# Relationship history for MSHA mine 4801757

Current hierarchy: **Westmoreland Mining Holdings LLC → Westmoreland Haystack Mining LLC → Westmoreland Haystack Mining 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:** Westmoreland Haystack Mining LLC → Westmoreland Haystack Mining LLC; 2011-10-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Peter Kiewit Sons' Inc → Westmoreland Haystack Mining LLC; 2011-10-03 to 2017-01-05; source msha-controller-operator-history
- **controller_controls_operator:** Peter Kiewit Sons' Inc → Westmoreland Haystack Mining LLC; 2011-10-03 to 2017-01-05; source msha-controller-operator-history
- **controller_controls_mine:** Westmoreland Coal Company → Westmoreland Haystack Mining LLC; 2017-01-06 to 2019-03-14; source msha-controller-operator-history
- **controller_controls_operator:** Westmoreland Coal Company → Westmoreland Haystack Mining LLC; 2017-01-06 to 2019-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Westmoreland Mining Holdings LLC → Westmoreland Haystack Mining LLC; 2019-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Westmoreland Mining Holdings LLC → Westmoreland Haystack Mining LLC; 2019-03-15 to current/open; source msha-controller-operator-history