# Relationship history for MSHA mine 3800305

Current hierarchy: **Quikrete Holdings Inc. → Quikrete Construction Materials, LLC → HARLEYVILLE MINE & 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

- **operator_operates_mine:** Gifford-Hill Cement Co Of South Carolina → HARLEYVILLE MINE & PLANT; 1950-01-01 to 1991-02-11; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → HARLEYVILLE MINE & PLANT; 1950-01-01 to 1991-02-11; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Gifford-Hill Cement Co Of South Carolina; 1950-01-01 to 1991-02-11; source msha-controller-operator-history
- **controller_controls_mine:** Blue Circle Industries Plc → HARLEYVILLE MINE & PLANT; 1983-05-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blue Circle Cement → HARLEYVILLE MINE & PLANT; 1991-02-12 to 2001-07-11; source msha-controller-operator-history
- **controller_controls_operator:** Blue Circle Industries Plc → Blue Circle Cement; 1991-02-12 to 2001-07-11; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Building Materials Incorporated → HARLEYVILLE MINE & PLANT; 2001-07-12 to 2011-10-02; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → HARLEYVILLE MINE & PLANT; 2001-07-12 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Building Materials Incorporated; 2001-07-12 to 2011-10-02; source msha-controller-operator-history
- **operator_operates_mine:** Quikrete Construction Materials, LLC → HARLEYVILLE MINE & PLANT; 2011-10-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cementos Argos S A → HARLEYVILLE MINE & PLANT; 2011-10-03 to 2023-01-11; source msha-controller-operator-history
- **controller_controls_operator:** Cementos Argos S A → Quikrete Construction Materials, LLC; 2011-10-03 to 2023-01-11; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → HARLEYVILLE MINE & PLANT; 2015-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Lafarge Building Materials Incorporated; 2015-07-10 to 2011-10-02; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → HARLEYVILLE MINE & PLANT; 2023-01-12 to 2025-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Quikrete Construction Materials, LLC; 2023-01-12 to 2025-08-03; source msha-controller-operator-history
- **controller_controls_mine:** Quikrete Holdings Inc. → HARLEYVILLE MINE & PLANT; 2025-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quikrete Holdings Inc. → Quikrete Construction Materials, LLC; 2025-08-04 to current/open; source msha-controller-operator-history