# Relationship history for MSHA mine 4607440

Current hierarchy: **Hall Dale → Elk River Resources → Auger Mine #3**

- 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:** Hall Dale → Auger Mine #3; 1987-10-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Elk River Resources → Auger Mine #3; 1988-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hall Dale → Elk River Resources; 1988-01-01 to current/open; source msha-controller-operator-history