Description
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Origin of Material
Samples are from the Black Reef found at the base of the Transvaal Supergroup. Both reef types are from the East Rand Basin in the Springs Gauteng vicinity.
Approximate Mineral and Chemical Composition
The Black Reef Batches are mostly silicates (siliceous quartzites and vein quartz pebbles) with a high pyrite content and minor micas. Pyrite (FeS2) content can be as high as 30%.
Summary Statistics
Recommended Concentrations and Limits (at two Standard Deviations)
Au Pb Collection 13.60 2.3 g/t
U 4A_MICP 138 5 ppm
U XRF 151 31 ppm
C Combustion/LECO 1324 224 ppm
LOI LOI 16.14 0.21 %
SG SG 3.18 0.14 Dimensionless
Ag 4A_MICP 4 0.3 ppm
Al 4A_MICP 1.91 0.10 %
Al XRF 1.91 0.13 %
As 4A_MICP 517 18 ppm
Ba 4A_MICP 123 6 ppm
Be 4A_MICP 0.9 0.1 ppm
Ca XRF 714 97 ppm
Co 4A_MICP 181 14 ppm
Cr XRF 1392 164 ppm
Cu 4A_MICP 76 11 ppm
K 4A_MICP 5396 228 ppm
K XRF 5462 373 ppm
Mg 4A_MICP 3307 138 ppm
Mg XRF 3580 218 ppm
Mn 4A_MICP 467 31 ppm
Mo 4A_MICP 3 1 ppm
Na 4A_MICP 727 75 ppm
Ni 4A_MICP 481 27 ppm
P 4A_MICP 81 21 ppm
Pb 4A_MICP 184 42 ppm
Sb 4A_MICP 22 8 ppm
Sr 4A_MICP 36 5 ppm
Ti XRF 878 139 ppm
V 4A_MICP 25 5 ppm
Zn 4A_MICP 289 51 ppm
Major Oxides Certified Concentrations (at two Standard Deviations)
U3O8 4A_MICP 0.016 0.0006 %
U3O8 XRF 0.018 0.004 %
Al2O3 XRF 3.61 0.24 %
CaO XRF 0.10 0.01 %
Cr2O3 XRF 0.20 0.02 %
Fe2O3 XRF 24.61 1.5 %
K2O XRF 0.66 0.04 %
MgO XRF 0.60 0.04 %
SiO2 XRF 52.52 1.0 %
TiO2 XRF 0.15 0.02 %
