The ore-magmatic system is represented by the thermal system formed from the zone of melting of mantle substance, where basaltic melt is produced and thermal column is formed above this zone. Water is appeared in the ore-magmatic system at the level about 20 km. It is extracted from the water contained minerals and from the pore fluid. Basaltic melt is saturated by the water in this interval. Fluid begin to go out from the melt at the level less than 10 km. It is able to extract ore elements from host rocks on this level. The next component of ore-magmatic system is the zone of discharging of hydrothermal fluid from ore components. The best condition for discharging of hydrothermal fluid is appeared when fluid goes out on the sea bottom.