The crown pillar of stope is permanent loss and not recoverable, while sill pillar and barrier pillar shall be recovered after the ore drawing work is completed.
采场的顶柱作为永久矿柱损失，采场底柱、间柱等采场大量放矿完毕后，一次性进行回收。
Cut-off grade method has been used to control the ore drawing in non-pillar sublevel caving mining both in and outside China.
采用无底柱分段崩落采矿法，国内外一直采用截止品位放矿法来控制出矿。
Population and application of the dilution ratio ore drawing method has certain social value and economic value for implementation of the sill pillar-free subdrifting method.
低贫化放矿的推广应用对于实行无底分段崩落法的矿山具有一定的社会价值和经济价值。
Using straight-pillar orientation, push rod top expected, leading to complete drawing of patterns and winning ways of pumping core materials and components for the choice.
利用直导柱导向，推杆顶料，斜顶杆完成脱模及内抽芯方式并对模具的材料进行了选择。
Using straight-pillar orientation, push rod top expected, leading to complete drawing of patterns and winning ways of pumping core materials and components for the choice.
利用直导柱导向，推杆顶料，斜顶杆完成脱模及内抽芯方式并对模具的材料进行了选择。
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