# Relationship history for MSHA mine 0504518

Current hierarchy: **Amrize Ltd → Amrize West Central Inc. → HOLCIM Greeley 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

- **controller_controls_mine:** Carl V  Hill Jr → HOLCIM Greeley Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Best-Way Paving Company → HOLCIM Greeley Plant; 1993-05-01 to 1998-05-14; source msha-controller-operator-history
- **controller_controls_operator:** Carl V  Hill Jr → Best-Way Paving Company; 1993-05-01 to 1998-05-14; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → HOLCIM Greeley Plant; 1997-05-14 to 2009-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Amrize West Central Inc. → HOLCIM Greeley Plant; 1998-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Amrize West Central Inc.; 1998-05-15 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → HOLCIM Greeley Plant; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize West Central Inc.; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → HOLCIM Greeley Plant; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize West Central Inc.; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → HOLCIM Greeley Plant; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Amrize West Central Inc.; 2025-06-23 to current/open; source msha-controller-operator-history