In recent years, the mining scale of Yongcheng mining area has gradually expanded. Land subsidence and surface cracks caused by coal mining have turned countless fertile fields into swamps, and farmers have lost the land on which to live. According to relevant data and calculation results, the collapse rate of 10,000 tons in Yongcheng mining area is as high as 6.85 mu. At present, the collapse rate of 10,000 tons of ground caused by single coal seam mining exceeds 10 mu.

According to estimates, after the completion of all mining areas, the estimated subsidence area is 5 15 square kilometers, accounting for 25.7% of the city's total land area, of which cultivated land accounts for more than 70%.

According to statistics, mines that have been put into operation at present discharge more than 50,000 cubic meters of sewage every day. Because the mine water contains harmful substances, it not only pollutes the surface water, but also changes the properties of the soil, resulting in a large area of crop production reduction.

Around 2007, yongcheng city Bureau of Geology and Mineral Resources and China University of Mining and Technology jointly carried out the research on the sustainable development strategy of Yongcheng coal mining area, and made an investigation on the relevant situation of Yongcheng coal mining area.

"At present, there are 5 exploration areas 10 pairs of mine fields in the whole mining area, and 9 pairs have been developed and utilized." Jiang said that the design life of the whole mining area is 100 years, but according to the actual production capacity, the time for coal mining will be greatly shortened. For example, the original design capacity was 1005 million tons/year, while the actual coal output last year was150 thousand tons, which was half of the design capacity.

According to the prediction of yongcheng city Bureau of Geology and Mineral Resources, the output of Yongcheng mining area will reach 20 million tons in 2009, which is twice the designed output. All these have accelerated the exhaustion of coal resources.

According to statistics, among the 3.243 billion tons of proven coal resources in yongcheng city, except for nearly 600 million tons of natural coke and some small mines with poor conditions, the exploitable resources are only 265.438 billion tons.