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The groundwater problem at Mae Moh mine has drawn attention as the mining excavation goesdeeper, thus resulting in detailed investigation of hydrogeological condition. One of the problemsfacing the mining is floor heave influenced by groundwater. The control of groundwater pressure indeep-seated aquifers with high elevation becomes important in the mining. In addition, theunderground water at Mae Moh mine is naturally contaminated by arsenic. Therefore, thedevelopments of 3D groundwater model of deep pit mine using Modflow simulation and thestudies of underground water treatment are needed for the future planning. The predictivesimulations were carried out for eight years (2007 to 2015). Because stability of the Mae Moh mineshows how can be closely linked to the water environment, this paper aims to report the field Visitsto the water related facilities of the mine, which were conducted during 2010-2013. The resultreveals that the potentiometric head level is strongly increased, which might be a potential risk forthe floor heave; thus, depressurization is required. Field measurements reveal pH level at 8 and arange of total dissolved solid (TDS) at 870-2020 ppm. Treatment efficiency shows that more than95% of the arsenic can be successfully removed using ferric chloride. |
