Risk assessment methodology for shut-down and abandoned mine sites in Namibia

Hasheela, Israel; Schneider, Gabi; Ellmies, Rainer; Haidula, A.; Leonard, R.J.; Ndalulilwa, K.; Shigwana, O.; Walmsley, Bryony

doi:10.1016/j.gexplo.2014.05.009

Cited by 10 publications

(7 citation statements)

References 2 publications

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“…However, the pH change curve of the FGK3 solution decreased from 9.87 to 8.34 after a continuous decrease, and finally remained stable in a similar process to other solutions. This confirmed the different impact mechanisms of the site karst water, and the results also showed the buffering capability of coal gangue against acid and alkali [22,28]. There were significant differences in pH variations over time for FGU and FGLU, and although the pH change trends are roughly the same trends, they tended to have greater values for FGU solution than that of FGLU solution and took longer to recover the balance.…”

Section: Analysis Of Basic Water Quality Parameters For Different Imm...mentioning

confidence: 54%

“…Moreover, the initial concentration and the release law of different chemical components in water over time are analyzed by changing the experiment parameters (such as pH, immersion temperature, solid-liquid ratio, immersion time, etc.). At present, many scholars have conducted much work on water pollution caused by wastewater discharged from the mining area [20,21], but there is less research on the water pollution caused by backing mining, especially the impact of coal gangue on the quality of Ordovician limestone karst water [22]. The main purpose of this research was to study the effect of coal gangue immersion on different types of karst water hydro-chemical composition using experimental methods of water rock immersion.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Coal Gangue on the Hydrochemical Components under Different Types of Site Karst Water in Closed Mines

Jiang¹,

et al. 2022

Water

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In order to explore the potential effects of abandoned coal mines on the water quality of Ordovician limestone aquifers, water-rock interaction simulations were conducted. After the closure of the coal mine, the karst water in the goaf area and the waste gangue had a geochemical reaction, and the above-mentioned water-rock process was simulated by an indoor static immersion experiment to explore the differences in the effect of different types of karst water on the dissolution of gangue. The basic water quality parameters pH, EC (electrical conductance), and ORP (oxidation-reduction potential) showed different trends in karst hydro-immersion solution and ultra-pure hydro-immersion solution; pH and EC had greater fluctuations in two sets of ultrapure hydro-immersion solutions, while ORP fluctuated more widely in three groups of karst hydro-immersion solutions. In addition, gangue minerals dissolved more significantly in bodies of water where limestone was added. The results of chemical component clustering showed that TDS (total dissolved solids) and EC were homopolymerized in each immersion solution, and subsequent correlation analysis showed that TDS and EC clusters were more significantly affected by mineral properties in ultrapure water-immersion solutions, and more affected by dominant ions in karst water-immersion solutions.

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Section: Analysis Of Basic Water Quality Parameters For Different Imm...mentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Effects of Coal Gangue on the Hydrochemical Components under Different Types of Site Karst Water in Closed Mines

Jiang¹,

et al. 2022

Water

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“…Moreover, the initial concentration of different chemical components in water and the release law over time are analyzed by changing the experiment parameters. So far, many scholars have done a lot of work on water pollution caused by wastewater discharged during the process of coal mining [19], but there is less research about the impact of coal gangue on the quality of Ordovician limestone karst water caused by closed coal mines [11]. The snake point distribution method and polypropylene shovel were used to collect coal gangue at 15 points in the 3112 working face at a burial depth of 358 m. This was done after removing the surface dirt from the sample and immediately storing it in a clean and sealed polypropylene bag for decolorization.…”

Section: Static Immersion Testmentioning

confidence: 99%

Effects of Site Karst Water on Fresh Coal Gangue at Baizhuang Coalfield, China—Leaching Characteristic

Jiang¹,

Lin²,

et al. 2022

Water

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In mining areas where gangue is used for infill mining, Ordovician limestone karst water is affected by discarded gangue, and the water quality changes significantly. In this study, the effects of gangue on water quality change under different immersion solution conditions were evaluated by Zhai Zhen Coal Mine, Hongqi Coal Mine Ordovician Limestone Karst Water, and Baizhuang Coal Mine. The results showed that the cations in each group of immersion solutions had similar trends, and the Na+ concentration fluctuations were greater in karst water immersion solutions with higher initial sodium ion concentrations, while the fluctuations of calcium and magnesium ions were more obvious in the early stage of immersion, and the fluctuations were gradually slowed down in the later stage. The anions in the immersion solution also have a similar fluctuation trend, but only in the early stage of immersion. By comparing the changes of the three indexes (pH, TDS, and ORP) in the immersion solution, it was found that highly mineralized karst water had a good buffering effect on the changes in the basic water quality index, while the ultrapure water quality index with low salinity had the greatest change. The 100% stacked columnar plot between the main water chemical ion changes shows the relative scale relationship of the water chemical components in the immersion solution at each period, and the water chemical components change significantly in the early immersion period (0–7 d), and then enter the fluctuation changes period, and the ion changes in the fluctuation changes period are mainly Na+ and SO42− ions. This study provides a theoretical basis for exploring the changes of gangue to the quality of karst water in Ordovician limestone and also provides theoretical guidance for the study of groundwater pollution mechanisms in closed coal mines.

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“…soil, air, or water) and reach receptors (e.g. humans) and produce undesirable effects (Hasheela et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Assessment on the Environmental Conditions of Abandoned and Inactive Mines in the Philippines

Samaniego¹,

Gibaga²,

Tanciongco³

et al. 2020

AJSTD

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Most abandoned and inactive mines in the Philippines pose high risks to human health and the environment due to the disturbed and exposed heavy metal-laden soils and sediments and water-filled open pit mines. Establishing these mines’ environmental conditions remains a challenge as it requires time, effort, resources, and faces a lack of funding as the economic phase of the mine has already ceased. In order to contribute to the solution on the assessment of abandoned and inactive mines, integrated methods with combined essential testing, sampling, and analyses of different environmental media present in the mine site are suggested in this paper. On-site and laboratory methods include analyses for water (surface water and groundwater characterization, quality assessment, and environmental isotope tracers), soils and sediments (heavy and trace metals, anomalous elements, erosion, and nutrient availability), air quality, and radiometric survey. These methods can be classified as rapid with complete data, and information can be gathered to support a health risk assessment in the area, as well as used as a guide for rehabilitation prioritization of the abandoned mines.

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Risk assessment methodology for shut-down and abandoned mine sites in Namibia

Cited by 10 publications

References 2 publications

Effects of Coal Gangue on the Hydrochemical Components under Different Types of Site Karst Water in Closed Mines

Effects of Coal Gangue on the Hydrochemical Components under Different Types of Site Karst Water in Closed Mines

Effects of Site Karst Water on Fresh Coal Gangue at Baizhuang Coalfield, China—Leaching Characteristic

Comprehensive Assessment on the Environmental Conditions of Abandoned and Inactive Mines in the Philippines

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