The initial quartz veins where ores or crystal-bearing mineralization formed from the same fluids of Cl-Na-composition are reviewed. The following evolution of hydrothermal system is conditioned by change of PT-parameters and pH of the fluid. A presence of НСОз'-bearing fluids is a necessary condition for the formation of a commercial crystal-bearing mineralization (this condition is created by a Cl-Na-fluid/carbonate reaction). Gold mineralization forms from the Cl-Na-fluid.