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Krantzberg Mine, Omaruru, Damaraland District, Kunene Region, Namibia

A large tungsten deposit on the Krantzberg Mt (1714 m above sea-level), now abandoned. Located 19 km SW of Omaruru on Farm Pristelwitz. Presently, access is prohibited.

A greisen-hosted W ore deposit with minor F, Sn, Be, Bi, Mo, and Fe-Cu sulfides. The ores were localized through an episode of alteration-mineralization related to the emplacement and fractionation of the Erongo A-type granite; this H2O-poor, but B- and F-rich granite was intruded after the collapse of the Erongo caldera. Granite fractionation resulted in H+- and B-enriched fluids which metasomatized and mineralized the roof country rocks. Early-stage greisenization and the later sericitization were accompanied by the concentration of dominant wolframite, fluorite, beryl, and sulfides. This alteration-mineralization occurred along major lithological and structural breaks. Wolframite (ferberite) formed during a stage of high F activity in the hydrothermal system.

Refs.:
- Pirajno, F. & Schlogl, H. U. (1987): The alteration-mineralization of the Krantzberg tungsten deposit, South West Africa/Namibia. South Afr. J. Geol. 90, 499-508.
- Werner, A.B.T., Sinclair, W.D., and Amey, E.B. (1998): International Strategic Mineral Issues Summary Report - Tungsten. US Geological Survey Circular 930-O.
- Jahn, S. & Bast, R. (2006): Der Krantzberg bei Omaruru, Namibia, und die Mineralvorkommen in seiner Umgebung. Mineralien-Welt 17 (3), 32-48.





Map Reference: 21°24'S , 16°1'E

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Mineral List:
'Albite-Anorthite Series'
Apatite-(CaF)
Arsenopyrite
Axinite-(Fe)
Azurite
Beryl
var: Aquamarine
var: Goshenite
var: Heliodor
Bismite
Bismuth
Bismuthinite
Calcite
Cassiterite
Chalcopyrite
'Chlorite Group'
'Columbite-Tantalite'
Danburite
Datolite
Fluorite
Goethite
Goyazite
Hematite
Kahlerite
'K Feldspar'
Magnetite
Malachite
Metakahlerite
Molybdenite
'Monazite'
Muscovite
Opal
Orthoclase
Powellite
Pyrite
Pyrrhotite
Quartz
var: Smoky Quartz
Russellite
Rutile
Scheelite
Scorodite
Siderite
Topaz
'Tourmaline'
Tungstite
Wolframite
Zircon


48 entries listed. 37 valid minerals.

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