Wow i don't even remember writing the above post ... sorry guys
I finally have the landmines destroyable by projectiles & collisions with soldiers & vehicles. Thanx to Mr. Pink Balls for changing the mat id on the landmine standard mesh for me. Also i totally forgot that i had made a new damage system for the same map to have head shots as instant kills... so i didn't have the new landmine material setup for the new projectiles materials.
This AP mine is a spawned object that can be placed anywhere on the map. It'll explode on any collision ... even if you drop something on it like a grenade. Unfortunately it has a 1 sec delay/fuse. Thanx everyone for the help!