# Relationship history for MSHA mine 1509546

Current hierarchy: **Douglas  Warriner → DDB Energy Resources, LLC → 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:** Duke Power Company → Prep Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Andalex Resources B V → Prep Plant; 1950-01-01 to 2006-08-08; source msha-controller-operator-history
- **operator_operates_mine:** Eastover Mining Company → Prep Plant; 1976-03-12 to 1983-05-11; source msha-controller-operator-history
- **controller_controls_operator:** Duke Power Company → Eastover Mining Company; 1976-03-12 to 1983-05-11; source msha-controller-operator-history
- **operator_operates_mine:** Little Creek Coal Company → Prep Plant; 1983-05-12 to 1988-07-10; source msha-controller-operator-history
- **controller_controls_mine:** Stanley  Finley et al → Prep Plant; 1983-05-12 to 1988-07-10; source msha-controller-operator-history
- **controller_controls_operator:** Stanley  Finley et al → Little Creek Coal Company; 1983-05-12 to 1988-07-10; source msha-controller-operator-history
- **operator_operates_mine:** Andalex Resources Inc → Prep Plant; 1988-07-11 to 1994-07-19; source msha-controller-operator-history
- **controller_controls_operator:** Andalex Resources B V → Andalex Resources Inc; 1988-07-11 to 1994-07-19; source msha-controller-operator-history
- **controller_controls_mine:** Benjamin R.  Bennett → Prep Plant; 1994-07-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Left Fork Mining Co Inc → Prep Plant; 1994-07-20 to 2016-07-13; source msha-controller-operator-history
- **controller_controls_operator:** Benjamin R.  Bennett → Left Fork Mining Co Inc; 1994-07-20 to 2016-07-13; source msha-controller-operator-history
- **controller_controls_mine:** Robert E  Murray → Prep Plant; 2006-08-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert E  Murray → Andalex Resources Inc; 2006-08-09 to 1994-07-19; source msha-controller-operator-history
- **operator_operates_mine:** DDB Energy Resources, LLC → Prep Plant; 2016-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Douglas  Warriner → Prep Plant; 2016-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas  Warriner → DDB Energy Resources, LLC; 2016-07-14 to current/open; source msha-controller-operator-history