You can read more about it here, and it's from a university website, so it seems credible:
http://anrcatalog.ucanr.edu/pdf/8162.pdf
It recommends pyrethrins or carbaryl (sevin dust).
Some people have used frontline on their chickens and had success with ridding them of parasites, but that's really much riskier for your health if you're eating the eggs, IMO. Permethrin dust has had studies done on it before it was approved for use around gardens and chickens. Frontline and...
Check out this site for info on mites and lice and how to treat them:
http://www.the-chicken-chick.com/2012/08/poultry-lice-and-mites-identification.html
I haven't dealt with mites before, but I have treated mine for lice, using Garden and Poultry Dust with permethrin. My husband and I would...