Description
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AMIS0574 Au 3.47g/t Greenstone South Africa
Origin of Material
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. The material comes from the Greenstone belt in Barberton.
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 sulphides and gold mineralisation.
Recommended Concentrations and Limits
(at two Standard Deviations)
Certified Concentrations
Analyte Method Certified (µ)7 (2s)9 ± Unit
Au Pb Collection1 3.47 0.29 g/t
Ag 4A_MICP2 0.9 0.2 ppm
Cu 4A_MICP 153 25 ppm
S Combustion/LECO3 0.31 0.03 %
S 4A_MICP 0.37 0.03 %
LOI LOI4 33.39 2.3 %
Al 4A_MICP 3149 411 ppm
Al FUS5 3300 363 ppm
As 4A_MICP 45 9 ppm
Ba 4A_MICP 29 3 ppm
Bi 4A_MICP 0.1 0.02 ppm
Ce 4A_MICP 4 0.7 ppm
Co 4A_MICP 13 3 ppm
Cr 4A_MICP 107 30 ppm
Fe 4A_MICP 5446 801 ppm
Fe FUS 5313 465 ppm
K 4A_MICP 1119 222 ppm
La 4A_MICP 2 0.3 ppm
Li 4A_MICP 5 0.6 ppm
Mg 4A_MICP 9024 1226 ppm
Mg FUS 9209 409 ppm
Mn 4A_MICP 5314 416 ppm
Mo 4A_MICP 2 0.3 ppm
Na 4A_MICP 557 89 ppm
Nb 4A_MICP 0.6 0.2 ppm
Ni 4A_MICP 80 9 ppm
P 4A_MICP 92 15 ppm
Pb 4A_MICP 7 0.7 ppm
Rb 4A_MICP 4 0.6 ppm
Sb 4A_MICP 5 0.9 ppm
Sc 4A_MICP 0.9 0.4 ppm
Sn 4A_MICP 2 0.4 ppm
Th 4A_MICP 0.6 0.2 ppm
Ti 4A_MICP 202 8 ppm
U 4A_MICP 0.7 0.09 ppm
V 4A_MICP 8 3 ppm
W 4A_MICP 0.5 0.1 ppm
Y 4A_MICP 2 0.1 ppm
Zn 4A_MICP 31 2 ppm
Zr 4A_MICP 7 0.6 ppm
