![Queen Mine](thumbs/folder/queenmine_18.jpg)
Queen Mine
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![P1050771 Nearly a century of production in Bisbee yielded some 4 million tons of copper. The worldwide consumption is now about 17 million tons of copper per year, the...](thumbs/P1050771.webp)
Nearly a century of production in Bisbee yielded some 4 million tons of copper. The worldwide consumption is now about 17 million tons of copper per year, the…
![P1050783 Large, circular concrete structures are all that remain ofa concentrate thickener, which used a chemical flotation process to separate metal from rock in finely...](thumbs/P1050783.webp)
Large, circular concrete structures are all that remain ofa concentrate thickener, which used a chemical flotation process to separate metal from rock in finely…
More than 300 types…