A steady performance and reliability of long-distance belt conveyor transportation depends among others on the size of transported material particles. If coal or overburden is excavated by shovel excavators with large volume shovels or by bucket-wheel loaders with large volume buckets, it is necessary to reduce the material size before it is loaded on the conveyor. Crushers are used in opencast mines for this purpose. The crusher design results from its purpose, characteristics of the crushed material, requested capacity, input and output particles size. Due to the high transport capacity of the long-distance belt conveyors, the crushers that have proved the best for primary crushing of coal and especially overburden layers are double-roll crushers with toothed rolls. They have good permeability even for materials with hard partings and they do not easily overload by sticky materials.