Moles dig just below the surface looking for grubs and worms. Because they are just below the surface they usually make a hump above the surface that you can see just where they have been. Gophers on the other hand are vegetarians and eat plant roots. They never have runs just under the surface. Did you dig down to see where the hole led to? Pocket gophers usually dig at night or early morning. They also never leave the hole open. If you dig it open, come back the next day and it will be closed. If you trap one or more from that family of holes(mounds) and then leave the hole open, if there are any more gophers down there, they will close the hole, guaranteed. Moles don't make mounds per se. They occasionally will push dirt up as they are making their way just under the surface. And it will look more lumpy. The gophers mound will be fine, like pulverized dirt, and usually much larger than the moles.