[postlink]https://siri-lankawa.blogspot.com/2016/01/how-raise-drill-works.html[/postlink]http://www.youtube.com/watch?v=6QueB4GCQwwendofvid
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Raise drilling is used to create large drill holes -- up to 7.6 meters in diameter. The holes, or tunnels, are used to connect mine shafts, power plant tunnels or channels for rainwater and surplus water, as well as for ventilation between different levels in a mine.
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