Coal mining

Coal is a combustible black or brownish-black sedimentary rock, formed as layers called coal seams. Coal is mostly carbon with variable amounts of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. It is a fossil fuel, formed when plants decay into peat which is converted into coal by the heat and pressure of deep burial over millions of years. Vast deposits formed from wetlands called coal forests that covered much of the tropics during the late Carboniferous and early Permian.

Anthracite, also known as hard coal and black coal, is a hard, compact variety of coal that has a submetallic lustre. It has the highest carbon content, the fewest impurities, and the highest energy density of all types of coal and is the highest ranking of coals.

process of getting coal out of the ground

Firedamp is any flammable gas found in coal mines, typically coalbed methane. It is particularly found in areas where the coal is bituminous. The gas accumulates in pockets in the coal and adjacent strata and, when they are penetrated, the release of the gas can cause explosions. Historically, if such a pocket was highly pressurized, it was termed a "bag of foulness".

Welsh traditional sweet bread made of flour, butter or lard, currants, eggs, milk and spices

human disease

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facility that washes coal of soil and rock, crushes it into graded sized chunks, stockpiles grades preparing it for transport to market

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lumber for use in reinforcing coal mine tunnels

aspect of Indian industry

form of surface mining that involves the mining of the summit or summit ridge of a mountain

occupation

basin with coal deposits

product of coal preparation

a form of underground coal mining where a long wall of coal is mined in a single slice

concept describing peak use of coal in the economy

horse used in mines

Violent underground phenomenon

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