How is coal mined and extracted? | Planète ÉnergiesJul 7, 2015 . Extracting coal from underground or open-pit mines continues to be a . a process that removes sand and mud by immersing the coal in a . 240 meters: The length of the biggest excavator used to extract the coal from an open-pit mine . The biggest of these machines is 240 meters long (longer than two.process and machinery used to extract coal,Coal Mining and Processing | Energy Trends InsiderCoal miners use giant machines to remove coal from the ground. . Surface mining is used to produce most of the coal in the U.S. because it is less expensive . elevators down deep mine shafts where they run machines that dig out the coal.
process and machinery used to extract coal