Ideally, lose the snack altogether. Eat enough rich, satisfying primal food at mealtimes that you're simply not hungry.
If you HAVE to snack, whether that sort of trail mix is a good idea depends on your goals. If you're trying to lose weight, I'd avoid it entirely. Dried fruit and nuts are too easy to eat too much of. When people get stuck on weight loss, the two primary reasons seem to be dairy and nuts.
Zone diet on and off for several years....worked, but too much focus on exact meal composition
Primal since July 2010...skinniest I've ever been and the least stressed about food