# Relationship history for MSHA mine 1400309

Current hierarchy: **Koch Industries Inc → GP Industrial Plasters LLC → Blue Rapids Mine and Mill**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Georgia-Pacific → Blue Rapids Mine and Mill; 1950-01-01 to 2006-12-30; source msha-controller-operator-history
- **controller_controls_mine:** Georgia Pacific Corp → Blue Rapids Mine and Mill; 1950-01-01 to 2005-12-22; source msha-controller-operator-history
- **controller_controls_operator:** Georgia Pacific Corp → Georgia-Pacific; 1950-01-01 to 2005-12-22; source msha-controller-operator-history
- **controller_controls_mine:** Koch Industries Inc → Blue Rapids Mine and Mill; 2005-12-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Koch Industries Inc → Georgia-Pacific; 2005-12-23 to 2006-12-30; source msha-controller-operator-history
- **operator_operates_mine:** Georgia-Pacific Gypsum LLC → Blue Rapids Mine and Mill; 2006-12-31 to 2017-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Koch Industries Inc → Blue Rapids Mine and Mill; 2006-12-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Koch Industries Inc → Georgia-Pacific Gypsum LLC; 2006-12-31 to 2017-07-31; source msha-controller-operator-history
- **operator_operates_mine:** GP Industrial Plasters LLC → Blue Rapids Mine and Mill; 2017-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Koch Industries Inc → Blue Rapids Mine and Mill; 2017-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Koch Industries Inc → GP Industrial Plasters LLC; 2017-08-01 to current/open; source msha-controller-operator-history