# Relationship history for MSHA mine 2102974

Current hierarchy: **Amrize Ltd → AMRIZE MID-AMERICA INC. → Amrize Elk River 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

- **controller_controls_mine:** Dave  Blum → Amrize Elk River Plant; 1986-11-01 to 1989-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Ronald M Anderson → Amrize Elk River Plant; 1986-12-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blum Inc → Amrize Elk River Plant; 1988-04-01 to 1989-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Dave  Blum → Blum Inc; 1988-04-01 to 1989-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Northern Con-Agg Inc → Amrize Elk River Plant; 1989-07-01 to 1989-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Ronald M Anderson → Northern Con-Agg Inc; 1989-07-01 to 1989-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Northern Con-Agg Inc → Amrize Elk River Plant; 1989-09-01 to 1995-04-04; source msha-controller-operator-history
- **controller_controls_mine:** Edward A Egan → Amrize Elk River Plant; 1989-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward A Egan → Northern Con-Agg Inc; 1989-09-01 to 1995-04-04; source msha-controller-operator-history
- **controller_controls_mine:** Camas Plc → Amrize Elk River Plant; 1994-09-22 to 1997-05-13; source msha-controller-operator-history
- **operator_operates_mine:** Shiely Company → Amrize Elk River Plant; 1995-04-05 to 1997-05-13; source msha-controller-operator-history
- **controller_controls_operator:** Camas Plc → Shiely Company; 1995-04-05 to 1997-05-13; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Amrize Elk River Plant; 1995-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Camas Minnesota → Amrize Elk River Plant; 1997-05-14 to 2002-03-04; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Camas Minnesota; 1997-05-14 to 2002-03-04; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Amrize Elk River Plant; 2001-06-01 to 2009-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Aggregate Industries → Amrize Elk River Plant; 2002-03-05 to 2003-11-25; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Aggregate Industries; 2002-03-05 to 2003-11-25; source msha-controller-operator-history
- **operator_operates_mine:** Amrize Midwest Inc. → Amrize Elk River Plant; 2003-11-26 to 2026-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Amrize Elk River Plant; 2003-11-26 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Amrize Midwest Inc.; 2003-11-26 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Elk River Plant; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Aggregate Industries; 2009-04-30 to 2003-11-25; 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 Elk River Plant; 2009-06-01 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Elk River Plant; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Aggregate Industries; 2015-07-10 to 2003-11-25; 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 Elk River Plant; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Aggregate Industries; 2025-06-23 to 2003-11-25; 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 Elk River 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