# Relationship history for MSHA mine 4000269

Current hierarchy: **Campbell Donald → Dakota Coal Corp → Horse Creek 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Horse Creek Coal Company → Horse Creek Mine; 1950-01-01 to 1994-10-30; source msha-controller-operator-history
- **controller_controls_mine:** Campbell Donald Et Al → Horse Creek Mine; 1950-01-01 to 1994-10-30; source msha-controller-operator-history
- **controller_controls_operator:** Campbell Donald Et Al → Horse Creek Coal Company; 1950-01-01 to 1994-10-30; source msha-controller-operator-history
- **operator_operates_mine:** Samoth Inc → Horse Creek Mine; 1994-10-31 to 1996-01-01; source msha-controller-operator-history
- **controller_controls_mine:** Thomas Tommy → Horse Creek Mine; 1994-10-31 to 1996-01-01; source msha-controller-operator-history
- **controller_controls_operator:** Thomas Tommy → Samoth Inc; 1994-10-31 to 1996-01-01; source msha-controller-operator-history
- **operator_operates_mine:** Dakota Coal Corp → Horse Creek Mine; 1996-01-02 to 1997-05-06; source msha-controller-operator-history
- **controller_controls_mine:** Campbell Donald Et Al → Horse Creek Mine; 1996-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Campbell Donald Et Al → Dakota Coal Corp; 1996-01-02 to 1997-05-06; source msha-controller-operator-history
- **operator_operates_mine:** Indigo Coal Company → Horse Creek Mine; 1997-05-07 to 1998-01-30; source msha-controller-operator-history
- **controller_controls_mine:** Thomas Tommy → Horse Creek Mine; 1997-05-07 to 1998-01-30; source msha-controller-operator-history
- **controller_controls_operator:** Thomas Tommy → Indigo Coal Company; 1997-05-07 to 1998-01-30; source msha-controller-operator-history
- **operator_operates_mine:** Dakota Coal Corp → Horse Creek Mine; 1998-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Campbell Donald Et Al → Dakota Coal Corp; 1998-01-31 to current/open; source msha-controller-operator-history