Abstract:

In order to reduce the loss of safety pillar，using pit excavation method to recovery the orebody from surface 10 m to -2.0 m within the immediate mining area of the Sanshandao gold mine.Because subject to site layout of the plant and taking account of speeding up the construction schedule and reducing the production cost，we choose the blast pattern of long-hole shock controlled blasting.To maximize the reduction of blasting vibration on the surrounding environment，proposed the program of pre-splitting blasting on pit outline first，main blast of longhole shock controlled blasting in deep hole later.In this paper，parameters of two controlled blasting method is determined in detail，blasting effect is analyzed.Elaborate on blasting program choosing，blasting parameter optimization，initiation network design and security checking and protection，provides a reference for similar projects.

Key words: Pit excavation, Pre-splitting blasting, Long-hole shock controlled blasting, Millisecond blasting, Blasting network