# Relationship history for MSHA mine 4801148

Current hierarchy: **Cogema S A → Cogema Mining Inc → IRIGARAY/CHRISTENSEN PROJECT**

- 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:** Westinghouse Electric Corp → IRIGARAY/CHRISTENSEN PROJECT; 1950-01-01 to 1987-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Westinghouse Electric Corp → IRIGARAY/CHRISTENSEN PROJECT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Westinghouse Electric Corp → Westinghouse Electric Corp; 1950-01-01 to 1987-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Pinnacle West Capital Corp → IRIGARAY/CHRISTENSEN PROJECT; 1986-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Total Compagnie Francaise Des Petroles → IRIGARAY/CHRISTENSEN PROJECT; 1987-05-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Malapai Resources Company → IRIGARAY/CHRISTENSEN PROJECT; 1987-06-15 to 1990-09-19; source msha-controller-operator-history
- **controller_controls_operator:** Pinnacle West Capital Corp → Malapai Resources Company; 1987-06-15 to 1990-09-19; source msha-controller-operator-history
- **operator_operates_mine:** Total Minerals Corp → IRIGARAY/CHRISTENSEN PROJECT; 1990-09-20 to 1993-11-14; source msha-controller-operator-history
- **controller_controls_operator:** Total Compagnie Francaise Des Petroles → Total Minerals Corp; 1990-09-20 to 1993-11-14; source msha-controller-operator-history
- **operator_operates_mine:** Cogema Mining Inc → IRIGARAY/CHRISTENSEN PROJECT; 1993-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cogema S A → IRIGARAY/CHRISTENSEN PROJECT; 1993-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cogema S A → Cogema Mining Inc; 1993-11-15 to current/open; source msha-controller-operator-history