# Relationship history for MSHA mine 0900878

Current hierarchy: **Vulcan Materials Company → Vulcan Construction Materials, LLC → FRIENDSHIP QUARRY**

- 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

- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → FRIENDSHIP QUARRY; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Jim Walter Corp → FRIENDSHIP QUARRY; 1950-01-01 to 1989-05-30; source msha-controller-operator-history
- **operator_operates_mine:** Hall Aggregate Company → FRIENDSHIP QUARRY; 1950-01-01 to 1979-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Roger H  Brown → FRIENDSHIP QUARRY; 1950-01-01 to 1979-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Roger H  Brown → Hall Aggregate Company; 1950-01-01 to 1979-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Georgia Marble Company → FRIENDSHIP QUARRY; 1980-01-01 to 1989-05-30; source msha-controller-operator-history
- **controller_controls_operator:** Jim Walter Corp → Georgia Marble Company; 1980-01-01 to 1989-05-30; source msha-controller-operator-history
- **controller_controls_mine:** Blue Circle Industries Plc → FRIENDSHIP QUARRY; 1987-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Georgia Marble Aggregates Corp → FRIENDSHIP QUARRY; 1989-05-31 to 1989-09-13; source msha-controller-operator-history
- **controller_controls_mine:** Imerys S A → FRIENDSHIP QUARRY; 1989-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Imerys S A → Georgia Marble Aggregates Corp; 1989-05-31 to 1989-09-13; source msha-controller-operator-history
- **operator_operates_mine:** Blue Circle Aggregates Inc → FRIENDSHIP QUARRY; 1989-09-14 to 2001-07-11; source msha-controller-operator-history
- **controller_controls_operator:** Blue Circle Industries Plc → Blue Circle Aggregates Inc; 1989-09-14 to 2001-07-11; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → FRIENDSHIP QUARRY; 2001-07-12 to 2015-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Aggregates Southeast → FRIENDSHIP QUARRY; 2001-07-12 to 2010-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → FRIENDSHIP QUARRY; 2001-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Aggregates Southeast; 2001-07-12 to 2010-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → FRIENDSHIP QUARRY; 2007-11-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Building Materials, Inc. → FRIENDSHIP QUARRY; 2011-01-01 to 2013-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Building Materials, Inc.; 2011-01-01 to 2013-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Construction Materials, LLC → FRIENDSHIP QUARRY; 2013-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Construction Materials, LLC; 2013-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Construction Materials, LLC; 2013-02-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → FRIENDSHIP QUARRY; 2015-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Lafarge Building Materials, Inc.; 2015-07-10 to 2013-01-31; source msha-controller-operator-history