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DIRECTORY OF COAL MINES IN ILLINOIS QUADRANGLE SERIES MORRIS QUADRANGLE GRUNDY COUNTY ... The methods are (1) room and pillar and (2) high extraction.
Coal extraction industry horizontal banners with working miners different equipment and tools in flat style vector illustration Vector 3D isometric illustration ...
pillar extraction using ... Development Face Ventilation. ... This system works quite well and is still in use in some mines where ventilation is not ...
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