Tunneling/Face drilling
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Underground rock excavation. Tunneling. Tunneling is the most frequently occurring underground operation which also forms part of the construction of rock chambers etc. and is normally an integral part of mining operations. Tunnels can be divided into three categories on the basis of the size of their cross sections: · Small tunnels, 4 – 20 mē. · Medium size tunnels, 20 – 60 mē . Large tunnels, over 100 mē |
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Last Modified05/30/2005