Arizona’s mining industry sparks resurgence of precious metals exploration
The southwestern U.S. state of Arizona, best known for the Grand Canyon – the mile-deep chasm carved by the Colorado River – is the 48th state and last of the contiguous states to be admitted to the Union, achieving statehood on February 14, 1912. The state has a long association with mineral exploration and mining. Early Native Americans mined surface outcrops of salt, clays, hematite, quartz, obsidian, stone, turquoise, and coal. In the late 1600s Spanish explorers searched...
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