A simulation model of the performance of the longwall in underground coal mine is presented. The simulation model is developed with the help of our own simulation system MTSS, which contains a specialized library of mining equipment models and a coal seam model. The main goal of the simulation for coal mining technological processes in stoping face is the evaluation of productivity of a cutter-loader depending on different factors. Such factors are: technical parameters of a cutter-loader, size of a longwall face, conditions and constrains of technological processes in stoping face, geophysical state of a coal seam.