Abstract: The paper shows the means that G. priedrich and other economic geologists explain the sources and precipitation conditions of gold-bearing solution according to the studys on mineragraphy, alteration petrography, fluid inclusions and sulfide phases. The paragenetic studies of the gold occurrences document the stages of mineralization. Based on the fluid inclusions and mineral assemblages in ores, the temperatures and the pH value ranges of the stages can be identified. By using of loga (O₂)-pH and loga (S₂)-loga (O₂) diagrams the physicochemical conditions of gold mineralization can be detuced. Based on the study Rodalquilar gold deposit Spain, they proposed that gold in epithermal gold deposits has been transported as Au(HS)^-1 by fluids of moderate pH and reducing properties. The reason for gold precipitation in the near surface environment must have a rapid decrease in pH and total sulfur activity and an increases in oxygen activity.