# Relationship history for MSHA mine 4503336

Current hierarchy: **Kinross Gold Corporation → Echo Bay Exploration Inc. → K-2 Mine Site**

- 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

- **controller_controls_mine:** Echo Bay Mines Ltd → K-2 Mine Site; 1986-11-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Echo Bay Minerals Company → K-2 Mine Site; 1995-01-01 to 2003-08-24; source msha-controller-operator-history
- **controller_controls_operator:** Echo Bay Mines Ltd → Echo Bay Minerals Company; 1995-01-01 to 2003-08-24; source msha-controller-operator-history
- **operator_operates_mine:** Echo Bay Exploration Inc. → K-2 Mine Site; 2003-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kinross Gold Corporation → K-2 Mine Site; 2003-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kinross Gold Corporation → Echo Bay Exploration Inc.; 2003-08-25 to current/open; source msha-controller-operator-history