• As mines age, ore grades decline, since the best stuff is usually dug up first.

    随着矿山年龄的增长,铁矿石等级下滑因为最好往往被最先发掘

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  • As older mines get deeper, ore grades decline and extraction becomes more expensive.

    随着越挖越深矿石的品质下降使提取成本增加。

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  • As older mines get deeper, ore grades decline and extraction becomes more expensive.

    随着越挖越深矿石的品质下降使提取成本增加。

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