# Relationship history for MSHA mine 4608753

Current hierarchy: **Alpha Natural Resources Holdings, Inc → Kingwood Mining Company LLC → Whitetail Preparation Facility**

- 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:** El Paso Energy Corp → Whitetail Preparation Facility; 1979-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Coastal Coal-West Virginia Llc → Whitetail Preparation Facility; 1999-01-01 to 2003-01-31; source msha-controller-operator-history
- **controller_controls_operator:** El Paso Energy Corp → Coastal Coal-West Virginia Llc; 1999-01-01 to 2003-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Kingwood Mining Company LLC → Whitetail Preparation Facility; 2003-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Whitetail Preparation Facility; 2003-02-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Kingwood Mining Company LLC; 2003-02-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → Whitetail Preparation Facility; 2016-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Kingwood Mining Company LLC; 2016-07-26 to current/open; source msha-controller-operator-history