# Relationship history for MSHA mine 0203077

Current hierarchy: **Jaime  Gandara → Sierra Metals Inc. → Phelphs Dodge Morenci, Inc.**

- 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:** Sierra Metals Inc. → Phelphs Dodge Morenci, Inc.; 2005-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jaime  Gandara → Phelphs Dodge Morenci, Inc.; 2005-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jaime  Gandara → Sierra Metals Inc.; 2005-02-22 to current/open; source msha-controller-operator-history