Abstract: Liguanji Iron Mine belongs to the thick multi-layer steep iron ore deposit, and its bottom lies in the fracture zone.The sublevel open-stoping mining method was primarily adopted.But a serious collapse of footwall wall-rocks happened, and stone rocks were difficult to remove, leading to great deal of loss and dilution and serious security risks as well.After improvement, the upward drift mining method was used in the lower plate of ore deposit, and the upward cut-and-fill mining method was adopted in the upper plate.The span of the top plate was adjusted according to the stability of the ore rocks.The joint exploitation of multi-layer ores lowered the loss and dilution ratio and the cutting engineering quantities, by which the safe and efficient mining with good economic returns were obtained.

Key words: Upward drift filling method, Upward cut-and-fill mining method, The fracture zone, Security risks