Tunnel boring machine - WikipediaA tunnel boring machine (TBM), also known as a "mole", is a machine used to excavate tunnels .. Nevertheless, TBM development continued in potash and coal mines, where the rock was softer. A TBM with a bore diameter of 14.4 m (47 ft 3.artisinal mine tunnelling machines,artisinal mine tunnelling machines,Application of Tunnel Boring Machines in Underground - Inside Minesand blast operation, yet overall tunneling costs could. Application of Tunnel Boring Machines in Underground Mine. Development. M. Cigla, S. Yagiz & L.
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