Bingham Canyon Mine 全球最大的人工开凿矿场

en.wikipedia.org/wiki/Bingham_Canyon_Mine

除了长城， 在太空能见到的另一个人造工程就是这个铜矿。别看在图片里卡车似乎像玩具车， 事实上，轮子直径超过2米。每个车轮价值3万美金。

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