Copper mine tour at the ASARCO Mission Mine and Mineral Discovery Center in Pima county Arizona.The mission mine is an open pit copper mine 18 miles south of Tucson Az. That produces both copper and silver. It is 2.5 by 1.5 miles long and 1,200 feet deep. The discovery Center is a both an indoor and outdoor mining museum that also offers tours of the mine and the copper mill. The mill grinds the copper ore into a powder and then the copper is separated from the ore by a froth flotation process. The large spinning drums in the mill are ball mills. The ore feeds into the drums and is spun with 3 inch steel balls that are lifted by the rotating walls and then dropped onto the ore.
Video taken with an iPhone 4s and GoPro Hero 3+
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