Mining area limits

In my first playthrough, I ordered mine excavation too close to a control tower. As the voxels deformed around it, the assigned vehicles "lost connection" and wouldn't function. (I think the message was something about them being unable to find home or something.) Only allowing the mining area to be on voxels which won't cause this condition would be most welcome.

Planned feature "Retaining walls for mining designation." will probably resolve this issue