Doğu Anadoludaki bir maden sahasının hidrojeolojik karakterizasyonu

Characterization of hydrogeological properties of water bearing rocks in a mine site is important for controlling groundwater flow to provide safe operating conditions. This study aims to characterize the groundwater flow in an active mine site in eastern Anatolia. Large diameter pumping wells were drilled in the surrounding carbonate rocks to determine the groundwater flow and boundary conditions along some critical cross-sections. Large diameter wells were also drilled in the mine site for hydraulic testing of the metasediments. Constant rate pumping tests and monitoring of groundwater levels were conducted at each well. Furthermore, twelve diamond core drilling were done in the mine site and a total 33 vibrating wire piezometers were installed at different depths for monitoring pore water pressures. Packer tests were applied on these wells to determine localized hydraulic conductivity of diorite and metasediments at different depths. The results obtained from these tests are used for developing hydrogeological conceptual model for groundwater flow. According to the results, the carbonate unit in the immediate vicinity on the mine site does not contain groundwater in significant amount because of diorite intrusion at the Uzundere-Zangardere area and the metasediments and diorite have low permeability and heterogeneous medium. Also, downward hydraulic gradient was observed in almost all piezometers drilled in the metasediments and diorite and it generally increases with depth. Stable isotope analysis has indicated that the metasediments-diorite are recharged by infiltration from local precipitation.