# Relationship history for MSHA mine 3200043

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