# Relationship history for MSHA mine 0500413

Current hierarchy: **Hecla Mining Company → Rio Grande Silver, Inc. → Bulldog 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:** Homestake Mining Company → Bulldog Mine; 1950-01-01 to 2011-11-28; source msha-controller-operator-history
- **controller_controls_mine:** Homestake Mining Company → Bulldog Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Homestake Mining Company → Homestake Mining Company; 1950-01-01 to 2011-11-28; source msha-controller-operator-history
- **controller_controls_mine:** Hecla Mining Company → Bulldog Mine; 2011-05-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rio Grande Silver, Inc. → Bulldog Mine; 2011-11-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hecla Mining Company → Rio Grande Silver, Inc.; 2011-11-29 to current/open; source msha-controller-operator-history