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

Bench sample

Energy; Coal

A face or channel sample taken of just that contiguous portion of a coalbed that is considered practical to mine, also known as a "bench;" For example, bench samples may be taken of minable coal ...

Domestic vehicle producer

Energy; Coal

An Original Vehicle Manufacturer that assembles vehicles in the United States for domesticuse. The term "domestic" pertains to the fifty states, the District ofColumbia, common wealths, territories, ...

Average household energy expenditures

Energy; Coal

A ratio estimate defined as the total household energy expenditures divided by the total number of households.

Code of federal regulations

Energy; Coal

A compilation of the general and permanent rules of the executive departments and agencies of the Federal Government as published in the Federal Register. The code is divided into 50 titles that ...

Drilling and equipping of wells

Energy; Coal

The drillingand equipping of wells through completion of the "christmas tree."

Composite sample

Energy; Coal

A recombined coalbed sample produced by averaging together thickness-weighted coal analyses from partial samples of the coalbed, such as from one or more bench samples, from one or more mine ...