# Relationship history for MSHA mine 1000158

Current hierarchy: **Asarco Inc → Asarco Inc → Con-Sil**

- 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

- **controller_controls_mine:** Asarco Inc → Con-Sil; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sunshine Mining Company → Con-Sil; 1950-01-01 to 1980-06-17; source msha-controller-operator-history
- **controller_controls_mine:** Sunshine Mining & Refining Company → Con-Sil; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sunshine Mining & Refining Company → Sunshine Mining Company; 1950-01-01 to 1980-06-17; source msha-controller-operator-history
- **controller_controls_mine:** Hecla Mining Company → Con-Sil; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hecla Mining Company → Con-Sil; 1980-06-18 to 1989-01-11; source msha-controller-operator-history
- **controller_controls_operator:** Hecla Mining Company → Hecla Mining Company; 1980-06-18 to 1989-01-11; source msha-controller-operator-history
- **operator_operates_mine:** Asarco Inc → Con-Sil; 1989-01-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Asarco Inc → Asarco Inc; 1989-01-12 to current/open; source msha-controller-operator-history