# Relationship history for MSHA mine 4103876

Current hierarchy: **Zack  Burkett III → Zack Burkett Company → Smith 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:** Zack  Burkett III → Smith Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Young County Sand & Gravel Limited → Smith Pit; 1995-10-01 to 2005-11-09; source msha-controller-operator-history
- **controller_controls_mine:** Mark  McClelland et al → Smith Pit; 1995-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  McClelland et al → Young County Sand & Gravel Limited; 1995-10-01 to 2005-11-09; source msha-controller-operator-history
- **controller_controls_operator:** Derel  Tatum et al → Young County Sand & Gravel Limited; 1995-10-01 to 2005-11-09; source msha-controller-operator-history
- **operator_operates_mine:** Zack Burkett Company → Smith Pit; 2005-11-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zack  Burkett III → Zack Burkett Company; 2005-11-10 to current/open; source msha-controller-operator-history