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On the basis of the information obtained in the reconnaissance conducted since 1963 around Don Juan Pond together with the results of the DVDP core analysis, the salt and water balances in the Don Juan basin are discussed. The sequential changes of pond water characteristics for the period 1961-1976, and the description of evaporites in and around the pond are given. Assuming the presence of a paleolake, the volume of the lake was estimated as 1.2×10^7 m^3 from the paleolake shoreline or 2.6×10^7 m^3 from the salt deposits inventory. A water balance model applied to this paleolake, based on the measured inflow and evaporation rates, has resulted in an estimate of 100 years order of magnitude for the time required for the formation of the present pond.