pillar extraction

常见例句

So pillar extraction is a problem to be solved presently.
因此煤柱的回收是目前急需解决的问题。
In order to solve the technical problems of mining strip extraction coal-pillar and waste disposal, the waste substitution extraction is proposed.
针对建下条采煤柱回收和井下矸石处理的重大技术难题，提出矸石置换开采。
A long-term practice has proved that the pillar extraction method is suitable not only for the recovery of orebody no. 8 in this mine but also achieves better economic effects.
经过多年的生产实践证明，此种矿柱回采方案对东桐峪金矿8号脉矿柱的回采是适宜的，并且收到了较好的经济效益。