# Relationship history for MSHA mine 3000006

Current hierarchy: **Amrize Ltd → Amrize Cement Inc. → AMRIZE RAVENA 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:** Atlantic Cement Company Inc → AMRIZE RAVENA PLANT; 1950-01-01 to 1985-05-28; source msha-controller-operator-history
- **controller_controls_mine:** Newmont Corporation → AMRIZE RAVENA PLANT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Newmont Corporation → Atlantic Cement Company Inc; 1950-01-01 to 1985-05-28; source msha-controller-operator-history
- **controller_controls_mine:** Blue Circle Industries Plc → AMRIZE RAVENA PLANT; 1983-05-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blue Circle Cement → AMRIZE RAVENA PLANT; 1985-05-29 to 2001-07-11; source msha-controller-operator-history
- **controller_controls_operator:** Blue Circle Industries Plc → Blue Circle Cement; 1985-05-29 to 2001-07-11; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Building Materials Incorporated → AMRIZE RAVENA PLANT; 2001-07-12 to 2018-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → AMRIZE RAVENA PLANT; 2001-07-12 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Building Materials Incorporated; 2001-07-12 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → AMRIZE RAVENA PLANT; 2001-12-12 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → AMRIZE RAVENA PLANT; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → AMRIZE RAVENA PLANT; 2015-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Lafarge Building Materials Incorporated; 2015-07-10 to 2018-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Amrize Cement Inc. → AMRIZE RAVENA PLANT; 2019-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize Cement Inc.; 2019-01-01 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Amrize Cement Inc.; 2019-01-01 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → AMRIZE RAVENA PLANT; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Amrize Cement Inc.; 2025-06-23 to current/open; source msha-controller-operator-history