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Copper Mining in North America
From introduction: "In this paper are assembled and summarized many subjects relating to the copper industry in North America. Production of mines and districts, history of the industry in North America. Production of mines and districts, history of the industry, geology, of the principal deposits, and mining methods and costs are discussed."
Date:
1938
Creator:
Gardner, E. D.; Johnson, C. H. & Butler, B. S.
System:
The UNT Digital Library
Mineral Industries Survey of the United States: California, Calaveras County, Mother Lode District (South). Mines of the Southern Mother Lode Region. Part 1 -- Calaveras County
From Introduction: "The present paper discusses regional resources, chiefly of gold, the existence of which has long been demonstrated by substantial production but which are so nearly marginal in value that their mining has been protracted and will probably continue indefinitely for many decades."
Date:
1938
Creator:
Julihn, C. E. & Horton, F. W.
System:
The UNT Digital Library