Preliminary economics of mining a thick coal seam by dragline, shovel-truck, and scraper mining systems
By: by Michael J. Bertoldi.
Contributors: United States. Bureau of Mines.
Series: Information circular - Bureau of Mines ; 8761; Information circular (United States. Bureau of Mines) -- 8761.
Publisher: Dept. of the Interior, Bureau of Mines : for sale by the Supt. of Docs.
Published: 1977
Place of publication: [Washington]
Language: eng
Number of pages: 27
Subjects: Strip mining -- Economic aspects -- United States.; Coal mines and mining -- Economic aspects -- United States.; Coal-mining machinery.
Notes: Bibliography: p. 11-12.