Description
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AMIS0693 Au 1.9g/t U 583ppm Wits South Africa
Origin of Material
This standard is made from uranium bearing gold ore originating from the Vaal Reef of the Witwatersrand Gold 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).
Summary Statistics
Recommended Concentrations and Limits
(at two Standard Deviations)
Certified Concentrations
Analyte Method 7 (µ) 9 (2s) ± Unit
Au 1Pb Collection 1.91 0.23 g/t
U 2XRF 583 30 ppm
C 3Combustion/LECO 5178 647 ppm
S 44A_MICP 0.4 0.02 %
LOI 5LOI 2.76 0.32 %
SG 6SG 2.75 0.073 Dimensionless
As 4A_MICP 72 18 ppm
Ba 4A_MICP 261 17 ppm
Be 4A_MICP 3 0.2 ppm
Ca 4A_MICP 1.72 0.18 %
Ce 4A_MICP 97 11 ppm
Cs 4A_MICP 4 0.3 ppm
Cu 4A_MICP 76 6 ppm
Fe 7FUS 1.65 0.15 %
K 4A_MICP 2.50 0.17 %
La 4A_MICP 50 10 ppm
Li 4A_MICP 16 3 ppm
Mg 4A_MICP 4313 574 ppm
Mn 4A_MICP 224 37 ppm
Mo 4A_MICP 33 4 ppm
Na 4A_MICP 9475 474 ppm
Ni 4A_MICP 67 12 ppm
Sn 4A_MICP 2 0.7 ppm
Th 4A_MICP 68 5 ppm
Ti FUS 1654 97 ppm
V 4A_MICP 67 16 ppm
W 4A_MICP 7 0.9 ppm
Y 4A_MICP 36 6 ppm
Zn 4A_MICP 79 14 ppm
Major Oxides
Certified Concentrations (at two Standard Deviations)
Analyte Method 8(µ) 11 ± (2s) Unit
U3O8 XRF 0.07 0.003 %
Al2O3 XRF 12.14 0.26 %
CaO XRF 2.33 0.070 %
Fe2O3 FUS 2.36 0.21 %
Fe2O3 XRF 2.37 0.062 %
K2O XRF 3.11 0.14 %
MgO XRF 0.8 0.02 %
SiO2 XRF 73.17 1.1 %
TiO2 FUS 0.3 0.02 %
TiO2 XRF 0.3 0.03 %
