# Relationship history for MSHA mine 4607909

Current hierarchy: **Alpha Natural Resources Holdings, Inc → Peerless Eagle Coal Company → Enoch Branch No 1 Strip**

- 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 → Enoch Branch No 1 Strip; 1975-09-01 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Maplewood Mining Company Inc → Enoch Branch No 1 Strip; 1988-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** U S Construction Company Inc → Enoch Branch No 1 Strip; 1990-07-01 to 1992-07-21; source msha-controller-operator-history
- **controller_controls_operator:** Maplewood Mining Company Inc → U S Construction Company Inc; 1990-07-01 to 1992-07-21; source msha-controller-operator-history
- **operator_operates_mine:** Peerless Eagle Coal Company → Enoch Branch No 1 Strip; 1992-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Peerless Eagle Coal Company; 1992-07-22 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Enoch Branch No 1 Strip; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Peerless Eagle Coal Company; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → Enoch Branch No 1 Strip; 2016-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Peerless Eagle Coal Company; 2016-07-26 to current/open; source msha-controller-operator-history