# Relationship history for MSHA mine 1511905

Current hierarchy: **Zeigler Coal Holding Company → Clark Elkhorn Coal Company → Sunset Mine No 1**

- 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:** Coleman Clifford & Ermal B Et Al → Sunset Mine No 1; 1976-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard E  Salyer et al → Sunset Mine No 1; 1976-11-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** A M Coal Company Inc → Sunset Mine No 1; 1979-05-01 to 1980-09-14; source msha-controller-operator-history
- **controller_controls_mine:** Schwab Charles F → Sunset Mine No 1; 1979-05-01 to 1980-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Schwab Charles F → A M Coal Company Inc; 1979-05-01 to 1980-09-14; source msha-controller-operator-history
- **operator_operates_mine:** Oak Ridge Coal Company Inc → Sunset Mine No 1; 1980-09-15 to 1981-09-17; source msha-controller-operator-history
- **controller_controls_operator:** Coleman Clifford & Ermal B Et Al → Oak Ridge Coal Company Inc; 1980-09-15 to 1981-09-17; source msha-controller-operator-history
- **operator_operates_mine:** Art-Mac Coal Company Inc → Sunset Mine No 1; 1981-09-18 to 1983-06-23; source msha-controller-operator-history
- **controller_controls_mine:** Spears Artemus → Sunset Mine No 1; 1981-09-18 to 1983-06-23; source msha-controller-operator-history
- **controller_controls_operator:** Spears Artemus → Art-Mac Coal Company Inc; 1981-09-18 to 1983-06-23; source msha-controller-operator-history
- **operator_operates_mine:** W C S Inc → Sunset Mine No 1; 1983-06-24 to 1983-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Earley William G → Sunset Mine No 1; 1983-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Earley William G → W C S Inc; 1983-06-24 to 1983-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Sunset Coal Company Inc → Sunset Mine No 1; 1983-11-16 to 1983-12-14; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Sunset Mine No 1; 1983-11-16 to 1984-05-23; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Sunset Coal Company Inc; 1983-11-16 to 1983-12-14; source msha-controller-operator-history
- **operator_operates_mine:** Inferno Coals Inc → Sunset Mine No 1; 1983-12-15 to 1988-01-10; source msha-controller-operator-history
- **controller_controls_operator:** Richard E  Salyer et al → Inferno Coals Inc; 1983-12-15 to 1988-01-10; source msha-controller-operator-history
- **operator_operates_mine:** Sunset Coal Company → Sunset Mine No 1; 1988-01-11 to 1992-11-22; source msha-controller-operator-history
- **controller_controls_mine:** Shell Oil Company → Sunset Mine No 1; 1988-01-11 to 1992-11-22; source msha-controller-operator-history
- **controller_controls_operator:** Shell Oil Company → Sunset Coal Company; 1988-01-11 to 1992-11-22; source msha-controller-operator-history
- **operator_operates_mine:** Clark Elkhorn Coal Company → Sunset Mine No 1; 1992-11-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Zeigler Coal Holding Company → Sunset Mine No 1; 1992-11-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zeigler Coal Holding Company → Clark Elkhorn Coal Company; 1992-11-23 to current/open; source msha-controller-operator-history