# Relationship history for MSHA mine 4105806

Current hierarchy: **HC Mining Holdings LLC → HC Mining, LLC → Houghton Ranch Location**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** HC Mining, LLC → Houghton Ranch Location; 2025-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** HC Mining Holdings LLC → Houghton Ranch Location; 2025-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** HC Mining Holdings LLC → HC Mining, LLC; 2025-06-12 to current/open; source msha-controller-operator-history