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Okorusu Mine (Okarusu Mine), Otjiwarongo District, Otjozondjupa Region, Namibia
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Latitude: 20°2'S
Longitude: 16°46'E
 
 
An open pit fluorite mine located 48 (40?) km north of Otjiwarango. Part of an alkaline igneous-carbonatite ring dike complex where fluorite has replaced pegmatitic carbonatite.

Mined since around 1920. Since 1988 operated by Okorusu Fluorspar (Pty) Ltd. Sold in 1997 to Solvay SA.

The mine is famous for outstanding blue and green fluorite crystals, often with phantoms. The mine management allows a specimen miner (Peter Eysselein) to extract fluorite specimens to be sold on the international market (Brandstetter, 2011).


The Early-Cretaceous alkaline rocks/sövite complex intruded Late Precambrian Damara series (quartzites, marbles and biotite schists). The metasedimentary rocks have been fenitized in the vicinity of the intrusion. Fluorite also replaces host-rocks (marbles and biotite schists).

REE-bearing minerals occur in beforsitic carbonatite dikes and carbonate-fluorite-bearing metasomatites. Their HREE content is significant.

Mineral List

Aegirine
Aegirine-augite
Andradite
var: Melanite

'Apatite'
Baryte
'Biotite'
Calcite
Cancrinite
Chalcopyrite
Diopside
'Feldspar Group'
Fluorapatite
Fluorite
var: Yttrofluorite
Galena
Goethite
Hematite
var: Martite

'K Feldspar'
Magnetite
var: Titaniferous Magnetite
'Manganese Oxides'
'Monazite'
Nepheline
Phlogopite
Pyrite
'Pyrochlore'
'Pyroxene Group'
Pyrrhotite
Quartz
var: Citrine
Sphalerite
Strontianite
'Synchysite'
Thorite
Titanite
Xenotime-(Y)


36 entries listed. 22 valid minerals.

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References

Daul, J., Bauer, K. & Moser, P. (1993): Bergbau in Namiba - Erfahrungen einer Studienreise. Institut für Bergbaukunde, Bergtechnik und Bergwirtschaft, Wissenschaftliche Schriftenreihe No. 3, Leoben, Austria, 130 pp (in German).

Kogut, A. I., Hagni, R. D. & Schneider, G. I. C. (1998): Geology, mineralogy, and paragenetic sequence of the Okorusu carbonatite-related fluorite ores, Namibia. In: Ed. Hagni, R. D., Proc. 9th Quadrenn. IAGOD Symp., 1994, 555-573.

Rustemeyer, P. (2000): Okosuru: Fundstelle attraktiver Fluorite in Namibia. Lapis 25(3), 24-29, 50 (in German).

Orris, G.J., and Grauch, R.I. (2002): Rare earth element mines, deposits, and occurrences. USGS Open-File Report 02-189.

Cairncross, B. (2004) Field Guide To Rocks & Minerals Of Southern Africa: 47.

Hagni, R.D., , and Viladkar, S.G., (2006) Similarities And Disimilarities Between The Fluorspar Deposits At The Amba Dongar, India And Okorusu, Namibia Carbonatite Complexes. in Geological Association of Canada, Program with Abstracts Volume 31

Brandstetter, R. (2011): Aus der Okorusu Mine in Namibia: Neue Fluoritfunde mit spektakulären Phantombildungen. Lapis 36 (9), 13-23; 62.

Van der Meersche, E. & Brandstetter, R. (2011): Sensationell flächenreiche Fluorite aus dem B-Pit der Okorusu Mine, Namibia. Lapis 36 (9), 24-26; 62.

Mineral. Record: 20(5), 396.


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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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