In hydrogeological terms, the area of Baley can be considered as an intermountain artesian basin composed of Mesozoic and Jurassic sediments, framed by crystalline rocks, stretched almost latitudinally and coordinated with the broad tectonic valley of the Unda River. On the northern wing of the basin within the southern slopes of the Borshchovy Ridge, the southern Borshchovy hydro-mineral line can be traced, characterized by outcrops of cold carbon dioxide springs and dry gas jets. These are, for example, the Shurugunsky springs, the spring in the Semenovaya Pad, the Lozhnikovsky, Zhidkinsky and others. All these springs have water composition close to mineral springs of Darasun. With a small mineralization, the predominant in the composition of water are hydrocarbonates of magnesium and calcium. This so-called Darasun type of carbonic mineral waters is extremely widespread in the Daurian hydro-mineral area.