Oliver Filter at Anaconda Copper Mine September 1942
The Oliver filter operates at the Anaconda Copper Mining Company smelter in Anaconda, Montana, in September 1942. This machine filtered flotation concentrates from liquid, yielding concentrates with about 26% copper for further processing. This image provides insight into mid-20th century mining practices and copper production during World War II.
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Oliver Filter at Anaconda Copper Mine September 1942
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