Relevance. For many centuries, mankind has been using the sources of healing waters. Mineral water is used for both treatment and prophylaxis. Moreover, its healing properties were manifested with widespread use. Already starting from the XV century BC Indian Vedas gave an idea of ​​the unique properties of mineral waters. Water from mineral and fresh sources was used for hygiene and healing purposes in the Ancient World, in particular in Egypt, Babylon, Assyria. It should be noted that groundwater has always been highly appreciated. The research is caused by the need for a comprehensive study of the Nizhne-Karmadon field to replenish mineral water reserves in the Russian Federation. The main aim of the research is the comprehensive analysis of chemical composition of mineral waters of the Nizhne-Karmadon deposit and determining the physicochemical and medicinal properties of the mineral waters of the deposit. Objects: mineral waters of the Genaldon gorge, Nizhne-Karmadon deposit, Kazbek-Dzhimarai massif. Methods: structural-tectonic method, analogy method, modeling method, geophysical methods – thermal logging of wells, facies analysis method, geomorphological method, subsoil geometrization method. The geothermal conditions of the subsoil area were assessed by measuring the water temperature at the wellheads. Results. According to the studies carried out, according to GOST R 54316-2011 and «The main criteria for the chemical composition of mineral waters», the waters of the deposit are low and medium mineralized, sodium chloride, boric, high thermal. In terms of physical, chemical and medicinal properties, the mineral waters of the subsoil area of ​​LLC Ariana are recommended for medicinal and drinking purposes in accordance with the attached medical indications. Based on the value of the constant discharge of mineral waters in the area of ​​the deposit in the amount of 18,200 m³/day, the mineral water reserves of the site are fully provided with sources of formation.