# Relationship history for MSHA mine 4202597

Current hierarchy: **Dusten L  Heugly; Dan W  McKay → MayDay Mining, LLC → MayDay 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

- **operator_operates_mine:** MayDay Mining, LLC → MayDay Mill; 2012-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dusten L  Heugly et al → MayDay Mill; 2012-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dusten L  Heugly et al → MayDay Mining, LLC; 2012-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dan W  McKay et al → MayDay Mining, LLC; 2012-09-17 to current/open; source msha-controller-operator-history