Abstract：With the research on the geological data obtained from Keveoul exploration area of bauxite in Boke of Guinea, the ore forming mechanism and the ore controlling factors are analysed.Results show the weathering profiles are usually comprised of three main zones, which are duricrust, nuclear zone and saprolite from top to down.Ore mainly distributes in duricrust and nuclear zone.But chemical analysis indicates that Al and Fe compound is enriched upon the nuclear zone, and SiO2 contents is high below the nuclear zone.In the upside of weathering mantle, the separation of Al and Fe is obvious.So we can use the phases theory to discuss the process of the bauxite deposits forming by the parents rock migration through geochemical elements.In the meantime, the influence of physiognomy, hydrogeologic elements and so on upon the bauxite deposits is analyzed.

Keyword：lateritic bauxite deposits;weathering profiles;ore forming mechanism;ore controlling factors;