# Relationship history for MSHA mine 4201164

Current hierarchy: **Energy Fuels Inc → Energy Fuels Resources (USA) Inc. → Calliham**

- 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:** Atlas Minerals → Calliham; 1950-01-01 to 1989-05-14; source msha-controller-operator-history
- **controller_controls_mine:** Atlas Corp → Calliham; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Atlas Corp → Atlas Minerals; 1950-01-01 to 1989-05-14; source msha-controller-operator-history
- **controller_controls_mine:** Union Carbide Corp → Calliham; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Umetco Minerals Corp → Calliham; 1989-05-15 to 2012-05-01; source msha-controller-operator-history
- **controller_controls_operator:** Union Carbide Corp → Umetco Minerals Corp; 1989-05-15 to 2012-05-01; source msha-controller-operator-history
- **controller_controls_mine:** International Uranium Corp → Calliham; 1997-05-10 to 2023-02-12; source msha-controller-operator-history
- **controller_controls_mine:** Energy Fuels Incorporated → Calliham; 2006-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Energy Fuels Resources → Calliham; 2012-05-02 to 2013-04-07; source msha-controller-operator-history
- **controller_controls_operator:** Energy Fuels Incorporated → Energy Fuels Resources; 2012-05-02 to 2013-04-07; source msha-controller-operator-history
- **operator_operates_mine:** Energy Fuels Resources (USA) Inc. → Calliham; 2013-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** International Uranium Corp → Energy Fuels Resources (USA) Inc.; 2013-04-08 to 2023-02-12; source msha-controller-operator-history
- **controller_controls_mine:** Energy Fuels Inc → Calliham; 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 current/open; source msha-controller-operator-history