Secondary exploitation of a ISL uranium mine

The concept of secondary exploitation about ISL uranium deposits is supposed in this paper. The study background is ISL uranium deposits at medium term mining and retirement. Based on 'first exploitation', the technology roadmap and scheme about 'secondary exploitation' are proposed according to the deep analysis and calculation on the problems and their cause. About enhancement of ISL mining,it is brought that: 1) oxygen concentration confine that U(IV) minerals can be oxidized enough to U(VI) minerals; 2) constituents and concentration range that the uranium concentration of lixivium can be increased efficiently; 3) newly leaching method that the 'weak dissolution area' and 'dead area' can be decreased efficiently or disappeared. In future, 'secondary exploitation' technology system established by means of research and development could made it possible that: 1) production of sandstone deposits with lower penetrability; 2) the economic benefit and utilization rate of deposits can be improved with first exploitation; 3) the recover or comeback of groundwater after uranium deposits are retired. (authors)