# Relationship history for MSHA mine 5001521

Current hierarchy: **Fithian Robert → Alaska Hardrock Inc → Independence 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

- **operator_operates_mine:** Alaska Hardrock Inc → Independence Mine; 1987-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fithian Robert → Independence Mine; 1987-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fithian Robert → Alaska Hardrock Inc; 1987-06-01 to current/open; source msha-controller-operator-history