# Relationship history for MSHA mine 4406746

Current hierarchy: **Darrell  Grigsby → Maven Energy, LLC → Prep Plant #1**

- 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 → Prep Plant #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas V  Cooper → Prep Plant #1; 1979-04-01 to 2001-07-24; source msha-controller-operator-history
- **controller_controls_mine:** Jerry W  Wharton → Prep Plant #1; 1990-09-01 to 2009-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Andover Enterprises Inc → Prep Plant #1; 1993-08-01 to 2000-08-01; source msha-controller-operator-history
- **controller_controls_operator:** Thomas V  Cooper → Andover Enterprises Inc; 1993-08-01 to 2000-08-01; source msha-controller-operator-history
- **operator_operates_mine:** Ambrose Branch Coal Company Inc → Prep Plant #1; 2000-08-02 to 2006-07-12; source msha-controller-operator-history
- **controller_controls_operator:** Paul R  Ison  et al → Ambrose Branch Coal Company Inc; 2000-08-02 to 2006-07-12; source msha-controller-operator-history
- **controller_controls_operator:** Jessica B  Ison  et al → Ambrose Branch Coal Company Inc; 2000-08-02 to 2006-07-12; source msha-controller-operator-history
- **operator_operates_mine:** A & G Coal Corporation → Prep Plant #1; 2006-07-13 to 2016-07-26; source msha-controller-operator-history
- **controller_controls_operator:** Jerry W  Wharton → A & G Coal Corporation; 2006-07-13 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** James C  Justice II et al → Prep Plant #1; 2009-04-30 to 2017-03-26; source msha-controller-operator-history
- **controller_controls_operator:** James C  Justice II et al → A & G Coal Corporation; 2009-04-30 to 2016-07-26; source msha-controller-operator-history
- **operator_operates_mine:** Maven Energy, LLC → Prep Plant #1; 2016-07-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Darrell  Grigsby → Prep Plant #1; 2016-07-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darrell  Grigsby → Maven Energy, LLC; 2016-07-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jillean L  Justice et al → Prep Plant #1; 2017-03-27 to 2022-10-02; source msha-controller-operator-history
- **controller_controls_operator:** Jillean L  Justice et al → A & G Coal Corporation; 2017-03-27 to 2016-07-26; source msha-controller-operator-history
- **controller_controls_operator:** James C  Justice lll et al → A & G Coal Corporation; 2017-03-27 to 2016-07-26; source msha-controller-operator-history
- **controller_controls_mine:** James C  Justice III → Prep Plant #1; 2022-10-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James C  Justice III → A & G Coal Corporation; 2022-10-03 to 2016-07-26; source msha-controller-operator-history