Probally already known but using AoE abillities allows you to see hidden mines.
not gamebreaking just a little find, it doesn't seem to happen with every AoE (only the AoE's that would damage the mine directly (burning ground from flare does not reveal for example))

Meteor Shower
http://steamcommunity.com/sharedfiles/filedetails/?id=608462452
Boulder Bash
http://steamcommunity.com/sharedfiles/filedetails/?id=608472636
Lower Resistances
http://steamcommunity.com/id/gtadekok/screenshot/352772708661381869
Rain
http://steamcommunity.com/sharedfiles/filedetails/?id=608473386