Basic estimated capital investment and operating costs for underground bituminous coal mines developed for longwall mining :mines with annual production of 1.5 and 3 million tons by longwall mining from an 84-inch coalbed

Author:	Duda, J. R.
Additional Authors:	Hemingway, E. L.
Year:	1976
Document Type:	USBI
Issuing Agency:	United States Department of the Interior, Bureau of Mines,
Series:	Information circular / Bureau of Mines ;
Report Number:	8715.
Subjects:	Coal mines and mining
	Bituminous coal
Link:	https://hdl.handle.net/2027/mdp.39015078464115