# Relationship history for MSHA mine 4000010

Current hierarchy: **Vulcan Materials Company → Vulcan Construction Materials, LLC → Springfield 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:** Asarco Inc → Springfield Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Springfield Quarry; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Porter Brown Limestone Company Inc → Springfield Quarry; 1950-01-01 to 1988-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Benton  Brown Sr → Springfield Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Benton  Brown Sr → Porter Brown Limestone Company Inc; 1950-01-01 to 1988-11-30; source msha-controller-operator-history
- **operator_operates_mine:** American Limestone Company Inc → Springfield Quarry; 1988-12-01 to 1999-11-16; source msha-controller-operator-history
- **controller_controls_operator:** Asarco Inc → American Limestone Company Inc; 1988-12-01 to 1999-11-16; source msha-controller-operator-history
- **operator_operates_mine:** American Limestone Company Inc → Springfield Quarry; 1999-11-17 to 2000-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Grupo Mexico S A B de C V → Springfield Quarry; 1999-11-17 to 2000-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Grupo Mexico S A B de C V → American Limestone Company Inc; 1999-11-17 to 2000-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Rinker Materials South Central, Inc. → Springfield Quarry; 2000-07-01 to 2008-02-21; source msha-controller-operator-history
- **controller_controls_mine:** CSR Ltd → Springfield Quarry; 2000-07-01 to 2003-03-31; source msha-controller-operator-history
- **controller_controls_operator:** CSR Ltd → Rinker Materials South Central, Inc.; 2000-07-01 to 2003-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Rinker Group Ltd → Springfield Quarry; 2003-04-01 to 2007-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Rinker Group Ltd → Rinker Materials South Central, Inc.; 2003-04-01 to 2007-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → Springfield Quarry; 2007-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Rinker Materials South Central, Inc.; 2007-07-10 to 2008-02-21; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Springfield Quarry; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ready Mix USA Inc → Springfield Quarry; 2008-01-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Aggregates USA LLC → Springfield Quarry; 2008-02-22 to 2009-04-03; source msha-controller-operator-history
- **controller_controls_operator:** Ready Mix USA Inc → Aggregates USA LLC; 2008-02-22 to 2009-04-03; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Construction Materials, LLC → Springfield Quarry; 2009-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Construction Materials, LLC; 2009-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Construction Materials, LLC; 2009-04-04 to 2007-11-15; source msha-controller-operator-history