| Relationships | Role | Relationship Start | Relationship End |
| Imerys Usa, Inc. | Parent | 12/31/1993 | 8/31/2001 |
| American Minerals, Inc. | Subsidary | 1/30/1998 | 8/31/2001 |
| Premier Refractories International, Inc. | Subsidary | 1/30/1998 | 12/31/1999 |
| American Premier Holdings, Inc. | Subsidary | 12/31/1994 | 1/30/1998 |
| American Premier Holdings, Inc. | Subsidary | 12/31/1993 | 12/30/1994 |