Abstract: In view of the insufficient reserves of mineral resources in the existing mining boundary of J Gold Mine in Xinjiang，it is difficult to meet the needs of the current market economy. In order to realize the efficient and rational utilization of mineral resources and prolong the service life of the mine，the mining boundary optimization research is carried out. Firstly，the key prerequisites such as the occurrence charac‐ teristics of mineral resources in the mining area，the distribution of resource grade in the boundary，the diffi‐ culty of mining，economic benefits and mine safety conditions are systematically analyzed. On this basis， the MICROMINE mining software is used to construct the ore block model and calculate the economic and reasonable stripping ratio. Based on the open-pit optimization program of the software，the multi-scheme op‐ timization of the mining boundary of the deposit is completed based on the principle of LG graph theory，and the optimal open-pit mining boundary is accurately delineated by Surpac software. The research results show that the selection of No.3 optimized boundary as the end boundary foundation pit can effectively im‐ prove the utilization rate of mineral resources，significantly prolong the service life of open-pit mining，and provide technical support for the sustainable production of mines.

Key words: open-pit mine, boundary optimization, economic and reasonable stripping ratio