The rivers of Mongolia belong to the inland catchment basins of the Arctic Ocean, the Pacific Ocean and Central Asia Inland Basin. The higher and middle Selenge, the biggest river in the country and part of the Yenissei river belongs to the Arctic Ocean drainage basin.

Four independent silver deposits were discovered in Mongolia, and exploration works were carried out in the deposits. The main source of silver, reflected in the state reserves statistics, is silver-bearing, non-ferrous metal deposits. Most part of the silver reserve in the state reserve registration is allotted to the Asgat silver-sulfate, the Tuv and Mungun-Undur silver-mixed metal deposits. The silver reserve will be increased during exploration works of soil and mixed-metal deposits.