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A haze can be seen at night hovering over the Asarco copper smelter, which turns copper ore into nearly pure copper bars.
Emma Schwartz/Center for Public Integrity
November 17, 2011 The unpublicized "finding of violation" issued against the Asarco copper smelter in Hayden, Ariz., claims the company has been emitting illegal amounts of lead, arsenic and eight other dangerous compounds for six years. Asarco disputes that.
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