# Relationship history for MSHA mine 0300479

Current hierarchy: **US Vanadium Holding Company, LLC → US Vanadium, LLC → US Vanadium, 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Umetco Minerals Corp → US Vanadium, LLC; 1950-01-01 to 1986-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Union Carbide Corp → US Vanadium, LLC; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Union Carbide Corp → Umetco Minerals Corp; 1950-01-01 to 1986-06-30; source msha-controller-operator-history
- **operator_operates_mine:** US Vanadium, LLC → US Vanadium, LLC; 1986-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Strategic Minerals Corp (Stratcor) → US Vanadium, LLC; 1986-07-01 to 2010-11-18; source msha-controller-operator-history
- **controller_controls_operator:** Strategic Minerals Corp (Stratcor) → US Vanadium, LLC; 1986-07-01 to 2010-11-18; source msha-controller-operator-history
- **controller_controls_mine:** Evraz PLC → US Vanadium, LLC; 2010-11-19 to 2019-10-10; source msha-controller-operator-history
- **controller_controls_operator:** Evraz PLC → US Vanadium, LLC; 2010-11-19 to 2019-10-10; source msha-controller-operator-history
- **controller_controls_mine:** US Vanadium Holding Company, LLC → US Vanadium, LLC; 2019-10-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** US Vanadium Holding Company, LLC → US Vanadium, LLC; 2019-10-11 to current/open; source msha-controller-operator-history