Abstract: The Salt Lake water could be classified as Na-Cl type brine with more dilute compositions in the deep zone. Major ion concentrations, in general, exhibit evaporation dependent evolution trends that are further modified by precipitating halite, gypsum, aragonite, and calcite minerals. In the main zone, sediments arc dominant ly composed of gypsum, huntite, magnesite, and polyhalite minerals whereas in the deep zone, Mg-calcite and dolomite minerals are the major constituents in the sediments. Thermodynamic saturation calculations to the lake data suggest that the models based on the specific ion-interaction and the ion-associationformulations could be used to determine the precipitation of evaporate minerals observed in nature. The overall prediction quality ofboth models is similar for the lake water with ionic strengths ranging from 1.35 to 8.5 calculated on t lie molal scale. Moreover, suchmodels are found to be very useful tools for the evaluation of the sediment mineralogy in the light of active precipitation.