14 November 2014. An industrial accident at the Freeport-McMoRan copper smelter led to several large explosions at a Miami, Arizona, mine, investigating authorities said.

AZ CENTRAL

http://www.azcentral.com/story/news/12-news/2014/11/13/arizona-copper-mine-explosion

At industryabout.com: Miami Copper Smelter

Miami Copper Mine

 

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