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Abstract ▼ AI-Helper

This study was carried out to evaluate the impact of the rain infiltration on the changes in the volumetric water contents (VWC), the electric conductivities (EC) by burying sensors underneath waste rocks to measure the water quality of the groundwater in the wells at waste rock and tailings impound...

This study was carried out to evaluate the impact of the rain infiltration on the changes in the volumetric water contents (VWC), the electric conductivities (EC) by burying sensors underneath waste rocks to measure the water quality of the groundwater in the wells at waste rock and tailings impoundments at the Geopung mine. Monitoring results revealed that both the VWC and EC increased at the same time depending on the rainfall. These mean that the soluble salts were already developed on the surface and in pores of mine wastes due to the past oxidation of sulfide minerals. According to measurements of VWC, the direction of the infiltration in flat surface was near vertical and the one on the slope surface parallel to the slope. These imply that the movement of infiltration was controlled by the geometrical characteristics such as slope or flat surface of the impoundment. In the rainy season, the groundwater level in the well at waste rocks was raised and then dropped rapidly while the readings in the tailings slowly responded to the rain due to the its low permeability. Chemical analyses of groundwater in wells showed that the water was very acidic with the high level of EC and some metals. It may be concluded that the soluble salts including the hydrogen ion and some ions had been flushed into the groundwater by the rain infiltration and thereby waste rocks and tailings had acted as sources of the acid rock drainage. It might be suggested that some countermeasures such as putting a covering on the mine wastes could be used to prevent the occurrence and spreading of acid rock drainage around the mine area.

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