# Relationship history for MSHA mine 1103084

Current hierarchy: **Amrize Ltd → Amrize Mid-America Inc. → Amrize Joliet S & G Underground Mine # 1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Rein Schultz & Dahl of Illinois Inc  et al → Amrize Joliet S & G Underground Mine # 1; 1950-01-01 to 2006-04-08; source msha-controller-operator-history
- **operator_operates_mine:** American Contract Miners Inc → Amrize Joliet S & G Underground Mine # 1; 2001-05-01 to 2001-10-09; source msha-controller-operator-history
- **controller_controls_mine:** Joseph D  Cooper → Amrize Joliet S & G Underground Mine # 1; 2001-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph D  Cooper → American Contract Miners Inc; 2001-05-01 to 2001-10-09; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Joliet Inc → Amrize Joliet S & G Underground Mine # 1; 2001-10-10 to 2009-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Rein Schultz & Dahl of Illinois Inc  et al → Lafarge Joliet Inc; 2001-10-10 to 2006-04-08; source msha-controller-operator-history
- **controller_controls_operator:** George L Comerford  et al → Lafarge Joliet Inc; 2001-10-10 to 2006-04-08; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Amrize Joliet S & G Underground Mine # 1; 2006-04-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Joliet Inc; 2006-04-09 to 2009-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Amrize Mid-America Inc. → Amrize Joliet S & G Underground Mine # 1; 2009-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Amrize Joliet S & G Underground Mine # 1; 2009-06-01 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Amrize Mid-America Inc.; 2009-06-01 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Amrize Joliet S & G Underground Mine # 1; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize Mid-America Inc.; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Amrize Joliet S & G Underground Mine # 1; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Amrize Mid-America Inc.; 2025-06-23 to current/open; source msha-controller-operator-history