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Phelps Dodge refining company, El Paso, Texas. Casting copper ingots
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El Paso, Texas. Phelps Dodge refining company. Sheets of pure copper are formed by electrolysis in large tanks in later melted and poured into ingots
El Paso. Texas, Phelps Dodge refining company. Electrolytic tanks holding sheets of pure copper that will later be melted and poured into ingots
El Paso. Texas, Phelps Dodge refining company. Electrolytic tanks holding sheets of pure copper that will later be melted and poured into ingots