Search U.S. government technical reports digitized or harvested by TRAIL.

Keyword Search

Costs of mining under bolted roof and timbered roof in bituminous coal mines

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

Published Year

• 1960-1969 (1)
• 1970-1979 (1)

Subject

• Bituminous coal (2) *
• Coal mines and mining (2) *

Author

• Ackerman, M. J. (1)
• Duda, J. R. (1)
• Hemingway, E. L. (1)
• Wallace, Joseph J. (1)

• About TRAIL
• FAQ
• Join TRAIL
• Contact Us

Search developed and maintained by the University of Washington Libraries
Copyright 2010