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 25.06 1.9 g/t
Au CL 23.22 3.3 g/t
S 4A_MICP 1.28 0.030 %
S Combustion/LECO 1.28 0.064 %
Ag 4A_MICP 2 0.09 ppm
As 4A_MICP 3079 108 ppm
Cu 4A_MICP 160 14 ppm
LOI LOI 8.08 0.46 %
SG SG 2.90 0.59 Dimensionless
Al 4A_MICP 3.74 0.14 %
Ba 4A_MICP 96 7 ppm
Be 4A_MICP 6 1 ppm
Bi 4A_MICP 0.7 0.4 ppm
Ca 4A_MICP 3.10 0.33 %
Ce 4A_MICP 8 0.3 ppm
Co 4A_MICP 58 6 ppm
Cs 4A_MICP 19 2 ppm
Fe 4A_MICP 4.19 0.39 %
Ga 4A_MICP 8 0.6 ppm
K 4A_MICP 1.20 0.076 %
La 4A_MICP 4 0.2 ppm
Li 4A_MICP 290 31 ppm
Mg 4A_MICP 3.48 0.45 %
Mo 4A_MICP 3 0.2 ppm
Na 4A_MICP 3634 189 ppm
Nb 4A_MICP 3 2 ppm
Ni 4A_MICP 425 73 ppm
P 4A_MICP 134 31 ppm
Pb 4A_MICP 17 1 ppm
Rb 4A_MICP 103 4 ppm
Sc 4A_MICP 20 1 ppm
Sn 4A_MICP 5 2 ppm
Sr 4A_MICP 61 5 ppm
Tl 4A_MICP 0.8 0.04 ppm
U 4A_MICP 0.9 0.1 ppm
V 4A_MICP 134 12 ppm
Y 4A_MICP 5 0.1 ppm
Zn 4A_MICP 89 14 ppm
Zr 4A_MICP 22 2 ppm
