Abstract: The non-pillar sublevel caving method mainly treats the goaf by caving overlying surrounding rock，and for large “left over” goaf that have not been filled up，the issue of ground pressure safety has not been fundamentally lifted.When the volume of the goaf reaches a certain level，it is prone to cause sudden collapse and instability，resulting in a large impact pressure.It poses a major threat to personnel and production safety in the mine. Taking the “left over” goaf of Xieertala Pb-Zn Mine as the study example，a set of collaborative disposal technology is established to analyze its stability by means of numerical simulation and treat the goaf by means of closed shaft to relieve pressure.At the same time，an advanced microseismic monitoring network is built to conduct all-weather tracking monitoring analysis and early warning to rock movement and goaf stability，and the goal of risk menagement and control for “left over” goal with large scale is realized.The above study results can provide a reliable disposal plan for mines with large-scale “left over”goaf.

Key words: Underground mining, "Left over", goaf, Collaborative disposal technology, Stability analysis, Microseismic monitoring, Caving method