# Relationship history for MSHA mine 2900233

Current hierarchy: **Freeport-McMoRan Inc → Cobre Mining Company → CONTINENTAL U/G COMPLEX**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** U V Industries Inc → CONTINENTAL U/G COMPLEX; 1950-01-01 to 1980-01-22; source msha-controller-operator-history
- **controller_controls_mine:** U V Industries Inc → CONTINENTAL U/G COMPLEX; 1950-01-01 to 1992-12-31; source msha-controller-operator-history
- **controller_controls_operator:** U V Industries Inc → U V Industries Inc; 1950-01-01 to 1980-01-22; source msha-controller-operator-history
- **controller_controls_mine:** NVF Company → CONTINENTAL U/G COMPLEX; 1980-01-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sharon Steel Corp → CONTINENTAL U/G COMPLEX; 1980-01-23 to 1990-12-27; source msha-controller-operator-history
- **controller_controls_operator:** NVF Company → Sharon Steel Corp; 1980-01-23 to 1990-12-27; source msha-controller-operator-history
- **operator_operates_mine:** Bayard Mining Corp → CONTINENTAL U/G COMPLEX; 1990-12-28 to 1992-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Mueller Industries Inc → CONTINENTAL U/G COMPLEX; 1990-12-28 to 1992-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Mueller Industries Inc → Bayard Mining Corp; 1990-12-28 to 1992-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Cobre Mining Company Inc → CONTINENTAL U/G COMPLEX; 1993-01-01 to 1998-02-02; source msha-controller-operator-history
- **controller_controls_mine:** Metallic Ventures Gold Inc → CONTINENTAL U/G COMPLEX; 1993-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Metallic Ventures Gold Inc → Cobre Mining Company Inc; 1993-01-01 to 1998-02-02; source msha-controller-operator-history
- **operator_operates_mine:** Cobre Mining Company → CONTINENTAL U/G COMPLEX; 1998-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Phelps Dodge Corp → CONTINENTAL U/G COMPLEX; 1998-02-03 to 2007-03-18; source msha-controller-operator-history
- **controller_controls_operator:** Phelps Dodge Corp → Cobre Mining Company; 1998-02-03 to 2007-03-18; source msha-controller-operator-history
- **controller_controls_mine:** Freeport-McMoRan Inc → CONTINENTAL U/G COMPLEX; 2007-03-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Freeport-McMoRan Inc → Cobre Mining Company; 2007-03-19 to current/open; source msha-controller-operator-history