# Relationship history for MSHA mine 3002236

Current hierarchy: **Horsehead Industries Inc → Njz Mines Inc → Wight 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:** St Joe Resources Company → Wight Mine; 1950-01-01 to 1989-05-29; source msha-controller-operator-history
- **controller_controls_mine:** Fluor Corp → Wight Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fluor Corp → St Joe Resources Company; 1950-01-01 to 1989-05-29; source msha-controller-operator-history
- **operator_operates_mine:** Njz Mines Inc → Wight Mine; 1989-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Horsehead Industries Inc → Wight Mine; 1989-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horsehead Industries Inc → Njz Mines Inc; 1989-05-30 to current/open; source msha-controller-operator-history