# Relationship history for MSHA mine 1101245

Current hierarchy: **Amrize Ltd → Holcim - MAMR, Inc. → Holcim Sheridan 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:** Lafarge Western of Illinois Inc → Holcim Sheridan Plant; 1950-01-01 to 2009-11-01; source msha-controller-operator-history
- **controller_controls_mine:** Lyle C  Sitterly Jr → Holcim Sheridan Plant; 1950-01-01 to 2006-10-05; source msha-controller-operator-history
- **controller_controls_operator:** Lyle C  Sitterly Jr → Lafarge Western of Illinois Inc; 1950-01-01 to 2006-10-05; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Holcim Sheridan Plant; 2006-10-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Western of Illinois Inc; 2006-10-06 to 2009-11-01; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Holcim Sheridan Plant; 2009-06-01 to 2015-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Holcim - MAMR, Inc. → Holcim Sheridan Plant; 2009-11-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Holcim - MAMR, Inc.; 2009-11-02 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Holcim Sheridan Plant; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Holcim - MAMR, Inc.; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Holcim Sheridan Plant; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Holcim - MAMR, Inc.; 2025-06-23 to current/open; source msha-controller-operator-history