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 17.68 1.1 g/t
Au FA_GRAV 17.41 0.81 g/t
U 4A_MICP 702 37 ppm
U XRF 700 17 ppm
C Combustion/LECO 1543 245 ppm
S Combustion/LECO 3.43 0.14 %
S 4A_MICP 3.35 0.16 %
LOI LOI 3.61 0.40 %
LOI XRF 3.43 0.10 %
SG SG 2.86 0.25 Dimensionless
Ag 4A_MICP 2 0.6 ppm
Al 4A_MICP 1.81 0.17 %
As 4A_MICP 306 21 ppm
Ba 4A_MICP 93 3 ppm
Be 4A_MICP 0.6 0.1 ppm
Bi 4A_MICP 2 0.5 ppm
Ca 4A_MICP 683 63 ppm
Cd 4A_MICP 0.2 0.02 ppm
Ce 4A_MICP 84 10 ppm
Co 4A_MICP 115 14 ppm
Cs 4A_MICP 1 0.3 ppm
Cu 4A_MICP 145 8 ppm
Dy 4A_MICP 6 1 ppm
Er 4A_MICP 3 0.7 ppm
Eu 4A_MICP 1 0.3 ppm
Fe 4A_MICP 4.77 0.35 %
Ga 4A_MICP 5 2 ppm
Gd 4A_MICP 6 2 ppm
Ho 4A_MICP 1 0.2 ppm
In 4A_MICP 0.04 0.02 ppm
K 4A_MICP 4444 172 ppm
La 4A_MICP 45 5 ppm
Li 4A_MICP 7 2 ppm
Mg 4A_MICP 1155 84 ppm
Mn 4A_MICP 142 9 ppm
Mo 4A_MICP 3 0.4 ppm
Na 4A_MICP 724 123 ppm
Nd 4A_MICP 31 5 ppm
Ni 4A_MICP 190 26 ppm
P 4A_MICP 118 22 ppm
Pb 4A_MICP 359 10 ppm
Pr 4A_MICP 10 0.8 ppm
Rb 4A_MICP 19 4 ppm
Re 4A_MICP 0.002 0.001 ppm
Sb 4A_MICP 9 1 ppm
Sc 4A_MICP 5 2 ppm
Sm 4A_MICP 7 1 ppm
Sn 4A_MICP 2 0.4 ppm
Sr 4A_MICP 18 0.7 ppm
Ta 4A_MICP 2 0.6 ppm
Tb 4A_MICP 1 0.2 ppm
Te 4A_MICP 0.2 0.09 ppm
Th 4A_MICP 64 14 ppm
Tl 4A_MICP 0.3 0.07 ppm
Tm 4A_MICP 0.4 0.1 ppm
V 4A_MICP 22 6 ppm
W 4A_MICP 0.8 0.3 ppm
Y 4A_MICP 21 5 ppm
Yb 4A_MICP 2 0.5 ppm
Zn 4A_MICP 49 4 ppm
Zr 4A_MICP 143 32 ppm
Major Oxides
Certified Concentrations (at two Standard Deviations)
Analyte Method Certified Value (µ) Two standard deviations (2s) ± Unit
U3O8 4A_MICP 0.083 0.004 %
U3O8 XRF 0.083 0.002 %
Al2O3 XRF 3.49 0.38 %
Cr2O3 XRF 0.095 0.02 %
Fe2O3 XRF 6.83 0.45 %
K2O XRF 0.54 0.05 %
