# Relationship history for MSHA mine 0203540

Current hierarchy: **Shane R  Madsen → Sierra Mining and Crushing Co LLC → Hayhook LLC dba Hayhook Sand and Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Shane R  Madsen → Hayhook LLC dba Hayhook Sand and Gravel; 2006-08-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sierra Mining and Crushing Co LLC → Hayhook LLC dba Hayhook Sand and Gravel; 2026-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shane R  Madsen → Sierra Mining and Crushing Co LLC; 2026-03-02 to current/open; source msha-controller-operator-history