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 11.87 1.1 g/t
Au FA_GRAV 12.19 0.98 g/t
Au PA 12.26 0.98 g/t
C Combustion/LECO 1.33 0.11 %
S Combustion/LECO 1.35 0.18 %
SG SG 2.85 0.26 Dimensionless
Cu 4A_MICP 83 5 ppm
Al 4A_MICP 4.96 0.48 %
Ba 4A_MICP 197 15 ppm
Be 4A_MICP 1 0.4 ppm
Ca 4A_MICP 2.10 0.048 %
Co 4A_MICP 49 4 ppm
Fe 4A_MICP 5.59 0.24 %
Ga 4A_MICP 11 0.8 ppm
K 4A_MICP 1.84 0.089 %
La 4A_MICP 10 1 ppm
Li 4A_MICP 59 6 ppm
Mg 4A_MICP 4.96 0.32 %
Mn 4A_MICP 1068 38 ppm
Mo 4A_MICP 1 0.2 ppm
Ni 4A_MICP 470 30 ppm
P 4A_MICP 203 22 ppm
Pb 4A_MICP 42 9 ppm
Sb 4A_MICP 76 13 ppm
Sc 4A_MICP 18 1 ppm
Sn 4A_MICP 2 0.3 ppm
Sr 4A_MICP 64 5 ppm
Th 4A_MICP 3 1 ppm
U 4A_MICP 1 0.3 ppm
V 4A_MICP 131 16 ppm
Y 4A_MICP 8 0.6 ppm
Zn 4A_MICP 91 3 ppm
Major Oxides
Certified Concentrations (at two Standard Deviations)
Analyte Method Certified Value (µ) Two standard deviations (2s) ± Unit
Al2O3 XRF 9.57 0.74 %
CaO XRF 2.94 0.16 %
Cr2O3 XRF 0.54 0.03 %
Fe2O3 XRF 8.01 0.27 %
K2O XRF 2.28 0.031 %
MgO XRF 8.27 0.094 %
MnO XRF 0.14 0.01 %
Na2O XRF 0.51 0.06 %
SiO2 XRF 57.75 2.5 %
TiO2 XRF 0.41 0.03 %
Uncertified Concentrations (at two Standard Deviations) on Table 3
Analyte Method (Mean) Two standard deviations (2s) ± Unit
Au 2A_MICP 11.4 0.8 g/t
Au CL 8.0 0.6 g/t
Ag 2A_MICP 1.5 0.4 ppm
Ag 4A_MICP 0.6 0.1 ppm
