Deep mining methods, Conglomerate mine of Calumet and Hecla Consolidated Copper Company.

Bibliographic Details

Corporate Author:	Calumet and Hecla Consolidated Copper Company
Other Authors:	Vivian, Harry
Format:	Government Document eBook
Language:	English
Published:	Washington, D.C. : [publisher not identified], 1931.
Series:	Mines Bur. Info. Circ. No. 6526
Subjects:	Mining engineering. Electronic books.
Online Access:	Connect to the full text of this electronic document