Hydrochemical interaction of brines discovered in the Stebnytsky deposit mine with containing kainite rock

The Stebnytsy deposit of potash salts is located in the inner Boryslav-Pokut subzone of the Precarpathian depression, Ukrainian Carpathians. The hydrogeological conditions of the Stebnytsky deposit are difficult, therefore mining operations are not carried out at the deposit, and only environmental protection measures are carried out. The mines are under conservation. During the period of operation of the deposit, about 30 million m3 of unfilled man-made voids were formed. To date, the suffusion and diffusion processes of the Stebnytskyi salt deposit have gone beyond the limits of the mine drainage of the deposit, and the deformation of the earth's surface threatens critical infrastructure facilities and residential buildings. As a result of the systematic regular observations of brine manifestations in the Stebnytsky deposit and studies of the processes of interaction of brines with the host rock, an idea was obtained about the peculiarities and regularities of the formation of the modern hydrochemical situation in the deposit, which in turn will allow to assess the degree of danger of individual areas in relation to the penetration of aggressive waters into underground workings salt mine. This article presents ideas about the nature of brines, the samples of which were taken from the revealed brine manifestations in the mine workings of the deposit. These ideas boil down to the fact that the vast majority of studied brines are brines of sedimentary origin and only a small part of them to one degree or another formed their composition due to salt leaching processes. Some regularities of changes in the chemical composition of solutions of sedimentary origin, which are formed in the conditions of deposits of sulfated potassium-magnesium salts, are considered. Research was conducted to study the interaction of brines with kainite rock, the results of the research allow us to establish the parameters characteristic of these solutions, and at the same time, to find out the secondary mineral formation that accompanies this process.