Hydrochemical studies in the basin of the lower reaches of the Amur River within the Miaochansky Range proved the possibility of using hydrochemical methods to search for tin-polymetallic deposits in the mid-mountainous relief under humid climate. In this article, the features of the formation of the chemical composition of water in this area, touched on the issues of quantitative assessment of the results of hydrochemical searches.

The patterns of temperature distribution of rocks and waters in the northern part of the Russian Platform and the Baltic Shield are very poorly studied. However, the first summaries and schemes, covering only the southern half of the territory under consideration, showed the presence of thermal waters in the most submerged parts of the sedimentary cover. The study of hydrothermal zonality is necessary in the search for hydrothermal resources, to assess the prospects of distribution and integrated use of mineral waters in industry, in hydrotherapy, etc. ....