1. Arizona (Gila County), Miami copper belt Yale Public content 1912. 2020-03-05T17:53:31Z. 2020-03-05T17:53:31Z. Geological Survey (U.S.). Dept. of the Interior, U.S. Geological Survey. English. cartographic image. Public. Gila County (Ariz.), Arizona, Gila County, and Gila County.