Liner system design for heap leach pads

Lupo, J.

doi:10.1016/j.geotexmem.2009.10.006

Cited by 29 publications

(18 citation statements)

References 21 publications

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“…Heap leaching is the largest applications of geomembranes in mining application (Breitenbach and Smith 2006). In nearly all cases, the leach pad area is lined with natural and geosynthetic materials (Lupo 2010). Heap leach operations rely on the performance of geosynthetic products to provide efficient solution recovery and environmental containment (Christie and Smith 2013).…”

Section: Introductionmentioning

confidence: 99%

Antioxidant depletion in high-density polyethylene (HDPE) geomembrane with hindered amine light stabilizers (HALS) in low-pH heap leach environment

Rowe

Abdelaal

2016

Can. Geotech. J.

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Antioxidant depletion from a high density polyethylene geomembrane with hindered amine light stabilizers (HALS) immersed in seven different low pH solutions is examined over a 3-year period. The examined solutions had the range of pH (0.5, 1.25, and 2.0) likely to encompass the pH of the leach solutions found in copper, nickel, and uranium heap leach pads. The metal concentration for these solutions is adopted from copper raffinate solutions. Additional solutions are investigated to examine the effects of field practices such as using surfactants in the leach solutions and pre-curing of the ores used to improve the metallurgical response of the ore. For the antioxidants detected by standard oxidative induction time (Std-OIT), there was a depletion to residual value of about 20% of the initial Std-OIT that varied depending on the incubation temperature and pH of the solution whereas decreasing the pH from 2 to 0.5 did not significantly affect the depletion rates of Std-OIT. The antioxidants detected by high pressure oxidative induction time (HP-OIT) exhibited the fastest depletion in pH=1.25 with the highest residual values followed by pH 2.0 and the slowest HP-OIT depletion was in pH=0.5 but with the lowest residual values. Arrhenius modelling is used to predict the length antioxidant depletion stage for each solution based on both Std-OIT and HP-OIT.

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Section: Introductionmentioning

confidence: 99%

Antioxidant depletion in high-density polyethylene (HDPE) geomembrane with hindered amine light stabilizers (HALS) in low-pH heap leach environment

Rowe

Abdelaal

2016

Can. Geotech. J.

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“…The most preferred pad liner system in current heap leach practice is the composite liner with an overlying drain cover fill Testing has indicated that both, high-density polyethylene (HDPE) and linear low-density polyethylene (LLDPE) geo-membranes, are suitable for containment of acidic solutions and metal leaching products, for periods of over 50 years (Lupo, 2010;Breitenbach and Smith, 2007;Renken et al, 2005). The geo-membrane lined heap leach pads for the 21st century have an estimated operating life times of 10 years or more, compared to the more typical periods of 3 to 5 years reported in the past for gold and silver heap leach operations.…”

Section: Heap Designmentioning

confidence: 99%

“…The geo-membrane lined heap leach pads for the 21st century have an estimated operating life times of 10 years or more, compared to the more typical periods of 3 to 5 years reported in the past for gold and silver heap leach operations. It is worthwhile to note (Lupo, 2010;Thiel and Smith, 2004;van Zyl and Bronson, 1994) have classified leach pads into different categories (Table 4).…”

Section: Heap Designmentioning

confidence: 99%

“…An improved method for heap leaching of chalcopyrite Miller and Winby, 1999 Table 4: Typical classification of heap pads with characteristics and schematices (Schnell, 2013;Lupo, 2010;Thiel and Smith, 2004;van Zyl and Bronson, 1994). A c c e p t e d M a n u s c r i p t 182 Table 5: Characteristics of sprinklers or drip irrigation systems (Guzman, 2008;Burgmayer, 2002;Wan and Brierley, 1997;Wan, 1997).…”

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confidence: 99%

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Heap leaching technology – current state, innovations and future directions: A review

Ghorbani

Franzidis

Petersen

2015

Mineral Processing and Extractive Metallurgy Review

104

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Heap leaching is a well-established extractive metallurgical technology enabling the economical processing of various kinds of low-grade ores, which could not otherwise be exploited. However, despite much progress since it was first applied in recent times, the process remains limited by low recoveries and long extraction times. It is becoming increasingly clear that the choice of heap leaching as a suitable technology to process a particular mineral resource, which is both environmentally sound and economically viable, very much depends on having a comprehensive understanding of the underlying fundamental mechanisms of the processes and how they interact with the particular mineralogy of the ore body under consideration. This paper provides an introduction to the theoretical background of various heap leach processes, offers a scientific and

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“…Amini (2005), proposed a new approach for the stability assessment of these structures using the ''step by step'' method. Lupo and Morrison (2007) and Lupo (2010), carried out some research on the stability of such structures with special view on geo-membrane properties (Lupo and Morrison 2007;Lupo 2010). Based on their experiences, they presented general guidelines for the design of leaching heaps.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Slide Mechanism of Heap Leaching Structures Based on Physical Modeling

2015

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In this research, first, a brief review of heap leaching structures is presented. Then, some engineering properties of natural and geo-synthetic materials of a leaching heap bed are introduced. Next, physical models of these structures are tested using a tilting table, and the apparatus's ''scale factor'' for the evaluation of the probable slides in these structures is determined. Analyses have shown that the ''scale factor'' of the ''factor of safety'' for the above physical models against slide approximately equals 1; therefore, the slide mechanism in such structures can be studied using tilting table experimental models. On this basis, 12 physical models of leaching heaps were made and their stability checked with the apparatus. Next, using Morgenstern and Price method, the stability of the above models was evaluated and the analytical and physical results were compared for the verification of the limit equilibrium approaches. Comparisons have shown that the error of such methods in the stability analyses of leaching heaps is \8 %. As a real case study, the Shahr-e-Babak heap leaching structure failure and its stabilization methods have been presented. In this project, tensile cracks occurred in the upper section of the heap after loading the second ore lift, and a part of it slid. The heap was stabilized using a double textured geo-membrane liner and safety berms.

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Liner system design for heap leach pads

Cited by 29 publications

References 21 publications

Antioxidant depletion in high-density polyethylene (HDPE) geomembrane with hindered amine light stabilizers (HALS) in low-pH heap leach environment

Antioxidant depletion in high-density polyethylene (HDPE) geomembrane with hindered amine light stabilizers (HALS) in low-pH heap leach environment

Heap leaching technology – current state, innovations and future directions: A review

Investigating the Slide Mechanism of Heap Leaching Structures Based on Physical Modeling

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