# Relationship history for MSHA mine 4606732

Current hierarchy: **Alpha Natural Resources Holdings, Inc → Omar Mining Company → No 15 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:** Massey Energy Company → No 15 Mine; 1950-01-01 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Richard H  Abraham et al → No 15 Mine; 1974-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Omar Mining Company → No 15 Mine; 1983-12-01 to 1984-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Omar Mining Company; 1983-12-01 to 1984-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Expansion Mining Company Inc → No 15 Mine; 1984-06-01 to 1993-08-09; source msha-controller-operator-history
- **controller_controls_operator:** Richard H  Abraham et al → Expansion Mining Company Inc; 1984-06-01 to 1993-08-09; source msha-controller-operator-history
- **operator_operates_mine:** Omar Mining Company → No 15 Mine; 1993-08-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Omar Mining Company; 1993-08-10 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → No 15 Mine; 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 1984-05-31; 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 → No 15 Mine; 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 1984-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Omar Mining Company; 2016-07-26 to current/open; source msha-controller-operator-history