Abstract: The vertical height of slope in Jianshan 2# hanging wall ore of Daye Iron Mine reaches over 300 meters, and the whole ore body is traversed by F13 huge fault which is almost orthometric with the slope.Large mined-out area has been formed after exploiting for some times, leading to a great hazard to safety mining.Filling the mined-out area with tailings can not only prevent the slope failure and protect the national geological park landscape, but create conditions for continuous recovery of the hanging wall ore.The recovery of residual ores by the back-fill mining method can maximize the recovery of ores and accumulate experiences for the application of back-fill method in the deep mine after open pit transferring into underground mining.

Key words: Hanging wall ore, High and steep slope, Filling mined-out area, Recovery of residual ores