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Copper Mining Plant at Morenci, Ariz. The most modern smelter, reduction plants and processing equipment are seen against the background of the huge open pit from which trains haul the ore. [Caption by Josef Muench]

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Copper Mining Plant at Morenci, Ariz. The most modern smelter, reduction plants and processing equipment are seen against the background of the huge open pit from which trains haul the ore. [Caption by Josef Muench]