# Relationship history for MSHA mine 1515648

Current hierarchy: **Horizon Natural Resources Incorporated → Clark Elkhorn Coal Company → Cedar Creek No 5 Surface**

- 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:** Massey Energy Company → Cedar Creek No 5 Surface; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Clark Elkhorn Coal Company Inc → Cedar Creek No 5 Surface; 1986-06-01 to 1987-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Clark Elkhorn Coal Company Inc; 1986-06-01 to 1987-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Clark Elkhorn Coal Company → Cedar Creek No 5 Surface; 1987-07-10 to 1992-11-22; source msha-controller-operator-history
- **controller_controls_mine:** Shell Oil Company → Cedar Creek No 5 Surface; 1987-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shell Oil Company → Clark Elkhorn Coal Company; 1987-07-10 to 1992-11-22; source msha-controller-operator-history
- **operator_operates_mine:** Clark Elkhorn Coal Company → Cedar Creek No 5 Surface; 1992-11-23 to 1998-09-01; source msha-controller-operator-history
- **controller_controls_mine:** Zeigler Coal Holding Company → Cedar Creek No 5 Surface; 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 1998-09-01; source msha-controller-operator-history
- **operator_operates_mine:** Clark Elkhorn Coal Company → Cedar Creek No 5 Surface; 1998-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Horizon Natural Resources Incorporated → Cedar Creek No 5 Surface; 1998-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horizon Natural Resources Incorporated → Clark Elkhorn Coal Company; 1998-09-02 to current/open; source msha-controller-operator-history