Navachab Gold Mine, Karibib District, Erongo Region, Namibia
|Latitude & Longitude (WGS84):||21° 58' 51'' South , 15° 45' 55'' East|
|Latitude & Longitude (decimal):||-21.98083,15.76528|
The deposit, with very fine-graind gold, was discovered as a result of a geochemical exploration program in October 1984, during exploration for carbonate-hosted gold deposits area. It was discovered on the farm Navachab, 6 km south of the main Okahandja-Swakopmund tar road, and ca. 10 km SW of Karibib. Construction work began in 1988.
The 35 metre-thick ore body is hosted in a thick marble unit. The ore body dips at 70' to the west and plunges at 14' to the north and it is mined by open-cast method to a depth of over 200 metres. The ore body is estimated to contain 10.4 million tones of ore with average grade of 2.3 grams of gold per ton and a further 6.5 million tones of marginal ore with an average grade of 0.66 grams per ton. It was originally anticipated that the life of mine would be in the region of 13 years.
85% of the gold is unalloyed, 15% is alloyed with bismuth. The average gold grain size is 5 micron.
28 valid minerals.
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
541 - 1000 Ma
|Neoproterozoic intrusive and metamorphic terranes|
Age: Neoproterozoic (541 - 1000 Ma)
Description: Damara Supergroup
Comments: Mixtures of metamorphic and intrusive or plutonic rocks, tracts known as crystalline, migmatitic terranes, moderately to highly metamorphosed rocks of unknown origin with or without intrusions. This classification is inherently prone to variable interpretation, as other compilers might distinguish some packages by their metamorphic or gneissic protoliths, and the associated age ranges may be more variable.
Lithology: Intrusive and metamorphic terranes
Reference: Geological Survey of Canada. Generalized geological map of the world and linked databases. doi:10.4095/195142. Open File 2915d. 
Cairncross, B. (2004) Field Guide To Rocks & Minerals Of Southern Africa, 119.
Von Bezing, L., Bode, R., and Jahn, S., (2008) Namibia Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag GmbH, Haltern. (in English).
Dziggel, A., Wulff, K., Kolb, J., and Meyer, F.M. (2009) Processes of high-T fluid–rock interaction during gold mineralization in carbonate-bearing metasediments, the Navachab gold deposit, Namibia. Mineralium Deposita 44, 665-687.
Vollgger, S. A., Cruden, A. R., Ailleres, L., & Cowan, E. J. (2015). Regional dome evolution and its control on ore-grade distribution: Insights from 3D implicit modelling of the Navachab gold deposit, Namibia. Ore Geology Reviews, 69, 268-284.