Glossary of Mining Terms 2016-12-20 · 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 of strata spanning the roadway; and (2) the weight of the rocks over a longwall face is transferred to the front abutment, that is, the solid coal ahead of the face and the
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Leer masLignite - Wikipedia, the free encyclopedia. Lignite, often referred to as brown coal, is a soft brown coustible sedimentary rock formed from naturally compressed peat It is considered the lowest rank of coal due to its relatively low heat content It has a carbon content around 25-35%
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