Abstract: Taking Balubadong Open-pit Mine as the study example,combined with site reconnaissance and production technical data,three-dimensional models of surface,goaf and ore-body are established based on 3DMine software.According to the goaf theoretical deduce and borehole detection results,the actual occurrence situation of the goaf is obtained,besides that,division of potential dangerous area,analysis and evaluation of slope stability characteristics and isolation thickness is done,besides that,the safety guarantee measures of open-pit mining operation are proposed,so as to ensure the safety production of the mine.

Key words: Open-pit mining,Goaf, ubsidence pit, Slope, Three-dimensional modeling