1 品位指标的缺点 国外普遍用单品位指标———边际品位（Cut off grade），国内普遍用双品位指标———边界品位 （Margina grade）和工业品位（Pay grade）。
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【Key words】 Intelligent Optimization； Cut-off Grade； Grade of Crude ore； Data Simulation； Evolution-neural Integration；
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cut-off grade 边界品位 ; 品位下限 ; 截止品位 ; 边际品位
grade cut-off point 分成数线
Cut-off-grade 截止品位
ore cut off grade 矿石边界品位
ore cut-off grade 矿石边界品位
Cut-off grade method 边界品位法
Optimal cut-off grade 最佳边界品位
cut off grade drawing 截止品位放矿
cut-off grade drawing 截止品位放矿
The greatest height of footwall cutting is determined through the theoretical analysis of cut-off grade method and breakeven point method.
通过对边界品位法及盈亏平衡法的理论分析，确定下盘最大切岩高度。
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.
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。
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。
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