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Exploratory drilling in the 1960s and 1970s by the Arkla Exploration Co. and the Duval Corp. led to a 2008 Arizona Geological Survey report that revealed a 600-square-mile, 2.27 billion-ton potash ...
Copperstone Mine. 2011-01-0996, ADMMR mining collection, Arizona Geological Survey. Gold Deposits near Quartzsite, Ariz. Contributions to Economic Geology. 1915, Part 1. Love, Frank.
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