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
Au FA_GRAV 4.44 0.39 g/t
Au Pb Collection 4.19 0.72 g/t
U 4A_MICP 18 7 ppm
C Combustion/LECO 2816 351 ppm
S Combustion/LECO 0.53 0.015 %
S 4A_MICP 0.55 0.018 %
SG SG 2.73 0.15 Dimensionless
Ag 4A_MICP 0.5 0.3 ppm
Al 4A_MICP 4.09 0.21 %
As 4A_MICP 55 5 ppm
Ba 4A_MICP 206 21 ppm
Be 4A_MICP 0.7 0.2 ppm
Bi 4A_MICP 0.7 0.1 ppm
Ca 4A_MICP 8896 778 ppm
Cd 4A_MICP 0.09 0.05 ppm
Ce 4A_MICP 37 7 ppm
Co 4A_MICP 39 5 ppm
Cr 4A_MICP 481 62 ppm
Cs 4A_MICP 2 0.3 ppm
Cu 4A_MICP 62 8 ppm
Dy 4A_MICP 2 0.6 ppm
Er 4A_MICP 1 0.2 ppm
Eu 4A_MICP 0.7 0.1 ppm
Fe 4A_MICP 4.31 0.36 %
Ga 4A_MICP 10 1 ppm
Gd 4A_MICP 3 0.5 ppm
Ge 4A_MICP 0.07 0.06 ppm
Hf 4A_MICP 2 0.6 ppm
Ho 4A_MICP 0.4 0.07 ppm
In 4A_MICP 0.02 0.01 ppm
K 4A_MICP 1.14 0.11 %
La 4A_MICP 20 2 ppm
Li 4A_MICP 21 2 ppm
Mg 4A_MICP 1.92 0.11 %
Mn 4A_MICP 493 45 ppm
Mo 4A_MICP 2 0.2 ppm
Na 4A_MICP 827 118 ppm
Nb 4A_MICP 5 0.9 ppm
Nd 4A_MICP 16 2 ppm
Ni 4A_MICP 255 41 ppm
P 4A_MICP 186 10 ppm
Pb 4A_MICP 24 5 ppm
Pr 4A_MICP 5 0.3 ppm
Rb 4A_MICP 49 4 ppm
Sb 4A_MICP 1 0.2 ppm
Sc 4A_MICP 9 1 ppm
Se 4A_MICP 0.7 0.5 ppm
Sm 4A_MICP 3 0.4 ppm
Sn 4A_MICP 1 0.5 ppm
Sr 4A_MICP 27 8 ppm
Ta 4A_MICP 2 0.5 ppm
Th 4A_MICP 5 0.7 ppm
Tl 4A_MICP 0.3 0.07 ppm
Tm 4A_MICP 0.1 0.03 ppm
V 4A_MICP 63 5 ppm
W 4A_MICP 0.5 0.3 ppm
Y 4A_MICP 9 2 ppm
Yb 4A_MICP 1 0.4 ppm
Zn 4A_MICP 58 9 ppm
Major Oxides
Certified Concentrations (at two Standard Deviations)
Al2O3 XRF 7.82 0.15 %
CaO XRF 1.29 0.099 %
Cr2O3 XRF 0.080 0.005 %
Fe2O3 XRF 6.42 0.23 %
K2O XRF 1.38 0.053 %
MgO XRF 3.26 0.091 %
MnO XRF 0.063 0.01 %
P2O5 XRF 0.040 0.0008 %
SiO2 XRF 75.12 1.5 %
SO3 XRF 1.34 0.17 %
TiO2 XRF 0.38 0.02 %
