# Relationship history for MSHA mine 2900898

Current hierarchy: **Chevron Corporation → Molycorp Inc → Moly Mill**

- 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:** Molycorp Inc → Moly Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Unocal Corp → Moly Mill; 1950-01-01 to 2005-11-29; source msha-controller-operator-history
- **controller_controls_operator:** Unocal Corp → Molycorp Inc; 1950-01-01 to 2005-11-29; source msha-controller-operator-history
- **controller_controls_mine:** Chevron Corporation → Moly Mill; 2005-11-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chevron Corporation → Molycorp Inc; 2005-11-30 to current/open; source msha-controller-operator-history