coal mining new equipment

CHAPTER 11 Mining Technology - Princeton University- coal mining new equipment ,New Equipment Developments. . . . .., ... CHAPTER 11 Mining Technology The Federal Coal Leasing Amendments Act of 1976 charged OTA to assess the feasibilityCoal mining | World Coal AssociationOver 7269 million tonnes (Mt) of hard coal are currently produced worldwide and 787 Mt of lignite. Coal is mined by two methods: surface or 'opencast' mining, and underground mining.