Not sure it matters that much, but are you sure its moles and not gophers. I have had a full on war with moles for some time now, but my dad has been in battle with gophers. I have literally tried everything. The little traps where you pull the spring and it shoots down, the solar deterrant. Someone even told me an old wives tale about gum and I think I put someones kid that owns juicy fruit through college. I almost thought about filling the tunnels with propane and igniting. However, the tides have now turned since I picked this up at tractor supply.
http://www.tractorsupply.com/rodent-bait-traps/easy-mole-trap-trade--4208197What I do is press down all of the tunnels one day. Next day, see which tunnel is the "active" tunnel (the one that is raised up again. Slighty press down a little on the tunnel where you are going to set the trap, that way when they raise it up again, they set off the trap.