# Relationship history for MSHA mine 0502777

Current hierarchy: **Holcim Ltd → Lafarge West Incorporated → Bluestone Pit**

- 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

- **operator_operates_mine:** Wesley D Conda Inc → Bluestone Pit; 1950-01-01 to 1993-08-04; source msha-controller-operator-history
- **controller_controls_mine:** Nicholas G  Conda  et al → Bluestone Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nicholas G  Conda  et al → Wesley D Conda Inc; 1950-01-01 to 1993-08-04; source msha-controller-operator-history
- **operator_operates_mine:** Bluestone Aggregates Company → Bluestone Pit; 1993-08-05 to 1997-11-24; source msha-controller-operator-history
- **controller_controls_mine:** Inco Ltd → Bluestone Pit; 1993-08-05 to 1997-11-24; source msha-controller-operator-history
- **controller_controls_operator:** Inco Ltd → Bluestone Aggregates Company; 1993-08-05 to 1997-11-24; source msha-controller-operator-history
- **operator_operates_mine:** Bluestone Aggregates Company → Bluestone Pit; 1997-11-25 to 1999-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Texas Industries Inc → Bluestone Pit; 1997-11-25 to 1999-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Texas Industries Inc → Bluestone Aggregates Company; 1997-11-25 to 1999-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Bluestone Pit; 1998-02-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Western Mobile Inc → Bluestone Pit; 1999-03-01 to 2002-01-30; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Western Mobile Inc; 1999-03-01 to 2002-01-30; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge West Incorporated → Bluestone Pit; 2002-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Bluestone Pit; 2002-01-31 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge West Incorporated; 2002-01-31 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Bluestone Pit; 2015-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Lafarge West Incorporated; 2015-07-10 to current/open; source msha-controller-operator-history