“Prions are known to bind to many soil types, and when bound to bentonite clay, infectivity is increased,” Wyoming’s feedground management plan states. “To limit the bioavailability of ...

Bentonite clay deposits in Wyoming make up 70% of the world’s supply, and mines in the Bighorn Basin produced over 50% of Wyoming’s total bentonite production in 2008. Bentonite clay extraction is ...