Determining the factors controlling the chemical composition of groundwater using multivariate statistics and geochemical methods in the Xiqu coal mine, North China
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Studying the hydrogeochemical processes that control groundwater quality in different aquifers helps to identify the sources of inrush water into coal mines. In this paper, 65 mine water samples were collected from Xiqu coal mine during 2016 and 2017 to determine the hydrogeochemical processes and controlling factors of mine water using hydrochemical methods and multivariate statistical analysis. The mine water is acidic to alkaline in nature. The dominant anions in the mine water are SO42− and HCO3−, and cations were dominated by Ca2+ Na+, and Mg2+. The dominant hydrochemical facies of groundwater were SO4–Na·Ca and SO4–Ca·Mg water types. Based on multivariate statistical analysis, four principal components and two clusters were obtained. Concentrations of SO42− showed significant positive correlations with Ca2+, Mg2+, Fe2+ and Fe3+, and strong negative correlations with HCO3− and pH. The mine water chemistry was dominated by the oxidation of iron-bearing sulfide minerals, cation exchange and the dissolution of silicate, carbonate and sulfate minerals. In addition, human activities such as agriculture are also likely to have influences groundwater chemistry at the mine site.
KeywordsXiqu coal mine Mine water chemistry Hydrogeochemical processes Multivariate statistics
This research was supported by the Xiqu Coal Mine, XiShan Coal Electricity Group Co., Ltd. The authors sincerely thank editor and reviewers for reviewing the manuscript.
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