| Yinjiagou pyrite locates in the southwestern of Lingbao city, and the 3rd pyrite lies to the east of ore clusters. It is mainly mining the middle part of 1000m, 950m, 900m, 850m and 800m level, and the middle part of 700m drift is opening up. The dolomite is widely distributed near the mine area with developed karst fissures and rich karst water. The underground mining has been facing serious hidden water disaster owing to larger depth of exploitation, mining area extended and mine discharge increased. And the paper studies the water inrush mechanism and mine discharge through the methods of comprehensive analysis of hydrologic geology, analysis of hydrochemistry, gray theory and time series analysis.Based on the rich geological data in the process of production, this paper identifies the development and distribution of karst fissure water and the structural fissure's development degree of main fault in mine area, passing the additional hydrogeological survey, geological drilling and geophysical prospecting method. It ascertains the relationship among atmospheric precipitation, surfacewater and groundwater by using characteristic analysis of hydrochemistry, stable isotope and tracer experiment, and analyses water filling source, water filling channel and the water burst mechanism of mine upon it. Finally, it establishes the GM (1, 1) model and time series analysis model of mine discharge on the basis of the gray system theory and time series analysis method, and precipitates mine discharge in the next two years. The normal mine discharge is 881.23m~3/h, and the maximum is 1057.48m~3/h, which provides reliable basis for the mine designing mine drain equipment and making plans to prevent and cure water in the future.
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