Sublevel caving technique has been utilized in Datong mining area under hard rock and hard coal, problems including low recovery ratio and spontaneous fire in gob have been overcome to achieve safe and high prodction.

• 大同煤矿集团“两硬”条件侏罗纪厚煤层下分层工作面应用低位放顶煤开采技术,解决了传统工艺所造成的煤炭资源回收率低、空区自然发火危险程度高等技术难题,实现了安全高效开采的目的。