The oldest of the basic underground methods room and pillar mining grew naturally out of the need to recover more coal as mining operations became deeper and more expensive but the power advanced segmented conveyor became a fundamental part of equipment there
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The room and pillar method is often used to mine smaller coal blocks or thin seams and seam recovery ranges from 35 to 70 with higher seam recovery rates applicable where retreat mining is combined with room and pillar mining The other underground mining method commonly used in the United States is the longwall mining method
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