Abstract: Due to mutual interferences between the open pit & underground mining operations during the transition period from open pit to underground mining， poor safety production and difficult production continuation occur much more frequently. Aiming at the production conditions of ore-body at the open pit bottom and hanging-wall ore-body of underground mining during transition period， a method was proposed to control the hanging rock caving with the induced caving mining technology through the systematic study on the underground mining and rock caving. In this way， the safety conditions of open pit & underground mining could be improved， and the time and space of open pit & underground mining are also extended. The proposed method was adopted in Xiaowanggou Iron Mine to solve the problem of production discontinuation. The applied results show that a highly efficient and safe mining is realized during the transition from open pit to underground mining.

Key words: transition from open pit to underground mining, induced caving, rock caving control, output continuation, safety production