Geology and Mining

The United States Geological Survey has all kinds of wonderful resources, including:

Historical Topo Maps which may be downloaded (free!)

The goal of The National Map’s Historical Topographic Map Collection (HTMC), which started in 2011, is to provide a digital repository of USGS 1:250,000 scale and larger maps printed between 1884, the inception of the topographic mapping program, and 2006.

Here’s a report from 1979 on the mineral resources of Aravaipa Canyon:
USGS Report on Mineral Resources of Aravaipa Canyon 1979

The Arizona Geological Survey also has a lot of interesting information. Here are some examples:

History of the San Manuel-Kalamazoo Mine, Pinal County, Arizona

Gems and Precious Stones of Arizona 1917

Geology and Geomorphology of the San Pedro River 2015


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