# Relationship history for MSHA mine 0503152

Current hierarchy: **Anfield Energy Inc → Highbury Resources Inc → C-SM-18**

- 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:** Commonwealth Edison Company → C-SM-18; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cotter Corp → C-SM-18; 1978-03-09 to 2000-02-17; source msha-controller-operator-history
- **controller_controls_operator:** Commonwealth Edison Company → Cotter Corp; 1978-03-09 to 2000-02-17; source msha-controller-operator-history
- **operator_operates_mine:** Cotter Corp → C-SM-18; 2000-02-18 to 2005-02-01; source msha-controller-operator-history
- **controller_controls_mine:** General Atomics Uranium Resources → C-SM-18; 2000-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** General Atomics Uranium Resources → Cotter Corp; 2000-02-18 to 2005-02-01; source msha-controller-operator-history
- **operator_operates_mine:** Tomcat Mining Corporation → C-SM-18; 2005-02-02 to 2010-12-19; source msha-controller-operator-history
- **controller_controls_mine:** Dianna L  Reams → C-SM-18; 2005-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dianna L  Reams → Tomcat Mining Corporation; 2005-02-02 to 2010-12-19; source msha-controller-operator-history
- **operator_operates_mine:** Cotter Corporation → C-SM-18; 2010-12-20 to 2025-06-24; source msha-controller-operator-history
- **controller_controls_operator:** General Atomics Uranium Resources → Cotter Corporation; 2010-12-20 to 2025-06-24; source msha-controller-operator-history
- **operator_operates_mine:** Highbury Resources Inc → C-SM-18; 2025-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Anfield Energy Inc → C-SM-18; 2025-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Anfield Energy Inc → Highbury Resources Inc; 2025-06-25 to current/open; source msha-controller-operator-history