By chemically extracting nickel form the ash, they produced 100 pounds of nickel per acre of land at a total cost per pound slightly above that of current mining.
通过化学方法从灰烬中提取镍，他们每英亩土地生产了100磅镍，每磅的总成本略高于目前的采矿成本。
It affects the efficiency of each subsequent production processes such as loading, transportation and fragmentation, and the total cost of mining.
块度大小影响到矿山铲装、运输、破碎等后续生产工序的效率和采矿生产的总成本。
It affects the efficiency of each follow-up producing process and the total cost in mining.
它影响到矿山各后续生产工序的效率和采矿生产总成本。
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