Abstract: Abstract: Study of halogen and silver in the Eren Tolgoi sliver deposit indicates that halogen shows lateral and vertical zoning. Ores on and near the surface are rich in I and Cl, while deep-seated ones rich in F; the orebody is rich in I and Cl, while the country rocks adjacent to ores are rich in F. There are close relationships between halogen and sliver. But the relationship between sliver and halogen differs with different ores type. F and Ag generally show a negative correlation, while Cl and Ag, I and Ag show a positive correlation. This indicates that halogen plays a very important role in activation, dissolution, long transport, precipitation and concentration of silver.