# Relationship history for MSHA mine 0202346

Current hierarchy: **Energy Fuels Inc → Denison Mines (USA) Corp → Canyon 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

- **controller_controls_mine:** Harold  Roberts → Canyon Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Energy Fuels Nuclear Inc → Canyon Mine; 1986-12-01 to 2009-06-25; source msha-controller-operator-history
- **controller_controls_operator:** Harold  Roberts → Energy Fuels Nuclear Inc; 1986-12-01 to 2009-06-25; source msha-controller-operator-history
- **controller_controls_mine:** International Uranium Corp → Canyon Mine; 1997-05-10 to 2023-02-12; source msha-controller-operator-history
- **operator_operates_mine:** Denison Mines (USA) Corp → Canyon Mine; 2009-06-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** International Uranium Corp → Denison Mines (USA) Corp; 2009-06-26 to 2023-02-12; source msha-controller-operator-history
- **controller_controls_mine:** Energy Fuels Inc → Canyon Mine; 2023-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Energy Fuels Inc → Denison Mines (USA) Corp; 2023-02-13 to current/open; source msha-controller-operator-history