Marginal extraction cost — The cost of mining an additional unit of resource.

边际抽取成本——增加额外一单位资源的我的成本。

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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。

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In order to improve the productivity and reduce the cost of mining, the safety of the equipment used is required as well as the optimizing of the digging device.

为了提高生产率和降低煤矿开采的成本，这就要求所使用的设备具有很高的安全性以及采掘设备的优化配置。

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However, since 2008, the ratio of gold to commodities has surged, slashing the real cost of mining gold by over 60%.

FORBES: Gold Mining Stocks Are An Increasingly Attractive Opportunity

Better yet, the real cost of mining gold is headed lower.

FORBES: Gold Mining Stocks Are An Increasingly Attractive Opportunity

Investors seem to be concerned about what the increasing cost of mining will mean when coupled with a weaker gold price narrowing margins and more pressure on cash flows at gold mines.

FORBES: Gold Mining Stocks Still In Free Fall As Gold Price Stabilizes