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Anaconda smelter, Montana. Anaconda Copper Mining Company. Automatic sampler at end of conveyor belt; by this device, which gathers and drops a sample into a hopper, precise information is obtained concerning the content of copper and other metals in the ore
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Credit lineAnaconda smelter, Montana. Anaconda Copper Mining Company. Automatic sampler at end of conveyor belt; by this device, which gathers and drops a sample into a hopper, precise information is obtained co. 1942-01-01. Lee, Russell. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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