Description
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AMIS0493 Au 4.97g/t Greenstone Geita Tanzania
Origin of Material: AMIS0493 is a commissioned CRM made from material supplied by Geita Gold Mine, which is wholly owned and operated by Anglogold Ashanti. The Geita Gold Mine is situated 80km south-west of the town of Mwanza in the north-west of Tanzania. The Geita gold deposit is an Archaean mesothermal orebody, located in the Sukumaland Greenstones of the Geita Greenstone Belt. It is largely hosted in a banded ironstone formation (BIF). Mineralisation is found where auriferous fluids,
which are interpreted to have moved along shears often on BIF-diorite contacts, reacted with the BIF. Some lower-grade mineralisation can occur in the diorite as well (usually in association with BIF-hosted mineralisation). Approximately 20% of the gold is hosted in the diorite.
Approximate Mineral and Chemical Composition: The major gangue mineral is magnetite with quartz, ankerite, and minor pyrrhotite and chalcopyrite. Gold occurs primarily as discrete grains.
Certified Concentration
Au Pb Collection 4.97 ± 0.2 g/t
Provisional Concentrations
CaO XRF 3.15 ± 0.03 %
Cr2O3 XRF 0.10 ± 0.01 %
Fe2O3 XRF 24.7 ± 0.12 %
K2O XRF 3.46 ± 0.04 %
LOI 3.77 ± 1.04 %
MnO XRF 0.12 ± 0.004 %
Na2O XRF 1.3 ± 0.12 %
P2O5 XRF 0.27 ± 0.03 %
SiO2 XRF 52.17 ± 0.94 %
TiO2 XRF 0.3 ± 0.01 %
S Comb/LECO 2.92 ± 0.16 %
U3O8 0.007 ± 0.0018 %
U 4A_MICP 61.79 ± 6.60 ppm
U XRF 57.68 ± 16.63 ppm
