At head of title: United States Department of the interior. Harold L. Ickes, secretary. Bureau of mines. John W. Finch, director.
Summarizes, consolidates and analyzes information on mining methods, practices and costs in a large number of metal mines in the United States and foreign countries published 1928-1938 by the U.S. Bureau of mines and in the technical press. cf. p. 1-2.
"Although the exploitation of deposits of metalliferous ores cannot be discussed comprehensively without considering milling and marketing of the ores, this bulletin is concerned principally with mining or ore production."--p.2.