# Relationship history for MSHA mine 4801404

Current hierarchy: **Cameco Corp → Power Resources Inc → HIGHLAND URANIUM PROJECT**

- 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:** Everest Exploration Inc → HIGHLAND URANIUM PROJECT; 1981-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Everest Minerals Corp → HIGHLAND URANIUM PROJECT; 1984-03-01 to 1989-09-20; source msha-controller-operator-history
- **controller_controls_operator:** Everest Exploration Inc → Everest Minerals Corp; 1984-03-01 to 1989-09-20; source msha-controller-operator-history
- **operator_operates_mine:** Power Resources Inc → HIGHLAND URANIUM PROJECT; 1989-09-21 to 1997-01-12; source msha-controller-operator-history
- **controller_controls_mine:** National Power → HIGHLAND URANIUM PROJECT; 1989-09-21 to 1997-01-12; source msha-controller-operator-history
- **controller_controls_operator:** National Power → Power Resources Inc; 1989-09-21 to 1997-01-12; source msha-controller-operator-history
- **operator_operates_mine:** Power Resources Inc → HIGHLAND URANIUM PROJECT; 1997-01-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cameco Corp → HIGHLAND URANIUM PROJECT; 1997-01-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cameco Corp → Power Resources Inc; 1997-01-13 to current/open; source msha-controller-operator-history