# Relationship history for MSHA mine 4003239

Current hierarchy: **Robert C  Gregory Jr → Dixie Carbon, Inc. → Auger #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:** Dan  Chambers et al → Auger #1; 1983-09-01 to 2013-10-06; source msha-controller-operator-history
- **operator_operates_mine:** Mountainside Coal Company Inc → Auger #1; 2004-07-15 to 2009-01-06; source msha-controller-operator-history
- **controller_controls_operator:** Dan  Chambers et al → Mountainside Coal Company Inc; 2004-07-15 to 2009-01-06; source msha-controller-operator-history
- **controller_controls_mine:** Bert D  Hatmaker → Auger #1; 2007-05-29 to 2013-03-24; source msha-controller-operator-history
- **operator_operates_mine:** Tripple H Coal, LLC → Auger #1; 2009-01-07 to 2016-01-10; source msha-controller-operator-history
- **controller_controls_operator:** Bert D  Hatmaker → Tripple H Coal, LLC; 2009-01-07 to 2013-03-24; source msha-controller-operator-history
- **controller_controls_mine:** William  Yeh → Auger #1; 2013-03-25 to 2015-03-11; source msha-controller-operator-history
- **controller_controls_operator:** William  Yeh → Tripple H Coal, LLC; 2013-03-25 to 2015-03-11; source msha-controller-operator-history
- **controller_controls_mine:** River Energy JV UK Limited → Auger #1; 2013-10-07 to 2021-04-15; source msha-controller-operator-history
- **controller_controls_operator:** River Energy JV UK Limited → Mountainside Coal Company Inc; 2013-10-07 to 2009-01-06; source msha-controller-operator-history
- **controller_controls_mine:** Bert D  Hatmaker → Auger #1; 2015-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bert D  Hatmaker → Tripple H Coal, LLC; 2015-03-12 to 2016-01-10; source msha-controller-operator-history
- **operator_operates_mine:** Dixie Carbon, Inc. → Auger #1; 2016-01-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert C  Gregory Jr → Auger #1; 2016-01-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert C  Gregory Jr → Dixie Carbon, Inc.; 2016-01-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Damian  Caldwell → Auger #1; 2021-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Damian  Caldwell → Mountainside Coal Company Inc; 2021-04-16 to 2009-01-06; source msha-controller-operator-history