| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Cornish Brick Co Ltd | 02401759 | 07/04/1993 | Dissolved |
| FUCHS ARCHIVES LTD | 03120656 | 30/01/1996 | Dissolved |
| Payne-Crete Ltd | 00992847 | 13/10/1991 | Dissolved |
| Pentewan Brick Co Ltd | 02401762 | 07/04/1993 | Dissolved |
| Shepherds Minerals Ltd | 01718645 | 07/04/1993 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| Abrahams,Ken,(Concrete) Ltd | 01362028 | 07/04/1993 | 16/10/1995 | Dissolved |
| Bothel Limestone & Brick Co Ltd | 02153710 | 13/10/1991 | 01/08/1995 | Dissolved |
| CAST LIMITED | 02391989 | 05/06/1991 | 30/11/1992 | Gold |
| CAST RESOURCES LIMITED | 02392077 | 05/06/1991 | 30/05/1995 | Dissolved |
| Cast Holdings Ltd | 00194342 | 28/11/1991 | 30/05/1995 | Dissolved |
| HARGREAVES QUARRIES LIMITED | 02412670 | 10/08/1992 | 01/10/1995 | Dissolved |
| INSTITUTE OF QUARRYING(THE) | 00606601 | 31/10/1991 | 05/10/2006 | One Red Flag |
| MINERAL PRODUCTS ASSOCIATION LIMITED | 01634996 | 31/08/1991 | 31/08/1995 | Silver |
| NATIONAL STONE CENTRE(THE) | 01817304 | 15/03/1996 | 30/09/1999 | Bronze |
| PENRYN GRANITE LIMITED | 01017286 | 24/08/1991 | 16/10/1995 | Dissolved |
| SEVEN LOCKS HOUSING LIMITED | 05571472 | 31/10/2007 | 13/07/2011 | Dissolved |
| SOUTH WEST AGGREGATES LIMITED | 01685497 | 07/04/1993 | 19/07/1993 | Dissolved |
| THE QMJ GROUP LIMITED | 00198656 | 12/05/1994 | 05/08/1999 | Bronze |