# Relationship history for MSHA mine 2102449

Current hierarchy: **Cleveland-Cliffs Inc → Cleveland-Cliffs Minorca Mine Inc. → Minorca 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:** Inland Steel Mining Company → Minorca Mine; 1950-01-01 to 1998-07-15; source msha-controller-operator-history
- **controller_controls_mine:** Inland Steel Industries Inc → Minorca Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Inland Steel Industries Inc → Inland Steel Mining Company; 1950-01-01 to 1998-07-15; source msha-controller-operator-history
- **operator_operates_mine:** Cleveland-Cliffs Minorca Mine Inc. → Minorca Mine; 1998-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** ArcelorMittal USA LLC → Minorca Mine; 1998-07-16 to 2020-12-08; source msha-controller-operator-history
- **controller_controls_operator:** ArcelorMittal USA LLC → Cleveland-Cliffs Minorca Mine Inc.; 1998-07-16 to 2020-12-08; source msha-controller-operator-history
- **controller_controls_mine:** Cleveland-Cliffs Inc → Minorca Mine; 2020-12-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cleveland-Cliffs Inc → Cleveland-Cliffs Minorca Mine Inc.; 2020-12-09 to current/open; source msha-controller-operator-history