If you have a base that you like to work in, build a wood stake wall around the whole thing. Enemies don't bother you if they can't see you, and they don't attack walls unless they know that it's the only thing keeping them from reaching you.

When mining, dig a deep trench around the outside of the whole thing. Not only does this reveal the rest of the ore since the majority of it is underground, but it also creates a pit between you and them that most won't bother crossing.