目前确定露天矿境界深度的原则基本上采用静态经济观点。然而由于一个矿山的生产时间往往要持续十多年,甚至更长,加之各矿床的矿石品位、储量分布及覆盖层厚度各不相同,所以,应该用动态经济观点来考虑这个问题。按最大现值的原则确定合理的露天开采境 At present, the principle of determining the depth of open pit basically adopts the static economic point of view. However, since the production time of a mine often lasts for more than a decade or more, and the ore grade, reserve distribution and cover thickness vary from mine to mine, the issue should be considered in a dynamic economic perspective. According to the principle of the maximum present value to determine a reasonable open pit environment