# Relationship history for MSHA mine 2602797

Current hierarchy: **Dennis M  Anderson → North Star Mines, LLC → Big Mike Copper 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:** North Star Mines, LLC → Big Mike Copper Mine; 2017-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dennis M  Anderson → Big Mike Copper Mine; 2017-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis M  Anderson → North Star Mines, LLC; 2017-02-06 to current/open; source msha-controller-operator-history