Description
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AMIS0643 Au 0.079 g/t Cu 129ppm Quartz-Carbonate Namibia
Origin of Material
The material for this standard was sourced from the Otjikoto Gold Mine owned by B2Gold Namibia13. The Otjikoto Gold deposit is located within the Damara Mobile Belt, which forms part of the Pan-African Mobile Belt system. The Otjikoto Gold mine is located about 300 km north of Windhoek, in Otjozondjupa province, in Namibia.
Approximate Mineral and Chemical Composition
The Otjikoto project is located within the Neoproterozoic Damara mobile belt, which forms part of the Pan–African mobile belt system. The deposit falls under the general classification of an orogenic gold deposit and occurs in a similar stratigraphic position as the Navachab gold mine deposit. The Otjikoto deposit lithology has been divided into three principal mineralized lithostratigraphic units, from top to base, the OTC, OTB, and OTA . The OTC albitite-hornfels unit hosts most of the mineralised vein system and is underlain by a distinct marker horizon, the unmineralised OTB calcitic marble.
Gold in the main Otjikoto deposit is hosted by a north-north-east-striking sheeted sulphide (+ magnetite) –quartz and carbonate vein system. Gold occurs within the vein system as coarse native gold with a size variation from 5microns to 4000 microns. It occurs adjacent to and within sulphides, garnets on the edges of amphiboles and chlorite, as free gold in quartz and carbonates
Recommended Concentrations and Limits
(at two Standard Deviations)
Certified Concentrations
Analyte Method Certified (µ)8 (2s)10 ± Unit
Au Pb Collection1 0.079 0.018 g/t
Pd Pb Collection 0.014 0.0028 g/t
C Combustion/LECO2 2 0.1 ppm
S Combustion/LECO 0.15 0.03 %
S 4A_MICP3 0.16 0.01 %
LOI LOI4 7.93 0.48 %
SG SG5 2.76 0.10 Dimensionless
Al 4A_MICP 6.38 0.52 %
Al FUS6 6.20 0.21 %
Be 4A_MICP 1 0.2 ppm
Ca 4A_MICP 5.88 0.17 %
Ca FUS 5.99 0.69 %
Cd 4A_MICP 1 0.4 ppm
Co 4A_MICP 17 4 ppm
Cr 4A_MICP 116 18 ppm
Cr FUS 144 17 ppm
Cs 4A_MICP 1 0.1 ppm
Cu 4A_MICP 129 22 ppm
Fe 4A_MICP 5.77 0.19 %
Fe FUS 5.62 0.20 %
Ga 4A_MICP 17 5 ppm
Hf 4A_MICP 4 1 ppm
K 4A_MICP 4177 403 ppm
La 4A_MICP 31 2 ppm
Mg FUS 5955 180 ppm
Mn 4A_MICP 818 20 ppm
Mn FUS 826 26 ppm
Mo 4A_MICP 2 0.7 ppm
Na 4A_MICP 3.48 0.18 %
Ni 4A_MICP 44 7 ppm
Pb 4A_MICP 48 8 ppm
Rb 4A_MICP 24 5 ppm
Sb 4A_MICP 3 0.4 ppm
Sc 4A_MICP 12 1 ppm
Si FUS 26.30 1.07 %
Sr 4A_MICP 156 6 ppm
Ta 4A_MICP 0.6 0.08 ppm
Te 4A_MICP 0.7 0.3 ppm
Ti FUS 4235 199 ppm
U 4A_MICP 3 0.1 ppm
V 4A_MICP 158 12 ppm
W 4A_MICP 9 3 ppm
Y 4A_MICP 17 0.7 ppm
Zn 4A_MICP 120 5 ppm
Zr 4A_MICP 137 14 ppm
