[en] U and Pb isotopic data on samples (10 to 100 gram) 2 to 10 m away from the borders of the Oklo reactor zones indicate a primary age of 2.05 x 10⁹ years for the Oklo deposit and a secondary age of 0.375 x 10⁹ years. All samples show effects of Pb loss; the average loss is 50 percent. Both the U--Pb and Pb isotopic data are consistent with a model of a primary 2.05 x 10⁹ year age of the deposit, continuous volume diffusion of Pb from uraninite, and either continuous or recent loss of this Pb. In this case the 0.375 x 10⁹ year age is an artifact without time significance. Using an average value of D/a² 3.5 x 10^-11 a^-1 (Cowan, this conference) this model explains the apparent 1.8 x 10⁹ year Pb age observed by other workers. From the ²⁰⁸Pb/²⁰⁶Pb data the average U/Th value calculated for the Oklo deposit is approximately 100