『Abstract
　Environmental damage, to a greater to lesser degree, is caused by coal mining. On the basis of analyzing the hydrogeological conditions of the mining areas, this paper provides a sum-up of the characteristics of water disasters in North China-type Coalfield. Researching into the Baimai Spring group, this paper explores the relation between karst water and groundwater of coal-measure strata, using the methods of pumping test, dynamic observation, and tracer test. After working over the impact of mine water-inrush on spring dynamics, this paper estimates the contributory level of karst water to mining drainage. This paper hold that the mine water-inrush mainly results from karst water, with the fault structures acting as channels; the keys of mine water-inrush are faulty density, intersection and endpoint fault. Finally, this paper suggests that mining below Mine-9 be forbidden, and that below Mine-7 be properly mined, which provides the scientific basis for preserving springs and preventing water disasters in the mining areas.

Keywords: Karst springs drying off; Mine water-inrush; Baimai Spring; North China-type coal field』

Introduction
Characteristics of water disasters in North China-type coal fields
Geological background of the researched region
A study of the influence of coal mining on Baimai spring
　An analysis of the relation between mine water and Ordovician karst water under normal mining conditions
　　Variance in water level between groundwater and karst water shown by dynamic observation of groundwater
　　Weak hydraulic connection between groundwater and karst water in the goaf area proven by pumping test
　　Weak hydraulic connection between karst water and groundwater in the coal-bearing strata proven by tracer test
　Analysis of the influences of mine water-inrush on spring water
　　Water-bearing strata
　　Estimated ratio of Ordovician groundwater to coal mine drainage
　The relation between faults and flooding coal mine
Conclusions
Acknowledgments
References