From what looks like a scan from ancient Yugoslav National Army “How-To” booklets comes this diagram of how to rig a mortar up be used as an “improvised mine” or IED.
Projectiles of various types (Diagram 135) and calibres (artillery rounds, mortar rounds), may be used as improvised mines. Prior to setting it up, carefully remove the projectiles trigger, activation can be executed using a 200g blasting cap/fuse, by pulling or pressure plate. If these methods of activation are not available, an electric detonation capsule that is triggered using an electrical pulse may be put into the in the fuse.
Diagram 135 – Artillery rounds prepared and placed for action