# Relationship history for MSHA mine 2602584

Current hierarchy: **Kinross Gold Corporation → Round Mountain Gold Corporation → Smoky Valley Common Operation-UG**

- 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:** Echo Bay Mines Ltd → Smoky Valley Common Operation-UG; 1950-01-01 to 2003-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Kinross Gold Corporation → Smoky Valley Common Operation-UG; 2003-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Round Mountain Gold Corporation → Smoky Valley Common Operation-UG; 2006-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Echo Bay Mines Ltd → Round Mountain Gold Corporation; 2006-02-27 to 2003-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Kinross Gold Corporation → Round Mountain Gold Corporation; 2006-02-27 to current/open; source msha-controller-operator-history