# Relationship history for MSHA mine 0100584

Current hierarchy: **Lafarge S A → Lafarge Aggregates Southeast, Inc. → BRICKYARD 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:** Consolidated Gravel & Pipe Company → BRICKYARD PLANT; 1950-01-01 to 1986-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Calhoun Products Inc → BRICKYARD PLANT; 1950-01-01 to 1987-12-01; source msha-controller-operator-history
- **controller_controls_operator:** Calhoun Products Inc → Consolidated Gravel & Pipe Company; 1950-01-01 to 1986-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Blue Circle Aggregates Inc → BRICKYARD PLANT; 1987-01-01 to 2001-07-11; source msha-controller-operator-history
- **controller_controls_mine:** Blue Circle Industries Plc → BRICKYARD PLANT; 1987-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blue Circle Industries Plc → Blue Circle Aggregates Inc; 1987-01-01 to 2001-07-11; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Aggregates Southeast, Inc. → BRICKYARD PLANT; 2001-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → BRICKYARD PLANT; 2001-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Aggregates Southeast, Inc.; 2001-07-12 to current/open; source msha-controller-operator-history