# Relationship history for MSHA mine 1600543

Current hierarchy: **Pro Frac Holding Corp → Alpine Silica, LLC → Merryville**

- 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

- **controller_controls_mine:** Texas Industries Inc → Merryville; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Anacoco Sand & Gravel Inc → Merryville; 1950-01-01 to 1980-06-23; source msha-controller-operator-history
- **controller_controls_mine:** George T  LeBlanc → Merryville; 1950-01-01 to 1980-06-23; source msha-controller-operator-history
- **controller_controls_operator:** George T  LeBlanc → Anacoco Sand & Gravel Inc; 1950-01-01 to 1980-06-23; source msha-controller-operator-history
- **operator_operates_mine:** TXI → Merryville; 1980-06-24 to 2004-12-14; source msha-controller-operator-history
- **controller_controls_operator:** Texas Industries Inc → TXI; 1980-06-24 to 2004-12-14; source msha-controller-operator-history
- **controller_controls_mine:** Trinity Industries Inc → Merryville; 1991-12-01 to 2018-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Texas Industries Inc → Merryville; 2004-12-01 to 2014-07-01; source msha-controller-operator-history
- **operator_operates_mine:** TXI Operations LP → Merryville; 2004-12-15 to 2011-04-01; source msha-controller-operator-history
- **controller_controls_operator:** Texas Industries Inc → TXI Operations LP; 2004-12-15 to 2011-04-01; source msha-controller-operator-history
- **operator_operates_mine:** Arcosa Aggregates, Inc. → Merryville; 2011-04-02 to 2022-02-13; source msha-controller-operator-history
- **controller_controls_operator:** Trinity Industries Inc → Arcosa Aggregates, Inc.; 2011-04-02 to 2018-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Merryville; 2014-07-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → TXI Operations LP; 2014-07-02 to 2011-04-01; source msha-controller-operator-history
- **controller_controls_mine:** William G Bowdon et al → Merryville; 2017-08-24 to 2023-02-23; source msha-controller-operator-history
- **controller_controls_mine:** Wilks Brothers LLC → Merryville; 2017-11-13 to 2022-10-09; source msha-controller-operator-history
- **controller_controls_mine:** Arcosa, Inc → Merryville; 2018-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arcosa, Inc → Arcosa Aggregates, Inc.; 2018-11-01 to 2022-02-13; source msha-controller-operator-history
- **operator_operates_mine:** Performance Proppants LLC → Merryville; 2022-02-14 to 2024-01-31; source msha-controller-operator-history
- **controller_controls_operator:** William G Bowdon et al → Performance Proppants LLC; 2022-02-14 to 2023-02-23; source msha-controller-operator-history
- **controller_controls_mine:** Pro Frac Holding Corp → Merryville; 2022-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pro Frac Holding Corp → Merryville; 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 → Merryville; 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