# Relationship history for MSHA mine 4800969

Current hierarchy: **Energy Fuels Inc → Energy Fuels Wyoming Inc → Sheep Mountain 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:** Western Nuclear Inc → Sheep Mountain Mine; 1950-01-01 to 1988-02-07; source msha-controller-operator-history
- **controller_controls_mine:** Phelps Dodge Corp → Sheep Mountain Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Phelps Dodge Corp → Western Nuclear Inc; 1950-01-01 to 1988-02-07; source msha-controller-operator-history
- **operator_operates_mine:** Sheep Mountain Partners → Sheep Mountain Mine; 1988-02-08 to 2015-08-23; source msha-controller-operator-history
- **controller_controls_mine:** Nukem GMBH → Sheep Mountain Mine; 1988-02-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nukem GMBH → Sheep Mountain Partners; 1988-02-08 to 2015-08-23; source msha-controller-operator-history
- **controller_controls_operator:** U S Energy Corp/Crested Corp → Sheep Mountain Partners; 1988-02-08 to 2015-08-23; source msha-controller-operator-history
- **controller_controls_mine:** International Uranium Corp → Sheep Mountain Mine; 1997-05-10 to 2023-02-12; source msha-controller-operator-history
- **operator_operates_mine:** Energy Fuels Resources (USA) Inc. → Sheep Mountain Mine; 2015-08-24 to 2025-02-09; source msha-controller-operator-history
- **controller_controls_operator:** International Uranium Corp → Energy Fuels Resources (USA) Inc.; 2015-08-24 to 2023-02-12; source msha-controller-operator-history
- **controller_controls_mine:** Energy Fuels Inc → Sheep Mountain Mine; 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 2025-02-09; source msha-controller-operator-history
- **operator_operates_mine:** Energy Fuels Wyoming Inc → Sheep Mountain Mine; 2025-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Energy Fuels Inc → Sheep Mountain Mine; 2025-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Energy Fuels Inc → Energy Fuels Wyoming Inc; 2025-02-10 to current/open; source msha-controller-operator-history