Mica-mining methods, costs, and recoveries at no. 10 and no. 21 mines of the Spruce Pine Mica Co., Spruce Pine, N.C.
| Author: | Urban, H. M. |
|---|---|
| Year: | 1932 |
| Document Type: | USBI |
| Issuing Agency: | U.S. Dept. of Commerce, Bureau of Mines, |
| SUDOC: | I 28.27:6616 |
| Series: | Information circular / Bureau of Mines ; |
| Report Number: | 6616 |
| Subjects: | Mica--North Carolina |
| Mining engineering--North Carolina | |
| Link: | https://hdl.handle.net/2027/mdp.39015086485482 |