# Relationship history for MSHA mine 4606284

Current hierarchy: **R Bruce  Ferguson; James S  Ferguson → Lexie Coal Corp → Mine No 8a**

- 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:** El Paso Energy Corp → Mine No 8a; 1980-08-01 to 1996-03-10; source msha-controller-operator-history
- **operator_operates_mine:** Brooks Run Coal Company → Mine No 8a; 1981-01-01 to 1981-09-11; source msha-controller-operator-history
- **controller_controls_operator:** El Paso Energy Corp → Brooks Run Coal Company; 1981-01-01 to 1981-09-11; source msha-controller-operator-history
- **operator_operates_mine:** Lexie Coal Corp → Mine No 8a; 1981-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James S  Ferguson et al → Mine No 8a; 1981-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James S  Ferguson et al → Lexie Coal Corp; 1981-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** R Bruce  Ferguson et al → Lexie Coal Corp; 1981-09-12 to current/open; source msha-controller-operator-history