# Relationship history for MSHA mine 2300196

Current hierarchy: **Amrize Ltd → Lafarge Aggregates Illinois, Inc. → ST CHARLES 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** St Charles Quarry Company → ST CHARLES PLANT; 1950-01-01 to 1986-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Edwin A  Kurtz → ST CHARLES PLANT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edwin A  Kurtz → St Charles Quarry Company; 1950-01-01 to 1986-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Construction Materials → ST CHARLES PLANT; 1987-01-01 to 2001-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → ST CHARLES PLANT; 1987-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Construction Materials; 1987-01-01 to 2001-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → ST CHARLES PLANT; 2001-07-12 to 2015-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge North America Inc. → ST CHARLES PLANT; 2001-09-17 to 2013-01-08; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge North America Inc.; 2001-09-17 to 2013-01-08; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → ST CHARLES PLANT; 2009-06-01 to 2015-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Aggregates Illinois, Inc. → ST CHARLES PLANT; 2013-01-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Aggregates Illinois, Inc.; 2013-01-09 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → ST CHARLES PLANT; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Lafarge Aggregates Illinois, Inc.; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → ST CHARLES PLANT; 2015-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Lafarge North America Inc.; 2015-07-10 to 2013-01-08; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → ST CHARLES PLANT; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Lafarge Aggregates Illinois, Inc.; 2025-06-23 to current/open; source msha-controller-operator-history