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    Mining: Mining, process of extracting useful minerals from the surface of the Earth, including the seas. A mineral, with a few exceptions, is an inorganic substance ...

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    Drill, blast, load, truck, crush, and process; these operations are at the heart of mining. Here is an overview of drilling from suppliers to technology to equipment.

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    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.

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    Abutment — In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch ...

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    Other kinds of jackhammers. Not all jackhammers use compressed air, so it's a bit misleading to refer to them all, generically, as "pneumatic drills."

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