PROJECT PROFILE A coal preparation plant with below- grade tunnels and 105-foot-high, rein- forced-concrete stacking tubes was built on a previously strip-mined site in western Indiana. The plant had Raw and Clean Coal Conveyor Tunnel sec- tions that were 20 feet wide and 600- and 1280-feet-long respectively. The site had been reclaimed by placing ex- cavated overburden rock and soil (mine spoil) back into the mined areas as fill,

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