# Relationship history for MSHA mine 4407127

Current hierarchy: **Alpha Natural Resources, Inc. → Mill Branch Coal Corp → Derby Wilson 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:** Paul R  Ison  et al → Derby Wilson Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cumberland Resources Corporation → Derby Wilson Mine; 1993-03-01 to 2010-04-18; source msha-controller-operator-history
- **controller_controls_mine:** Cumberland Resources Corporation → Derby Wilson Mine; 1996-12-01 to 2010-04-18; source msha-controller-operator-history
- **operator_operates_mine:** Ambrose Branch Coal Co Inc → Derby Wilson Mine; 2005-02-28 to 2005-08-08; source msha-controller-operator-history
- **controller_controls_operator:** Paul R  Ison  et al → Ambrose Branch Coal Co Inc; 2005-02-28 to 2005-08-08; source msha-controller-operator-history
- **controller_controls_operator:** Jessica B  Ison  et al → Ambrose Branch Coal Co Inc; 2005-02-28 to 2005-08-08; source msha-controller-operator-history
- **operator_operates_mine:** North Star Energy, Inc. → Derby Wilson Mine; 2005-08-09 to 2009-06-02; source msha-controller-operator-history
- **controller_controls_mine:** Bradley V  Hurley → Derby Wilson Mine; 2005-08-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bradley V  Hurley → North Star Energy, Inc.; 2005-08-09 to 2009-06-02; source msha-controller-operator-history
- **operator_operates_mine:** Guest Mountain Mining Corporation → Derby Wilson Mine; 2009-06-03 to 2012-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Cumberland Resources Corporation → Guest Mountain Mining Corporation; 2009-06-03 to 2010-04-18; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Derby Wilson Mine; 2010-04-19 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Guest Mountain Mining Corporation; 2010-04-19 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Derby Wilson Mine; 2011-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Guest Mountain Mining Corporation; 2011-06-01 to 2012-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Mill Branch Coal Corp → Derby Wilson 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