Abstract: In view of the optimization scheme of the transition mining boundary from slope mining to deep and deep concave open-pit mining in Dumu Mining Area,the evaluation and calculation of the optimization step length of the cross section are carried out through the establishment of stope terrain database,drilling database and optimized initial model,derivative of the step length of each section is calculated,and the overall optimization step is given,so as conduct the overall optimization for iterative calculations and determine the overall optimal scheme.Based on the above study results and MATLAB software,the mining boundary optimization software of Dumu Mining Area is compiled.Through optimization calculation,the new optimization mining boundary is obtained,about 0.188 3×108 t mineral resources with high grade is increased,and the net profit is raised by 5.156 4 ×10⁸ yuan,besides that,the mine serive time is increased by 7.5 a.

Key words: Optimization of mining boundary, Deep concave open-pit mining, Iorn mine, MATLAB, Mine service time