Hydrogeochemistry of Aquifers as a Function of Underground Mining of Gondwana Coal: Eastern Fringe of Raniganj Coalfield, India
Journal Title: International Journal of Research in Chemistry and Environment (IJRCE) - Year 2012, Vol 2, Issue 4
Abstract
Locations closer to the coalmines show higher fluctuation of watertable and steeper hydraulic gradient indicating a change in the hydrogeological flow regime. The strong correlation (0.936) between Si and SO4 2- in pre monsoon indicates interaction between aquifer made up of silicate minerals and groundwater. Strong correlation between HCO3 - and SO4 2- demonstrate the formation of H2SO4 while groundwater traversing through pyrite bearing shale and coal and may dissolve heavy metals into groundwater. Mixing of groundwater in the aquifer through different recharge areas is envisaged by the presence of a number of hydrogeochemical facies as shown in Piper diagram. Zones of significant fluctuations of watertable corresponds characteristic seasonal variation of CAI. Oxygenated environment deep into the mines and exposition of fresh rock surfaces due to mining operations provide the opportunity to bring in a new set of rock- water interaction which results in to alteration of hydrogeochemistry of aquifers.
Authors and Affiliations
Chakraborty B. , Adhikari K. , Sadhu K. , Gangopadhyay A.
Keywords
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