对金属矿产资源评估中收益现值法的探讨

收益现值法在进行矿产资源评价时，现行评价不考虑矿石在空间上的品位变化、各块段勘探程度及生产要素对评估值的影响。将整个矿体的平均品位视为矿种的品位，各勘探级别均等同看待，生产要素(如成本、产量、贫化率、损失率等)从投产起一贯不变。这些要素的取值会对计算值产生极大的偏差，都是金属矿产资源评价中需重视的方面。本文试图对这些因素进行改进，采用分期次、分段优化参数后，再进行计算，计算结果较传统计算有了很大改进，较符合实际。

The study in mineral resources evaluation with benefit present value method

During metal mineral resources evaluation, instead of considering the such influencing factors as the special grade of orebody, the segment degree of exploration and the production factors, the present value methods consider the average grade of orebody as segment grade, hold that the exploration degree of ore segments are the same and such producing factors as cost, output, depletion rate and loss rate are consistent from time when the mines start to run. As different value of those factors will bring about notable evaluation deviation, those factors should be taken into consideration during estimation of metal mineral resources. This paper gives the improved method to correct these faults, especially to handle the mineral segments based on different stages. Compared with traditional calculation method, this method is more advanced and is more coincident with practice.