Description
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AMIS0523 Au 0.078g/t U 10ppm 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
Analyte Method Certified (µ) 9Two Standard Deviation (2s) ± Unit
Au Pb Collection1 0.078 0.02 g/t
U 4A_MICP2 10 0.6 ppm
U3O8 4A_MICP 12.3 0.76 ppm
SG SG3 2.72 0.15 Dimensionless
LOI LOI4 1.49 0.19 %
S Combustion/LECO5 0.408 0.060 %
S 4A_MICP 0.386 0.033 %
Al 4A_MICP 3.99 0.37 %
As 4A_MICP 55 8 ppm
Ba 4A_MICP 229 24 ppm
Be 4A_MICP 1 0.3 ppm
Bi 4A_MICP 1 0.1 ppm
Co 4A_MICP 20 2 ppm
Cs 4A_MICP 2 0.4 ppm
Cu 4A_MICP 35 5 ppm
Fe 4A_MICP 1.00 0.067 %
Ga 4A_MICP 8 2 ppm
Hf 4A_MICP 2 1 ppm
K 4A_MICP 1.19 0.053 %
La 4A_MICP 19 1 ppm
Li 4A_MICP 5 1 ppm
Lu 4A_MICP 0.1 0.03 ppm
Mg 4A_MICP 2978 452 ppm
Mn 4A_MICP 105 10 ppm
Mo 4A_MICP 2 1 ppm
Nb 4A_MICP 3 1 ppm
Ni 4A_MICP 85 8 ppm
Pb 4A_MICP 16 2 ppm
Rb 4A_MICP 47 6 ppm
Sb 4A_MICP 1 0.1 ppm
Sc 4A_MICP 4 1 ppm
Sn 4A_MICP 1 1 ppm
Sr 4A_MICP 21 5 ppm
Ta 4A_MICP 0.4 0.2 ppm
Tb 4A_MICP 0.2 0.1 ppm
Th 4A_MICP 5 2 ppm
Tl 4A_MICP 0.4 0.1 ppm
V 4A_MICP 26 2 ppm
W 4A_MICP 1 0.4 ppm
Yb 4A_MICP 1 0.2 ppm
Zn 4A_MICP 20 5 ppm
Zr 4A_MICP 54 9 ppm
Major Oxides
Certified Concentrations (at two Standard Deviations)
Analyte Method Certified (µ) Two Standard Deviation (2s) ± Unit
Al2O3 XRF6 7.54 0.11 %
CaO XRF 0.171 0.022 %
Cr2O3 XRF 0.119 0.016 %
Fe2O3 XRF 1.42 0.014 %
K2O XRF 1.43 0.032 %
MgO XRF 0.51 0.03 %
Na2O XRF 0.12 0.02 %
SiO2 XRF 86.63 0.550 %
SO3 XRF 0.956 0.140 %
TiO2 XRF 0.187 0.0087 %
