一、按最大总盈利的原则确定露天矿最优境界深度的含义目前国内在确定露天矿境界时,基本上采用露天开采成本与地下开采成本相等的原则,其常用方法之一是使露天矿的境界剥采比等于 First, according to the principle of the maximum total profit to determine the optimal depth of the open-pit mine the meaning of At present, when determining the level of open-pit mines in the country, basically the cost of open-pit mining and underground mining costs equal to one of the common method is to make open-pit mines State stripping ratio equal to