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

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