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coal mining terminology

coal mining terminology

4 99 Glossary of Mining Terms RPMGlobal 99 Glossary of Mining Terms RPMGlobal 5 Angle of Draw in coal mine subsidence this angle is assumed to bisect the angle between the vertical and the angle of repose of the material and is 20° for flat seams For dipping seams the angle of break increases being 358° from the vertical for a 40° dip

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