Here are a few photos of Black Hills Bentonite plant sites throughout Wyoming.

 

Thornton Plant

Black Hills Bentonite Thornton Plant, Upton, Wyoming.
Thornson Plant
Black Hills Bentonite Harry Thorson Plant, Mills, Wyoming.

Casper Plant

Black Hills Bentonite, Casper, Wyoming Plant
Mills Plant
Black Hills Bentonite, Mills, Wyoming Plant.
Worland Plant
Black Hills Bentonite, Worland, Wyoming Plant.
Black Hills Lignite (Leonardite) Plant, Glenrock, Wyoming. Worland Plant
Black Hills Lignite (Leonardite) Plant, Glenrock, Wyoming.