The CoC mines are great, but I made a very simple 2 part addon: a dummy mine and a script, use with a trigger. The mine can be deleted after explosion.
The model for the dummy mine is a handgrenade, because when u place it on the ground, it looks like just the trigger of a buried ap mine. It's hard to see (esp depending on terrain and lighting), but not impossible.
I just camcreate an explosion. I've got "wound" and "kill" scripts - just bring the underground explosion closer to the surface. Sometimes running will get u off with minor damage, sometimes not.
The script is very simple, just a slight rework and short version of scripts by Bloodmixer and SEFE. I added deletevehicle to delete the mine after detonation, but I can only get this to work with a second script. I'm sure someone much smarter than me can make it work in one.
If anyone's interested, the addon is at:
www.rocket-comm.com/testit comes with 3 scripts (plain and "d" for death, and delmine for deletion)