# Relationship history for MSHA mine 1511620

Current hierarchy: **Centennial Coal Inc → Centennial Resources Inc → McHenry Complex**

- 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:** Horizon Natural Resources Incorporated → McHenry Complex; 1978-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pyramid Mining Inc → McHenry Complex; 1978-10-01 to 1983-02-22; source msha-controller-operator-history
- **controller_controls_operator:** Horizon Natural Resources Incorporated → Pyramid Mining Inc; 1978-10-01 to 1983-02-22; source msha-controller-operator-history
- **operator_operates_mine:** Pyramid Mining Inc → McHenry Complex; 1983-02-23 to 1993-10-14; source msha-controller-operator-history
- **controller_controls_mine:** First Mississippi Corp → McHenry Complex; 1983-02-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** First Mississippi Corp → Pyramid Mining Inc; 1983-02-23 to 1993-10-14; source msha-controller-operator-history
- **operator_operates_mine:** Mesa Coals Inc → McHenry Complex; 1993-10-15 to 1994-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Thunderbird Energy Inc → McHenry Complex; 1993-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thunderbird Energy Inc → Mesa Coals Inc; 1993-10-15 to 1994-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Bill  Carver → McHenry Complex; 1993-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Progressive Mining Inc → McHenry Complex; 1994-04-01 to 1994-08-21; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Carver → Progressive Mining Inc; 1994-04-01 to 1994-08-21; source msha-controller-operator-history
- **operator_operates_mine:** Mesa Coals Inc → McHenry Complex; 1994-08-22 to 1996-11-25; source msha-controller-operator-history
- **controller_controls_operator:** Thunderbird Energy Inc → Mesa Coals Inc; 1994-08-22 to 1996-11-25; source msha-controller-operator-history
- **operator_operates_mine:** Mesa Coals Inc → McHenry Complex; 1996-11-26 to 1997-03-15; source msha-controller-operator-history
- **controller_controls_mine:** Romero Richard → McHenry Complex; 1996-11-26 to 1997-03-29; source msha-controller-operator-history
- **controller_controls_operator:** Romero Richard → Mesa Coals Inc; 1996-11-26 to 1997-03-15; source msha-controller-operator-history
- **controller_controls_mine:** Centennial Coal Inc → McHenry Complex; 1997-03-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Centennial Resources Inc → McHenry Complex; 1997-03-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Centennial Coal Inc → Centennial Resources Inc; 1997-03-16 to current/open; source msha-controller-operator-history