11 Years of Evapotranspiration Cover Performance at the AA Leach Pad at Barrick Goldstrike Mines

Zhan, Guosheng; Keller, Jason M.; Milczarek, Mike; Giraudo, Joe

doi:10.1007/s10230-014-0268-6

Cited by 12 publications

(8 citation statements)

References 6 publications

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“…Under typical landfill gas pressures, compacted clay layer with thickness of 0.4 m or above is able to prevent gas breakthrough when clay degree of saturation is larger than 60%, as illustrated in Figure 6. This finding suggests that in humid regions where soil degree of saturation is generally larger than 60% [6], a 0.4 m-thick clay layer is sufficient to satisfy design requirements at ultimate limit state. Figure 4 shows results of gas breakthrough tests at two clay thicknesses (H = 0.4 and 0.6 m).…”

Section: Resultsmentioning

confidence: 65%

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Experimental study of gas breakthrough and emission in an unsaturated clay landfill cover

Coo

2016

E3S Web Conf.

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Abstract. Decomposition of municipal solid waste (MSW) generates a large amount of landfill gases (LFG) which can pose a high risk to the health of nearby residents and significantly promote global warming when they are released to the atmosphere. A commonly used method to control LFG emission is to place an engineering cover with a gas collection system over MSW. LFG pressure increases in landfill covers when the efficiency of gas collection systems is low, resulting in large gas emissions from cover surface. Compacted clay has been commonly used in landfill cover systems as a hydraulic barrier. However, the effectiveness of compacted clay as a gas barrier, especially resisting gas breakthrough and reducing emission rate under controlled conditions is not fully understood. In this paper, gas breakthrough pressure and emission rate were determined through a one-dimensional (1D) column over a wide range of landfill gas pressures under various degrees of saturation, thicknesses and degrees of compaction. Experiment results show that under a gas pressure of 10 kPa, a minimum of 0.4 m thick clay layer is able to prevent gas breakthrough at degree of saturation of about 60% (in humid regions). The reduction of gas emission rate by increasing degree of compaction is most prominent in the range of intermediate degree of saturation.

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Section: Resultsmentioning

confidence: 65%

“…Compacted clay, due to its relatively low saturated water permeability, has been widely used for landfill final cover systems [4,5]. In reality, however, landfill covers are unsaturated in service [6]. Infiltrated rainfall water can only increase their degrees of saturation but it is extremely not likely to saturate them.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of gas breakthrough and emission in an unsaturated clay landfill cover

Coo

2016

E3S Web Conf.

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“…6. This finding suggests that in humid regions where soil degree of saturation is generally higher than 60% (Weeks and Wilson, 2005;Zhan et al, 2014), a 0.4 m-thick clay layer is sufficient to satisfy design requirements at ultimate limit state. Fig.…”

Section: Gas Breakthrough Pressure At Different Degrees Of Saturationmentioning

confidence: 83%

“…Although saturated permeability is a key parameter for assessing the feasibility of compacted clays used as hydraulic barriers in landfill final covers, it is not sufficient to evaluate the performance of compacted clay barriers as gas barriers in terms of gas breakthrough pressure and emission rate at different weather conditions. This is because landfill covers are unsaturated in service (Weeks and Wilson, 2005;Zhan et al, 2014). Infiltrated rainfall water can increase the degrees of saturation of soil but improbable to render it fully saturated.…”

Section: Introductionmentioning

confidence: 96%

Gas breakthrough and emission through unsaturated compacted clay in landfill final cover

Chen

Coo

et al. 2015

Waste Management

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“…Such Store-DivertRelease (SDR) covers also take advantage of the unsaturated materials properties to accumulate water in a retention layer, and then force it to flow along the slope until discharge and evaporation reduces the water content. A SDR cover has been constructed on the slope of a heap leach pad at the Barrick Goldstrike operation (Zhan et al 2001(Zhan et al , 2014. The main design criterion in this case is the diversion length (LD), which is illustrated on Fig.…”

Section: Water Retention Coversmentioning

confidence: 99%

Review of the Reclamation Techniques for Acid-Generating Mine Wastes upon Closure of Disposal Sites

et al. 2016

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Acid mine drainage (AMD) remains a major environmental challenge for the mining industry. The preferred options for effectively limiting the environmental impact of AMD consist in controlling the reactions through the use of preventative techniques. Their principal objective is to exclude at least one of the constitutive elements of the chemical reactions, i.e. water, oxygen, or sulfidic minerals. The article recalls the basic principles and reviews different approaches for the prevention and control of AMD upon mine closure. The main methods include multi-layer covers, water covers, and an elevated water table (with a mono-layer cover). Their main advantages, limitations and uncertainties are addressed. Alternative approaches, such as environmental desulphurization and co-disposal of waste rock and tailings, are also discussed.

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11 Years of Evapotranspiration Cover Performance at the AA Leach Pad at Barrick Goldstrike Mines

Cited by 12 publications

References 6 publications

Experimental study of gas breakthrough and emission in an unsaturated clay landfill cover

Experimental study of gas breakthrough and emission in an unsaturated clay landfill cover

Gas breakthrough and emission through unsaturated compacted clay in landfill final cover

Review of the Reclamation Techniques for Acid-Generating Mine Wastes upon Closure of Disposal Sites

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