Here are a few photos of Black Hills Bentonite plant sites throughout Wyoming.
Black Hills Bentonite Thornton Plant, Upton, Wyoming.
Black Hills Bentonite Harry Thorson Plant, Mills, Wyoming.
Black Hills Bentonite, Casper, Wyoming Plant
Black Hills Bentonite, Mills, Wyoming Plant.
Black Hills Bentonite, Worland, Wyoming Plant.
Black Hills Lignite (Leonardite) Plant, Glenrock, Wyoming.