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本文定性论述了采矿工程从地质模拟到选矿终了递增的矿石损失和贫化。假设矿石品位频率函数为对数正态函数，则可利用矿床的净现值简单理论模型求出使净现值达到最大的生产速率和边界品位的决策对．然后将不同的矿石损失和贫化值运用于最优的净现值，再计算作为矿石损失和贫化函数的递减的净现值以及递增的金属生产成本和金属损失．
This paper qualitatively expounds the ore loss and depletion of mining engineering from geological simulation to the end of beneficiation. Assuming that the ore grade frequency function is a logarithmic normal function, the decision pair that maximizes the net present value and the grade of the boundary can be found by using the simple theoretical model of the net present value of the deposit. Different ore loss and depletion values are then applied to the optimal NPV and the declining net present value as a function of ore loss and depletion, as well as incremental metal production costs and metal losses, are calculated.