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Stone Machine Boring For Silica Mining

Chinese. A tunnel boring machine (TBM), also known as a "mole" is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata.They may also be used for microtunneling.They can bore through anything from hard rock to sand.Tunnel diameters can range from one metre (3.3 ft) (done with microTBMs) to 17.6 metres (58 ft) to date.

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