Description
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Origin of Material
The standard was made using material from the Ventersdorp Contact Reef of 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 line 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) 8Two standard deviations (2s) ± Unit
Au Pb Collection 30.98 1.6 g/t
U 4A_MICP 1288 230 ppm
U XRF 1271 35 ppm
S 4A_MICP 2.12 0.074 %
LOI LOI 3.59 0.45 %
SG SG 2.73 0.15 Dimensionless
Ag 4A_MICP 3 1 ppm
Al 4A_MICP 1.67 0.11 %
As 4A_MICP 486 22 ppm
Ba 4A_MICP 109 12 ppm
Be 4A_MICP 0.70 0.3 ppm
Bi 4A_MICP 3 0.3 ppm
Ca 4A_MICP 880 16 ppm
Cd 4A_MICP 1 0.4 ppm
Ce 4A_MICP 92 1 ppm
Co 4A_MICP 92 10 ppm
Cs 4A_MICP 2 0.3 ppm
Cu 4A_MICP 87 3 ppm
Dy 4A_MICP 13 3 ppm
Er 4A_MICP 7 2 ppm
Eu 4A_MICP 2 0.4 ppm
Fe 4A_MICP 3.71 0.14 %
Ga 4A_MICP 4 0.5 ppm
Gd 4A_MICP 11 3 ppm
Hf 4A_MICP 3 1 ppm
Ho 4A_MICP 2 0.5 ppm
In 4A_MICP 0.03 0.006 ppm
K 4A_MICP 4374 362 ppm
La 4A_MICP 45 4 ppm
Li 4A_MICP 8 1 ppm
Lu 4A_MICP 0.73 0.4 ppm
Mg 4A_MICP 1894 194 ppm
Mn 4A_MICP 214 12 ppm
Mo 4A_MICP 6 1 ppm
Na 4A_MICP 665 89 ppm
Nd 4A_MICP 38 1 ppm
Ni 4A_MICP 154 14 ppm
P 4A_MICP 153 16 ppm
Pb 4A_MICP 618 103 ppm
Pr 4A_MICP 9 2 ppm
Rb 4A_MICP 20 3 ppm
Re 4A_MICP 0.003 0.002 ppm
Sc 4A_MICP 3 0.3 ppm
Sm 4A_MICP 9 2 ppm
Sn 4A_MICP 2 0.6 ppm
Sr 4A_MICP 30 3 ppm
Ta 4A_MICP 3 1 ppm
Th 4A_MICP 126 20 ppm
Tl 4A_MICP 0.24 0.04 ppm
Tm 4A_MICP 0.9 0.2 ppm
V 4A_MICP 20 5 ppm
W 4A_MICP 0.90 0.1 ppm
Y 4A_MICP 54 12 ppm
Yb 4A_MICP 5 1 ppm
Zn 4A_MICP 319 47 ppm
Major Oxides
Certified Concentrations (at two Standard Deviations)
Analyte Method Certified Value (µ) Two standard deviations (2s) ± Unit
Al2O3 XRF 3.20 0.24 %
Cr2O3 XRF 0.068 0.01 %
Fe2O3 XRF 5.37 0.22 %
K2O XRF 0.51 0.02 %
SiO2 XRF 83.92 4.9 %
SO3 XRF 5.48 0.62 %
TiO2 XRF 0.19 0.02 %
