| 2007 Bentonite Production and Employment | ||
| Tons | Employees | |
| Colony Area | ||
| Belle/Colony Mine | 1,736,201 | 164 |
| American Colloid | ||
| Colony Mine/Mill | 729,384 | 101 |
| Bentonite Performance Minerals | ||
| Greybull Area | ||
| Greybull Area | 882,808 | 185 |
| M-I SWACO | ||
| Greybull/Stucco | 392,208 | 80 |
| Wyo- Ben | ||
| Kaycee Area | ||
| Kaycee Mine | 548,066 | 17 |
| Black Hills Bentonite Corp. | ||
| Lovell Area | ||
| Lovell Area | 774,368 | 73 |
| Bentonite Performance Minerals | ||
| BCS & MK Mines | 30,000 | 2 |
| Kenneth E. Tanner | ||
| Natrona County | ||
| Poison Spider | 475,780 | 65 |
| Black Hills Bentonite Corp. | ||
| Tensleep Area | ||
| Tensleep Area | 168,337 | 11 |
| Black Hills Bentonite Corp. | ||
| Upton Area | ||
| Upton | 0 | 0 |
| American Colloid | ||