I can't visualize what's happening when they move the jacks and let the roof col... | Hacker News

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		nate_meurer on June 8, 2015 \| parent \| context \| favorite \| on: How my father gave me a terrifying lesson at 10 I can't visualize what's happening when they move the jacks and let the roof collapse. Obviously they don't let it trap them, but I don't understand where the face, cutter, and jacks are in relation to the tunnel that lets them in and out. Does anyone here know?

Turing_Machine on June 8, 2015 | [–]

It sounds like they were using this technique:

http://en.wikipedia.org/wiki/Longwall_mining

nate_meurer on June 8, 2015 | | [–]

Thanks! Those hydraulics are unreal.

krupan on June 8, 2015 | [–]

This video (apparently marketing material from CAT) helped me understand it: https://www.youtube.com/watch?v=bXORrVmxwbM

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