Modeling of groundwater recharge and discharge in Tomitaka mine, Miyazaki Prefecture

Tomiyama, Shingo; Hiroyuki,; Koizumi, Y.; Metugi, Hideya

doi:10.5917/jagh.52.261

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…Saturated-unsaturated groundwater flow analysis was applied to evaluate groundwater flow using Dtransu-3D-EL software [42,43] together with G-TRAN/3D pre-and post-processing softwares for Dtransu-3D [36,40]. Dtransu-3D-EL software solves the equation for saturated-unsaturated groundwater flow derived from the mass preservation and Darcy's equation, which can be written as…”

Section: Theoretical Equationmentioning

confidence: 99%

“…Some studies pointed out that groundwater flow patterns in and around mines should be evaluated to purpose countermeasures against AMD reduction. There are several methods of the mitigation, such as covering of ground surface with low-permeable layers and impoundment of land subsidence [35][36][37][38][39][40][41]. In this study, the effects of backfilling the underground space in a mine on produced AMD were examined by 3-D groundwater flow model to reduce the AMD produced because the mine selected has a huge volume of underground space already excavated.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Backfilling Excavated Underground Space on Reducing Acid Mine Drainage in an Abandoned Mine

et al. 2020

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Three-dimensional groundwater flow around an abandoned mine was simulated to evaluate the effects of backfilling the excavated underground space of the mine on reducing the acid mine drainage (AMD). The conceptual model of the groundwater flow consists of not only variable geological formations but also vertical shafts, horizontal drifts, and the other excavated underground space. The steady-state groundwater flow in both days with high and little rainfall was calculated to calibrate the model. The calculated groundwater levels and flow rate of the AMD agreed with the measured ones by calibrating the hydraulic conductivity of the host rock, which was sensitive to groundwater flow in the mine. This validated model was applied to predict the flow rate of the AMD when backfilling the excavated underground space. The results showed that the flow rate of the AMD decreased by 5% to 30%. This indicates that backfilling the excavated space is one of the effective methods to reduce AMD of abandoned mines.

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Section: Theoretical Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Backfilling Excavated Underground Space on Reducing Acid Mine Drainage in an Abandoned Mine

et al. 2020

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“…At two mines, the flow rate of AMD increased due to the inflow of rainwater via inclined drifts and shafts [2,3]. However, there are several methods for reducing the flow rate of AMD by covering the ground surface with a low-permeable layer or backfilling the excavated area [4][5][6][7][8][9][10]. For example, the flow rate of AMD in a closed mine was reduced by up to 61% regardless of the rainfall intensity if the excavated area was backfilled with low-permeable material [8].…”

Section: Introductionmentioning

confidence: 99%

Improvement in pH and Total Iron Concentration of Acid Mine Drainage after Backfilling: A Case Study of an Underground Abandoned Mine in Japan

et al. 2021

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If the excavated underground veins are not backfilled, they may be a factor in the continued outflow of acid mine drainage (AMD). The flow rate of AMD can be reduced by backfilling underground drifts from abandoned mines. In addition, the quality of AMD may be improved as the flow rate of AMD reduces. In this paper, the quality of the AMD after backfilling was evaluated by a three-dimensional geochemical analysis model when the groundwater level was recovered after backfilling. The measured dissolved iron (Fe) and sulfate ion (SO42−) concentrations and pH before backfilling the drift were reproduced by the calibration of the simulation. Using the calibrated model, the pH at the outlet of the drift was changed from about pH 3 before backfilling to about pH 4 to 5 after backfilling. When calcite was contained in the filling materials of the drift, the pH approached neutral. However, when gypsum was formed, the neutralization was inhibited. The Fe concentration discharged from the drift was calculated at approximately 0.002 mol/L before backfilling. The total Fe concentration was calculated at 0.0004 mol/L or less after backfilling, and the dissolved Fe concentration decreased by several orders of magnitude after backfilling. A geochemical model quantitatively evaluated the improvement in water quality after backfilling the drifts. This method can be applied to the other abandoned mines with similar hydrogeological conditions.

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Acid mine drainage sources and hydrogeochemistry at the Yatani mine, Yamagata, Japan: A geochemical and isotopic study

Tomiyama

Igarashi

Tabelin

et al. 2019

Journal of Contaminant Hydrology

100

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Modeling of groundwater recharge and discharge in Tomitaka mine, Miyazaki Prefecture

Cited by 6 publications

References 6 publications

Effects of Backfilling Excavated Underground Space on Reducing Acid Mine Drainage in an Abandoned Mine

Effects of Backfilling Excavated Underground Space on Reducing Acid Mine Drainage in an Abandoned Mine

Improvement in pH and Total Iron Concentration of Acid Mine Drainage after Backfilling: A Case Study of an Underground Abandoned Mine in Japan

Acid mine drainage sources and hydrogeochemistry at the Yatani mine, Yamagata, Japan: A geochemical and isotopic study

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