边界品位是矿产工业要求的一项内容，是计算矿产储量的主要指标，用以区分矿石与废矿的临界品位。
提出和建立了确定最优次边界品位的比较完整的理论方法。
The method for determining the optimum sub-cutoff grade is developed.
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。
The greatest height of footwall cutting is determined through the theoretical analysis of cut-off grade method and breakeven point method.
这4项品位指标依次为边界品位、边际品位、经济品位和矿床平均品位。
They are respectively named cut-off grade, marginal grade, economic grade and the average grade of an ore deposit.
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