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Glossary of Mining Terms - Kentucky Coal Education

Abutment - In coal mining, (1) the weight of the rocks above a narrow roadway is ... Area (of an airway) - Average width plied by average height of airway, expressed ..... Among the various types of crushers are the ball mill, gyratory crusher, ... Dummy - A bag filled with sand, clay, etc., used for stemming a charged hole.

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Crusher - Wikipedia, the free encyclopedia

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Noncoal Mines and Quarries | DEP > Mining

'Noncoal' is any mined commodity that isn't coal or peat. ... Mineral deposits (that are not consolidated rock) of sand and gravel are also used. ... Shale can be extracted fairly easily, without crushing, for similar purposes. ... Pennsylvania bluestone from the northern counties is highly prized and is exported to other areas.