Solving challenging design conditions with engineered Geosynthetic Clay Liners
Geosynthetic Clay Liners (GCL) are used in the construction of various mining facilities, including process solution ponds, heap leach pads, tailings storage facilities, stormwater containment, wastewater treatment ponds and closures. The service conditions in these mining applications are among the most demanding. Harsh environmental conditions provide a challenge to engineers designing the projects. In weather-sensitive, remote or high-altitude locations, GCLs allow more efficient installation than compacted clay liners. GCLs are an important component of mining liner systems because of the benefits they provide in cost effective construction, environmental compliance and cost saving reduction in process solution leakage.
BENTOMAT® DN is a reinforced GCL consisting of a layer of sodium bentonite between two nonwoven geotextiles, which are needlepunched together.
BENTOMAT® ST is a reinforced GCL consisting of a layer of sodium bentonite between a woven and a nonwoven geotextile, which are needlepunched together.
BENTOMAT® 200R is a non-reinforced needle-punched GCL consisting of a layer of sodium bentonite between woven and nonwoven geotextiles, which are needlepunched together.
BENTOMAT® CLT is a Composite Laminate reinforced GCL consisting of a layer of sodium bentonite between two geotextiles, which are needlepunched together and laminated to a textured geomembrane.
BENTOMAT® CL is a Composite Laminate reinforced GCL consisting of a layer of sodium bentonite between two geotextiles, which are needlepunched together and laminated to a smooth flexible membrane.
West Finley, Pennsylvania
Bailey Mine, supplies bituminous coal used in the generation of electricity. At the site, coal laden sediment is pumped to settlement ponds which are typically underlain with clay. As the ponds are extended vertically to increase theircapacity, the side slopes must be lined with clay or geosynthetic clay liner (GCL) to prevent the pumped water from reentering the local aquifer.
BARRICK GOLDSTRIKE MINE
The Barrick Goldstrike tailings bottom liner system consisted of an 80 mil HDPE textured geomembrane overlaying BENTOMAT DN GCL. The GCL was used as a replacement for the 1 ft of 1 x 10-6 cm/sec permability compacted clay liner.
Carlotta, Arizona, U.S.A.
The Carlota Copper mine is an open-pit copper mine located approximately six miles west of Miami, Arizona. The site produces LME grade copper cathode through the process of heap leaching, in which a chemical solution is ir-rigated through heaps of ore, dissolving the precious metal. The resulting copper-infused liquid (aka the pregnant leach solution) trickles down to a leach pad, where it is collected and pumped to a recovery facility. In order to prevent the pregnant leach solution from leaking out, the leach pads are typically comprised of a composite liner system with a geomembrane overlying a low permeability soil layer.
Erzincan Province, Turkey
The Gold Mine Heap Leach project is a large, open pit gold deposit located in central Turkey. The site processes gold ore through leaching, in which a chemical solution is irrigated through heaps of ore, dissolving the precious metal. The resulting gold-infused liquid trickles down to a leach pad, where it is collected and pumped to a recovery facility.
FORT MCMURRAY OIL SANDS
Northeastern Alberta, Canada
The Suncor Pond 1 is an oil sands tailings pond located near Fort McMurray, Alberta, Canada. This region experiences an average winter temperature of -19 °C, with a record low temperature of -50 °C. Full-scale closure and reclamation activities had been underway at the site since 2007. In late 2009, infilling of the pond had been completed.
RASMUSSEN RIDGE PHOSPHATE MINE
Soda Springs, Idaho
The Rasmussen Ridge Phosphate Mine Tailing Storage Facility was implemented as part of the on-going Supplemental Reclamation Action as a demonstration project. The cap and cover system was designed to effectively eliminate surface water infiltration and potential runoff of trace concentrations of selenium contained in the waste rock.