# Relationship history for MSHA mine 4502973

Current hierarchy: **Herdrick David S → Vulcan Mountain Inc → Gold Dike**

- 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:** Vulcan Mountain Inc → Gold Dike; 1982-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Herdrick David S → Gold Dike; 1982-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Herdrick David S → Vulcan Mountain Inc; 1982-09-01 to current/open; source msha-controller-operator-history