# Relationship history for MSHA mine 4606532

Current hierarchy: **Alpha Natural Resources Holdings, Inc → Trace Creek Coal Company → Twin Branch Load Out**

- 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:** Occidental Petroleum Corp → Twin Branch Load Out; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Island Creek Coal Company → Twin Branch Load Out; 1982-05-01 to 1986-07-28; source msha-controller-operator-history
- **controller_controls_operator:** Occidental Petroleum Corp → Island Creek Coal Company; 1982-05-01 to 1986-07-28; source msha-controller-operator-history
- **controller_controls_mine:** Dehart Virgil Et Al → Twin Branch Load Out; 1984-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Magnet Coal Inc → Twin Branch Load Out; 1986-07-29 to 1987-06-18; source msha-controller-operator-history
- **controller_controls_operator:** Dehart Virgil Et Al → Magnet Coal Inc; 1986-07-29 to 1987-06-18; source msha-controller-operator-history
- **operator_operates_mine:** Laurel Run Mining Company → Twin Branch Load Out; 1987-06-19 to 1993-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Occidental Petroleum Corp → Laurel Run Mining Company; 1987-06-19 to 1993-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Laurel Run Mining Company → Twin Branch Load Out; 1993-07-01 to 1998-11-06; source msha-controller-operator-history
- **controller_controls_mine:** CONSOL Energy Inc → Twin Branch Load Out; 1993-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CONSOL Energy Inc → Laurel Run Mining Company; 1993-07-01 to 1998-11-06; source msha-controller-operator-history
- **operator_operates_mine:** Trace Creek Coal Company → Twin Branch Load Out; 1998-11-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Twin Branch Load Out; 1998-11-07 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Trace Creek Coal Company; 1998-11-07 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Twin Branch Load Out; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Trace Creek Coal Company; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → Twin Branch Load Out; 2016-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Trace Creek Coal Company; 2016-07-26 to current/open; source msha-controller-operator-history