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Oklo Mine, Franceville, Haut-Ogooué Province, Gabon

Latitude: 1°30'S
Longitude: 13°16'E
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

'Albite-Anorthite Series'
Baryte
Bassetite
Bornite
Calcite
Chalcopyrite
Chervetite
'Chlorite Group'
Coffinite
Copper
Covellite
Curienite
Dewindtite
Digenite
Duttonite
Fluorapatite
Fourmarierite
Francevillite
Galena
Goethite
Hematite
Ilmenite
Karelianite
Kasolite
Lead
Metavanuralite
Minium
Molybdenite
Montroseite
Muscovite
var: Illite

Nolanite
Pyrite
Quartz
Roscoelite
Rutherfordine
Sphalerite
Sudoite
Titanite
Torbernite
Uraninite
var: Pitchblende
Uranophane
Vanuralite
Wölsendorfite
Wulfenite
Zircon


46 entries listed. 42 valid minerals.

The above list contains all mineral locality references listed on mindat.org. 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 mindat.org 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.

References

- 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.
Janusz Janeczek (1999) Mineralogy and geochemistry of natural fission reactors in Gabon. Reviews in Mineralogy and Geochemistry, MSA, v. 38, p. 321-392
- Hidaka, H. (2007): Geochemical characteristics of an ancient nuclear reactor "Oklo". Journal of Nuclear and Radiochemical Sciences 8, 99-103.

- http://www.curtin.edu.au/curtin/centre/waisrc/OKLO/Where/Where.html [Link Broken? Feb 2014]

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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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