This study was stimulated by the problems with crude ore screening in the “Polska Miedź” SA. company The process of screening preceding ore crushing is performed using screens which do not guarantee a desired process efficiency. The existing single-plane screens do not ensure proper segregation of crude ore layer on the sieve, and consequently, not all particles which represent undersize fraction have a chance to fall into mesh and pass through it. In this situation the problem should be solved using various means, i.e. a variety of actions should be undertaken to obtain proper characteristics of the screening process. The first one is to propose a new schematic of screening which should be carried out on 4, and in an extreme case on 3 sieve levels. Another action should encompass the application of a linear-elliptic screen. The third innovation can be the use of cascade (stepped) sieves, in particular for two lowest screens on which the proper ore classification is performed. The last one seems to be the application of a feeder which supplies the feed to the sieves of screening machines.