Data of radiation monitoring in a Bulgarian uranium mine having worked in 1974 - 1985 by the sulfure acid leaching are presented. The observed average levels of contamination are as a rule below the acceptable levels. A short sharp increase in the radium content of the surface waters is established which is connected mainly with technological disturbances, as well as a slow and delayed increase of radium content in the underground waters. The range of this monitoring is evaluated rather as a mandatory minimum than as a system of comprehensive information about population radiation doses. Some trends of future investigations are formulated. 3 figs., 8 refs.