Description
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Origin of Material
The material comes from a hydrothermal gold deposit in the Barberton Greenstone Belt. Greenstone belts are zones of variably metamorphosed mafic to ultramafic volcanic sequences with associate sedimentary rocks that occur within Archaean and Proterozoic cratons between granite and gneiss bodies. Greenstone belts are primarily formed of volcanic rocks, dominated by basalt, with minor sedimentary rocks inter-leaving the volcanic formations.
Approximate Mineral and Chemical Composition
The mineral assemblages of the samples are rich in greenschists and associated minerals. Greenschists is a generic name of minerals formed by regional metamorphism of mafic igneous rocks under the relatively low temperatures and pressures. The name greenstone originates from commonly having an abundance of green minerals such as chlorite/chamosite, Actinolite/ and amphiboles and sheets-like minerals such as biotite/muscovite. The common minerals associated with greenschists include quartz, orthoclase, and calcite. The greenschists minerals are generally the pathfinders/ indicative of base metal sulphide and gold mineralization.
Summary Statistics
Recommended Concentrations and Limits (at two Standard Deviations)
Certified Concentrations
Au Pb Collection 69.39 6.0 g/t
Au FA_GRAV 70.09 3.6 g/t
Au CL 58.64 2.3 g/t
S Combustion/LECO 14.69 0.63 %
C Combustion/LECO 1.89 0.16 %
LOI LOI 15.81 0.54 %
SG SG 3.26 0.34 Dimensionless
Al 4A_MICP 2.67 0.26 %
Be 4A_MICP 0.8 0.3 ppm
Bi 4A_MICP 3 1 ppm
Ca 4A_MICP 1.26 0.12 %
Ce 4A_MICP 26 6 ppm
Co 4A_MICP 576 38 ppm
Fe 4A_MICP 20.15 1.3 %
K 4A_MICP 9753 1008 ppm
La 4A_MICP 12 3 ppm
Li 4A_MICP 29 2 ppm
Mn 4A_MICP 769 29 ppm
Mo 4A_MICP 8 0.8 ppm
Na 4A_MICP 2600 200 ppm
Ni 4A_MICP 3207 208 ppm
P 4A_MICP 200 9 ppm
Pb 4A_MICP 1323 89 ppm
Rb 4A_MICP 42 0.5 ppm
Sc 4A_MICP 12 1 ppm
Se 4A_MICP 6 1 ppm
Sn 4A_MICP 25 3 ppm
Sr 4A_MICP 41 5 ppm
Ta 4A_MICP 0.8 0.2 ppm
Te 4A_MICP 1 0.1 ppm
U 4A_MICP 3 0.6 ppm
V 4A_MICP 79 8 ppm
W 4A_MICP 8 2 ppm
Y 4A_MICP 9 4 ppm
Zn 4A_MICP 441 29 ppm
Zr 4A_MICP 54 13 ppm
Uncertified Concentrations (at two Standard Deviation)
Ag 4A_MICP 6.9 4.0 ppm
As 4A_MICP 23762.3 3898.5 ppm
Cu 4A_MICP 1031.2 577.4 ppm
