# Relationship history for MSHA mine 3100096

Current hierarchy: **Vulcan Materials Company → Vulcan Construction Materials, LLC → Gold Hill**

- 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) → Gold Hill; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Young Stone Company Inc → Gold Hill; 1950-01-01 to 1988-07-29; source msha-controller-operator-history
- **controller_controls_mine:** John B  Young → Gold Hill; 1950-01-01 to 1988-07-29; source msha-controller-operator-history
- **controller_controls_operator:** John B  Young → Young Stone Company Inc; 1950-01-01 to 1988-07-29; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Construction Materials, LLC → Gold Hill; 1988-07-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Construction Materials, LLC; 1988-07-30 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Gold Hill; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Construction Materials, LLC; 2007-11-16 to current/open; source msha-controller-operator-history