# Relationship history for MSHA mine 0200498

Current hierarchy: **Freeport-McMoRan Inc → Cyprus Tohono Corp → Cyprus Tohono Corporation**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Hecla Mining Company → Cyprus Tohono Corporation; 1950-01-01 to 1979-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Hecla Mining Company → Cyprus Tohono Corporation; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hecla Mining Company → Hecla Mining Company; 1950-01-01 to 1979-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Noranda Lakeshore Mines Inc → Cyprus Tohono Corporation; 1979-04-01 to 1987-07-23; source msha-controller-operator-history
- **controller_controls_mine:** Noranda Inc → Cyprus Tohono Corporation; 1979-04-01 to 1987-07-23; source msha-controller-operator-history
- **controller_controls_operator:** Noranda Inc → Noranda Lakeshore Mines Inc; 1979-04-01 to 1987-07-23; source msha-controller-operator-history
- **operator_operates_mine:** Cyprus Tohono Corp → Cyprus Tohono Corporation; 1987-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Amax Minerals Company → Cyprus Tohono Corporation; 1987-07-24 to 2002-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Cyprus Tohono Corp; 1987-07-24 to 2002-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Phelps Dodge Corp → Cyprus Tohono Corporation; 2002-05-01 to 2007-03-18; source msha-controller-operator-history
- **controller_controls_operator:** Phelps Dodge Corp → Cyprus Tohono Corp; 2002-05-01 to 2007-03-18; source msha-controller-operator-history
- **controller_controls_mine:** Freeport-McMoRan Inc → Cyprus Tohono Corporation; 2007-03-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Freeport-McMoRan Inc → Cyprus Tohono Corp; 2007-03-19 to current/open; source msha-controller-operator-history