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copper porphyry

Christmas Mine from AZ 77
Arizona's Christmas Mine 1880s to 1982
Arizona Mining Review
Minerals & Mining
News
 - 24 March 2021
A history of the Christmas Mine, Gila County, Arizona
Abandoned mining camp in Helvetia, Arizona (J. Rasmussen)
Review 'Helvetia-Rosemont: Arizona’s Hardscrabble Mining Camp'
Arizona Mining Review
Minerals & Mining
News
 - 25 July 2020
David Briggs tells a compelling story of the Helvetia-Rosemont Mining District in the Santa Rita Mountains of southern Arizona.
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