Public domain
Untitled photo, possibly related to: Anaconda smelter, Montana. Anaconda Copper Mining Company. Copper converter in action. Object of converting is to eliminate sulphur and iron; this is accomplished by blowing compressed air through the molten charge. The oxidation products unite with silica which
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineUntitled photo, possibly related to: Anaconda smelter, Montana. Anaconda Copper Mining Company. Copper converter in action. Object of converting is to eliminate sulphur and iron; this is accomplished . 1942-01-01. Lee, Russell. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.