Public domain
Anaconda smelter, Montana. Anaconda Copper Mining Company. Battery of Hardinge ballmills; in these ballmills the ore is ground to the consistency of flour which is a requisite condition for the floatation process of concentration
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Credit lineAnaconda smelter, Montana. Anaconda Copper Mining Company. Battery of Hardinge ballmills; in these ballmills the ore is ground to the consistency of flour which is a requisite condition for the floata. 1942-01-01. Lee, Russell. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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