# Relationship history for MSHA mine 3800715

Current hierarchy: **Quikrete Construction Materials, LLC → Georgia Stone Products, LLC → Georgia Stone, Buckhorn Plant**

- 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

- **controller_controls_mine:** Summit Materials LLC → Georgia Stone, Buckhorn Plant; 1950-01-01 to 2022-05-13; source msha-controller-operator-history
- **controller_controls_mine:** Gary (Tim)  Bizzell  et al → Georgia Stone, Buckhorn Plant; 1999-11-02 to 2016-02-04; source msha-controller-operator-history
- **operator_operates_mine:** Buckhorn Materials LLC → Georgia Stone, Buckhorn Plant; 2007-01-10 to 2014-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Joseph H  Anderson et al → Georgia Stone, Buckhorn Plant; 2007-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph H  Anderson et al → Buckhorn Materials LLC; 2007-01-10 to 2014-06-29; source msha-controller-operator-history
- **operator_operates_mine:** Buckhorn Materials LLC → Georgia Stone, Buckhorn Plant; 2014-06-30 to 2016-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Buckhorn Materials LLC; 2014-06-30 to 2016-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Georgia Stone, Buckhorn Plant; 2016-02-05 to 2025-08-03; source msha-controller-operator-history
- **operator_operates_mine:** American Materials Company, LLC → Georgia Stone, Buckhorn Plant; 2017-01-01 to 2021-02-14; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → American Materials Company, LLC; 2017-01-01 to 2021-02-14; source msha-controller-operator-history
- **controller_controls_operator:** Gary (Tim)  Bizzell  et al → American Materials Company, LLC; 2017-01-01 to 2016-02-04; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Georgia Stone, Buckhorn Plant; 2017-08-04 to 2025-02-09; source msha-controller-operator-history
- **operator_operates_mine:** Georgia Stone Products, LLC → Georgia Stone, Buckhorn Plant; 2021-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Georgia Stone Products, LLC; 2021-02-15 to 2025-02-09; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Georgia Stone, Buckhorn Plant; 2022-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Buckhorn Materials LLC; 2022-05-14 to 2016-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Quikrete Construction Materials, LLC → Georgia Stone, Buckhorn Plant; 2025-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quikrete Construction Materials, LLC → Georgia Stone Products, LLC; 2025-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Quikrete Holdings Inc. → Georgia Stone, Buckhorn Plant; 2025-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quikrete Holdings Inc. → American Materials Company, LLC; 2025-08-04 to 2021-02-14; source msha-controller-operator-history