# Relationship history for MSHA mine 2401147

Current hierarchy: **Asarco Inc → Asarco Inc → Black Pine 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:** Asarco Inc → Black Pine Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Black Pine Mining Company → Black Pine Mine; 1950-01-01 to 1990-06-26; source msha-controller-operator-history
- **controller_controls_mine:** Terra Industries Inc → Black Pine Mine; 1950-01-01 to 1990-06-26; source msha-controller-operator-history
- **controller_controls_operator:** Terra Industries Inc → Black Pine Mining Company; 1950-01-01 to 1990-06-26; source msha-controller-operator-history
- **operator_operates_mine:** Asarco Inc → Black Pine Mine; 1990-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Asarco Inc → Asarco Inc; 1990-06-27 to current/open; source msha-controller-operator-history