Arizona mining photos and reports posted in MSHA Digital Library

The Mining Safety & Health Administration (MSHA) has a large repository of publications, reports, and photos in their online Digital Library from across the country including 418 from US Bureau of Mines that cover some aspects in Arizona.  I found a few dozen historical photos labelled Arizona (but a few were from California).

[Right, Copper Queen Mine, loading mine cages, Bisbee, Arizona.  Courtesy, Phelps Dodge Corporation]