# Relationship history for MSHA mine 2902180

Current hierarchy: **Vulcan Materials Company → Calmat Co of NM → Las Lunas Pit**

- 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:** Calmat Company → Las Lunas Pit; 1989-02-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Calmat Company Of New Mexico → Las Lunas Pit; 1998-09-01 to 1999-01-05; source msha-controller-operator-history
- **controller_controls_operator:** Calmat Company → Calmat Company Of New Mexico; 1998-09-01 to 1999-01-05; source msha-controller-operator-history
- **operator_operates_mine:** Calmat Co of NM → Las Lunas Pit; 1999-01-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Las Lunas Pit; 1999-01-06 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Calmat Co of NM; 1999-01-06 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Las Lunas Pit; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Calmat Co of NM; 2007-11-16 to current/open; source msha-controller-operator-history