The simulator < Shock Wave Stress and Displacement>  depends on equations which are based on the fundamental laws of Physics, of Chemistry, and of Rock Mechanics.  It simulates the mechanisms which occur during a blast from the time of initiation till the burst out of the rock mass; in particular, it simulates the speed of the fragmentation front that is created inside the rock mass during a blast.  Thus the simulation supplies the time lapse needed for the fragmentation front to reach the vertical free face of the bench; this time represents the Minimum Delay.  Each simulation with the simulator < Shock Wave Stress and Displacement > tells the user the value of the Minimum Delay.