# Relationship history for MSHA mine 0301574

Current hierarchy: **Hanna L H → Hanna Resources Inc → Prairie Creek Mine #1**

- 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:** Hanna Resources Inc → Prairie Creek Mine #1; 1984-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hanna L H → Prairie Creek Mine #1; 1984-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanna L H → Hanna Resources Inc; 1984-05-01 to current/open; source msha-controller-operator-history