The epithermal Hg, Sb, and Au mineralizations in the rift zone of the kucuk Menderes, Western Anatolia, Turkey are considered as fossil analogues of active geothermal systems, based on geochemical, mineralogical, fluid inclusion and isotope data. First, gold mineralization at Kure took place at temperatures between 300 and 210 degreesC and was genetically related to a cooling magma chamber. Second, at Emirli, Sb mineralization was from fluids whose temperature ranged 260-180 degreesC. The last mineralizing event was at Halikoy Hg mineralization and formed at lower temperatures (200-130 degreesC). delta(13)C, delta(34)S, He-3/He-4, and B-11/B-10 data suggest a magmatic origin for volatile components. The studied epithermal mineralizations are comparable to other Hg, Sb and Au mineralizations in the rift zones of the Menderes Massif and may be considered as fossil equivalents of active geothermal systems.