我去一个封闭的祖母绿矿在澳大利亚。

I went to a closed Emerald mine in Australia.

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这张太空照片为我们展示了位于亚利桑那州绿谷镇（Green Valley，位置见文末图）西部及西北部的三个露天矿。

This astronaut photograph illustrates three open-pit mines located west-northwest of the town of Green Valley, Arizona.

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绿片岩相以下的动力变质作用是矿化富集的条件。

Dynamical metamorphism under greenschist facies is the condition of mineralizing enrichment.

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