Abstract: Nanminghe Iron Mine and Wannian Coal Mine of Hebei province, belong to the same hydrogeological unit with coal ore in the upper permo-carboniferous system and iron ore in the contact metasomatic mineralization of ordovician and pyrolith at the bottom of coal mine.High-volume pit water gushing, high pressure on the lower coal mine, and complex mine hydrogeological conditions directly threaten the safety of mining.Through analyzing the characteristics of the mine hydrogeological system, the volume of pit water gushing is forecast by using the numerical method.In the light of the hydrological conditions and relationships between the two mines, with the reference of mine exploitation program, a scheme that two mines share the dewatering and drainage system is proposed to uniformly solve the mine flood, which will avoid overlapping construction and save large amount of infrastructure and operating costs.

Key words: Flood mine, Groundwater system, Karst, Control of water