# Relationship history for MSHA mine 4608933

Current hierarchy: **Alpha Natural Resources Holdings, Inc → Independence Coal Company Inc → White Oak**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Massey Energy Company → White Oak; 1950-01-01 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → White Oak; 1991-12-01 to 2011-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Omar Mining Company → White Oak; 2001-12-11 to 2002-01-23; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Omar Mining Company; 2001-12-11 to 2002-01-23; source msha-controller-operator-history
- **operator_operates_mine:** Independence Coal Company Inc → White Oak; 2002-01-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Independence Coal Company Inc; 2002-01-24 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → White Oak; 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 2002-01-23; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Independence Coal Company Inc; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → White Oak; 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 2002-01-23; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Independence Coal Company Inc; 2016-07-26 to current/open; source msha-controller-operator-history