Micro-fine disseminated gold deposits are hosted in the Triassic Baipeng Formation(argillaceous siltstone and arenaceous mudstone) in the Youjiang Rift, South China. Physicalproperties (grain size, specific surface, porosity and permeability) of the hod rocks are studiedwith respect to ore-fluid circulation, water-rock reaction and the effective volume from whichore-components could be extracted. On this basis, it is considered that the ore-fluid and oresmetals were extracted mainly from the strata and hydrothermal solutions, tending to move towards low-energy sites, deposting their gold in fault zones at the margins of the basin and inthe circle fracture systems around nuderwater uplifts. The gold deceits resulted from the deepcirculation of hydrothermal solutions, probably aided by multi-stage superimpeition. Thequantities of ore-fluid necessary to form the deposits were estimated. Micro-fine disseminated gold deposits are hosted in the Triassic Baipeng Formation (argillaceous siltstone and arenaceous mudstone) in the Youjiang Rift, South China. Physical properties (grain size, specific surface, porosity and permeability) of the hod rocks are studiedwith respect to ore- fluid circulation, water-rock reaction and the effective volume from which core-components could be extracted. On this basis, it is considered that the ore-fluid and oresmetals were extracted mainly from the strata and hydrothermal solutions, tending to move towards low-energy sites, deposting their gold in fault zones at the margins of the basin and inthe circle fracture systems around nuderwater uplifts. The gold deceits resulted from the deep circulation of hydrothermal solutions, probably aided by multi-stage superimpeition. Thequantities of ore-fluid necessary to form the deposits were estimated.