# Relationship history for MSHA mine 4607837

Current hierarchy: **Arch Resources Inc → Vindex Energy LLC → Dobbin Ridge Prep Plant**

- 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:** Carl Del Signore Family Trust → Dobbin Ridge Prep Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Buffalo Coal Company Inc → Dobbin Ridge Prep Plant; 1990-02-01 to 2001-03-29; source msha-controller-operator-history
- **controller_controls_operator:** Carl Del Signore Family Trust → Buffalo Coal Company Inc; 1990-02-01 to 2001-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Anker Group Inc → Dobbin Ridge Prep Plant; 1997-02-10 to 2005-11-17; source msha-controller-operator-history
- **operator_operates_mine:** Buffalo Coal Company Inc → Dobbin Ridge Prep Plant; 2001-03-30 to 2006-08-29; source msha-controller-operator-history
- **controller_controls_mine:** Gerald W  Ramsburg  et al → Dobbin Ridge Prep Plant; 2001-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gerald W  Ramsburg  et al → Buffalo Coal Company Inc; 2001-03-30 to 2006-08-29; source msha-controller-operator-history
- **controller_controls_operator:** Charles R  Howdershelt  et al → Buffalo Coal Company Inc; 2001-03-30 to 2006-08-29; source msha-controller-operator-history
- **controller_controls_mine:** International Coal Group Inc (ICG) → Dobbin Ridge Prep Plant; 2005-11-18 to 2011-06-14; source msha-controller-operator-history
- **operator_operates_mine:** Vindex Energy Corporation → Dobbin Ridge Prep Plant; 2006-08-30 to 2014-12-09; source msha-controller-operator-history
- **controller_controls_operator:** International Coal Group Inc (ICG) → Vindex Energy Corporation; 2006-08-30 to 2011-06-14; source msha-controller-operator-history
- **controller_controls_operator:** Anker Group Inc → Vindex Energy Corporation; 2006-08-30 to 2005-11-17; source msha-controller-operator-history
- **controller_controls_mine:** Arch Resources Inc → Dobbin Ridge Prep Plant; 2011-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arch Resources Inc → Vindex Energy Corporation; 2011-06-15 to 2014-12-09; source msha-controller-operator-history
- **operator_operates_mine:** Taylor Minerals, Inc. → Dobbin Ridge Prep Plant; 2014-12-10 to 2015-10-25; source msha-controller-operator-history
- **controller_controls_mine:** Freddie A  Taylor → Dobbin Ridge Prep Plant; 2014-12-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Freddie A  Taylor → Taylor Minerals, Inc.; 2014-12-16 to 2015-10-25; source msha-controller-operator-history
- **operator_operates_mine:** Vindex Energy LLC → Dobbin Ridge Prep Plant; 2015-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** International Coal Group Inc (ICG) → Vindex Energy LLC; 2015-10-26 to 2011-06-14; source msha-controller-operator-history
- **controller_controls_operator:** Anker Group Inc → Vindex Energy LLC; 2015-10-26 to 2005-11-17; source msha-controller-operator-history
- **controller_controls_operator:** Arch Resources Inc → Vindex Energy LLC; 2015-10-26 to current/open; source msha-controller-operator-history