Abstract: The iron oxide-copper-gold (IOCG) deposit is an important deposit known since 1990's and is paid more attention by scientists and researchers in mining fields due to its large economic and scientific values.In light of new information and documents in recent year, the IOCG deposit is defined as a kind of hydrothermal Cu or Cu-Au deposits family with low sulfide and high iron oxide (magnetite±hematite with low Ti content).Its characteristics are as follows: valuable metals mainly as Cu, or Cu-Au with low sulfide; hydrothermal deposits with extensive Na-K alteration; strong structural controls; abundant magnetite and/or hematite with low Ti content; no clear relations with igneous rocks.Based on the genetic type of deposits, IOCG deposits can be classified into three types as magmatic IOCG deposits, non-magmatic IOCG deposits and hybrid IOCG deposits.

Key words: IOCG deposits, Concept, Characteristics, Classification