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Acid Formation.--To develop Advanced-Technology Face Advancing Coal Mining Appalachian Coal Province backfilling Bacteriocides Bacteriophage Beckley Coalbed Blacksville blind shaft borer Borehole Bureau of Mines coal mining industry Coal Mining Technology coal seams Coal Waste Utilization Combustion Engine Concepts Conventional and/or Resin cost Degasification DEMONSTRATION IN FISCAL Demonstration.--To Develop and demonstrate develop improved developed concepts directional drilling Directional Hole Division of Mining dragline effective environmental fiscal year 1977 Goal Develop haulage system Haulback Mining improved system technology Information circular Inhibit Mine Acid Internal Combustion Engine longwall mining methane mining machines Mining Research—Resources Mining Technology program MINING TECHNOLOGY RESEARCH Mining.--To multiple seams Pocahontas problems associated Project Description pyritic rail haulage reclamation resource recovery roof support safety Shortwall Mining Method Shotcrete Spontaneous Combustion Problems subject the developed Subprogram Problem surface mining technical and economic techniques Terrace Pit Mining U.S. Coal U.S. coalfields U.S. conditions underground coal mines underground mining Western Coal