# Relationship history for MSHA mine 0503780

Current hierarchy: **George  Glasier → Pinon Ridge Mining LLC → West Sunday**

- 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

- **controller_controls_mine:** Union Carbide Corp → West Sunday; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tomcat Mining Corporation → West Sunday; 1982-06-01 to 2006-12-03; source msha-controller-operator-history
- **controller_controls_operator:** Union Carbide Corp → Tomcat Mining Corporation; 1982-06-01 to 2006-12-03; source msha-controller-operator-history
- **controller_controls_mine:** International Uranium Corp → West Sunday; 1997-05-10 to 2023-02-12; source msha-controller-operator-history
- **operator_operates_mine:** Energy Fuels Resources (USA) Inc. → West Sunday; 2006-12-04 to 2019-04-29; source msha-controller-operator-history
- **controller_controls_operator:** International Uranium Corp → Energy Fuels Resources (USA) Inc.; 2006-12-04 to 2019-04-29; source msha-controller-operator-history
- **controller_controls_mine:** George  Glasier → West Sunday; 2019-04-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pinon Ridge Mining LLC → West Sunday; 2019-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George  Glasier → Pinon Ridge Mining LLC; 2019-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Energy Fuels Inc → West Sunday; 2023-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Energy Fuels Inc → Energy Fuels Resources (USA) Inc.; 2023-02-13 to 2019-04-29; source msha-controller-operator-history