So, there's a few way to do this.
Here's how if you don't need to see the black-op placing the mine:
* Place a gamelogic where you want the mine to be located, name it whatever you want.
* In a script, trigger or initfield you put:
mine = "mine" camCreate (getPos nameoflogic)
* Place waypoints for the tank to move up the road
* Have a beer, coffee, soda or whatever you like and relax
I don't have the action handy that would let you see a black-op place the mine, but you can probably find that through searching the forum and the ed-depot.