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 were 442 operating coal mines in the state, and as of 2017 there were fewer than 4,000 underground coalminers. 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 mine 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. Diana Baldwin and Anita Cherry are believed to have been the first women to work inside an American coal mine, and were the first women to work inside a mine who were members of the United Mine Workers of America. They began that work in 1973 in Jenkins, Kentucky. 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. As of 2004 around 13% of total coal reserves had been extracted from the Western Coalfield, although much of the remaining 87% of reserves were not reachable with current technology. Around 19% of coal reserves had been extracted from the Eastern Coalfield. Two phenomena have resulted in a major reduction in