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Coal Drilling Database

glossary of coal mining terms,bench - one of two or more divisions of coal seam separated by slate or formed by the process of cutting the coal. berm - a pile or mound of material capable of restraining a vehicle. binder - a streak of impurity in a coal seam. bit - this hardened and strengthened device at the end of a drill rod that transmits the energy of breakage to the rock..shandong china coal group drilling machine branch,shandong china coal group drilling machine branch a large enterprise of national high-tech zone, is an e-commerce enterprise as well as a manufacturing enterprise that cultivated by jining city. the mining amp construction equipment that the company handled has been sold to 28 provinces and cities nationwide and exported to more than 146.

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