grade index optimization 品位指标优化
Grade structure optimization 等级结构优化
The determination of the rational highway grade structure is one part of highway network planning, it also is an important content of highway network layout optimization.
公路网合理等级结构的确定，是公路网规划的组成内容之一，也是公路网布局优化的重要组成内容之一。
Base on this, Offer the idea of total and part of the mine optimization consider of the grade distribution and mining methods, then implement it by computer software system.
在此基础上，结合矿山的品位分布和采矿方法，提出整体优化和部分优化的思路，并通过计算机软件系统实现。
From the results we know gross profit and NPV have obviously improved after optimization, so its reasonable for optimization grade index on this mine.
结果表明，优化后该矿的总利润和净现值有了明显的提高，说明将该矿的品位指标进行优化是合理的。
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