# Relationship history for MSHA mine 1000086

Current hierarchy: **Hecla Mining Company → Hecla Silver Valley, Inc. → Star 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:** Hecla Mining Company → Star Mine; 1950-01-01 to 1989-09-11; source msha-controller-operator-history
- **controller_controls_mine:** Hecla Mining Company → Star Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hecla Mining Company → Hecla Mining Company; 1950-01-01 to 1989-09-11; source msha-controller-operator-history
- **operator_operates_mine:** Star Phoenix Mining Company → Star Mine; 1989-09-12 to 2011-06-16; source msha-controller-operator-history
- **controller_controls_mine:** Duval Frank → Star Mine; 1989-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Duval Frank → Star Phoenix Mining Company; 1989-09-12 to 2011-06-16; source msha-controller-operator-history
- **operator_operates_mine:** Hecla Silver Valley, Inc. → Star Mine; 2011-06-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hecla Mining Company → Star Mine; 2011-06-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hecla Mining Company → Hecla Silver Valley, Inc.; 2011-06-17 to current/open; source msha-controller-operator-history