In order to study the environmental impact of coal mining, took Expanding and Improving Project on Xihe Coal Mine (EIPXCM) as an example to investigate and study. Firstly, investigated its coal bed structure and coal quality and summed up its features and scale. The results show that the located stratum is mantle fold with intensive cracking activities. The coal bed is thin and uniclinal with a dip angle of 35°. So long wall retreating mining method along the strike will be adopted. Sulfur and phosphorous in the coal are low as 0.25～0.35% and 0.001～0.007% respectively. A key winding inclined shaft and another inclined shaft for workers and air return will be built. Production capability of the mine is 60 000 t/a with 1.9 years of workable period. Secondly, water cycling, equilibrium, treatment, flying ash pollution, coal mine safety and entironmental influence are analyzed. The results are that the relative gushing amounts of CH4 and CO are 2.5 m3/t and 0.34 m3/t respectively. Coal-dust explosion index is more than 40%. It indicates a low explosion possibility. The project will inevitably lead to surface subsidence and collapse resulting in further soil erosion to some extent. Finally, some precaution measures are also proponed. This will lay a sound foundation for later entironmental influence assessment.
Analysis and research on coal quality in Hetaoyu coal mine
