# Relationship history for MSHA mine 1517408

Current hierarchy: **El Paso Energy Corp → Coastal Coal Company Llc → Black Raven Mine #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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Ronald S  Ratliff → Black Raven Mine #1; 1988-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** El Paso Energy Corp → Black Raven Mine #1; 1989-04-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R S Mining Inc → Black Raven Mine #1; 1993-06-01 to 1994-04-12; source msha-controller-operator-history
- **controller_controls_operator:** Ronald S  Ratliff → R S Mining Inc; 1993-06-01 to 1994-04-12; source msha-controller-operator-history
- **operator_operates_mine:** Pro Mod Mining Company Inc → Black Raven Mine #1; 1994-04-13 to 1996-03-26; source msha-controller-operator-history
- **controller_controls_mine:** Shanks Greg A → Black Raven Mine #1; 1994-04-13 to 1996-03-26; source msha-controller-operator-history
- **controller_controls_operator:** Shanks Greg A → Pro Mod Mining Company Inc; 1994-04-13 to 1996-03-26; source msha-controller-operator-history
- **operator_operates_mine:** Heath Mining Inc → Black Raven Mine #1; 1996-03-27 to 1996-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Stanley W Osborne → Black Raven Mine #1; 1996-03-27 to 1996-09-16; source msha-controller-operator-history
- **controller_controls_operator:** Stanley W Osborne → Heath Mining Inc; 1996-03-27 to 1996-09-16; source msha-controller-operator-history
- **operator_operates_mine:** Coastal Coal Company Llc → Black Raven Mine #1; 1996-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** El Paso Energy Corp → Coastal Coal Company Llc; 1996-09-17 to current/open; source msha-controller-operator-history