Metallurgy and mineral processing plant at St. Joe's El Indio mine in Chile

Smith, E. H.
Organization: Society for Mining, Metallurgy & Exploration
Pages: 9
Publication Date: Jan 1, 1987
St. Joe Minerals Corp., a subsidiary of Fluor Corp., treats high-grade gold, silver, and copper ore at its El Indio plant at an altitude of 4 km in the Chilean Andes. The ore is complex, being a mixture of massive pyrite-enargite and quartz, both containing very fine gold and silver. Treatment produces a copper flotation concentrate containing high levels of gold, silver, and arsenic, and also dore bullion. Part of the flotation concentrate is roasted to remove the arsenic content, and arsenic trioxide is collected as a by-product.
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