Basic estimated capital investment and operating costs for underground bituminous coal mines developed for longwall mining
Subtitle: mines with annual production 1.3 and 2.6 million tons by longwall mining from a 48-inch coalbed
By: by John R. Duda and E. L. Hemingway : Process Evaluation Group-MMRD.
Contributors: Hemingway, E. L.; United States. Bureau of Mines.
Series: Information circular - Bureau of Mines ; 8720; Information circular (United States. Bureau of Mines) -- 8720.
Publisher: U.S. Dept. of the Interior, Bureau of Mines : for sale by the Supt. of Docs., U.S. Govt. Print. Off.
Published: 1976
Place of publication: Washington
Language: eng
Number of pages: 23
Subjects: Bituminous coal -- Costs.; Coal mines and mining -- United States -- Cost of operation.