It is suitable for underground mining of solid are deposit on which earth surface subsidence is allowed, angle of inclination is below 35 degree, its thickness is 5-15m. The features of this invention as follows: ore strip is perpendicular to orebody strike and is divided at certain interval. Ore pillars are not remained in the stope. Drilling and orehandling are not in the vacant place and orehandling is in the lower end of vacant place. The top failure is carried out step by step with extraction and a kind of shovel type pit car is designed for end orehandling. The ore loss rate is not more than 10%, depletion rate is not more than 10%. The orehandling capacity in shift may attain to 250 tons and above. Compared with general mining method, the ore exctraction cost is lower by 20~30%. |