Geological-geochemical characteristics and underground leaching appreciation of uranium deposits in Orefield 401

In this paper, the geological-geochemical characteristics and underground leachability of the uranium deposits in the uranium-barren granite of Orefield 401 are studied. The orefield's granite has experienced reformation of post-diagenetic aqueous fluids for three periods. In early period, the uranium of granite was remobilized by the alkali-metasomatism of hydrothermal with high-temperature, and the activated uranium is the material base forming uranium deposits. In medium period, the mid-epithermal solution was a mixture of the precipitated water and abyssal fluid containing CO2 that rose along abyssal fault, and it leached the active uranium from the granite, then migrated to favorable location of fault structure, and concentrated hydrothermal vein uranium deposits. In late period, the surface water permeated down along ore-forming faults, then the uranium deposits has illuviated, and the physicochemical nature of ore was changed, all that provided the favorable conditions for underground leaching.