Glossary of Mining Terms Coal EducationA. 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

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Underground mining (hard rock) WikipediaUnderground hard rock mining refers to various underground mining techniques used to excavate hard minerals, mainly those containing metals such as ore c

Open-pit mining WikipediaOpen-pit, open-cast or open cut mining is a surface mining technique of extracting rock or minerals from the earth by their removal from an open pit or borrow.Copper mi