Physical-chemical modelling showed that interaction of hot seawater and basalts lead to mobilization of ore matter by the solution. Microfacial ore zoning could be a result of conductive solution cooling in the chimney wall. The appearance of different mineralogical varieties of chimneys depends on the degree of reac-tion passing in a water/basalt interaction zone within the temperature field of the cooling intrusion. Clarke contents of the rarest and trace elements in basalt are enough to form the independent solid phases of these elements in the chimney walls.