# Relationship history for MSHA mine 4603141

Current hierarchy: **Lexington Coal Holdings, Inc → Lexington Coal Company, LLC → Chesterfield 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

- **operator_operates_mine:** Omar Mining Company → Chesterfield Prep Plant; 1950-01-01 to 1987-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Chesterfield Prep Plant; 1950-01-01 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Omar Mining Company; 1950-01-01 to 1987-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Central Continental Operating Company Inc → Chesterfield Prep Plant; 1987-10-01 to 1989-07-31; source msha-controller-operator-history
- **controller_controls_mine:** CLI International Enterprises Corp → Chesterfield Prep Plant; 1987-10-01 to 1989-07-31; source msha-controller-operator-history
- **controller_controls_operator:** CLI International Enterprises Corp → Central Continental Operating Company Inc; 1987-10-01 to 1989-07-31; source msha-controller-operator-history
- **operator_operates_mine:** M I M Company Inc → Chesterfield Prep Plant; 1989-08-01 to 1991-05-07; source msha-controller-operator-history
- **controller_controls_mine:** Michael  McClure → Chesterfield Prep Plant; 1989-08-01 to 1991-05-07; source msha-controller-operator-history
- **controller_controls_operator:** Michael  McClure → M I M Company Inc; 1989-08-01 to 1991-05-07; source msha-controller-operator-history
- **operator_operates_mine:** Omar Mining Company → Chesterfield Prep Plant; 1991-05-08 to 2017-10-22; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Omar Mining Company; 1991-05-08 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Chesterfield Prep Plant; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Omar Mining Company; 2011-06-01 to 1987-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Omar Mining Company; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → Chesterfield Prep Plant; 2016-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Omar Mining Company; 2016-07-26 to 1987-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Omar Mining Company; 2016-07-26 to 2017-10-22; source msha-controller-operator-history
- **operator_operates_mine:** Lexington Coal Company, LLC → Chesterfield Prep Plant; 2017-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lexington Coal Holdings, Inc → Chesterfield 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