认为下盘放矿点位置与矿体倾角、放矿截止品位、围岩含矿品位有着密切的关系。
It is concluded that location of foot-wall drawing points are closely related to orebody dip, cut-off grade and ore grade of wall rock.
在获取矿石技术经济指标的基础上，对截止放矿品位进行了优选政策。
Based on the technical and economical index, an optimal decision for the cutoff grade of ore drawing is presented.
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。
Cut-off grade method has been used to control the ore drawing in non-pillar sublevel caving mining both in and outside China.
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