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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
Description
Item Description:[With data on air samples and production costs]
Record is based on bibliographic data in ProQuest U.S. Executive Branch Documents, 1910-1932. Reuse except for individual research requires license from ProQuest, LLC.
Electronic resource.
Physical Description:1 online resource (20 pages)
Format:System requirements: PDF reader software.