Public domain
Oliver filter at the Anaconda Copper Mining Company smelter. In this machine flotation concentrates are filtered from the liquid; from this operation the concentrates, which contain about twenty-six percent copper, go directly to the roasting furnace
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Credit lineOliver filter at the Anaconda Copper Mining Company smelter. In this machine flotation concentrates are filtered from the liquid; from this operation the concentrates, which contain about twenty-six p. 1942-01-01. Lee, Russell. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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