While digging around the bottomless sea of crappy leaked maps i discovered airmine_test, balloonmines, airmines and scurrymines.
airmines and Balloonmines represent the early rollermine as a placeholder that is connected to the ground with a wire, they are exactly the same and behave like any other mine, if anything touches them they explode.
Scurrymines are an entity that is under the ground at all times, in the map it is shown coming out of the ground and burrowing back in, they use the wasteland scanner model as a placeholder and they dont do any damage at all.