Description
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AMIS0573 Au 1.06g/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 mineralization.
Recommended Concentrations and Limits
(at two Standard Deviations)
Certified Concentrations
Analyte Method Certified (µ)6 (uc)7 (2s)8 ± Unit
Au Pb Collection1 1.06 0.053 0.11 g/t
Ag 4A_MICP2 0.7 0.1 0.3 ppm
Cu 4A_MICP 366 23 47 ppm
LOI LOI3 28.43 0.89 1.8 %
S 4A_MICP 0.56 0.04 0.08 %
Al 4A_MICP 5974 161 321 ppm
Al FUS4 5644 305 610 ppm
As 4A_MICP 45 1 3 ppm
Ba 4A_MICP 62 4 8 ppm
Be 4A_MICP 0.3 0.1 0.2 ppm
Bi 4A_MICP 0.1 0.009 0.02 ppm
Ca 4A_MICP 36.18 1.2 2.5 %
Cd 4A_MICP 0.1 0.04 0.09 ppm
Ce 4A_MICP 5 0.4 0.7 ppm
Co 4A_MICP 16 0.8 2 ppm
Cs 4A_MICP 0.5 0.02 0.05 ppm
Dy 4A_MICP 0.4 0.02 0.04 ppm
Eu 4A_MICP 0.1 0.02 0.04 ppm
Fe 4A_MICP 7202 385 770 ppm
Fe FUS 0.7 0.08 0.2 %
Ga 4A_MICP 2 0.1 0.3 ppm
Hf 4A_MICP 0.2 0.03 0.05 ppm
Ho 4A_MICP 0.071 0.004 0.009 ppm
K 4A_MICP 2743 153 306 ppm
La 4A_MICP 3 0.2 0.5 ppm
Li 4A_MICP 9 0.6 1 ppm
Lu 4A_MICP 0.03 0.005 0.01 ppm
Mg 4A_MICP 1.11 0.067 0.13 %
Mg FUS 1 0.1 0.2 ppm
Mn 4A_MICP 5056 187 374 ppm
Mo 4A_MICP 3 0.7 1 ppm
Na 4A_MICP 496 8 16 ppm
Nb 4A_MICP 0.9 0.1 0.3 ppm
Nd 4A_MICP 2 0.2 0.4 ppm
Ni 4A_MICP 102 4 8 ppm
Pb 4A_MICP 5 0.4 0.8 ppm
Pr 4A_MICP 0.6 0.04 0.08 ppm
Rb 4A_MICP 9 0.6 1 ppm
Sb 4A_MICP 7 0.4 0.8 ppm
Sc 4A_MICP 2 0.3 0.6 ppm
Si FUS 5.64 0.33 0.66 %
Sm 4A_MICP 0.5 0.07 0.1 ppm
Sn 4A_MICP 0.8 0.05 0.1 ppm
Sr 4A_MICP 64 4 8 ppm
Tb 4A_MICP 0.1 0.005 0.01 ppm
Th 4A_MICP 0.7 0.08 0.2 ppm
Ti 4A_MICP 290 13 26 ppm
Ti FUS 0.03 0.005 0.01 ppm
Tl 4A_MICP 0.1 0.04 0.08 ppm
U 4A_MICP 0.7 0.07 0.1 ppm
V 4A_MICP 16 2 4 ppm
W 4A_MICP 0.7 0.2 0.3 ppm
Y 4A_MICP 2 0.1 0.2 ppm
Zn 4A_MICP 32 2 4 ppm
Zr 4A_MICP 9 0.8 2 ppm
