A. V. Kryuchkov, Chief Engineer — Deputy General Director, e-mail: Kryuchkov_AV@sgok.ru; V. N. Chakov, Head of Concentrating Plant, e-mail: Chakov_AV@sgok.ru, "Stoilenskiy Mining and Concentrating Plant" Company.

The results of consistent improvement of technology and modernization of equipment at the stage of middle and fine grinding at benefication plant of “Stoilenskiy Mining and Concentrating Plant” joint stock company have been conduced. The general target of all measures is reduction of crushing product grain size (mill charge).