# Relationship history for MSHA mine 2402423

Current hierarchy: **GCC SAB de CV → GCC Trident LLC → Black Butte Mine**

- 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:** Holcim Ltd → Black Butte Mine; 2001-12-12 to 2015-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Holcim (US) Inc → Black Butte Mine; 2005-08-31 to 2015-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Holcim (US) Inc; 2005-08-31 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Black Butte Mine; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Holcim (US) Inc; 2015-07-10 to 2015-07-31; source msha-controller-operator-history
- **operator_operates_mine:** CRH US → Black Butte Mine; 2015-08-01 to 2018-06-22; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Black Butte Mine; 2015-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → CRH US; 2015-08-01 to 2018-06-22; source msha-controller-operator-history
- **operator_operates_mine:** GCC Trident LLC → Black Butte Mine; 2018-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** GCC SAB de CV → Black Butte Mine; 2018-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** GCC SAB de CV → GCC Trident LLC; 2018-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Black Butte Mine; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Holcim (US) Inc; 2025-06-23 to 2015-07-31; source msha-controller-operator-history