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 Pb Collection 5.53 0.53 g/t
U 4A_MICP 19 2 ppm
S Combustion/LECO 0.68 0.03 %
S 4A_MICP 0.65 0.02 %
LOI LOI 1.84 0.20 %
SG SG 2.82 0.14 Dimensionless
Ag 4A_MICP 0.8 0.3 ppm
Ba 4A_MICP 231 16 ppm
Be 4A_MICP 0.5 0.04 ppm
Bi 4A_MICP 0.8 0.1 ppm
Ca 4A_MICP 8594 488 ppm
Ce 4A_MICP 28 1 ppm
Co 4A_MICP 29 1 ppm
Cu 4A_MICP 58 4 ppm
Fe 4A_MICP 3.08 0.24 %
Ga 4A_MICP 7 1 ppm
Hf 4A_MICP 2 0.2 ppm
In 4A_MICP 0.03 0.006 ppm
K 4A_MICP 8964 1385 ppm
La 4A_MICP 14 1 ppm
Li 4A_MICP 12 2 ppm
Mg 4A_MICP 1.12 0.15 %
Mn 4A_MICP 369 64 ppm
Mo 4A_MICP 2 0.1 ppm
Na 4A_MICP 2520 392 ppm
Nb 4A_MICP 6 0.5 ppm
Ni 4A_MICP 142 22 ppm
P 4A_MICP 180 28 ppm
Pb 4A_MICP 67 12 ppm
Rb 4A_MICP 43 2 ppm
Sb 4A_MICP 0.6 0.07 ppm
Sc 4A_MICP 6 0.3 ppm
Sn 4A_MICP 2 0.7 ppm
Sr 4A_MICP 34 2 ppm
Ta 4A_MICP 4 0.8 ppm
Th 4A_MICP 6 0.3 ppm
V 4A_MICP 44 9 ppm
Y 4A_MICP 8 2 ppm
Zn 4A_MICP 94 19 ppm
Zr 4A_MICP 61 9 ppm
Major Oxides
Certified Concentrations (at two Standard Deviations)
Analyte Method 7 (µ) 9 (2s) ± Unit
U3O8 4A_MICP 0.002 0.0003 %
Al2O3 XRF 6.08 0.089 %
CaO XRF 1.22 0.020 %
Cr2O3 XRF 0.040 0.0009 %
Fe2O3 XRF 4.35 0.060 %
K2O XRF 1.07 0.051 %
MgO XRF 1.76 0.040 %
P2O5 XRF 0.042 0.004 %
SiO2 XRF 82.11 1.7 %
