# Relationship history for MSHA mine 2602227

Current hierarchy: **Eierman Conrad R → Desert Gold Inc → Lucky Boy Silica**

- 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:** Eierman Conrad R → Lucky Boy Silica; 1989-10-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Desert Gold Inc → Lucky Boy Silica; 1993-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eierman Conrad R → Desert Gold Inc; 1993-01-01 to current/open; source msha-controller-operator-history