Public domain
Anaconda smelter, Montana. Anaconda Copper Mining Company. Flotation machine in which particles of copper sulphide ore are attracted to the oily bubbles which retain the minerals by the process of adsorption; the ore floats and is skimmed off from the gangue, which remains submerged and it (the gang
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Credit lineAnaconda smelter, Montana. Anaconda Copper Mining Company. Flotation machine in which particles of copper sulphide ore are attracted to the oily bubbles which retain the minerals by the process of ads. 1942-01-01. Lee, Russell. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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