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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
calorific value
Energy; Coal
The amount of heat in BTU's that is release by burning one pound of coal.
bridge carrier
Energy; Coal
A mobile carrier on rubber tires. It is used as an intermediate between the mining machine and an entry conveyor.
cannel coal
Energy; Coal
Can also be called candle coal, it has a high percentage of hydrogen. It is easy to ignite, burns with a bright yellow flame and leaves behind very little ash. It was a used as a light source in ...
brattice or brattice cloth
Energy; Coal
A material that is used to partition a mine for air ventilation. Can be made from concrete, plastic, cloth or other materials.
check curtain
Energy; Coal
A usually temporary curtain, often called a brattice cloth, hung and used to ventilate the air current to a suitable place within the mine.
chain pillar
Energy; Coal
A pillar that runs parallel to the entrance or main gangway in a mine for protection.
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