# Relationship history for MSHA mine 5001489

Current hierarchy: **John T  Reid → Western Exploration → Basin Creek/Engstrom**

- 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:** Engstrom Dredging Company → Basin Creek/Engstrom; 1985-08-01 to 2024-01-28; source msha-controller-operator-history
- **controller_controls_mine:** Engstrom Ronald → Basin Creek/Engstrom; 1985-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Engstrom Ronald → Engstrom Dredging Company; 1985-08-01 to 2024-01-28; source msha-controller-operator-history
- **operator_operates_mine:** Western Exploration → Basin Creek/Engstrom; 2024-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John T  Reid → Basin Creek/Engstrom; 2024-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John T  Reid → Western Exploration; 2024-01-29 to current/open; source msha-controller-operator-history