Abstract: Based on the actual situation of middle deep hole blasting in Tonglushan mine, the method of field test is adopted to optimize the parameters of blasting hole network. Change the layout of the hole from rectangle to triangle, the cut hole above average depth is 0.5 m, and the interval charge method and smooth blasting method are adopted by the side holes, the detonating sequence is optimized, the hole network parameters is adjusted to 1.6 m×1.0 m instead of 1.2 m×1.2 m. The results show that, the blasting large rate and the unit consumption of explosive material are both reduced effectively by using the optimized blasting network parameter, besides that, the roof and edge of stope after blasting are more smother than the ones of stope by using original blasting parameters, the safe guarantee for ore drawing operation is provided, and the good economic and social benefits are achieved.

Key words: Tonglushan mine, Mediumlength hole blasting, Hole network parameter, Blasting hole pattern, Smooth blasting, Blasting sequence