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.
以净现值最大为优化目标，同时考虑采、选、冶三阶段因素，给出了地下开采矿体边界品位动态优化的方法。
Taking maximum net present value as an optimum target and considering factors in mining, milling and metallurgy, a dynamic optimum method for optimizing cutoff grade of underground orebody is given.
该模型考虑矿体的开采顺序和矿床不同区段的品位分布，实现了地下开采边界品位在时间和空间上的动态结合。
The model considers the mining order and the grade distribution in different deposit sections and has realized the time-space dynamic combination of the cutoff grade in underground mining.
在320铀矿床常规开采条件下，要求铀矿资源(金属量)利用程度不低于原情况的95%时，选择的边界品位为0.045%。
Under the normal mining condition and 95% the utilization rate of the uranium resource in 320 uranium Deposit, 0.045% as the marginal grade is recommended.
品位的急剧下降是矿体边界上的规律。
品位的急剧下降是矿体边界上的规律。
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