coal | National Geographic SocietyDec 22, 2012 . Coal exists in underground formations called "coal seams" or "coal beds. . However, peat is still considered part of the coal "family" because it contains .. Today, almost a third of American coal mines use longwall mining. . Columns (pillars) of coal support the ceiling and overburden. . Synthetic Productsuse of geo synthetic as a part of support in under ground coal mining,New Mining and Geosynthetics Document from NAUE - NAUE AsiaMay 10, 2017 . International geosynthetics manufacturer NAUE & Co. . and supports with design experience all of the geosynthetics essential to mine . From underground coal mines to mountain top gold heap leach pads, NAUE.
use of geo synthetic as a part of support in under ground coal mining