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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.

Contributors in Coal


blasting circuit

Energy; Coal

An electric circuit that is used to detonate a primary explosive in a blasting cap.


Energy; Coal

A small hill or mound of material, can refer to the waste material, if in a pile, after digging a large hole.

blasting cap

Energy; Coal

A device containing a primary explosive that is sensitive to heat and shock. The blasting cap is used to start the denotation of the secondary explosive, which for safety reasons is more stable but ...

bituminous coal

Energy; Coal

A soft coal that is considered better than lignite but worst than anthracite. It's about 60-80% carbon with the rest being water, air, hydrogen, and sulfur.

black damp

Energy; Coal

Term used for when there's an area with low oxygen levels and too much nitrogen, argon, carbon dioxide or water vapor. In mining, this creates a deadly situation where asphyxiation is common.

belt conveyor

Energy; Coal

A mechanical device on which a looped belt carries materials through or out of the mine.


Energy; Coal

The process by which mined material is separated from waste through treatment.

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