# Relationship history for MSHA mine 2400910

Current hierarchy: **Westmoreland Mining Holdings LLC → Westmoreland Absaloka Mining LLC → Absaloka Mine**

- 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:** Washington Group International, Inc. → Absaloka Mine; 1950-01-01 to 2007-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Washington Group International Inc → Absaloka Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Washington Group International Inc → Washington Group International, Inc.; 1950-01-01 to 2007-03-29; source msha-controller-operator-history
- **operator_operates_mine:** Westmoreland Absaloka Mining LLC → Absaloka Mine; 2007-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Westmoreland Coal Company → Absaloka Mine; 2007-03-30 to 2019-03-14; source msha-controller-operator-history
- **controller_controls_operator:** Westmoreland Coal Company → Westmoreland Absaloka Mining LLC; 2007-03-30 to 2019-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Westmoreland Mining Holdings LLC → Absaloka Mine; 2019-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Westmoreland Mining Holdings LLC → Westmoreland Absaloka Mining LLC; 2019-03-15 to current/open; source msha-controller-operator-history