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There are four main mining methods underground open surface pit placer Underground mines are more expensive and are often used to reach deeper Mining techniques have dramatically transformed over many years with technological advances improving efficiency and the safety and health of our people
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According to the Kentucky Department of Mines and Minerals million tons of coal was mined in Kentucky in 62 percent 81 million tons was from Underground mines in the United States are typically operated using one of two different methods room and pillar mining or longwall mining In room and pillar
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