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Curtin University

The Oklo Fossil Fission Reactors

oklo mine

Above: Oklo minesite 1997 [Photo by Minesite Engineer, Andreas Mittler].

This is one of the most fascinating stories in the relatively short history of Science and especially in the even shorter history of Nuclear Physics. In 1972 the very well preserved remains of several ancient natural nuclear reactors were discovered in the middle of the Oklo Uranium ore deposit.

Since their discovery the Oklo reactors have been studied by many scientists around the world who have uncovered the answers to the following questions.

Here you can explore the answers to these and many other questions about the Oklo natural fossil reactors and investigate many other things about nuclear fission.

For more information you can email the author (Dr Robert Loss) at