# Relationship history for MSHA mine 1500100

Current hierarchy: **Amrize Ltd → Amrize South Central Inc. → Amrize Three Rivers 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

- **controller_controls_mine:** Martin Marietta Materials Inc → Amrize Three Rivers Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dravo Corp → Amrize Three Rivers Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lattimore Properties Inc → Amrize Three Rivers Quarry; 1950-01-01 to 2011-03-30; source msha-controller-operator-history
- **operator_operates_mine:** Three Rivers Rock Company → Amrize Three Rivers Quarry; 1950-01-01 to 1982-11-02; source msha-controller-operator-history
- **controller_controls_mine:** Harbert Corp → Amrize Three Rivers Quarry; 1950-01-01 to 1982-11-02; source msha-controller-operator-history
- **controller_controls_operator:** Harbert Corp → Three Rivers Rock Company; 1950-01-01 to 1982-11-02; source msha-controller-operator-history
- **operator_operates_mine:** Three Rivers Rock Company → Amrize Three Rivers Quarry; 1982-11-03 to 1988-02-29; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Amax Minerals Company → Amrize Three Rivers Quarry; 1982-11-03 to 1988-02-29; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Three Rivers Rock Company; 1982-11-03 to 1988-02-29; source msha-controller-operator-history
- **operator_operates_mine:** Dravo Basic Materials Company Inc → Amrize Three Rivers Quarry; 1988-03-01 to 1995-01-02; source msha-controller-operator-history
- **controller_controls_operator:** Dravo Corp → Dravo Basic Materials Company Inc; 1988-03-01 to 1995-01-02; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Aggregates → Amrize Three Rivers Quarry; 1995-01-03 to 2005-05-23; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Aggregates; 1995-01-03 to 2005-05-23; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Amrize Three Rivers Quarry; 2002-01-31 to 2015-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials, Inc. → Amrize Three Rivers Quarry; 2005-05-24 to 2011-12-09; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials, Inc.; 2005-05-24 to 2011-12-09; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Amrize Three Rivers Quarry; 2009-06-01 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Three Rivers Quarry; 2011-03-31 to 2015-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge West, Inc → Amrize Three Rivers Quarry; 2011-12-10 to 2018-02-04; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge West, Inc; 2011-12-10 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Three Rivers Quarry; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Three Rivers Quarry; 2015-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Lafarge West, Inc; 2015-07-10 to 2018-02-04; source msha-controller-operator-history
- **operator_operates_mine:** Amrize Mid-America Inc. → Amrize Three Rivers Quarry; 2018-02-05 to 2026-04-14; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize Mid-America Inc.; 2018-02-05 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Amrize Mid-America Inc.; 2018-02-05 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Amrize Three Rivers Quarry; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Amrize Mid-America Inc.; 2025-06-23 to 2026-04-14; source msha-controller-operator-history
- **operator_operates_mine:** Amrize South Central Inc. → Amrize Three Rivers Quarry; 2026-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize South Central Inc.; 2026-04-15 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Amrize South Central Inc.; 2026-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lattimore Properties Inc → Amrize South Central Inc.; 2026-04-15 to 2011-03-30; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize South Central Inc.; 2026-04-15 to 2015-07-09; source msha-controller-operator-history