Abstract: The mining method of Lijiagou mining area is evolved from open stoping to caving.The blasting parameters such as ore caving interval,least resistance line,bottom hole pitch,side hole angle are checked and changed in the evolution process of the mining methods;the two ore removal ways of transfer and craper are LHD are conducted comparison and analysis,through field test,the LHD method is selected as the ore removal way in the mining area;besides that,stress distribution of the adjacent roadways are calculated,and the advance interval is also determined.The practice results show that the adjustment of blasting parameters and the selection of ore removal way have a crucial role to reduce the dilution rate and loss rate during the mining process.The above study results related to study of the blasting parameters and ore removal way of Lijiagou mining area during the evolution process of the open stoping method to caving method can provide some reference for reducing the dilution rate and loss rate in the similar mines.

Key words: Open stoping method, Caving method, Dilution and loss rate, Blasting parameters