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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
Degasification system
Energy; Coal
The methods employed for removing methane from a coal seam that could not otherwise be removed by standard ventilation fans and thus would pose a substantial hazard tocoal miners. These systems may ...
Channel sample
Energy; Coal
A sample taken at the exposed coal in a mine by cutting away any loose or weathered coal then collecting on a clean surface a sample of the coal seam by chopping out a channel of uniform width and ...
Domestic inland consumption
Energy; Coal
Domestic inland consumption is the sum of all refined petroleum products supplied for domestic use (excludes international marine bunkers). Consumption is calculated by product by adding production, ...
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.
Bypassed footage
Energy; Coal
Bypassed footage is the footage in that section of hole that is abandoned as the result of remedial sidetrack drilling operations.
