I understood you have a different type of mites, my suggestion was that the treatment for spider mites is a good starting point for trying to treat these other mites. We don't have an entry for your mites in our library of information. While you're waiting for someone other than me to come along and offer a more specific suggestion, you might look into using a soapy spray on the trees. You could use this as a reason to give Howard a call on his Sunday morning program.
Infestations of insects often happen when a plant is unhealthy, so you should also look to the health of the oaks that you say have these insects. Are they buried too deep - is the trunk flare adequately exposed? Is the drainage adequate or are they standing in wet areas? Do they get too little water? Any of these can hamper tree growth and health.
A good general approach to healthy trees is the
sick tree treatment.
The final alternative is Mr. Google:
Oak leaf itch mite and
Pyemotes Itch Mite (probably the same results).