# Relationship history for MSHA mine 2602037

Current hierarchy: **Pegasus Gold Inc → Usmx Inc → Green Springs**

- 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:** Usmx Inc → Green Springs; 1988-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pegasus Gold Inc Et Al → Green Springs; 1988-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pegasus Gold Inc Et Al → Usmx Inc; 1988-01-01 to current/open; source msha-controller-operator-history