Description
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AMIS0559 Au 12.01 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.
Analyte Method 8Certified (µ) 10Two Standard Deviation (2s) ± Unit
Au Pb Collection1 12.01 0.819 g/t
C Combustion/LECO2 19 800 483 ppm
S Combustion/LECO 2.88 0.2 %
LOI LOI3 11.00 0.63 %
SG SG4 2.97 0.15 Dimensionless
Ag 4A_MICP5 0.625 0.20 ppm
Al FUS6 78600 7750 ppm
Al 4A_MICP 77120 3450 ppm
As 4A_MICP 4740 528 ppm
Ba FUS 445 29 ppm
Ba 4A_MICP 434 41 ppm
Be 4A_MICP 1 0.13 ppm
Bi 4A_MICP 0.2 0.06 ppm
Ca FUS 11470 1022 ppm
Ca 4A_MICP 11660 896 ppm
Cd 4A_MICP 0.2 0.04 ppm
Ce 4A_MICP 45 7 ppm
Co FUS 44 4 ppm
Co 4A_MICP 43 3 ppm
Cr FUS 1010 149 ppm
Cr 4A_MICP 888 159 ppm
Cs 4A_MICP 5 1 ppm
Cu FUS 61 5 ppm
Cu 4A_MICP 64 11 ppm
Dy 4A_MICP 2 1 ppm
Er 4A_MICP 1 0.4 ppm
Eu 4A_MICP 1 0.07 ppm
Fe 4A_MICP 79070 4640 ppm
Ga 4A_MICP 19 2 ppm
Gd 4A_MICP 3 0.2 ppm
Hf 4A_MICP 3 0.4 ppm
Ho 4A_MICP 0.5 0.1 ppm
In 4A_MICP 0.1 0.01 ppm
K 4A_MICP 33610 1850 ppm
La 4A_MICP 22 4 ppm
Li 4A_MICP 42 7 ppm
Lu 4A_MICP 0.2 0.04 ppm
Mg FUS 36410 2880 ppm
Mn FUS 1500 84 ppm
Mn 4A_MICP 1450 165 ppm
Mo 4A_MICP 1 0.3 ppm
Na 4A_MICP 1240 163 ppm
Nd 4A_MICP 19 2 ppm
Ni FUS 397 57 ppm
Ni 4A_MICP 378 20 ppm
P 4A_MICP 307 46 ppm
Pb 4A_MICP 28 3 ppm
Pr 4A_MICP 5 1 ppm
Rb 4A_MICP 139 11 ppm
S 4A_MICP 3.00 0.30 %
Sb 4A_MICP 17 3 ppm
Sc 4A_MICP 21 3 ppm
Sm 4A_MICP 4 0.2 ppm
Sn 4A_MICP 2 1 ppm
Sr 4A_MICP 56 5 ppm
Tb 4A_MICP 0.4 0.04 ppm
Te 4A_MICP 2 0.4 ppm
Th 4A_MICP 7 2 ppm
Ti FUS 3780 214 ppm
Tl 4A_MICP 1 0.1 ppm
Tm 4A_MICP 0.2 0.05 ppm
U 4A_MICP 8 1 ppm
V 4A_MICP 142 12 ppm
Y 4A_MICP 11 3 ppm
Yb 4A_MICP 1 0.3 ppm
Zn 4A_MICP 125 19 ppm
Zr 4A_MICP 103 18 ppm
