# Relationship history for MSHA mine 4405559

Current hierarchy: **Alpha Natural Resources, Inc. → Mill Branch Coal Corp → Bluff Spur Mine**

- 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:** Westmoreland Coal Company → Bluff Spur Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Westmoreland Coal Company → Bluff Spur Mine; 1979-09-01 to 1996-06-05; source msha-controller-operator-history
- **controller_controls_operator:** Westmoreland Coal Company → Westmoreland Coal Company; 1979-09-01 to 1996-06-05; source msha-controller-operator-history
- **operator_operates_mine:** Callahan Creek Coal Company → Bluff Spur Mine; 1996-06-06 to 1998-06-09; source msha-controller-operator-history
- **controller_controls_mine:** Charles D  Mullins → Bluff Spur Mine; 1996-06-06 to 1998-06-09; source msha-controller-operator-history
- **controller_controls_operator:** Charles D  Mullins → Callahan Creek Coal Company; 1996-06-06 to 1998-06-09; source msha-controller-operator-history
- **controller_controls_mine:** Cumberland Resources Corporation → Bluff Spur Mine; 1996-12-01 to 2010-04-18; source msha-controller-operator-history
- **operator_operates_mine:** Coalfield Mine #1 Inc → Bluff Spur Mine; 1998-06-10 to 2000-03-09; source msha-controller-operator-history
- **controller_controls_mine:** Hagy E  Barnett et al → Bluff Spur Mine; 1998-06-10 to 2000-03-09; source msha-controller-operator-history
- **controller_controls_operator:** Hagy E  Barnett et al → Coalfield Mine #1 Inc; 1998-06-10 to 2000-03-09; source msha-controller-operator-history
- **operator_operates_mine:** Bluff Spur Coal Corporation → Bluff Spur Mine; 2000-03-10 to 2012-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Cumberland Resources Corporation → Bluff Spur Mine; 2000-03-10 to 2010-04-18; source msha-controller-operator-history
- **controller_controls_operator:** Cumberland Resources Corporation → Bluff Spur Coal Corporation; 2000-03-10 to 2010-04-18; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Bluff Spur Mine; 2010-04-19 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Bluff Spur Coal Corporation; 2010-04-19 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Bluff Spur Mine; 2011-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Bluff Spur Coal Corporation; 2011-06-01 to 2012-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Mill Branch Coal Corp → Bluff Spur Mine; 2013-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Mill Branch Coal Corp; 2013-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Mill Branch Coal Corp; 2013-01-01 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Cumberland Resources Corporation → Mill Branch Coal Corp; 2013-01-01 to 2010-04-18; source msha-controller-operator-history