Superimposed metallogenesis in the formation of rich ores in uranium deposit No. 460

Uranium deposit No.460 possesses not only considerable size, but also rich ores with a certain reserves. In this deposit the grade of uranium varies widely. Therer are two rich ore accumulation areas with high grade of uranium in the middle-depth and shallow parts of the deposit. The main geological factors for the formation and localization of rich ores in uranium deposit No.460 are the regional geological setting with high uranium content which resulted from two preconcentrations: the intersection of multiple sets of faulted structures with volcanic structures as well as mineralizing channel and the ore preservation conditions provided by the pre-ore hydromicazation; the mutual superposition of mineralization by hydrothermal alteration occurring during the late Yanshanian and Himalayan movements and only sufering from slight denudation and having fine conditons of ore preservation after mineralization