pillar mining meaning in English

矿柱回采法
留矿柱的采矿
煤柱回收
柱式开采法

Pillar drawing in room - and - pillar mining at jinshan gold mine
金山金矿房柱法开采的矿柱回采
Repair of roadway without pillar mining
无煤柱开采其巷道的维护
Study of mine pressure with room - pillar mining in nantun coal mine
南屯煤矿房柱式开采矿山压力研究
Technical analysis on feasibility of new room and pillar mining method
新型房柱式采煤法可行性技术分析
Test research on permanent pillar mining with coal refuse backfilling
矸石充填巷式开采永久煤柱试验研究

More: Next