GeoSnaps - Image of the Day
Geologic snapshots capturing Arizona’s geologic setting and mining history with a picture of the day from 1 January through 31 December 2013.
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Tuesday, March 12, 2013Manganese oxides were mined and stockpiled during the 1950s. This stockpile still remains at the mine site. Manganese, a strategic and critical mineral used to produce steel, was purchased by the federal government during the Korean War because of concerns about disruptions to manganese imports. Photo by Jon Spencer.