Bulk and granular material handling, as well as rock and powder processing, are processes present in many industrial branches. Starting from mining industry, agriculture, chemical and medicine, the behaviour of sands, ores, seeds and grains, fruits, pills and chemicals transportation and mixing can be modelled with use of the discrete element method (DEM). The discrete element method is a numerical modelling method where material flow (transportation, interaction with equipment, etc.) is modelled by the representation of the spherical particles (in the primary approach) collisions based on the solved Newton's equation of motion (explicit method). As said, the primary and most computationally effective approach is the use of spherical particles. One can see that the particles of real material are rarely represented by an ideally round shape. Continuing the computational cost demand, one has to trade between the true particle size (often µm range) and the requirements of the bulk volumes of material being transported in industrial processes. Many of those questions are already answered if we are talking about traditional materials. In the presented paper, challenges in DEM modelling of extraterrestrial minerals, specifically lunar regolith, will be presented.