Hm.. that sounds like a lot of mites. Are you sure they are snake mites and not some other sort of bug? If you squish the mites you'll see a bit of blood (from them eating it from the snake) I have heard of the bark beddings having bugs sometimes, but not snake mites usually.

Either way.. to get rid of parasites, the best thing you can get is Provent-a-Mite (you can get it here: http://www.pro-products.com/miteandtemp.html) You spray it on the cage and accessories and it kills mites for 30 days. You don't spray it on the animal though.. but the stuff works great.