113 ADVANCES IN THE APPLICATION OF GEOSYNTHETICS IN FINAL CLOSURE COVERS IN PERU, BRAZIL AND CHILE. *R. Lagos1 1Tecnologia de Materiales S.A, Peru, (rlagos@tdm.com.pe) ABSTRACT Final closure involves a series of activities such as demolition, dismantling, physical, chemical, and hydrological stabilization, revegetation, rehabilitation of aquatic habitats and borrow areas, among others. To achieve these goals, it is necessary to consider closure cover for mining components such as waste rock dumps, leaching pads, pits, and others, which have required compliance with and assurance of chemical, hydrological, and physical stability for a final closure stage. Geosynthetics have been used in Peru for more than 25 years, but in the last 8 years they have become more relevant as an alternative solution to selected soils such as low permeability soil and drainage material, which make up a traditional closure, due to the scarcity of quarries and the availability of large volumes of soil necessary for the formation of traditional cover. The objective of this work is to report on advances in the application of geosynthetics in closure covers, such as geomembranes, geotextiles, geocells, geogrids, and drainage geocomposites in closure covers, both on steep slopes, horizontal areas, and channel linings in projects already executed in Peru, Chile, and Brazil. In conclusion, the following paper will present a compilation of experiences in the use of geosynthetics in covers for mining components and mining environmental liabilities (PAM) that have made it possible to meet the requirements for final closure stability, cost reduction, and project execution deadlines, as well as the lessons learned from the construction process with geosynthetics. KEYWORDS Closure, geosynthetics, stability, mining. 1. CASE HISTORY Nº1- CLOSING OF WASTE ROCK DUMP EXCELSIOR, CERRO DE PASCO, PERU. 1.1 Background The Excelsior Closure Plan is the largest environmental liability in the history of Peru, located in Cerro de Pasco, with 69 hectares and 55 million tons of mining waste accumulated from 1956 to 2000. Figure 1 shows the initial stage of the closure of the Excelsior mine.
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