Up and down the Madre DE Dios River, people mine for gold.

马德雷德迪奥斯河上下游正在开采金矿的工人。

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What's more, the estimated 10 million to 20 million workers who mine for gold this way will all too often inhale the mercury, putting their health at profound risk.

更为严重的是，估计有1000万至2000万的工人用这种方法炼金，他们都频繁地吸入汞，把健康置于严重的危险之中。

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It is a gold mine for social scientists.

这对社会科学来说是一座金矿。

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He was a mine manager in Leadville who developed a way to safely mine for gold deeper than before.

VOA: special.2010.03.08

It was used for an oil well or gold mine that had almost no oil or gold in it.

VOA: special.2009.11.08

Homestake operated as a gold mine for one hundred twenty-five years before closing about nine years ago.

VOA: special.2009.07.21

After leaving Kinross, he founded Allied Nevada in 2007 around a Nevada gold mine, just as the price for gold started to soar.

FORBES: The Gold Crash Is Crushing Gold Mining Stocks

In fact, the mine design submitted to the Salvadoran authorities would set a new precedent for water protection for any gold mine in the Americas, including the United States.

FORBES: Gold Rushes, Trade Agreements, and How Companies Sue Countries

But this horde of documents is going to prove a gold mine for academic research.

BBC: Wikileaks: Bumpy ride ahead for US diplomats