libri" size="3">East Gobi molybdenum deposit in Xinjiang is the first super-large deposit discovered in north- west China. It is located near the Yamansu fault and occurrs in low grade metamorphic Lower Carbonifer- ous clastic rock intercalated with volcanic rocksl. According to cutting relation of ore veins hydrotrhermal mineralization in the deposit is divided into 4 stages and mineral paragenesus is determined on basis of cut- ting, replacement and edge share relation of the minerals.