# Relationship history for MSHA mine 1518814

Current hierarchy: **Jimmy W  Tackett → Mitac Mining Company LLC → Simpson Branch**

- 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:** Jimmy W  Tackett et al → Simpson Branch; 2003-02-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mitac Mining Company LLC → Simpson Branch; 2004-11-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jimmy W  Tackett et al → Mitac Mining Company LLC; 2004-11-02 to current/open; source msha-controller-operator-history