# Relationship history for MSHA mine 0503138

Current hierarchy: **Peabody Energy Corporation → Hayden Gulch Terminal LLC → Hayden Gulch Terminal LLC**

- 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

- **operator_operates_mine:** Yampa Mining Company → Hayden Gulch Terminal LLC; 1977-12-01 to 1993-01-07; source msha-controller-operator-history
- **controller_controls_mine:** Washington Group International Inc → Hayden Gulch Terminal LLC; 1977-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Washington Group International Inc → Yampa Mining Company; 1977-12-01 to 1993-01-07; source msha-controller-operator-history
- **operator_operates_mine:** Hayden Gulch Terminal Inc → Hayden Gulch Terminal LLC; 1993-01-08 to 1998-05-18; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Hayden Gulch Terminal LLC; 1993-01-08 to 1998-05-18; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hayden Gulch Terminal Inc; 1993-01-08 to 1998-05-18; source msha-controller-operator-history
- **operator_operates_mine:** Hayden Gulch Terminal LLC → Hayden Gulch Terminal LLC; 1998-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Peabody Energy Corporation → Hayden Gulch Terminal LLC; 1998-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peabody Energy Corporation → Hayden Gulch Terminal LLC; 1998-05-19 to current/open; source msha-controller-operator-history