# Relationship history for MSHA mine 4607950

Current hierarchy: **Lexington Coal Holdings, Inc → LEXINGTON COAL COMPANY, LLC → PREP PLANT**

- 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:** Shell Oil Company → PREP PLANT; 1987-07-10 to 1992-11-23; source msha-controller-operator-history
- **operator_operates_mine:** Kermit Coal Company → PREP PLANT; 1990-10-01 to 1992-11-23; source msha-controller-operator-history
- **controller_controls_operator:** Shell Oil Company → Kermit Coal Company; 1990-10-01 to 1992-11-23; source msha-controller-operator-history
- **operator_operates_mine:** Kermit Coal Company → PREP PLANT; 1992-11-24 to 2005-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Zeigler Coal Holding Company → PREP PLANT; 1992-11-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zeigler Coal Holding Company → Kermit Coal Company; 1992-11-24 to 2005-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → PREP PLANT; 2000-01-12 to 2011-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Greyeagle Coal Company → PREP PLANT; 2005-06-30 to 2017-10-22; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Greyeagle Coal Company; 2005-06-30 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → PREP PLANT; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Greyeagle Coal Company; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → PREP PLANT; 2016-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Greyeagle Coal Company; 2016-07-26 to 2017-10-22; source msha-controller-operator-history
- **operator_operates_mine:** Lexington Coal Company, LLC → PREP PLANT; 2017-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lexington Coal Holdings, Inc → PREP PLANT; 2017-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lexington Coal Holdings, Inc → Lexington Coal Company, LLC; 2017-10-23 to current/open; source msha-controller-operator-history