# Relationship history for MSHA mine 3100368

Current hierarchy: **Vulcan Materials Company → Vulcan Construction Materials, LLC → Boone 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Boone Quarry; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Maymead Lime Company Inc → Boone Quarry; 1950-01-01 to 1986-12-19; source msha-controller-operator-history
- **controller_controls_mine:** Wiley B  Roark et al → Boone Quarry; 1950-01-01 to 1986-12-19; source msha-controller-operator-history
- **controller_controls_operator:** Wiley B  Roark et al → Maymead Lime Company Inc; 1950-01-01 to 1986-12-19; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Construction Materials, LLC → Boone Quarry; 1986-12-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Construction Materials, LLC; 1986-12-20 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Boone Quarry; 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