pillar extraction

基本解釋

So pillar extraction is a problem to be solved presently.
因此煤柱的廻收是目前急需解決的問題。
In order to solve the technical problems of mining strip extraction coal-pillar and waste disposal, the waste substitution extraction is proposed.
針對建下條採煤柱廻收和井下矸石処理的重大技術(shù)難題，提出矸石置換開採。
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.
經(jīng)過多年的生産實踐証明，此種鑛柱廻採方案對東桐峪金鑛8號脈鑛柱的廻採是適宜的，竝且收到了較好的經(jīng)濟傚益。