There are four mineralization types of gold in Central Inner Mongolia: mylonite type, quartz vein type, quartz potash - feldspar vein type and alteration type. Ore bodies of mylonite type were controlled by ductile shear zone. Both of ore and gangue minerals were undergone ductile deformation. Mineralization age is about 2040Ma and represents the metallogenetic process in deep tectonic level. There are three types of quartz veins differed from genesis mechanism. Small scaled, leas - shaped quartz veins formed during ductile shearing are found in mylonite ore bodies. Decation quartz veins are in the ore bodies of alteration type. Infiltration quartz veins are main gold - bearing bodies for some gold deposits such as Bainaimiao and Saiwusu gold mines. It also occurred in many other deposits from the middle Proterozoic to the Mesozoic. Quartz potash - feldspar veins are observed in the Palaeozoic and occurred in middle tectonic level. Gold deposits of alteration type such as Donghuofang and Saihudong occurred in shallow tectonic level of the Mesozoic. In short, from the Proterozoic to the Mesozoic, mineralization types varied from mylonite type to quartz potash - feldspar vein type and to alteration type. Gold - bearing quartz veins changed from syn - ductile - shearing quartz vein to infiltration vein and to decation quartz vein. Mineralization developed from deep to middle and to shallow level. There are four mineralization types of gold in Central Inner Mongolia: mylonite type, quartz vein type, quartz potash - feldspar vein type and alteration type. Ore bodies of mylonite type were controlled by ductile shear zone. Both of ore and gangue minerals were undergone ductile deformation. Mineralization age is about 2040Ma and represents the metallogenetic process in deep tectonic level. There are three types of quartz veins differed from genesis mechanism. Small scaled, leas - shaped quartz veins formed during ductile shearing are found in mylonite ore bodies. Decation quartz veins are in the ore bodies of alteration type. Infiltration quartz veins are main gold - bearing bodies for some gold deposits such as Bainaimiao and Saiwusu gold mines. It also occurred in many other deposits from the middle Proterozoic to the Mesozoic. Quartz potash - feldspar veins are observed in the Palaeozoic and occurred in middle tectonic level. Gold deposits of alteration type such as Donghuofang and Saihudong occurred in shallow tectonic level of the Mesozoic. In short, from the Proterozoic to the Mesozoic, mineralization types varied from mylonite type to quartz potash - feldspar vein type and to alteration type. Gold - bearing quartz veins changed from syn - ductile - shearing quartz vein to infiltration vein and to decation quartz vein. Mineralization developed from deep to middle and to shallow level.