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you can also check the durham mining museum and ian winstanley's site.i have also used pit terminology glossary used in coal mining a publication compiled by
chapter underground mining methods and applications production headframe hans hamrin troduction ore is an economic concept.it is defined as a .
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a.abutment in coal mining, 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
abutment — in coal mining, 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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