Case studies on the use of geosynthetic clay liners in mining reclamation

Geosynthetic clay liners (GCLs) are manufactured barrier layers containing a high-quality sodium bentonite clay attached or adhered to geotextiles or a geomembrane. The GCL's low permeability and high strength make it an ideal replacement for low permeability soil or clay liners for mining reclamation projects. This paper will detail a select number of case studies where the GCL has been utilized in mining reclamation projects in the United States. These case studies range from a simple GCL-bentonite slurry wall tie-in to a to a large 74 hectare Superfund reclamation cap. The case studies will summarize, where appropriate, project-specific design, regulatory, installation, schedule, and economic issues involved with each project.