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|
Comparative shortwall and room-and-pillar mining costs
| Author: | Green, Larry E. |
|---|---|
| Additional Authors: | Palowitch, Eugene R. |
| Year: | 1977 |
| Document Type: | USBI |
| Issuing Agency: | Dept. of the Interior, Bureau of Mines, |
| SUDOC: | I 28.27:8757 |
| Series: | Information circular - Bureau of Mines ; |
| Report Number: | 8757 |
| Subjects: | Pillaring (Mining) |
| Mining engineering | |
| Link: | https://hdl.handle.net/2027/mdp.39015078453746 |
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