# Relationship history for MSHA mine 1601573

Current hierarchy: **Pro Frac Holding Corp → Alpine Silica, LLC → Hat 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Performance Proppants LLC → Hat Creek; 2017-08-24 to 2024-01-31; source msha-controller-operator-history
- **controller_controls_mine:** William G Bowdon et al → Hat Creek; 2017-08-24 to 2023-02-23; source msha-controller-operator-history
- **controller_controls_operator:** William G Bowdon et al → Performance Proppants LLC; 2017-08-24 to 2023-02-23; source msha-controller-operator-history
- **controller_controls_mine:** Wilks Brothers LLC → Hat Creek; 2017-11-13 to 2022-10-09; source msha-controller-operator-history
- **controller_controls_mine:** Pro Frac Holding Corp → Hat Creek; 2022-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pro Frac Holding Corp → Hat Creek; 2023-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pro Frac Holding Corp → Performance Proppants LLC; 2023-02-24 to 2024-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Alpine Silica, LLC → Hat Creek; 2024-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wilks Brothers LLC → Alpine Silica, LLC; 2024-02-01 to 2022-10-09; source msha-controller-operator-history
- **controller_controls_operator:** Pro Frac Holding Corp → Alpine Silica, LLC; 2024-02-01 to current/open; source msha-controller-operator-history