Abstract: The eastern mining area of Longmenshan Copper Mine adopts the method of subsection goaf and subsequent filling. Now some stopes have been mined，forming a large goaf. In order to economi⁃ cally and efficiently mine the ore bodies around the eastern goaf of Longmenshan Copper Mine and avoid large-scale collapse accidents，the three-dimensional model of the ore body was established by taking the unmined E3 north and E4 stopes in the eastern mining area as the research object. The numerical simula⁃ tion of five filling mining schemes was carried out，and the advantages and disadvantages of each scheme were ranked from the perspective of safety. The results show that the scheme of cemented filling all the ex⁃ isting goafs is the most safe，but the cost is also the highest. Without dealing with the existing goaf，the safety factor of the scheme of retaining pillars in the stope and partially filling after mining is higher，and the mining cost is slightly lower.

Key words: goaf, mining scheme, numerical simulation