Basic estimated capital investment and operating costs for underground bituminous coal mines developed for longwall mining /
| Main Authors: | , |
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| Corporate Author: | |
| Format: | Government Document Book |
| Language: | English |
| Series: | Information circular (United States. Bureau of Mines) ;
8715. |
| Subjects: |
| Item Description: | Mines with annual production of 1.5 and 3 million tons by longwall mining from an 84-inch coalbed. Chiefly tables. |
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| Physical Description: | 3 unnumbered pages, 25 pages : illustrations ; 26 cm. |