# Relationship history for MSHA mine 4607187

Current hierarchy: **Golf Terry → Unicoal Inc → Peerless Eagle Contract Mine No 9**

- 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 → Peerless Eagle Contract Mine No 9; 1975-09-01 to 2011-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Peerless Eagle Coal Company → Peerless Eagle Contract Mine No 9; 1986-09-01 to 1986-10-21; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Peerless Eagle Coal Company; 1986-09-01 to 1986-10-21; source msha-controller-operator-history
- **operator_operates_mine:** Unicoal Inc → Peerless Eagle Contract Mine No 9; 1986-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Golf Terry → Peerless Eagle Contract Mine No 9; 1986-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Golf Terry → Unicoal Inc; 1986-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Peerless Eagle Contract Mine No 9; 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 1986-10-21; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → Peerless Eagle Contract Mine No 9; 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 1986-10-21; source msha-controller-operator-history