# Relationship history for MSHA mine 0502710

Current hierarchy: **Cyprus Amax Minerals Company → Colorado Yampa Coal Company → Energy #3 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:** Energy Fuels Coal Resources Ltd → Energy #3 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Energy Fuels Corp → Energy #3 Mine; 1975-09-01 to 1982-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Energy Fuels Coal Resources Ltd → Energy Fuels Corp; 1975-09-01 to 1982-10-14; source msha-controller-operator-history
- **controller_controls_mine:** Texaco Inc → Energy #3 Mine; 1982-01-13 to 1985-09-02; source msha-controller-operator-history
- **operator_operates_mine:** Colorado Yampa Coal Company → Energy #3 Mine; 1982-10-15 to 1985-09-02; source msha-controller-operator-history
- **controller_controls_operator:** Texaco Inc → Colorado Yampa Coal Company; 1982-10-15 to 1985-09-02; source msha-controller-operator-history
- **operator_operates_mine:** Colorado Yampa Coal Company → Energy #3 Mine; 1985-09-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Amax Minerals Company → Energy #3 Mine; 1985-09-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Colorado Yampa Coal Company; 1985-09-03 to current/open; source msha-controller-operator-history