Abstarct: Tazreh coal mine is located in the northeast of Damghan. Excavation to extract coal is done inside the Shamshak formation and below the groundwater level. Due to the drilling below the groundwater level, the management of these waters is important in order to increase the mineral extraction potential. The most important and first step in the management of these waters is to study the hydrogeology and their origin. Also, due to the passage of these waters through various formations, especially Shamshak formation, the creation and potential of these waters' pollution is also raised. In order to carry out this research, 5 groundwater samples were taken from the different tunnels of the Tazere mine area to determine the main ions and heavy mextals concentrations and stable isotope values. The electrical conductivity varies between 1800 and 2800 μS/cm. So that the water entering the tunnels of the western part has more salinity than the eastern one. Sodium ion is the dominant cation in almost all samples and they have the predominant Cl-Na water type. The primary source of the groundwater in the study area is mainly local precipitation with Mediterranean origin. The data of the studied water sources are mainly lighter than the rains of the region and have a similar behavior to the snow samples. Therefore, it can be concluded that the recharge mechanism in this area is mainly done in the form of snow. Almost all ions have the same origin. baxsed on the pollution degree values, all water samples are classified as medium pollution in terms of the content of potentially toxic mextals.