The research situation of depressurized mining and existence problem for medium-thick ore-body

The mining characteristic of medium-thick ore-body is that the mobility of broken ore is limited, it is very important to keep those development workings in stable condition to guarantee safe production. If the weak surrounding rock mass is highly stressed, the ore may be lost permanently since the damaged development tunnels become not accessible due to safety. In addition, with mining depth increased, more and more underground mines face the problem of serious stope failure because of ground pressure redistribution. So, the paper propose depressurized mining method for medium-thick ore-body. The paper introduce the different depressurized mining method and analyze its shortcomings. According to the medium-thick ore-body's mining characteristic, the paper analyze the major technique problem that influence mining successfully or not in the depressurized mining and the major problem that need to be solved in the depressurized sublevel caving method for medim-thick ore-body.