Study on multi-diameter blastholes combined mining used in complex orebody

The eastern iron district is remained in the No.1 orebody of Anqing Copper Mine with complex shapes.Double stage continuous stoping is used to the orebody respectively with large,deep and middle blastholes.Meanwhile,the industrial tests are carried out and the stability of mined-out areas and the main technical and economic index are analyzed.It is indicated that the multi-diameter blastholes combined mining method is suitable for the orebody in the eastern iron district above-460 m,and it provides technical assurance for future sustainable high yield and stable yield of mine.