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Production. Copper. A closeup of a disc-type filter showing how the dried copper concentrate is broken by expansion of the filter and then discharged. This filter unit is at the Arthur plant of the Utah Copper Company. Sourced from the Library of Congress.
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Production. Copper. A closeup of a disc-type filter showing how the dried copper concentrate is broken by expansion of the filter and then discharged. This filter unit is at the Arthur plant of the Utah Copper Company. Sourced from the Library of Congress.

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Production. Copper. A closeup of a disc-type filter showing how the dried copper concentrate is broken by expansion of the filter and then discharged. This filter unit is at the Arthur plant of the Utah Copper Company. Sourced from the Library of Congress.

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