The Jinshan gold deposit, the largest gold deposit south of Yangtze River of China, with a reserve of 200 tones, is hosted by the Jinshan ductile shear zone. The shear zone is associated with a magnificent supracrustal Proterozoic mélange—suture zone, i.e. the Northeastern Jiangxi Deep Fault Zone. The shear zone is hosted within a Mesoproterozoic (1300～1500 Ma) metapyroclastic—turbidite sequence. The mineralized faultfilled quartz veins that are elongated and boudinaged along with mylonitic foliations serve as main ore bodies. Deformation structures observed in the ductile shear zone and the sheared auriferous quartz veins at various scales indicate a syndeformational mineralization associated with a progressive deformation. The segregation character of the quartz veins is consistent with pervasive and significant pressure solution observed in the shear zone, suggesting an insitu source of ore fluids. Gold precipitated in response to fluids phase separation and fluid—rock interaction caused by pressure fluctuating as a result of periodic faultvalve activities. It is concluded that the Jinshan deposit is syntectonic, the gold mineralization is closely with progressive deformation.