Description
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Au 5.45 g/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.
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 6Certified (µ) 8Two Standard Deviation (2s) ± Unit
Au Pb Collection1 5.45 0.44 g/t
SG SG2 2.87 0.064 Dimensionless
C Combustion/LECO3 17908 1118 ppm
S Combustion/LECO 1.33 0.11 %
Ag 4A_MICP4 1 0.5 ppm
As 4A_MICP 3727 382 ppm
Ba 4A_MICP 254 20 ppm
Be 4A_MICP 1 0.1 ppm
Bi 4A_MICP 1 0.2 ppm
Ca 4A_MICP 17125 815 ppm
Cd 4A_MICP 0.2 0.2 ppm
Co 4A_MICP 43 5 ppm
Cs 4A_MICP 5 0.3 ppm
Cu 4A_MICP 64 6 ppm
Dy 4A_MICP 1 1 ppm
Er 4A_MICP 1 0.3 ppm
Eu 4A_MICP 1 0.1 ppm
Fe 4A_MICP 50485 4344 ppm
Ga 4A_MICP 12 3 ppm
Gd 4A_MICP 2 1 ppm
Hf 4A_MICP 2 1 ppm
Ho 4A_MICP 0.3 0.1 ppm
In 4A_MICP 0.04 0.01 ppm
K 4A_MICP 22081 938 ppm
La 4A_MICP 13 5 ppm
Li 4A_MICP 18 1 ppm
Lu 4A_MICP 0.1 0.07 ppm
Mg 4A_MICP 24245 1512 ppm
Mn 4A_MICP 1021 86 ppm
Mo 4A_MICP 1 0.2 ppm
Na 4A_MICP 2829 362 ppm
Nd 4A_MICP 12 2 ppm
Ni 4A_MICP 326 37 ppm
P 4A_MICP 243 41 ppm
Pb 4A_MICP 20 4 ppm
Pr 4A_MICP 3 1 ppm
Rb 4A_MICP 94 11 ppm
S 4A_MICP 1.39 0.095 %
Sb 4A_MICP 262 66 ppm
Sc 4A_MICP 17 3 ppm
Sm 4A_MICP 2 1 ppm
Sr 4A_MICP 68 9 ppm
Tb 4A_MICP 0.3 0.1 ppm
Th 4A_MICP 4 0.5 ppm
Tl 4A_MICP 1 0.05 ppm
Tm 4A_MICP 0.1 0.04 ppm
U 4A_MICP 1 0.2 ppm
V 4A_MICP 124 13 ppm
W 4A_MICP 2 1 ppm
Y 4A_MICP 7 3 ppm
Yb 4A_MICP 1 0.2 ppm
Zn 4A_MICP 110 13 ppm
Major Oxides
Certified Concentrations (at two Standard Deviations)
Analyte Method 6Certified (µ) 8Two Standard Deviation (2s) ± Unit
Al2O3 XRF5 10.17 0.24 %
CaO XRF 2.44 0.17 %
Cr2O3 XRF 0.416 0.033 %
Fe2O3 XRF 7.22 0.40 %
K2O XRF 2.65 0.12 %
MgO XRF 4.21 0.28 %
MnO XRF 0.138 0.016 %
P2O5 XRF 0.060 0.014 %
SiO2 XRF 62.43 0.92 %
TiO2 XRF 0.463 0.016 %
