# Relationship history for MSHA mine 2501034

Current hierarchy: **Cameco Corp → Crow Butte Resources Inc → Crow Butte 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Wyoming Fuel Company → Crow Butte Mine; 1985-06-01 to 1986-06-02; source msha-controller-operator-history
- **controller_controls_mine:** Kn Energy Inc → Crow Butte Mine; 1985-06-01 to 1986-06-02; source msha-controller-operator-history
- **controller_controls_operator:** Kn Energy Inc → Wyoming Fuel Company; 1985-06-01 to 1986-06-02; source msha-controller-operator-history
- **operator_operates_mine:** Crow Butte Resources Inc → Crow Butte Mine; 1986-06-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cameco Corp → Crow Butte Mine; 1986-06-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cameco Corp → Crow Butte Resources Inc; 1986-06-03 to current/open; source msha-controller-operator-history