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 59.50 2.6 g/t
Au FA_GRAV 58.45 1.6 g/t
Au CL 29.28 7.5 g/t
C Combustion/LECO 1.14 0.073 %
S Combustion/LECO 14.03 0.78 %
SG SG 3.08 0.33 Dimensionless
Ag 2A_MICP 5 2 ppm
Ag 4A_MICP 5 1 ppm
Cu 4A_MICP 1207 100 ppm
Al 4A_MICP 3.23 0.38 %
Be 4A_MICP 0.6 0.2 ppm
Bi 4A_MICP 3 0.2 ppm
Ca 4A_MICP 1.19 0.17 %
Co 2A_MICP 539 8 ppm
Co 4A_MICP 538 63 ppm
Cr 4A_MICP 1045 176 ppm
Cs 4A_MICP 4 0.3 ppm
Fe 2A_MICP 19.22 0.37 %
Fe 4A_MICP 19.53 1.2 %
Hf 4A_MICP 1 0.3 ppm
In 4A_MICP 0.07 0.03 ppm
K 4A_MICP 1.24 0.10 %
La 4A_MICP 14 2 ppm
Li 4A_MICP 21 3 ppm
Lu 4A_MICP 0.1 0.08 ppm
Mg 4A_MICP 3.04 0.19 %
Mn 4A_MICP 750 81 ppm
Mo 4A_MICP 8 1 ppm
Na 4A_MICP 2244 274 ppm
Ni 4A_MICP 3253 544 ppm
P 4A_MICP 214 24 ppm
Pb 2A_MICP 1696 109 ppm
Pb 4A_MICP 1638 161 ppm
Rb 4A_MICP 46 5 ppm
Re 4A_MICP 0.01 0.005 ppm
Sb 4A_MICP 255 42 ppm
Sc 4A_MICP 12 2 ppm
Se 4A_MICP 4 0.7 ppm
Sn 4A_MICP 6 1 ppm
Sr 4A_MICP 43 3 ppm
Ta 4A_MICP 0.3 0.1 ppm
Te 4A_MICP 1 0.2 ppm
Th 4A_MICP 7 2 ppm
Tl 4A_MICP 0.5 0.06 ppm
U 4A_MICP 4 0.4 ppm
V 4A_MICP 84 22 ppm
W 4A_MICP 11 2 ppm
Y 4A_MICP 8 1 ppm
Zn 2A_MICP 309 51 ppm
Zn 4A_MICP 300 25 ppm
Major Oxides
Certified Concentrations (at two Standard Deviations)
Analyte Method Certified Value (µ) Two standard deviations (2s) ± Unit
MnO XRF 0.10 0.02 %