Description
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AMIS0641 Au 0.368g/t Cu 72ppm Quartz-Carbonate Namibia
Origin of Material
The material for this standard was sourced from the Otjikoto Gold Mine owned by B2Gold Namibia12. 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)7 (2s)9 ± Unit
Au Pb Collection1 0.368 0.034 g/t
Pd Pb Collection 0.026 0.0028 g/t
C Combustion/LECO2 2.43 0.12 %
S Combustion/LECO 2.59 0.15 %
SG SG3 2.81 0.13 Dimensionless
Al 4A_MICP4 5.97 0.67 %
Al FUS5 6.13 0.35 %
Ba 4A_MICP 18 5 ppm
Be 4A_MICP 0.6 0.09 ppm
Bi 4A_MICP 0.4 0.2 ppm
Ca 4A_MICP 4.45 0.37 %
Co 4A_MICP 19 6 ppm
Cr 4A_MICP 157 42 ppm
Cr FUS 200 4 ppm
Cs 4A_MICP 1 0.07 ppm
Cu 4A_MICP 72 15 ppm
Fe 4A_MICP 7.56 0.25 %
Fe FUS 7.67 0.28 %
Ga 4A_MICP 18 5 ppm
Hf 4A_MICP 4 1 ppm
K 4A_MICP 1151 99 ppm
La 4A_MICP 29 5 ppm
Li 4A_MICP 7 1 ppm
Mg 4A_MICP 1.74 0.13 %
Mg FUS 1.81 0.076 %
Mn 4A_MICP 1272 82 ppm
Mn FUS 1367 95 ppm
Mo 4A_MICP 1 0.1 ppm
Na 4A_MICP 4.61 0.19 %
Ni 4A_MICP 50 6 ppm
P 4A_MICP 738 71 ppm
Pb 4A_MICP 29 7 ppm
Sb 4A_MICP 4 1 ppm
Sc 4A_MICP 12 2 ppm
Si FUS 25.00 1.2 %
Sr 4A_MICP 86 9 ppm
Ti 4A_MICP 3964 490 ppm
Ti FUS 3959 407 ppm
V 4A_MICP 185 17 ppm
Y 4A_MICP 19 5 ppm
Zn 4A_MICP 38 4 ppm
Zr 4A_MICP 120 13 ppm
