“Sub-surface mining consists of digging tunnels or shafts into the earth to reach buried ore deposits. Ore, for processing, and waste rock, for disposal, are brought to the surface through the tunnels and shafts. Sub-surface mining can be classified by the type of access shafts used, the extraction method or the technique used to reach the mineral deposit. Drift mining utilizes horizontal access tunnels, slope mining uses diagonally sloping access shafts and shaft mining consists of vertical access shafts. Mining in hard and soft rock formations require different techniques.”
Wikipedia entry on Hard Rock Underground Mining Wikipedia entry on Soft Rock Underground Mining[embedyt]http://www.youtube.com/watch?v=649dZPCTD30[/embedyt]>
[embedyt]http://www.youtube.com/watch?v=t2WoMaXizHs[/embedyt]
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