# Relationship history for MSHA mine 0402834

Current hierarchy: **Rio Tinto Group → U S Borax Inc → Owens Lake Mine**

- 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

- **controller_controls_mine:** Rio Tinto Group → Owens Lake Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lake Minerals Corp → Owens Lake Mine; 1950-01-01 to 1981-09-17; source msha-controller-operator-history
- **controller_controls_mine:** C W  Mc Clung → Owens Lake Mine; 1950-01-01 to 1981-09-17; source msha-controller-operator-history
- **controller_controls_operator:** C W  Mc Clung → Lake Minerals Corp; 1950-01-01 to 1981-09-17; source msha-controller-operator-history
- **operator_operates_mine:** Lake Minerals Corp → Owens Lake Mine; 1981-09-18 to 1999-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Teck Resources Limited → Owens Lake Mine; 1981-09-18 to 1999-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Teck Resources Limited → Lake Minerals Corp; 1981-09-18 to 1999-04-30; source msha-controller-operator-history
- **operator_operates_mine:** U S Borax Inc → Owens Lake Mine; 1999-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rio Tinto Group → U S Borax Inc; 1999-05-01 to current/open; source msha-controller-operator-history