Public domain
Anaconda smelter, Montana. Anaconda Copper Mining Company. Top of one of the multiple-hearth roasting furnaces. The concentrates move by gravity from one hearth to another; in one hearth the material is moved from circumference to center and on the next hearth vice versa
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Credit lineAnaconda smelter, Montana. Anaconda Copper Mining Company. Top of one of the multiple-hearth roasting furnaces. The concentrates move by gravity from one hearth to another; in one hearth the material . 1942-01-01. Lee, Russell. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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