# Relationship history for MSHA mine 2302577

Current hierarchy: **Aaron  Vollrath; Robert  Gerke → Nexgen Perryville LLC → Nexgen Silica LLC Perryville**

- 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:** Nexgen Perryville LLC → Nexgen Silica LLC Perryville; 2023-03-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Aaron  Vollrath et al → Nexgen Silica LLC Perryville; 2023-03-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aaron  Vollrath et al → Nexgen Perryville LLC; 2023-03-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Gerke et al → Nexgen Perryville LLC; 2023-03-08 to current/open; source msha-controller-operator-history