# Relationship history for MSHA mine 4801144

Current hierarchy: **Rtz-Cra Group & U S Energy/Crested Corp → Green Mountain Mining Venture → Big Eagle 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:** Pathfinder Mines Corp → Big Eagle Mine; 1950-01-01 to 1982-02-28; source msha-controller-operator-history
- **controller_controls_mine:** General Electric Company → Big Eagle Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** General Electric Company → Pathfinder Mines Corp; 1950-01-01 to 1982-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Pathfinder Mines Corp → Big Eagle Mine; 1982-03-01 to 1991-08-18; source msha-controller-operator-history
- **controller_controls_mine:** Cogema S A → Big Eagle Mine; 1982-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cogema S A → Pathfinder Mines Corp; 1982-03-01 to 1991-08-18; source msha-controller-operator-history
- **controller_controls_mine:** Rtz-Cra Group & U S Energy/Crested Corp → Big Eagle Mine; 1987-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Green Mountain Mining Venture → Big Eagle Mine; 1991-08-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rtz-Cra Group & U S Energy/Crested Corp → Green Mountain Mining Venture; 1991-08-19 to current/open; source msha-controller-operator-history