The aim of this paper is to determine the impact of physical and mechanical properties of rocks on the electricity consumption of jaw crusher during crushing. This paper presents a different approach to determine the energy consumption during comminution, where the energy required for crushing rocks was obtained by direct measurement of crusher's motor power during crushing of samples.By measuring the energy consumption for crushing rocks with different physical and mechanical properties, we explored the dependence of energy required for crushing on individual mechanical properties of rocks and the simultaneous effect of the properties. Using statistical analysis of the influence of individual mechanical properties we found that the greatest influence on energy consumption for crushing was compressive strength. Fracture toughness and tensile strength of the rocks have a significant impact on crushing energy. The effect of bulk density is not large, while for the hardness cannot be stated that it has influence. By the analysis of deviations of specific crushing energy calculated using equations obtained by multiple regression analysis of simultaneous influence of multiple mechanical properties of rocks, from the measured values, it was found that the dependence obtained on the basis of all investigated properties shows the smallest deviation and dependence obtained by compressive strength, fracture toughness and hardness shows significantly smaller deviation. By examining the influence of mechanical rock properties on particle size of crushed material it was found that the increase in compressive strength increases the proportion of larger particles, while other properties have no effect.