# Relationship history for MSHA mine 2000422

Current hierarchy: **Cleveland-Cliffs Inc → Tilden Mining Company, LC. → Tilden 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

- **operator_operates_mine:** Cleveland-Cliffs Iron Company → Tilden Mine; 1950-01-01 to 1989-08-24; source msha-controller-operator-history
- **controller_controls_mine:** Cleveland-Cliffs Inc → Tilden Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cleveland-Cliffs Inc → Cleveland-Cliffs Iron Company; 1950-01-01 to 1989-08-24; source msha-controller-operator-history
- **operator_operates_mine:** Tilden Mining Company L C → Tilden Mine; 1989-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** U.S. Steel Canada et al → Tilden Mine; 1989-08-25 to 2017-09-28; source msha-controller-operator-history
- **controller_controls_operator:** U.S. Steel Canada et al → Tilden Mining Company L C; 1989-08-25 to 2017-09-28; source msha-controller-operator-history
- **controller_controls_operator:** Cliffs Natural Resources Inc et al → Tilden Mining Company L C; 1989-08-25 to 2017-09-28; source msha-controller-operator-history
- **controller_controls_mine:** Cleveland-Cliffs Inc → Tilden Mine; 2017-09-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cleveland-Cliffs Inc → Tilden Mining Company L C; 2017-09-29 to current/open; source msha-controller-operator-history