Acid rock drainage,and trace element pollution in groundwater in surrounding of Kurşunlu mine area [Kurşunlu maden alani{dotless} çevresindeki yeralti{dotless}sulari{dotless}nda asit kaya drenaji{dotless} ve İz element kirliliǧi]

Acid mine drainage occurs as a result of reactions with water and sulphide minerals such as pyrite. as a result of these reactions water gains acidic properties and significant water pollution problems could rise. the study area located in ortakent (koyulhisar) has an active pb-zn-cu mining site. the corelation and factor analyses applied to determine mineral-water reactions controlling the chemical composition of groundwater clearly show effects of sulphide mineral bearing volcanic rocks. sulfide minerals produce acid and groundwater contains high concentrations of so4 and fe. low ph values are also responsible for dissolved metals (al,fe,mn so4,pb,zn) in the groundwater and river. al,fe and mn concentrations in the acidic waters in the study area exceed the limits of ministry of health-2005 standard. in addition,several springs have so4 and pb concentrations higher than the limits of drinking water standards. solid and liquid mine wastes contribute on the trace element contamination of water as well. geochemical modelling showed that mostly heavy toxic metals in the acidic waters may exist largely in the form of free metal and metal-sulphate. it is understood that the trace elements contained in the groundwater and river could introduce high risks to human,animals and plants.