Abstract: There is a dump above the south expansion stope of an open-pit mine，which affects the normal expansion and production. In view of this complex engineering condition，the slope cutting parame⁃ ters of the overlying dump are designed first，and then the economical and reasonable stripping ratio is de⁃ termined by the profit method，and the extension part of the open pit is designed based on this index. The results show that the mining loss rate and dilution rate at the end of mining are similar to those in the previ⁃ ous period of the mine，and the stripping ratio is 11.98，which is less than the economical and reasonable stripping ratio，and the recovery of ore resources is economical and reasonable. The research ideas provide reference for mine design with similar engineering conditions.

Key words: dump slope, stope slope, economical and reasonable stripping ratio, profitability method