Description
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Origin of Material
The standard was made using material from 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).
Summary Statistics
Recommended Concentrations and Limits
(at two Standard Deviations)
Certified Concentrations
Analyte Method Certified Value (µ) Two standard deviations (2s) ± Unit
Au Pb Collection 3.19 0.25 g/t
Au FA_GRAV 3.25 0.29 g/t
U 4A_MICP 68 7 ppm
U XRF 68 7 ppm
C Combustion/LECO 1606 264 ppm
S Combustion/LECO 0.93 0.02 %
S 4A_MICP 0.92 0.04 %
LOI LOI 1.72 0.23 %
SG SG 2.75 0.068 Dimensionless
Ag 4A_MICP 0.4 0.1 ppm
Ba 4A_MICP 82 5 ppm
Be 4A_MICP 0.5 0.09 ppm
Bi 4A_MICP 0.5 0.05 ppm
Ca 4A_MICP 1590 32 ppm
Cd 4A_MICP 0.04 0.03 ppm
Ce 4A_MICP 43 11 ppm
Co 4A_MICP 32 2 ppm
Cr 4A_MICP 309 66 ppm
Cs 4A_MICP 1 0.2 ppm
Cu 4A_MICP 119 10 ppm
Fe 4A_MICP 2.94 0.18 %
Ga 4A_MICP 7 0.9 ppm
Hf 4A_MICP 2 1 ppm
In 4A_MICP 0.02 0.003 ppm
K 4A_MICP 4843 166 ppm
La 4A_MICP 23 2 ppm
Li 4A_MICP 7 0.8 ppm
Mg 4A_MICP 2287 243 ppm
Mn 4A_MICP 184 12 ppm
Mo 4A_MICP 2 0.2 ppm
Na 4A_MICP 871 84 ppm
Ni 4A_MICP 79 4 ppm
P 4A_MICP 89 15 ppm
Pb 4A_MICP 46 9 ppm
Rb 4A_MICP 23 3 ppm
Sb 4A_MICP 5 0.4 ppm
Sc 4A_MICP 5 2 ppm
Sn 4A_MICP 1 0.5 ppm
Sr 4A_MICP 16 3 ppm
Th 4A_MICP 11 1 ppm
Tl 4A_MICP 0.2 0.07 ppm
V 4A_MICP 32 8 ppm
W 4A_MICP 0.8 0.3 ppm
Y 4A_MICP 7 3 ppm
Yb 4A_MICP 0.8 0.3 ppm
Zn 4A_MICP 23 3 ppm
Major Oxides
Certified Concentrations (at two Standard Deviations)
Analyte Method Certified Value (µ) Two standard deviations (2s) ± Unit
Al2O3 XRF 5.43 0.21 %
MgO XRF 0.41 0.02 %
SiO2 XRF 85.04 1.7 %
