# Relationship history for MSHA mine 1600358

Current hierarchy: **Compass Minerals International, Inc. → Compass Minerals Louisiana Inc. → Cote Blanche Mine**

- 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

- **controller_controls_mine:** Domtar Inc → Cote Blanche Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Domtar Industries Inc → Cote Blanche Mine; 1978-03-09 to 1990-11-20; source msha-controller-operator-history
- **controller_controls_operator:** Domtar Inc → Domtar Industries Inc; 1978-03-09 to 1990-11-20; source msha-controller-operator-history
- **controller_controls_mine:** Harris Chemical Group → Cote Blanche Mine; 1988-03-11 to 2001-11-27; source msha-controller-operator-history
- **operator_operates_mine:** North American Salt Company → Cote Blanche Mine; 1990-11-21 to 1998-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Harris Chemical Group → North American Salt Company; 1990-11-21 to 1998-03-31; source msha-controller-operator-history
- **operator_operates_mine:** IMC Salt Inc → Cote Blanche Mine; 1998-04-01 to 2001-11-27; source msha-controller-operator-history
- **controller_controls_mine:** IMC Global Inc → Cote Blanche Mine; 1998-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** IMC Global Inc → IMC Salt Inc; 1998-04-01 to 2001-11-27; source msha-controller-operator-history
- **controller_controls_mine:** Compass Minerals International, Inc. → Cote Blanche Mine; 2001-11-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Compass Minerals International, Inc. → North American Salt Company; 2001-11-28 to 1998-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Compass Minerals America Inc. → Cote Blanche Mine; 2001-11-28 to 2014-10-30; source msha-controller-operator-history
- **controller_controls_operator:** Compass Minerals International, Inc. → Compass Minerals America Inc.; 2001-11-28 to 2014-10-30; source msha-controller-operator-history
- **controller_controls_operator:** Harris Chemical Group → Compass Minerals America Inc.; 2001-11-28 to 2001-11-27; source msha-controller-operator-history
- **operator_operates_mine:** Compass Minerals Louisiana Inc. → Cote Blanche Mine; 2014-10-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Compass Minerals International, Inc. → Cote Blanche Mine; 2014-10-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Compass Minerals International, Inc. → Compass Minerals Louisiana Inc.; 2014-10-31 to current/open; source msha-controller-operator-history