ABSTRACT
Results of leaching experiments in water at 25°C and 90°C with muscovite-biotite and lepidolite-amazonite granites of the Orlovka Ta deposit (Transbaikalia, Russia) are presented. The experiments illustrate that lepamz granite gives mostly higher concentrations for elements in the solutions but two-mica granite gives solutions enriched in lanthanides. Enhanced temperature has a different and complex effect on the leaching process related to chemical element and type of rock. The ratio of the leaching rates at 25°C and 90°C can also radically change for different run times. Generally the rate decreases with time by 10-100 fold. These data are important for estimation of toxic element migration in the abandoned mining fields.
