How can I deter moles from eating my garden?

This is my first summer in my new home. I have a raised garden that backs onto a green space (we have just a chain link fence). Over the past few weeks, my plants have slowly been disappearing. Now I'm not talking a few chewed leaves or something, the plants literally disappear and there is no evidence a plant was ever there.The culprit leaves behind a small mound of dirt, so I'm suspecting a mole; although, I've seen it. So far it has taken 3 squash plants, a pumpkin plant, some spinach, cucer and even a myrtle (perennial but not a veg). Is there any hope of having a viable garden in this space or am I doomed?