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.
Summary Statistics:
Certified Concentrations
Au Pb Collection 30.53 4.85 g/t
U 4A_MICP 1063 77 ppm
U XRF 1103 104 ppm
S Combustion/LECO 2.50 0.21 %
LOI LOI 2.29 0.26 %
SG SG 2.62 0.57 Dimensionless
Ag 4A_MICP 7 2 ppm
Al 4A_MICP 1.40 0.061 %
As 4A_MICP 237 19 ppm
Be 4A_MICP 0.3 0.06 ppm
Bi 4A_MICP 1 0.1 ppm
Ca 4A_MICP 1354 134 ppm
Cd 4A_MICP 0.1 0.06 ppm
Ce 4A_MICP 72 7 ppm
Co 4A_MICP 99 9 ppm
Cu 4A_MICP 67 13 ppm
Fe 4A_MICP 3.66 0.25 %
Ga 4A_MICP 4 0.6 ppm
Hf 4A_MICP 4 1 ppm
K 4A_MICP 2006 181 ppm
La 4A_MICP 37 2 ppm
Li 4A_MICP 8 2 ppm
Mg 4A_MICP 1395 141 ppm
Mn 4A_MICP 336 34 ppm
Mo 4A_MICP 2 0.2 ppm
Nb 4A_MICP 4 0.6 ppm
Ni 4A_MICP 165 18 ppm
P 4A_MICP 123 17 ppm
Pb 4A_MICP 532 89 ppm
Rb 4A_MICP 8 1 ppm
Sn 4A_MICP 2 0.5 ppm
Sr 4A_MICP 29 5 ppm
Th 4A_MICP 80 23 ppm
Ti 4A_MICP 732 130 ppm
Tl 4A_MICP 0.2 0.03 ppm
V 4A_MICP 22 2 ppm
Y 4A_MICP 24 5 ppm
Zn 4A_MICP 54 7 ppm
Zr 4A_MICP 156 39 ppm
Major Oxides
U3O3 XRF 0.12 0.01 %
U3O8 XRF 0.13 0.01 %
Al2O3 XRF 2.72 0.10 %
CaO XRF 0.17 0.01 %
Cr2O3 XRF 0.093 0.009 %
Fe2O3 XRF 5.29 0.10 %
K2O XRF 0.24 0.009 %
MgO XRF 0.25 0.039 %
MnO XRF 0.042 0.01 %
SiO2 XRF 87.81 1.7 %
TiO2 XRF 0.18 0.01 %
