Coal

Coal

Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. Coal is composed primarily of carbon along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen.

Industry: Energy

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Coal

conveyor

Mining; Coal

A device used to transport material through the use of pulleys and usually a rubber belt.

core sample

Mining; Coal

A sample drilled from an area for the purpose of analysis. It is typically a 1 to 5 inch cylinder.

crop coal

Mining; Coal

The exposed portion of a seam of coal that is sometimes of second-rate quality because of oxidation.

crosscut

Mining; Coal

An horizontal entry that is usually perpendicular from the shaft to the vein of coal.

cross entry

Mining; Coal

An entry that is at an angle, many time a right angle, from the main entry.

crusher

Mining; Coal

A machine used to reduce rocks or other materials into manageable pieces for separation or simply into fine dust. A jaw crusher, gyratory crusher, cone crusher, impact crusher, and a horizontal ...