# Relationship history for MSHA mine 1002379

Current hierarchy: **Thomas W Darland → Darland Skid Steer LLC → Arco Pass 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

- **operator_operates_mine:** Darland Skid Steer LLC → Arco Pass Pit; 2025-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas W Darland → Arco Pass Pit; 2025-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas W Darland → Darland Skid Steer LLC; 2025-05-21 to current/open; source msha-controller-operator-history