They are rich in various deposits, including metal ores, coal, precious and semi-precious stones, and since the 18th century have been the major mineral base of Russia.
Since the 18th century the mountains been the major mineral base of Russia. They are rich in various deposits, including metal ores, coal, precious and semi-precious stones.
They are rich in various deposits, including metal ores, coal, precious and semi-precious stones. Since the 18th century the mountains been the major mineral base of Russia.
They are rich in various deposits, including metal ores, coal, precious and semi-precious stones. Since the 18th century the mountains been the major mineral base of Russia.