But deposits large and concentrated enough to be worth mining are indeed rare.

但是，沉积或富集到有开采价值的却实在难找。

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Such concentrated deposits ought to make underwater mining highly efficient.

这样的集中式分布可以使水下开采效率大大提高。

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Instead, Chinese Banks have focused on buying small stakes in multinationals while resources companies have concentrated on individual mining projects.

中国的银行一直在专注于购买跨国企业少数股权，资源公司则把注意力放在单个矿业项目上。

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Global X Funds recently released their Uranium ETF, highly concentrated in Canada, one of the world's prime mining destinations.

FORBES: Magazine Article

Uranium ETF ( URA - news - people ), highly concentrated in Canada, one of the world's prime mining destinations.

FORBES: Commodities