Abstract: The treatment methods of signal-layers mined-out areas of Sandaozhuang open-pit mining area are introduced in detail, and the safety parameters of deep hole caving method are given. The construction requirements of cavity detection, site preparation, perforation, blasting and shovel loading are regulated. The research results of this paper solve the problems of mined-out areas treatment and residual ore recycling.

Key words: Single-layer mined-out areas, Deep hole caving method, Residual ore recycling