Those definitely sound like springtails then and would be harmless to your ball python. They seem to like really damp environments and decaying wood substrate.
For real mites you'd want to get provent-a-mite and spray down your tank and completely clean and or trash all of your furniture and scrub the whole tank down. You can find provent-a-mite here or at reptile shows.
http://pro-products.com/provent-a-mite/
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