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Oklo is a region near the town of Franceville, in the Haut-Ogooué province of the Central African state of Gabon. The discovery in September 1972 of several natural nuclear fission reactors in the uranium mines situated there has fired the imagination and aroused the curiosity of scientists.

Gabon was a French colony when prospectors from the French nuclear energy commissariat (the industrial parts, which later became the COGEMA) discovered uranium in the remote region in 1956. France immediately opened mines operated by Comuf (Compagnie des Mines d'Uranium de Franceville) near Mounana village in order to exploit the vast mineral resources and the State of Gabon was given a minority share in the company.

For forty years, France mined for uranium in Gabon. Once extracted, the uranium was used for electricity production in France and much of Europe. Gabon's miners half-joked that it was thanks to them that France's high-speed TGV trains could operate. Today, however, the uranium deposi