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 3.73 0.37 g/t
Au CL 3.08 0.36 g/t
S 4A_MICP 1.13 0.14 %
Ag 4A_MICP 0.4 0.1 ppm
As 4A_MICP 1809 148 ppm
Cu 4A_MICP 111 6 ppm
C Combustion/LECO 1.30 0.042 %
Al 4A_MICP 5.10 0.18 %
Ba 4A_MICP 187 4 ppm
Be 4A_MICP 2 0.2 ppm
Ca 4A_MICP 2.22 0.19 %
Co 4A_MICP 44 0.6 ppm
Fe 4A_MICP 5.98 0.063 %
K 4A_MICP 1.72 0.20 %
La 4A_MICP 13 5 ppm
Mn 4A_MICP 1142 30 ppm
Mo 4A_MICP 8 0.7 ppm
Nb 4A_MICP 5 1 ppm
Ni 4A_MICP 366 39 ppm
Pb 4A_MICP 22 0.7 ppm
Sb 4A_MICP 42 3 ppm
Sc 4A_MICP 19 2 ppm
Sr 4A_MICP 80 2 ppm
V 4A_MICP 119 4 ppm
Y 4A_MICP 9 1 ppm
Zn 4A_MICP 93 18 ppm
