# Relationship history for MSHA mine 2302239

Current hierarchy: **Eagle Materials Inc → Talon Concrete & Aggregates LLC → COURTNEY RIDGE 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Lafarge S A → COURTNEY RIDGE PLANT; 1987-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Construction Materials → COURTNEY RIDGE PLANT; 2001-05-01 to 2001-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Construction Materials; 2001-05-01 to 2001-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → COURTNEY RIDGE PLANT; 2001-07-12 to 2015-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge North America Inc. → COURTNEY RIDGE PLANT; 2001-09-01 to 2012-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge North America Inc.; 2001-09-01 to 2012-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Talon Concrete & Aggregates LLC → COURTNEY RIDGE PLANT; 2012-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eagle Materials Inc → COURTNEY RIDGE PLANT; 2012-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eagle Materials Inc → Talon Concrete & Aggregates LLC; 2012-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → COURTNEY RIDGE PLANT; 2015-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Lafarge North America Inc.; 2015-07-10 to 2012-11-30; source msha-controller-operator-history