Abstract: Jinqu gold mining has a capacity of spaces and demands expansion.For this,the optimization method is selected for mining,the numerical simulation method for optimizing the structural parameters of stope,and the orthogonal test for optimizing parameters of rock blasting.At the same time,the sub-level mining process is utilized,where the reserve point column is used to support the roof,long cables and bolting supporting in some place,and the smooth blasting to reduce the destruction of pre-board and to monitor the dynamic sinking of the roof by standard measurement.Research on mining method makes the application of the sub-level filling mining method successful.A result with direct cost 19.07 yuan/t at loss rate of 5.68%,dilution rate of 12.15% has been obtained,which increases the production capacity in the mining to 500 t /d.

Key words: Filling mining, Optimization, Jinqu gold mine