP 2 0.4ppm
Cu 4A_MICP 52 4ppm
Fe 4A_MICP 1.85 0.13%
Ga 4A_MICP 9 0.8ppm
Hf 4A_MICP 3 0.7ppm
In 4A_MICP 0.02 0.01ppm
K 4A_MICP 8947 352ppm
La 4A_MICP 34 6ppm
Li 4A_MICP 8 2ppm
Lu 4A_MICP 0.2 0.04ppm
Mg 4A_MICP 1957 172ppm
Mn 4A_MICP 409 52ppm
Mo 4A_MICP 3 0.3ppm
Na 4A_MICP 1233 91ppm
Nb 4A_MICP 5 0.9ppm
Ni 4A_MICP 72 8ppm
P 4A_MICP 137 25ppm
Pb 4A_MICP 64 6ppm
Rb 4A_MICP 37 4ppm
Sb 4A_MICP 3 0.5ppm
Sc 4A_MICP 5 0.6ppm
Sn 4A_MICP 1 0.5ppm
Sr 4A_MICP 39 3ppm
Ta 4A_MICP 0.7 0.1ppm
Tb 4A_MICP 0.4 0.2ppm
Te 4A_MICP 0.09 0.05ppm
Th 4A_MICP 19 2ppm
Ti 4A_MICP 1049 152ppm
Tl 4A_MICP 0.3 0.05ppm
V 4A_MICP 31 5ppm
W 4A_MICP 0.6 0.1ppm
Y 4A_MICP 9 2ppm
Yb 4A_MICP 1 0.4ppm
Zn 4A_MICP 110 15ppm
Zr 4A_MICP 105 29ppm
Major Oxides
U3O8 4A_MICP 0.005 0.0007%
U3O8 XRF 0.006 0.001 %
Al2O3 XRF 7.80 0.10%
CaO XRF 0.527 0.01 %
Cr2O3 XRF 0.040 0.001 %
Fe2O3 XRF 2.64 0.073 %
K2O XRF 1.05 0.039%
MnO XRF 0.050 0.01%
Na2O XRF 0.16 0.02%
P2O5 XRF 0.032 0.004%
SiO2 XRF 84.60 1.2%
SO3 XRF 1.17 0.060%
TiO2 XRF 0.28 0.01%
