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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.
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Coal
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 ...
average daily production
Energy; Coal
The ratio of the total production at a mining operation to the total number of production days worked at the operation.
average delivered price
Energy; Coal
The weighted average of all contract price commitments and market price settlements in a delivery year.
average household energy expenditures
Energy; Coal
A ratio estimate defined as the total household energy expenditures divided by the total number of households.
average mine price
Energy; Coal
The ratio of the total value of the coal produced at the mine to the total production tonnage.
average production per miner per day
Energy; Coal
The product of the average production per miner per hour at a mining operation and the average length of a production shift at the operation.
average production per miner per hour
Energy; Coal
The ratio of the total production at a mining operation to the total direct labor hours worked at the operation.
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