# Relationship history for MSHA mine 3000085

Current hierarchy: **Amrize Ltd → Amrize Great Lakes Inc. → Amrize Niagara Quarry**

- 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:** Niagara Stone Corp → Amrize Niagara Quarry; 1950-01-01 to 1990-07-12; source msha-controller-operator-history
- **controller_controls_mine:** Greater Buffalo Press → Amrize Niagara Quarry; 1950-01-01 to 1990-07-12; source msha-controller-operator-history
- **controller_controls_operator:** Greater Buffalo Press → Niagara Stone Corp; 1950-01-01 to 1990-07-12; source msha-controller-operator-history
- **operator_operates_mine:** Niagara Stone Corp → Amrize Niagara Quarry; 1990-07-13 to 1992-02-29; source msha-controller-operator-history
- **controller_controls_mine:** Steetley PLC → Amrize Niagara Quarry; 1990-07-13 to 1992-02-29; source msha-controller-operator-history
- **controller_controls_operator:** Steetley PLC → Niagara Stone Corp; 1990-07-13 to 1992-02-29; source msha-controller-operator-history
- **operator_operates_mine:** Redland Quarries Ny Inc → Amrize Niagara Quarry; 1992-03-01 to 1998-02-10; source msha-controller-operator-history
- **controller_controls_mine:** Redland Plc → Amrize Niagara Quarry; 1992-03-01 to 1998-02-10; source msha-controller-operator-history
- **controller_controls_operator:** Redland Plc → Redland Quarries Ny Inc; 1992-03-01 to 1998-02-10; source msha-controller-operator-history
- **operator_operates_mine:** Redland Quarries NY Inc. → Amrize Niagara Quarry; 1998-02-11 to 2010-05-03; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Amrize Niagara Quarry; 1998-02-11 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Redland Quarries NY Inc.; 1998-02-11 to 2010-05-03; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Amrize Niagara Quarry; 2009-04-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Mid Atlantic, LLC → Amrize Niagara Quarry; 2010-05-04 to 2010-12-05; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Mid Atlantic, LLC; 2010-05-04 to 2010-12-05; source msha-controller-operator-history
- **operator_operates_mine:** Amrize Great Lakes Inc. → Amrize Niagara Quarry; 2010-12-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Amrize Great Lakes Inc.; 2010-12-06 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Niagara Quarry; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Redland Quarries NY Inc.; 2015-07-10 to 2010-05-03; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize Great Lakes Inc.; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Amrize Niagara Quarry; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Redland Quarries NY Inc.; 2025-06-23 to 2010-05-03; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Amrize Great Lakes Inc.; 2025-06-23 to current/open; source msha-controller-operator-history