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

cap block

Energy; Coal

A flat object placed in between a prop and the roof to ensure proper support.

brushing

Energy; Coal

Removing material from the bottom or the top of a mine's roadway to create sufficient room.

car

Energy; Coal

Refers to the wagon used to carry personal, coal or other materials.

carbide bit

Energy; Coal

A bit made by attaching molded tungsten carbide to a steel bit shank. It is used for cutting or drilling rock and coal. Also known as a cemented tungsten carbide.

Outcrop

Mining; Coal

Coal that is found on or near the surface.

Acid deposition

Energy; Coal

Refers to both wet deposition and dry deposition. Both occur as a result of ammonium, carbon, nitrogen, and sulphur mixing with water molecules to create a higher acidity than the average pH of 5.2 ...

Balancing authority (electric)

Energy; Coal

The responsible entity that integrates resource plans ahead of time, maintains load-interchange-generation balance within a Balancing Authority Area, and supports Interconnection frequency in real ...