correct
Mines placed by the editor cannot be setpossed, deleted etc
hint format ["M1 = %1",_typeof M1"] will simply return "Obj"
weapons M1 will return "array"
as will magazines M1.
I've tried various approaches to try and help you, all to no avail
What you might try to do, is use something that looks similar to a mine, place a trigger near it to setdammage 1, or create satchel, setdammage 1, if a typeof tank passes by the trigger
and also add some actions to the mine look alike to give it the disarm actions etc. scripting your desired monitoring system into the addaction script