# Relationship history for MSHA mine 4607985

Current hierarchy: **Lexington Coal Holdings, Inc → LEXINGTON COAL COMPANY LLC → BLACK BEAR PREPARATION 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:** Ashland Inc et al → BLACK BEAR PREPARATION PLANT; 1990-01-24 to 1996-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Mingo Logan Coal Company → BLACK BEAR PREPARATION PLANT; 1990-12-01 to 2007-06-29; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc et al → Mingo Logan Coal Company; 1990-12-01 to 1996-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Arch Resources Inc → BLACK BEAR PREPARATION PLANT; 1997-07-01 to 2025-01-13; source msha-controller-operator-history
- **controller_controls_operator:** Arch Resources Inc → Mingo Logan Coal Company; 1997-07-01 to 2007-06-29; source msha-controller-operator-history
- **operator_operates_mine:** Brooks Run South Mining, LLC → BLACK BEAR PREPARATION PLANT; 2007-06-30 to 2017-10-22; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → BLACK BEAR PREPARATION PLANT; 2007-06-30 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Brooks Run South Mining, LLC; 2007-06-30 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → BLACK BEAR PREPARATION PLANT; 2016-07-26 to 2018-11-08; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Brooks Run South Mining, LLC; 2016-07-26 to 2017-10-22; source msha-controller-operator-history
- **operator_operates_mine:** Lexington Coal Company LLC → BLACK BEAR PREPARATION PLANT; 2017-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lexington Coal Holdings, Inc → BLACK BEAR PREPARATION 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
- **controller_controls_mine:** Alpha Metallurgical Resources Inc → BLACK BEAR PREPARATION PLANT; 2018-11-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Metallurgical Resources Inc → Brooks Run South Mining, LLC; 2018-11-09 to 2017-10-22; source msha-controller-operator-history
- **controller_controls_mine:** Core Natural Resources Inc → BLACK BEAR PREPARATION PLANT; 2025-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Core Natural Resources Inc → Mingo Logan Coal Company; 2025-01-14 to 2007-06-29; source msha-controller-operator-history