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Suitable for variable ore types and leach cycle times. Typically large area for leach pad. Pad area based on ore production, leaching cycle time, ore “aging”, etc. Flat topography to maintain geotechnical stability.
exceed 500 feet (150 meters) above the geomembrane lined pad foundation. A geomembrane lined leach pad with a stacked and leached ore heap in the background is shown on Photo 2. Each ore lift surface is wetted uniformly during leaching by using irrigation drip emitters or sprinkler sprays.
Flat or Expanding Leach Pad. The ideal leach pad is located within a sufficiently large area . with a 2%–3% downslope and 1% across slope, clayey in situ material below the topsoil, nearby sources of clay or low- permeability soil for the pad base, and gravel for the protec-tive/drainage layer. This allows construction of a regular-shaped ...
13 de jun. de 2016 · The leach pad supports the ore heaps, collects solution flowing through the heaps, transports the solution laterally to drainage pipes or ditches, and prevents toxic or hazardous chemicals from penetrating into the ground.
13 de ago. de 2021 · the most recent heap leach pad designs in the Chilean mining sector, and provides a comparison with the “old fashioned” design. This paper discusses several issues such as location, earthworks, overliner materials, liner system, leak prevention and monitoring systems, leach collection and recovery systems, and pond covers, among other issues.
presenting an up to date overview of modern day heap leaching in mining; providing the relevant information to consider heap leaching in the context of Best Available Techniques (BAT) as defined by the relevant regulatory instruments of the European Union.
Leach pads as large as 2 km2 and piles as high as 140 m are becoming common, and substantially larger projects are in operation – Escondida Sulfide pad in Chile is almost 10 km2. Along with such advances, the geotechnical implications and the risks of failure have increased.
