# Relationship history for MSHA mine 4201528

Current hierarchy: **Energy Fuels Nuclear Inc → Energy Fuels Nuclear Inc → Bingham Canyon**

- 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

- **controller_controls_mine:** Westinghouse Electric Corp → Bingham Canyon; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Energy Fuels Nuclear Inc → Bingham Canyon; 1978-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Westinghouse Electric Corp → Bingham Canyon; 1978-03-09 to 1986-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Westinghouse Electric Corp → Westinghouse Electric Corp; 1978-03-09 to 1986-09-14; source msha-controller-operator-history
- **operator_operates_mine:** Energy Fuels Nuclear Inc → Bingham Canyon; 1986-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Energy Fuels Nuclear Inc → Energy Fuels Nuclear Inc; 1986-09-15 to current/open; source msha-controller-operator-history