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Anaconda smelter, Montana. Anaconda Copper Mining Company. Hardinge ballmill where the copper ore is ground to the consistency of flour. At the upper left is the classifier where the slimy material is separated from the granular material, the latter of which returned to the ballmill for further grin
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Credit lineAnaconda smelter, Montana. Anaconda Copper Mining Company. Hardinge ballmill where the copper ore is ground to the consistency of flour. At the upper left is the classifier where the slimy material is. 1942-01-01. Lee, Russell. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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