Abstract:Qianjiadian uranium deposit in Inner Mongolia is characterized by multi-layer, low grade, poor permeability, high carbonate content, large scale, and dispersion with many ore bodies, which makes it difficult to design mining area and determine economic efficiency. Based on study of resource status and mining experience in recent years, it is considered that characteristics of CO2+O2 in-situ leaching process should be firstly studied, economic and technical indexes of leaching process should be summarized, therefore, the minimum recoverable grade and the minimum economic recoverable uranium per square meter should be proposed. The results show that after adopting the above measures, leaching effect of dispersed low-grade ore body is good, and consumption of reagent per ton does not increase with the decrease of ore grade.