Abstract: To extract the inclined medium-thick orebodies safely and effectively at Lubambe Copper Mine， longitudinal room and pillar mining with flat bottom structure was derived from sub-level open stope mining. Rooms and pillars at sub-levels were arranged at a staggered way along the longitudinal direction of orebodies. The developing roadways can also be utilized as drilling and mining roadways. The application results showed that the mining-cutting ratio of the longitudinal room and pillar mining was only 8.73 m/kt， the recovery rate was 72.2%， the ore dilution rate was 22%， and the production capacity reached 1 000 t/d. Additionally， the double-boom jumbo was introduced to drill the upward parallel medium-length boreholes. By this method， only 3~4 boreholes per row were arranged when the ore thickness was 5 m， and the blasted ore tonnage per meter reached 8~9 t， with the large boulder rate decreased apparently.

Key words: Flat bottom structure, Longitudinal room and pillar mining, Staggered arrangement, Upward parallel medium-length boreholes