Abstract. Features of formation of drainage waters of the field Tyrnyauz are considered. Chemical composition of drainage waters is investigated; major factors of its formation are established. High ecological danger of installing drainage waters in hydrographical network of the district is defined and concretized.

Abstract. The paper presents data on the influence of coal-mining industry elimination on the deformation of land surface which can cause accidents and destructions of buildings and constructions located nearby the closed pits or mines. The analysis is carried out and the major factors which influence change of the intense deformed condition of the massif of rocks were revealed. The example of the monitoring system which will provide researchers with information for preparation of the project of a pit or a mine closing is presented, and it also will allow one to predict behavior of the massif in the future.