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Abstract

Copper deposits of the Rosemont-Helvetia mining district lie in the northern Santa Rita Mountains approximately 35–40 miles south-southeast of Tucson, Arizona (Fig. 1). Within the district, four separate areas of copper mineralization occur -Rosemont, Peach-Elgin, Broad Top Butte, and Copper World (Fig. 2); however, only the Rosemont and Peach-Elgin deposits have drill-defined reserves. These various mineral reserves were purchased by ASARCO, Inc. in 1988.

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