| Lat / long: | 43.62773, -109.37795 |
| Primary: | Clay |
| Operation type: | Unknown |
| Development status: | Occurrence |
| MAS | 560131190 |
| DEP | 10229964 |
| Reference | {Deposit:: 1 MILE NE DUNCAN POST OFFICE BENTONITE 5-10 FT THICK}{Deposit:: WYO GEOL SURV BULL 50 1966 P 16} |
| Reporter | South Dakota School of Mines and Technology HJB |