Moles and gophers can be distinguished by the types of tunnels they create. Since the moles' tunnels are visible atop the ground, they are the easier to identify of the two. Mole hills are circular with an exit hole in the middle, while gopher mounds are fan-shaped with an off-center hole.What you can do about it largely depends upon the state in which you live. On my friend's ranch in Montana, we went target shooting. Seriously though, the supplied link offers several solutions. Good luck.
www.hgtv.com