所谓境界内的低品位矿石,是指在已圈定的露天开采境界内,未计算工业储量,含铜品位低于0.3％边界品位的那部分矿石。它是露天境界内采剥总量的一部分。无论是利用还是排弃,在其它条件不变化的情况下,基本不影响采矿场的投资和生产费用。如果利用,只需增加处理这部分矿石的有关投资和成本。合理利 Low-grade ores in the so-called realm refer to the part of ores within the bounds of open-pit mining that have not been calculated for industrial reserves and have a grade of copper below 0.3%. It is part of the total amount of mining in the open air. Regardless of whether it is used or abandoned, the investment and production costs of the mining field will not be affected basically under the condition of no change in other conditions. If used, it is only necessary to increase the investment and costs involved in handling this part of the ore. Reasonable profit