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 sulphides and gold mineralisation.
Summary Statistics
Recommended Concentrations and Limits
(at two Standard Deviations)
Certified Concentrations
Analyte Method Certified Value (µ) Two standard deviations (2s) ± Unit
Au Pb Collection 7.74 0.46 g/t
Au FA_GRAV 7.80 0.52 g/t
Au PA 8.20 0.18 g/t
Au 2A_MICP 6.89 2.6 g/t
Au CL 4.53 0.21 g/t
C Combustion/LECO 1.75 0.11 %
S 4A_MICP 1.52 0.11 %
LOI XRF 8.86 0.54 %
SG SG 2.74 0.37 Dimensionless
Ag 4A_MICP 0.5 0.2 ppm
Cu 2A_MICP 76 8 ppm
Cu 4A_MICP 75 8 ppm
Al 4A_MICP 5.25 0.36 %
As 2A_MICP 3171 126 ppm
As 4A_MICP 3161 172 ppm
Ba 4A_MICP 251 23 ppm
Be 4A_MICP 1 0.09 ppm
Ca 4A_MICP 1.93 0.083 %
Cd 4A_MICP 0.2 0.04 ppm
Co 2A_MICP 40 5 ppm
Co 4A_MICP 40 3 ppm
Cr 4A_MICP 838 141 ppm
Fe 2A_MICP 4.98 0.53 %
Fe 4A_MICP 5.16 0.31 %
K 4A_MICP 2.16 0.078 %
La 4A_MICP 14 2 ppm
Li 4A_MICP 30 6 ppm
Mg 4A_MICP 3.21 0.16 %
Mn 2A_MICP 1012 64 ppm
Mn 4A_MICP 1045 38 ppm
Mo 4A_MICP 1 0.3 ppm
Ni 2A_MICP 323 41 ppm
Ni 4A_MICP 323 28 ppm
Pb 4A_MICP 38 4 ppm
Sb 4A_MICP 80 8 ppm
Sc 4A_MICP 16 0.8 ppm
Sr 4A_MICP 72 8 ppm
Th 4A_MICP 5 0.5 ppm
V 4A_MICP 106 6 ppm
Y 4A_MICP 8 0.7 ppm
Zn 4A_MICP 87 8 ppm
Zr 4A_MICP 74 9 ppm
Major Oxides
Certified Concentrations (at two Standard Deviations)
Analyte Method Certified Value (µ) Two standard deviations (2s) ± Unit
Al2O3 XRF 9.76 0.67 %
CaO XRF 2.68 0.19 %
Cr2O3 XRF 0.15 0.01 %
Fe2O3 XRF 7.46 0.76 %
K2O XRF 2.58 0.17 %
MgO XRF 5.33 0.42 %
MnO XRF 0.14 0.006 %
Na2O XRF 0.43 0.06 %
P2O5 XRF 0.055 0.01 %
SiO2 XRF 58.57 4.7 %
TiO2 XRF 0.43 0.04 %
