# Relationship history for MSHA mine 4201755

Current hierarchy: **Barrick Gold Corp → Barrick Resources (Usa) Inc → BARRICK MERCUR GOLD 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

- **controller_controls_mine:** Texaco Inc → BARRICK MERCUR GOLD MINE; 1981-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Getty Mining Company → BARRICK MERCUR GOLD MINE; 1981-09-01 to 1985-07-16; source msha-controller-operator-history
- **controller_controls_operator:** Texaco Inc → Getty Mining Company; 1981-09-01 to 1985-07-16; source msha-controller-operator-history
- **operator_operates_mine:** Barrick Resources (Usa) Inc → BARRICK MERCUR GOLD MINE; 1985-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barrick Gold Corp → BARRICK MERCUR GOLD MINE; 1985-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barrick Gold Corp → Barrick Resources (Usa) Inc; 1985-07-17 to current/open; source msha-controller-operator-history