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.
Recommended Concentrations and Limits
Certified Concentrations (at two Standard Deviations)
Analyte Method Certified Value (µ) Two standard deviations (2s) ± Unit
Au Pb Collection 20.67 2.0 g/t
Au FA_GRAV 20.49 1.3 g/t
Au 2A_MICP 18.69 4.1 g/t
Au CL 16.02 5.8 g/t
C Combustion/LECO 1.32 0.089 %
S Combustion/LECO 2.35 0.32 %
S 4A_MICP 2.33 0.16 %
LOI LOI 7.82 0.78 %
SG SG 2.72 0.26 Dimensionless
Ag 4A_MICP 0.8 0.4 ppm
Cu 2A_MICP 89 15 ppm
Cu 4A_MICP 84 7 ppm
Al 4A_MICP 5.20 0.47 %
As 2A_MICP 4955 152 ppm
As 4A_MICP 4985 197 ppm
Ba 4A_MICP 232 28 ppm
Be 4A_MICP 2 0.3 ppm
Bi 4A_MICP 1 0.2 ppm
Ca 4A_MICP 2.00 0.26 %
Cd 4A_MICP 0.2 0.06 ppm
Ce 4A_MICP 24 3 ppm
Co 2A_MICP 49 4 ppm
Co 4A_MICP 51 7 ppm
Cs 4A_MICP 28 3 ppm
Dy 4A_MICP 2 0.2 ppm
Er 4A_MICP 1 0.1 ppm
Eu 4A_MICP 0.6 0.2 ppm
Fe 2A_MICP 5.18 0.46 %
Fe 4A_MICP 5.65 0.50 %
Ga 4A_MICP 13 5 ppm
Gd 4A_MICP 2 0.4 ppm
Hf 4A_MICP 2 0.2 ppm
Ho 4A_MICP 0.3 0.05 ppm
In 4A_MICP 0.05 0.02 ppm
K 4A_MICP 2.10 0.10 %
La 4A_MICP 12 2 ppm
Li 4A_MICP 64 15 ppm
Lu 4A_MICP 0.2 0.04 ppm
Mg 4A_MICP 4.76 0.57 %
Mn 2A_MICP 877 194 ppm
Mn 4A_MICP 1118 68 ppm
Mo 4A_MICP 1 0.5 ppm
Na 4A_MICP 3339 508 ppm
Nb 4A_MICP 4 0.5 ppm
Nd 4A_MICP 10 2 ppm
Ni 2A_MICP 440 55 ppm
Ni 4A_MICP 459 55 ppm
P 4A_MICP 188 17 ppm
Pb 2A_MICP 55 9 ppm
Pb 4A_MICP 55 9 ppm
Pr 4A_MICP 3 0.4 ppm
Rb 4A_MICP 111 8 ppm
Sb 4A_MICP 48 9 ppm
Sc 4A_MICP 18 4 ppm
Sm 4A_MICP 3 1 ppm
Sn 4A_MICP 2 0.8 ppm
Sr 4A_MICP 60 20 ppm
Ta 4A_MICP 0.6 0.2 ppm
Te 4A_MICP 0.9 0.3 ppm
Tl 4A_MICP 0.8 0.2 ppm
Tm 4A_MICP 0.1 0.03 ppm
V 4A_MICP 122 8 ppm
W 4A_MICP 5 2 ppm
Y 4A_MICP 7 1 ppm
Yb 4A_MICP 1 0.1 ppm
Zn 4A_MICP 94 11 ppm
Zr 4A_MICP 57 15 ppm
Major Oxides
Certified Concentrations (at two Standard Deviations)
Analyte Method Certified Value (µ) Two standard deviations (2s) ± Unit
Al2O3 XRF 9.72 0.67 %
CaO XRF 2.67 0.10 %
Cr2O3 XRF 0.26 0.02 %
Fe2O3 XRF 8.19 0.33 %
K2O XRF 2.47 0.061 %
MgO XRF 7.83 0.34 %
MnO XRF 0.14 0.008 %
Na2O XRF 0.44 0.08 %
P2O5 XRF 0.040 0.003 %
SiO2 XRF 57.32 4.0 %
SO3 XRF 5.68 0.62 %
TiO2 XRF 0.41 0.04 %
