Method and cost of driving the Rock Creek Tunnel, Hecla Mining Co., Shoshone County, Idaho

Author:	Butner, D. W.
Year:	1949
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7525
Series:	Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number:	7525
Subjects:	Tunneling--Idaho--Shoshone County--Technique
	Tunneling--Idaho--Shoshone County--Costs
	Silver mines and mining--Idaho--Shoshone County
Link:	https://hdl.handle.net/2027/mdp.39015078463521