# Relationship history for MSHA mine 3000045

Current hierarchy: **Amrize Ltd → Amrize Great Lakes Inc. → Amrize Lockport 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Flintkote Cement Company → Amrize Lockport Quarry; 1950-01-01 to 1980-04-06; source msha-controller-operator-history
- **controller_controls_mine:** Flintkote Company → Amrize Lockport Quarry; 1950-01-01 to 1980-04-06; source msha-controller-operator-history
- **controller_controls_operator:** Flintkote Company → Flintkote Cement Company; 1950-01-01 to 1980-04-06; source msha-controller-operator-history
- **controller_controls_mine:** Cimenteries Cbr Cementbedrijven → Amrize Lockport Quarry; 1980-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Genstar Stone Products Company → Amrize Lockport Quarry; 1980-04-07 to 1983-12-30; source msha-controller-operator-history
- **controller_controls_operator:** Cimenteries Cbr Cementbedrijven → Genstar Stone Products Company; 1980-04-07 to 1983-12-30; source msha-controller-operator-history
- **operator_operates_mine:** Frontier Stone Inc → Amrize Lockport Quarry; 1983-12-31 to 1997-03-31; source msha-controller-operator-history
- **controller_controls_mine:** David J  Mahar  et al → Amrize Lockport Quarry; 1983-12-31 to 1997-03-31; source msha-controller-operator-history
- **controller_controls_operator:** David J  Mahar  et al → Frontier Stone Inc; 1983-12-31 to 1997-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Redland Frontier Inc → Amrize Lockport Quarry; 1997-04-01 to 1998-02-10; source msha-controller-operator-history
- **controller_controls_mine:** Redland Plc → Amrize Lockport Quarry; 1997-04-01 to 1998-02-10; source msha-controller-operator-history
- **controller_controls_operator:** Redland Plc → Redland Frontier Inc; 1997-04-01 to 1998-02-10; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Amrize Lockport Quarry; 1998-02-11 to 2015-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Redland Frontier Inc → Amrize Lockport Quarry; 1998-02-11 to 2003-03-25; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Amrize Lockport Quarry; 1998-02-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Redland Frontier Inc; 1998-02-11 to 2003-03-25; source msha-controller-operator-history
- **operator_operates_mine:** Redland Quarries NY Inc. → Amrize Lockport Quarry; 2003-03-26 to 2009-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Redland Quarries NY Inc.; 2003-03-26 to 2009-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Amrize Lockport Quarry; 2009-04-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Mid Atlantic, LLC → Amrize Lockport Quarry; 2010-01-01 to 2010-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Mid Atlantic, LLC; 2010-01-01 to 2010-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Amrize Great Lakes Inc. → Amrize Lockport Quarry; 2010-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Amrize Great Lakes Inc.; 2010-12-01 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Lockport 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 2009-12-31; 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 Lockport 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 2009-12-31; 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