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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The results show that gold extraction cost can be decreased through static state oxidation and cyanide leaching to refractory at suitable conditions.

结果表明，在适宜条件下，对金精矿进行静态氧化、氰化浸出，有助于降低生产成本。

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This means that some wells may even need to undergo desalination after extraction, thus increasing the cost.

这意味着一些井甚至在开采后还需要进行海水淡化，这增加了成本。

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The cost of extraction would be higher than the value of the copper to us.

FORBES: Peak Copper: Worldwatch Institute Gets It Wrong Again

The only pristine rainforests are those which are simply inaccessible because of steep topography or the cost of extraction and transport to the coast.

BBC: Why the West should put money in the trees

Human societies will thus continue to search for new sources of water, but the cost of procuring water is a function of the combined cost of extraction, harvesting, transportation, treatment, storage, and delivery.

UNESCO: Natural Sciences