# Relationship history for MSHA mine 0302050

Current hierarchy: **Arkansas Specialty Sands LLC → American Silica, LLC → East Cave City Quarry**

- 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:** American Silica, LLC → East Cave City Quarry; 2017-01-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas E  Bronson et al → East Cave City Quarry; 2017-01-12 to 2020-12-01; source msha-controller-operator-history
- **controller_controls_operator:** Thomas E  Bronson et al → American Silica, LLC; 2017-01-12 to 2020-12-01; source msha-controller-operator-history
- **controller_controls_operator:** Dan  Cook et al → American Silica, LLC; 2017-01-12 to 2020-12-01; source msha-controller-operator-history
- **controller_controls_mine:** Dan  Cook → East Cave City Quarry; 2020-12-02 to 2025-11-13; source msha-controller-operator-history
- **controller_controls_operator:** Dan  Cook → American Silica, LLC; 2020-12-02 to 2025-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Arkansas Specialty Sands LLC → East Cave City Quarry; 2025-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arkansas Specialty Sands LLC → American Silica, LLC; 2025-11-14 to current/open; source msha-controller-operator-history