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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
Available but not needed capability
Energy; Coal
Net capability of main generating units that are operable but not considered necessary to carry load and cannot be connected to load within 30 minutes.
Coal sampling
Energy; Coal
The collection and proper storage and handling of a relatively small quantity of coal for laboratory analysis. Sampling may be done for a wide range of purposes, such as: coal resource exploration ...
Average annual percent change (coal)
Energy; Coal
The average annual percent change over a period of several years that is calculated by taking the nth root (where n is the number of years in the period of interest) of the result of the current ...
Buy-back oil
Energy; Coal
Crude oil acquired from a host government whereby a portion of the government's ownership interest in the crude oil produced in that country may or should be purchased by the producing firm.
Average production per miner per hour
Energy; Coal
The ratio of the total production at a mining operation to the total direct labour hours worked at the operation.
