# Relationship history for MSHA mine 4103599

Current hierarchy: **Vulcan Materials Company → Vulcan Construction Materials, LLC → North Amarillo**

- 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

- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → North Amarillo; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Roy P  Eastland III → North Amarillo; 1950-01-01 to 2016-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Texas Sand & Gravel Co Inc → North Amarillo; 1990-03-01 to 2018-03-01; source msha-controller-operator-history
- **controller_controls_operator:** Roy P  Eastland III → Texas Sand & Gravel Co Inc; 1990-03-01 to 2016-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → North Amarillo; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** US Concrete → North Amarillo; 2008-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Craig  Snell → North Amarillo; 2016-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Craig  Snell → Texas Sand & Gravel Co Inc; 2016-06-01 to 2018-03-01; source msha-controller-operator-history
- **operator_operates_mine:** Ingram Concrete, LLC → North Amarillo; 2018-03-02 to 2021-10-31; source msha-controller-operator-history
- **controller_controls_operator:** US Concrete → Ingram Concrete, LLC; 2018-03-02 to 2021-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Construction Materials, LLC → North Amarillo; 2021-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Construction Materials, LLC; 2021-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Construction Materials, LLC; 2021-11-01 to 2007-11-15; source msha-controller-operator-history