# Relationship history for MSHA mine 2302011

Current hierarchy: **Holcim Ltd → Lafarge North America Inc → WARRENTON UNDERGROUND**

- 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:** Don E  LaBrayere → WARRENTON UNDERGROUND; 1979-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → WARRENTON UNDERGROUND; 1987-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Missouri Portable Stone Inc → WARRENTON UNDERGROUND; 1990-01-01 to 1992-12-28; source msha-controller-operator-history
- **controller_controls_mine:** John H Berra Construction Co → WARRENTON UNDERGROUND; 1990-01-01 to 1992-12-28; source msha-controller-operator-history
- **controller_controls_operator:** John H Berra Construction Co → Missouri Portable Stone Inc; 1990-01-01 to 1992-12-28; source msha-controller-operator-history
- **operator_operates_mine:** Missouri Portable Stone Inc → WARRENTON UNDERGROUND; 1992-12-29 to 1997-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Don E  LaBrayere → Missouri Portable Stone Inc; 1992-12-29 to 1997-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Construction Materials → WARRENTON UNDERGROUND; 1998-01-01 to 2001-09-16; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Construction Materials; 1998-01-01 to 2001-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → WARRENTON UNDERGROUND; 2001-07-12 to 2015-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge North America Inc → WARRENTON UNDERGROUND; 2001-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge North America Inc; 2001-09-17 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → WARRENTON UNDERGROUND; 2015-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Lafarge North America Inc; 2015-07-10 to current/open; source msha-controller-operator-history