Copper smelting commenced at San Luis Potosi in 1890. The plant was purchased by Asarco in 1923 and subsequently the present smelter was constructed. In 1965, Mexican interests acquired 51% of the plant and this was increased to 66% in 1974 when IMMSA was formed, and subsequently to 68.8%. In 1978 the plant was expanded to the current capacity. The smelter treats 'dirty' concentrates and ores from polymetallic mines, mattes and speiss from lead smelters and concentrates from small local...
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