Title: Copper deposits of part of Helvetia mining district, Pima County, Arizona
First published: 1955
Subjects: Copper mines and mining, Copper ores, Economic Geology, Geology, Geology, Economic, Igneous Rocks, Mines and mineral resources, Ore deposits, Rocks, Igneous, Rocks, Sedimentary, Sedimentary Rocks
Places: Arizona, Pima County