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Anaconda smelter, Montana. Anaconda Copper Mining Company. Top of the multiple-hearth roasting furnaces; in these furnaces the ore is moved by gravity from one hearth to the one immediately below it; the flow of ore is such that it goes from the outside of the cylindrical furnaces to the inside on o
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Credit lineAnaconda smelter, Montana. Anaconda Copper Mining Company. Top of the multiple-hearth roasting furnaces; in these furnaces the ore is moved by gravity from one hearth to the one immediately below it; . 1942-01-01. Lee, Russell. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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