# Relationship history for MSHA mine 4001586

Current hierarchy: **Meeks Alfred Jr & Billy Joe Kilgore → K & M Coal Company → No 28 Mine**

- 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:** Tennessee Consolidated Coal Company Inc → No 28 Mine; 1950-01-01 to 1976-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Grundy Mining Company Inc → No 28 Mine; 1974-01-01 to 1976-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Tennessee Consolidated Coal Company Inc → Grundy Mining Company Inc; 1974-01-01 to 1976-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Tennessee Consolidated Coal Company → No 28 Mine; 1976-09-01 to 1985-08-20; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → No 28 Mine; 1976-09-01 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Tennessee Consolidated Coal Company; 1976-09-01 to 1985-08-20; source msha-controller-operator-history
- **operator_operates_mine:** K & M Coal Company → No 28 Mine; 1985-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Meeks Alfred Jr & Billy Joe Kilgore → No 28 Mine; 1985-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Meeks Alfred Jr & Billy Joe Kilgore → K & M Coal Company; 1985-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → No 28 Mine; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Tennessee Consolidated Coal Company; 2011-06-01 to 1985-08-20; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → No 28 Mine; 2016-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Tennessee Consolidated Coal Company; 2016-07-26 to 1985-08-20; source msha-controller-operator-history