# Relationship history for MSHA mine 4801366

Current hierarchy: **Uranium Resources Inc → Uranium Resources Inc → North Platte 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:** Nucorp Energy Inc → North Platte Mine; 1978-03-09 to 1982-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Uranium Resources Inc → North Platte Mine; 1982-01-01 to 1982-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Nucorp Energy Inc → Uranium Resources Inc; 1982-01-01 to 1982-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Uranium Resources Inc → North Platte Mine; 1983-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Uranium Resources Inc → North Platte Mine; 1983-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Uranium Resources Inc → Uranium Resources Inc; 1983-01-01 to current/open; source msha-controller-operator-history