Deposits of the so-called gold-silver formation have been known and developed since ancient times in Bohemia, Transylvania, and Hungary. They are numerous in the west of North and Central America, in Japan, New Zealand, Philippines, Fiji, New Guinea, Sumatra. In our country gold-silver deposits are widespread in the North-East and Far East, in Kazakhstan, Central Asia, they are known in Transcaucasia and Eastern Transbaikalia ...