# Relationship history for MSHA mine 0200144

Current hierarchy: **Freeport-McMoRan Inc → Freeport-McMoRan Sierrita Ops. → Freeport-McMoRan Sierrita Ops.**

- 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:** Duval Corp → Freeport-McMoRan Sierrita Ops.; 1950-01-01 to 1986-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Pennzoil Company → Freeport-McMoRan Sierrita Ops.; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pennzoil Company → Duval Corp; 1950-01-01 to 1986-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Cyprus Sierrita Corp → Freeport-McMoRan Sierrita Ops.; 1986-04-01 to 1999-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Amax Minerals Company → Freeport-McMoRan Sierrita Ops.; 1986-04-01 to 1999-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Cyprus Sierrita Corp; 1986-04-01 to 1999-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Freeport-McMoRan Sierrita Ops. → Freeport-McMoRan Sierrita Ops.; 2000-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Phelps Dodge Corp → Freeport-McMoRan Sierrita Ops.; 2000-01-01 to 2007-03-18; source msha-controller-operator-history
- **controller_controls_operator:** Phelps Dodge Corp → Freeport-McMoRan Sierrita Ops.; 2000-01-01 to 2007-03-18; source msha-controller-operator-history
- **controller_controls_mine:** Freeport-McMoRan Inc → Freeport-McMoRan Sierrita Ops.; 2007-03-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Freeport-McMoRan Inc → Freeport-McMoRan Sierrita Ops.; 2007-03-19 to current/open; source msha-controller-operator-history