During the medium long-hole blasting process in deep steeply inclined thin ore bodies,the surrounding rock’s compression force often causes issues such as inadequate blasting or excessive blasting during production practice.This leads to significant mining losses and ore dilution.Based on the mining technical conditions of a specific mine and using PFC 2D numerical simulation software to numerically simulate the medium long-hole blasting process in deep steeply inclined thin ore bodies,a quantitative analysis was performed on the impact of surrounding rock compression force on blasting effects in deep steeply inclined thin ore bodies.It was determined that the borehole diameter should be 65 mm and the blast spacing (resistance line) should be 1.6 m.Field applications showed that the blasting results were satisfactory with a low block rate,an ore dilution rate of 15 %,a mining loss rate of 5 %,and an explosive consumption of 0.6 kg/t.The numerical simulation results were consistent with field blasting effects,and the corresponding blasting parameters can guide on-site production.