# Relationship history for MSHA mine 1508977

Current hierarchy: **El Paso Energy Corp → Coastal Coal Company, LLC → Black Thunder Mine No. 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:** Harry  LaViers Jr → Black Thunder Mine No. 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** South-East Coal Company Inc → Black Thunder Mine No. 1; 1975-10-29 to 1993-03-28; source msha-controller-operator-history
- **controller_controls_operator:** Harry  LaViers Jr → South-East Coal Company Inc; 1975-10-29 to 1993-03-28; source msha-controller-operator-history
- **controller_controls_mine:** El Paso Energy Corp → Black Thunder Mine No. 1; 1989-04-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dlx Inc → Black Thunder Mine No. 1; 1993-03-29 to 1994-08-18; source msha-controller-operator-history
- **controller_controls_mine:** Donald G  LaViers → Black Thunder Mine No. 1; 1993-03-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald G  LaViers → Dlx Inc; 1993-03-29 to 1994-08-18; source msha-controller-operator-history
- **operator_operates_mine:** Fox Mining Corp → Black Thunder Mine No. 1; 1994-08-19 to 1998-12-10; source msha-controller-operator-history
- **controller_controls_mine:** Charles E  Yates → Black Thunder Mine No. 1; 1994-08-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles E  Yates → Fox Mining Corp; 1994-08-19 to 1998-12-10; source msha-controller-operator-history
- **operator_operates_mine:** Coastal Coal Company, LLC → Black Thunder Mine No. 1; 1998-12-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** El Paso Energy Corp → Coastal Coal Company, LLC; 1998-12-11 to current/open; source msha-controller-operator-history