We do not see mite-generated galls on the pictured leaves (the pale spots might be minor infections, but nothing concerning), but in either case, yes, they are perfectly fine to use as mulch or garden bed top-dressings. Gall-making insects and mites might be reduced in population if the fallen leaves of their host tree were to be collected and shredded or removed from the property, but since they could always blow back in on the wind (or, for gall-making wasps or other insects, fly in) in the future, it's not a foolproof method of preventing re-infestation, especially considering the trade-off of the ecological detriment of removing or chopping the leaves. Even if a leaf gall-maker population were to re-emerge in another year, they don't cause any serious damage to the tree and don't need to be managed or controlled.

Miri