Received in the revised form:

The objective of the research consisted in comparing the operation efficiency of a separator provided with fixed screens mounted to the shoe and the one fitted with spring-mounted screens, determination of the impact of the basic kinematics parameters on the separation effi-ciency. Analysis was also carried out regarding the use of cylindrical spring-mounted screens and flat spring-mounted screens. The process of mass movement on the screen surface was examined also including the movement upward, downward and throwing up. The values char-acteristic for the separation process were output (capacity) of screens and the impurity separation degree. The analyzed kinematic parame-ters included: screen shoe vibration amplitude, screen vibration ampli-tude, screen inclination angle, screen vibration operation angle, own vibration frequency, kinematics limits coefficient. As a result, the mathematical models of separation were determined regarding the unit efficiency and the impurity separation degree. Next calculation base