https://en.m.wikipedia.org/wiki/Peterson_Space_Force_Base

Peterson Space Force Base, previously Peterson Air Force Base, Peterson Field, and Army Air Base, Colorado Springs, is a United States Space Force base that shares an airfield with the adjacent Colorado Springs Municipal Airport and is home to the North American Aerospace Defense Command(NORAD), the Space Force's 21st Space Wing, elements of the Space Force's Space Systems Command, and United States Northern Command(USNORTHCOM) headquarters. Developed as a World War II air support base for Camp Carson, the facility conducted Army Air Forces training and supported Cold War air defense centers at the nearby Ent Air Force Base, Chidlaw Building, and Cheyenne Mountain Complex. The base was the location of the Air Force Space Commandheadquarters from 1987 to 20 December 2019 and has had NORAD/NORTHCOM command center operations since the 2006 Cheyenne Mountain Realignment placed the nearby Cheyenne Mountain Complex on standby. On 26 July 2021, the installation was renamed Peterson Space Force Base to reflect its prominent role in the new space service.

This photo depicts a narrow gauge railroad pulling slag cars from a copper smelter in the Morenci district.

Jerome Arizona was a very remote, and very rich copper town perched on the side of a steep mountain. The town peaked in the 1920s with a population of over 10,000, with several thousand men employed at the local mines.

Contention Mill in Contention, Arizona 1880
Charleston was another milling town for Tombstone silver ore. The mills there were captured in detail by frontier photographer Carleton E. Watkins in 1880.

Tombstone Companies’ M & M 10-Stamp Mill at Charleston, Arizona
Two mills, a 10 stamp and a 20 stamp, operated at Charleston. These mills operated until the late 1880s.

Cornish pump at a Tombstone mine ca. 1890
Bisbee Arizona is another historic copper camp that helped Arizona become the leader in US copper production. The following photo shows miners standing on square set timbers and cribbing that is supporting the ceiling of a massive stope.

Quite a massive !!! Seems like it’s been there for a while???