The understanding of source and flow path of the groundwater provides important strategy for the environmental management of the mine area. Then, in order to clarify a source and flow paths of groundwater around a closed mine, stable isotopes of hydrogen and oxygen and water quality of river water and groundwater sampled from the mining shafts and levels in the Hosokura mine were studied. The hydrogen and oxygen stable isotopes indicating altitude effect for river water and the chemical character of sampled water suggest groundwater flows mainly from the north area of Hosokura mine to the ore bodies under the center of the mine area. The distributions of total head and darcy velocity calculated by the numerical simulation analysis show down streamlines from highland to the ore bodies and correspond well with the flow system estimated from stable isotopes and water quality of the sampled water.
