# Relationship history for MSHA mine 2101702

Current hierarchy: **Amrize Ltd → AMRIZE MID-AMERICA INC. → Amrize Empire 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:** Northwestern Aggregates Inc → Amrize Empire Plant; 1950-01-01 to 1994-04-19; source msha-controller-operator-history
- **controller_controls_mine:** Ray  Skelton → Amrize Empire Plant; 1950-01-01 to 1994-04-19; source msha-controller-operator-history
- **controller_controls_operator:** Ray  Skelton → Northwestern Aggregates Inc; 1950-01-01 to 1994-04-19; source msha-controller-operator-history
- **operator_operates_mine:** Model Stone Company → Amrize Empire Plant; 1994-04-20 to 1995-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Gary  Reiersen et al → Amrize Empire Plant; 1994-04-20 to 1995-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Reiersen et al → Model Stone Company; 1994-04-20 to 1995-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Camas Minnesota → Amrize Empire Plant; 1995-10-01 to 2002-03-04; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Amrize Empire Plant; 1995-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Camas Minnesota; 1995-10-01 to 2002-03-04; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Amrize Empire Plant; 2001-06-01 to 2009-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Aggregate Industries → Amrize Empire Plant; 2002-03-05 to 2004-02-29; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Aggregate Industries; 2002-03-05 to 2004-02-29; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Amrize Empire Plant; 2003-11-26 to 2009-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Amrize Midwest Inc. → Amrize Empire Plant; 2004-03-01 to 2026-04-14; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Amrize Midwest Inc.; 2004-03-01 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Empire Plant; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Aggregate Industries; 2009-04-30 to 2004-02-29; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize Midwest Inc.; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Amrize Empire Plant; 2009-06-01 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Empire Plant; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Aggregate Industries; 2015-07-10 to 2004-02-29; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize Midwest Inc.; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Amrize Empire Plant; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Aggregate Industries; 2025-06-23 to 2004-02-29; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Amrize Midwest Inc.; 2025-06-23 to 2026-04-14; source msha-controller-operator-history
- **operator_operates_mine:** AMRIZE MID-AMERICA INC. → Amrize Empire Plant; 2026-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → AMRIZE MID-AMERICA INC.; 2026-04-15 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → AMRIZE MID-AMERICA INC.; 2026-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → AMRIZE MID-AMERICA INC.; 2026-04-15 to 2015-07-09; source msha-controller-operator-history