# Relationship history for MSHA mine 4202663

Current hierarchy: **GMCO Corporation → GMCO Willow Creek, LLC → Willow Creek**

- 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

- **operator_operates_mine:** Willow Creek Salt Company → Willow Creek; 2016-11-09 to 2022-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Jesse  Nielsen → Willow Creek; 2016-11-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jesse  Nielsen → Willow Creek Salt Company; 2016-11-09 to 2022-11-15; source msha-controller-operator-history
- **operator_operates_mine:** GMCO Willow Creek, LLC → Willow Creek; 2022-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** GMCO Corporation → Willow Creek; 2022-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** GMCO Corporation → GMCO Willow Creek, LLC; 2022-11-16 to current/open; source msha-controller-operator-history