边界品位对露天矿最佳境界及总利润的影响

简要讨论了使露天矿总利润最大的边界品位——盈亏平衡品位——的计算方法,并给出计算公式.通过一个铁矿案例分析边界品位对最佳境界和总利润的影响,结果发现:对于给定的技术经济参数,用于境界设计的边界品位和生产中使用的边界品位均有较宽的合理取值区间,即设计和生产中的边界品位分别在此区间变化,境界总利润几乎与取盈亏平衡品位时相等;对于不同的精矿价格,虽然最佳境界的体积和总利润发生了重大变化,边界品位的合理取值区间却只有微小的差别.

Influence of Cutoff Grade on Optimum Pit Limit and Total Profit

The calculation method of the profit-maximizing cutoff grade, i.e., the break-even grade, is first discussed and an equation is given. The influence of cutoff grade on optimum pit limit and total profit is analyzed through a case study. The findings are as follows: for given economic parameters, the cutoff grade used both in pit limit design and in production can be selected in a relatively wide range. When the cutoff grades in both design and production change in these respective ranges, the total profit of the optimum pits is almost equal to that at the break-even grade. For different concentrate prices, these selection ranges only differ a little, though the volume and the total profit of the optimum pits differ a great deal.