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采矿工业和大多数工业一样,每项作业的成本必须靠相应的收益来补偿。多数矿床都有一些高品位部分和一些低品位部分。回采全部高品位矿石有时候花费很大。究竟可以回采多少矿石是个问题。
Mining Industry Like most industries, the cost of each operation must be compensated by the corresponding benefits. Most deposits have some high-grade parts and some low-grade parts. The recovery of all high grade ore can sometimes cost a lot. How many ore can be recovered is a problem.