Development of drain hole design optimisation: a conceptual model for open pit mine slope drainage system with fractured media using a multi-stage genetic algorithm

Widodo, Lilik Eko; Cahyadi, Tedy Agung; Syihab, Zuher; Notosiswoyo, Sudarto; Iskandar, Irwan; Rustamaji, Heru Cahya

doi:10.1007/s12665-018-7895-3

Cited by 6 publications

(4 citation statements)

References 22 publications

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“…In the absence of detailed information about the water table level, hypothetical groundwater scenarios that take into account different depths of groundwater can be useful for stability assessments (Solak et al 2017). Despite hypothetical scenarios do not represent the reality of hydrogeological conditions, slope stability analysis considering groundwater drawdown by horizontal drains showed signi cant improvements in FoS (Saeed et al 2015;Widodo et al 2018). Powerful groundwater simulation and optimization models have been used in many different elds (Gorelick and Zheng 2015), but far less attention has been paid to the investigation of groundwater drawdown scenarios in mining studies (Jiang et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Slope geometry optimization considering groundwater drawdown scenarios at an open-pit phosphate mine, southeastern Brazil

Borges

Bacellar

Grasso³

et al. 2023

Environ Earth Sci

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The design of open-pit mines should balance safety and economy. However, safe geotechnical conditions generally involve redesigning the geometry of slopes and groundwater drawdown, signi cantly increasing the costs of mining operations. The use of numerical models to simulate groundwater drawdown and slope stability can be an alternative to assess cost-bene t trade-offs for decision-making. This study documents a mining plan using groundwater drawdown scenarios that illustrate how geotechnical, economic, and environmental indicators can be combined to obtain optimum slope geometry for open-pit mining. The optimization approach analyzed different scenarios of groundwater drawdown for the nal pit of a phosphate mine to improve the pit slopes stability. The groundwater simulation scenarios included the combination of deep horizontal drains and pumping wells. Stability analyzes using the limit equilibrium method were used to obtain the bench, inter-ramp, and overall factors of safety of different representative sections. The factors of safety obtained, the drawdown costs and the water table elevation of each section were selected as indicators for obtaining the optimal drawdown scenario using a multi-objective tool. The groundwater control system obtained with 11 horizontal drains and 1 pumping well was considered the most adequate from the geotechnical and economic perspectives. Slope geometry optimization obtained with this drawdown scenario led to adequate inter-ramp and overall safety factors for the nal pit design, reducing the barren-to-ore ratio to 0.38, much less than the present ratio (≈ 3). The results are important for optimizing the slope geometry of open-pit mines and can be replicated in other regions.

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Section: Introductionmentioning

confidence: 99%

Slope geometry optimization considering groundwater drawdown scenarios at an open-pit phosphate mine, southeastern Brazil

Borges

Bacellar

Grasso³

et al. 2023

Environ Earth Sci

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“…Visual Mod ow software has the ability to simulate more complex conditions, can provide more realistic results, and is widely used to simulate groundwater ow, evaluate groundwater resources, and predict the spread of contaminants with MT3DMS packages (Adhikari & Mal, 2021;Ma et al, 2012;Rahman et al, 2018). Along with the development of technology, Visual Mod ow can also be combined with a genetic algorithm (GA) in solving groundwater problems (Widodo et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Water quality analysis results at nickel mines in New Caledonia show high concentrations of Cr 6+ and are strongly affected by rainfall (Gunkel-Grillon et al, 2014). A study conducted by (Tiwary et al, 2018) can also be combined with a genetic algorithm (GA) in solving groundwater problems (Widodo et al, 2018). Identifying the concentration of groundwater contaminant sources is essential for managing and protecting groundwater from anthropogenic pressures (Soltani et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Simulation of Contaminants Transport in Groundwater From Nickel Mining Waste Dump Southeast Sulawesi

Setiawan

Cahyadi

Amri

et al. 2022

Preprint

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The irregularities of nickel resource mining in Indonesia cause many serious environmental problems. Piles of leftover rocks on nickel mining waste dumps have the potential to be a source of heavy metal seepage into the water. This study was conducted to assess the impact of nickel mining in the Langgikima Subdistrict of the North Konawe Regency of Southeast Sulawesi Province. The focus is to assess the migration of hexavalent chromium (Cr6+) and iron (Fe) using MT3DMS to model the transport of solutes. The study's goal was to identify cr6+ and Fe concentrations in waste dumps and predict the spread of contaminants over a 20-year period of time. XRF (X-Ray Fluorescence) is done to determine the content of elements and minerals in rocks. Toxicity Characteristics Leaching Procedure (TCLP) is performed to estimate the concentration of Cr6+ and Fe in waste dumps. AAS (Atomic Absorption Spectrophotometer) to find out the content of Cr6+ and Fe in surface water and land water samples. The results showed the highest concentrations of Cr6+ of 0.0462 mg/L and Feat 0.8709 mg/L. Simulations without compacted clay coatings, Cr6+ and Fe contaminants could be transported consecutively by 2.7 km and 2.42 km while simulations used compacted clay layers with a hydraulic conductivity of 1 × 10−9 m/s of Cr6+ and Fe contaminants could be transported consecutively by 0.412 km and 0.467 km. It can therefore be concluded that heavy metals in the remaining rock piles from the waste dump can be transported into groundwater, and the action of using a compacted layer of clay must be taken to prevent contaminant migration into groundwater.

show abstract

Section: Introductionmentioning

confidence: 99%

Slope geometry optimization considering groundwater drawdown scenarios at an open-pit phosphate mine, southeastern Brazil

Borges

Bacellar

Grasso

et al. 2022

Preprint

View full text Add to dashboard Cite

The design of open-pit mines should balance safety and economy. However, safe geotechnical conditions generally involve redesigning the geometry of slopes and groundwater drawdown, significantly increasing the costs of mining operations. The use of numerical models to simulate groundwater drawdown and slope stability can be an alternative to assess cost-benefit trade-offs for decision-making. This study documents a mining plan using groundwater drawdown scenarios that illustrate how geotechnical, economic, and environmental indicators can be combined to obtain optimum slope geometry for open-pit mining. The optimization approach analyzed different scenarios of groundwater drawdown for the final pit of a phosphate mine to improve the pit slopes stability. The groundwater simulation scenarios included the combination of deep horizontal drains and pumping wells. Stability analyzes using the limit equilibrium method were used to obtain the bench, inter-ramp, and overall factors of safety of different representative sections. The factors of safety obtained, the drawdown costs and the water table elevation of each section were selected as indicators for obtaining the optimal drawdown scenario using a multi-objective tool. The groundwater control system obtained with 11 horizontal drains and 1 pumping well was considered the most adequate from the geotechnical and economic perspectives. Slope geometry optimization obtained with this drawdown scenario led to adequate inter-ramp and overall safety factors for the final pit design, reducing the barren-to-ore ratio to 0.38, much less than the present ratio (≈ 3). The results are important for optimizing the slope geometry of open-pit mines and can be replicated in other regions.

show abstract

Development of drain hole design optimisation: a conceptual model for open pit mine slope drainage system with fractured media using a multi-stage genetic algorithm

Cited by 6 publications

References 22 publications

Slope geometry optimization considering groundwater drawdown scenarios at an open-pit phosphate mine, southeastern Brazil

Slope geometry optimization considering groundwater drawdown scenarios at an open-pit phosphate mine, southeastern Brazil

Simulation of Contaminants Transport in Groundwater From Nickel Mining Waste Dump Southeast Sulawesi

Slope geometry optimization considering groundwater drawdown scenarios at an open-pit phosphate mine, southeastern Brazil

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