Abstract: In recent years,with the development of mining technology,medium and deep hole mining has been increasingly adopted in steeply inclined thin veins.In order to reduce production costs,improve economic efficiency and safety factor.By conducting field tests on fanshaped mediumdeep holes and parallel mediumdeep holes in the mining room,it is concluded that the fanshaped mediumdeep holes have less engineering volume than the parallel mediumdeep holes and a small cuttocut ratio of 1,000 tons.The fanshaped mediumdeep hole mining method has been popularized and applied in steeply inclined thin veins,and has achieved certain economic benefits.

Key words: steep,thin ore body,scallop hole,parallel hole