The local citizens and activists of Coal River mountain Watch want Massey Energy to return to tunnel mining and use the mountaintop for a wind installation.

当地居民和“Coal River山看护者”的活动家们试图让Masey Energy公司重新使用隧道采矿法，并且利用山顶建造风电。

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The interchanging tunnel mining method is suggested on bases of careful feasibility study in both technologically and economically. A new method is developed for recovering the large amount of o…

并提出了进路间隔回采方案，从技术和经济两方面作了详尽的可行性分析，为我国大量残留矿资源的回收探索了一条新路。

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In one segment of the 45-minute video, which was edited down to five minutes before broadcast, a mining vehicle is driven down a tunnel.

在这段45分钟的视频里有一小段视频，后来在播出之前被编缩为5分钟，里面可以看到一采矿车辆正沿坑道行驶。

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Many of these mining engineers have already worked on projects like the Channel Tunnel and the Jubilee line extension so they're not easily impressed.

BBC: Crossrail: Passion deep below west London

Mining firm Freeport said at least four miners were rescued at its Grasberg mine after an underground tunnel collapsed early on Tuesday.

BBC: Freeport's Grasberg copper mine