Public domain
Production. Copper. One of the gas-heater roasters at the Arthur mill of the Utah Copper Company where molybdenum concentrates are treated. Molybdenum is recovered as a by-product of the copper ore
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Credit lineProduction. Copper. One of the gas-heater roasters at the Arthur mill of the Utah Copper Company where molybdenum concentrates are treated. Molybdenum is recovered as a by-product of the copper ore. 1940-01-01. Feininger, Andreas, United States. Office Of War Information. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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