Relationship between uranium mineralization and hydrologic condition in Yili Basin

The sandstone-type uranium deposit is a kind of hydro-sedimentary mineral. It is very important to study the relationship between the hydrogeological conditions and uranium mineralization to reveal the uranium metallogenic regularity and predict the target area of uranium ore.Yili Basin is taken as an example, the hydrodynamic conditions of uranium mineralization in different geological periods are analyzed according to the evolution characteristics of groundwater system. Hydrogeochemical techniques are used to analyze groundwater chemical characteristics and hydrogeochemical conditions of uranium mineralization. The relationship between the distribution of uranium deposits and the development characteristics of uranium reservoirs and interlayer oxidation zones are statistically analyzed according to uranium exploration drilling data. It reveals the spatial differences of uranium ore-forming hydrogeological conditions among uranium deposits of different ages, and the favorable position of uranium mineralization. It indicates that the southwestern basin is the most advantageous part for uranium richness because it has stable geological structure and large-scale uranium reservoir with good continuity, which is beneficial for continual uranium mineralization. The southeast is the second favorable part for uranium richness, and the northern uranium mineralization conditions are the weakest. From the perspective of different uranium reservoirs, the uranium metallogenic conditions of Xishanyao Formation is the best, followed by Badaowan, and the Xiaoquangou group is the weakest.