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Location: 8 km SE from Rancagua, Chile
Colihues Km.13, Requínoa – Casilla 637RancaguaChile
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The historic Cauquenes and Colihues tailings impoundments are man-made deposits that were generated as sites for the containment of tailings produced during the processing of copper-molybdenum ore at the El Teniente mine. Feed to the plant is derived from two sources: fresh rougher tailings from the Codelco’s El Teniente concentrator and hydraulically recovered tails from the Cauquenes tailings impoundment. The mineralogy of the feeds varies, and the most recent mineralogy indicates that the main copper and molybdenum-bearing minerals are sulfide in nature. In the fresh tailings the majority of the copper (47%) occurs as chalcopyrite, with significant secondary copper sulfide forms: chalcocite, bornite, and covellite (40%). In the historic tailings, approximately 75% of the copper occurs as secondary copper minerals and about 17% of the copper occurs in the form of chalcopyrite. The portion of poor floating copper minerals (copper in iron oxides and sulfates) ranged from 7 to 13% for the historic and fresh tailings, respectively. In both tailings streams, the molybdenum occurs as molybdenite.
