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Coal was discovered in Kentucky in 1750. Since the first commercial coal mine opened in 1820 coal has gained both economic importance and controversy regarding its environmental consequences. As of 2010 there are 442 operating coal mines in the state. ==History== Just two years after the first coal was discovered in the United States in 1750 explorer Thomas Walker discovered coal in what would become Kentucky and used it to heat his camp fire. Although his discovery came in the Eastern Coalfield it would be another 150 years before commercial coal production occurred there. In 1820 the first commercial coal mine in Kentucky opened in the Western Coalfield in Muhlenberg County. In its first year the mine produced 328 tons of coal. By 1843 the state produced 100,000 tons of coal, and by 1879 the state produced one million tons of coal, all coming from the Western Coalfield. In 1900 the first commercial coal was opened in the Eastern Coalfield in the community of Betsy Layne in Floyd County. Coal mining experienced rise and fall throughout most of the early to mid 20th century. The two World Wars made for periods of boom. The first was followed with a severe bust, brought on by the end of the Great War and then continued by the Great Depression. Following World War II, the drive toward mechanization and the Korean War pushed the industry even higher. However, railroads and households soon began shifting from coal to oil and gas for their energy needs, and the industry yet again experienced a downturn.〔 By the mid 1950s, surface mining became the response to lower coal prices and lower demand. The process involved fewer workers and no "mining" in the traditional sense. It was during this time that the first strip mine control bill was enacted.〕 By 2001 8.36 billion tons of coal had been extracted from Kentucky, 5.78 billion tons coming from the Eastern Coalfield and 2.58 billion tons coming from the Western Coalfield.〔url=http://www.uky.edu/KGS/coal/production/kycoal01.htm〕 As of 2004 around 13% of total coal reserves have been extracted from the Western Coalfield, although much of the remaining 87% of reserves are not reachable with current technology. Around 19% of coal reserves have been extracted from the Eastern Coalfield. Two phenomena have resulted in a major reduction in the number of mine workers and number of mines in Kentucky(). First, increased mechanization in both Kentucky coal fields has reduced the need for labor. This has become even more pronounced with the emergence of strip mining. Secondly, acid rain regulation found in the 1990 Clean Air Act Amendment has made Kentucky coal, with its medium to high sulfur content, less desirable. That amendment requires companies to either remove the sulfur through scrubbers or switch to low-sulfur coal, found in Western states like Wyoming or submit to fines for their sulfur production.〔http://www.kltprc.net/books/contextofchange/Chpt_9.htm〕 While comparably higher in sulfur content, the Eastern Kentucky coal does have a higher carbon density than Wyoming coal, so less of it has to be burned to produce the same amount of electricity, thus producing less per capita carbon dioxide emissions. Eastern coal remains widely used across the United States. The Western Coalfield has been hit much harder by acid rain regulations. Whereas about half of Eastern coal is high in sulfur content, nearly all Western coal falls into this category. In recent years the state government has been seeking to land so called "coal to gas" operations that convert coal into liquid fuels that closely resemble either natural gas or petroleum. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Coal mining in Kentucky」の詳細全文を読む スポンサード リンク
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