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A coalfield is an area of certain uniform characteristics where coal is mined. The criteria for determining the approximate boundary of a coalfield are geographical and cultural, in addition to geological. A coalfield often groups the seams of coal, railroad companies, cultural groups, and watersheds and other geographical considerations.
A History Of Coal Mining In Great Britain (1882) Online at Open Library; Griffin, A. R. The British coalmining industry: retrospect and prospect. 1977. Hanley, James. Grey Children: A Study in Humbug and Misery. 1937. Hatcher, John, et al. The History of the British Coal Industry (5 vol, Oxford U.P., 1984–87); 3000 pages of scholarly history
Giridih Coalfield is spread over an area of 28.5 km 2 (11.0 sq mi). It has 20 seams. The Lower Karhabari seam, 3 to 7.5 m (9.8 to 24.6 ft) thick, has the finest coking coal in India. Other important seams are Upper Karhabari and Bandhua seams. The reserves are estimated at 17.3 million tonnes. [2]
In the United States of America, between 1990 and 1999, about 22.3 billion kilograms of explosives were used in mining quarrying and other industries; Moreover "coal mining used 66.4%, nonmetal mining and quarrying 13.5%, metal mining 10.4%, construction 7.1%, and all other users 2.6%".
Coal played an important role in industry in the 19th and 20th century. The predecessor of the European Union, the European Coal and Steel Community, was based on the trading of this commodity. [73] Coal continues to arrive on beaches around the world from both natural erosion of exposed coal seams and windswept spills from cargo ships.
Ore grade, the amount of a desired mineral or metal that a quantity of ore contains high grade ores are rich in the mineral desired, low-grade ores have less of the mineral desired; Gangue, minerals within the ore that are not desired; these are removed during ore processing; Vein (geology) a geological formation that often contains ore
Coal mining is the process of extracting coal from the ground or from a mine. Coal is valued for its energy content and since the 1880s has been widely used to generate electricity. Steel and cement industries use coal as a fuel for extraction of iron from iron ore and for cement production.
Lignite (derived from Latin lignum meaning 'wood'), often referred to as brown coal, [1] is a soft, brown, combustible sedimentary rock formed from naturally compressed peat.It has a carbon content around 25–35% [1] [2] and is considered the lowest rank of coal due to its relatively low heat content.