Description
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Origin of Material
Underground chip samples of Basal Reef (Witwatersrand Basin).
Approximate Mineral and Chemical Composition
Basal Reef – Two main facies have been identified, the Black Chert Facies (BCF) and the Loraine Facies (LF), where current mining only takes place in the BCF. Black Chert Facies comprises of multiple stacked, small pebble conglomerate bands. Black chert pebbles make up 25% of the rock. The gold occurs in the matrix and tends to be concentrated in carbon seams along the bottom contact of the reef band.
Recommended Concentrations and Limits (at two Standard Deviations)
Certified Concentrations
Analyte Method Certified Value (µ) Two standard deviations (2s) ± Unit
Au FA_GRAV 21.03 1.2 g/t
Au Pb Collection 21.38 2.0 g/t
U XRF 694 37 ppm
SG SG 2.77 0.058 Dimensionless
Al 4A_MICP 1.63 0.080 %
Ba 4A_MICP 88 1 ppm
Ca 4A_MICP 601 93 ppm
Fe 4A_MICP 4.67 0.46 %
Mg 4A_MICP 2893 73 ppm
Mn 4A_MICP 141 26 ppm
P 4A_MICP 114 16 ppm
V 4A_MICP 19 4 ppm
Y 4A_MICP 19 1 ppm
Zn 4A_MICP 47 12 ppm
Major Oxides Certified Concentrations (at two Standard Deviations)
Analyte Method Certified Value (µ) Two standard deviations (2s) ± Unit
U3O8 XRF 811 17 ppm
