# Relationship history for MSHA mine 2601996

Current hierarchy: **Sunshine Mining & Refining Company → Sunshine Precious Metals Inc → 16:1 Mill**

- 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:** Sunshine Mining & Refining Company → 16:1 Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sunshine Mining Company → 16:1 Mill; 1986-12-01 to 1989-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Sunshine Mining & Refining Company → Sunshine Mining Company; 1986-12-01 to 1989-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Zephyr Resources Inc → 16:1 Mill; 1989-07-01 to 1990-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Welsh J D & Associates Inc → 16:1 Mill; 1989-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Welsh J D & Associates Inc → Zephyr Resources Inc; 1989-07-01 to 1990-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Homestead Minerals Corp → 16:1 Mill; 1990-11-01 to 1993-03-01; source msha-controller-operator-history
- **controller_controls_mine:** Art  Wilson → 16:1 Mill; 1990-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Art  Wilson → Homestead Minerals Corp; 1990-11-01 to 1993-03-01; source msha-controller-operator-history
- **operator_operates_mine:** Sunshine Precious Metals Inc → 16:1 Mill; 1993-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sunshine Mining & Refining Company → Sunshine Precious Metals Inc; 1993-03-02 to current/open; source msha-controller-operator-history