# Relationship history for MSHA mine 2400106

Current hierarchy: **Westmoreland Mining Holdings LLC → Westmoreland Savage Mining LLC → Savage 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:** Knife River Corp → Savage Mine; 1950-01-01 to 2001-04-30; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → Savage Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Knife River Corp; 1950-01-01 to 2001-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Westmoreland Savage Mining LLC → Savage Mine; 2001-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Westmoreland Coal Company → Savage Mine; 2001-05-01 to 2019-03-14; source msha-controller-operator-history
- **controller_controls_operator:** Westmoreland Coal Company → Westmoreland Savage Mining LLC; 2001-05-01 to 2019-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Westmoreland Mining Holdings LLC → Savage Mine; 2019-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Westmoreland Mining Holdings LLC → Westmoreland Savage Mining LLC; 2019-03-15 to current/open; source msha-controller-operator-history