[en] The possibility of using an EDXRF method for particle-size control of multimetallic ore slurry has been studied. Zinc-lead-iron ore slurry has been chosen as an example of multimetallic specimens. The influence of metals concentration, solids content and parameters of grain-size distribution on the accuracy of the method has been calculated. The proposed method was checked experimentally with the use of samples simulating Zn-Pb ore slurries. (author)