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Oklo Mine, Franceville, Haut-Ogooué Province, Gabon

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This mine near the Mouana Mine is the site of over a dozen precambrian natural nuclear reactors. Secondary enrichment of uranium oxides in cm to meter sized veins moderated by ground water consumed six tons of U235 and elevated temperatures to a few hundred Celsius. Remarkably the non-volatile fission products moved only a few cm in the veins during the last 1.5 billion years!

See also Bangombé, another natural nuclear reactor in the same area.

Mineral List

46 entries listed. 42 valid minerals.

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


- Econ Geol 84 (1989) 2286-2295.
- Radiochimica Acta 66/67 (1994) 455-461.
- Dymkov, Y., Holliger, P., Pagel, M., Gorshkov, A., and Artyukhina, A. (1997): Characterization of a La-Ce-Sr-Ca aluminous hydroxy phosphate in nuclear zone 13 in the Oklo uranium deposit (Gabon). Mineralium Deposita 32, 617-620.
- Janeczek, J. (1999): Mineralogy and geochemistry of natural fission reactors in Gabon. Reviews in Mineralogy and Geochemistry, 38, 321-392.
- Hidaka, H. (2007): Geochemical characteristics of an ancient nuclear reactor "Oklo". Journal of Nuclear and Radiochemical Sciences 8, 99-103.

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