# Relationship history for MSHA mine 0200632

Current hierarchy: **Vulcan Materials Company → CalMat Co → SUN CITY 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Arizona Sand & Rock Company → SUN CITY PLANT; 1950-01-01 to 1983-08-31; source msha-controller-operator-history
- **controller_controls_mine:** California Portland Cement Company → SUN CITY PLANT; 1950-01-01 to 1984-10-31; source msha-controller-operator-history
- **controller_controls_operator:** California Portland Cement Company → Arizona Sand & Rock Company; 1950-01-01 to 1983-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Calmat Company Of Arizona → SUN CITY PLANT; 1983-09-01 to 1999-01-05; source msha-controller-operator-history
- **controller_controls_mine:** Calmat Company → SUN CITY PLANT; 1983-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Calmat Company → Calmat Company Of Arizona; 1983-09-01 to 1999-01-05; source msha-controller-operator-history
- **operator_operates_mine:** Calmat Company Of Arizona → SUN CITY PLANT; 1999-01-06 to 2004-01-06; source msha-controller-operator-history
- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → SUN CITY PLANT; 1999-01-06 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Calmat Company Of Arizona; 1999-01-06 to 2004-01-06; source msha-controller-operator-history
- **operator_operates_mine:** CalMat Co → SUN CITY PLANT; 2004-01-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → CalMat Co; 2004-01-07 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → SUN CITY PLANT; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Calmat Company Of Arizona; 2007-11-16 to 2004-01-06; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → CalMat Co; 2007-11-16 to current/open; source msha-controller-operator-history