Design & operational experience of the Cerro Lindo filtered tailings deposit.
José Luis Lara (Golder) and Aldo León (Compañía Minera Milpo S.A.A)
Paste 2011 - 14th International Seminar on Paste and Thickened Tailings
Apr 10, 2011
Filtered tailings (FT) provides an alternative to surface tailings deposition that is being applied more frequently in areas in which availability of space and water is limited. FT can be applied in areas in which topographic, geotechnical and geodynamic conditions as well as seismic, climatic and rheological conditions of the tailings allow their implementation. Cerro Lindo Project (CLP) is located 200 km south of Lima-Peru in an area of limited rainfall and high seismic activity. The tailings deposit is located in a quebrada (ravine) with a moderate to high gradient, of the order of 20-25%, in a small basin less than 1 km2 in area. The project started operation in 2007 and currently processes 7,000 tpd to obtain polymetallic minerals (lead, zinc and copper); CLP produces tailings that are deposited on the surface and in underground mining. For surface deposition of tailings, the tailings are filtered by belt filters until 85% solids content is reached. Then the tailings are transported by trucks to the deposition area where they are placed in different zones in a cyclical manner to allow drying until the proper moisture content is achieved to allow compaction in layers. The deposited tailings are high in pyrite, with high specific gravity and of sandy silt particle size.
This article shows design concepts and operational expertise gained over the past three years in the deposit management of filtered tailings of Cerro Lindo Mine. This is considered a unique and successful world class operation in the implementation of tailings dewatering, and in the application of friendly technologies with small impact on the environment and an operation that uses the water from the tailings dewatering process and also seawater for the operation of the mine.
Please see attached PDF.