# Relationship history for MSHA mine 0503561

Current hierarchy: **Van Tiem Richard & Ray Smith → Hard Rock Mining Company → Gold Crest**

- 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:** Hard Rock Mining Company → Gold Crest; 1980-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Van Tiem Richard & Ray Smith → Gold Crest; 1980-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Van Tiem Richard & Ray Smith → Hard Rock Mining Company; 1980-06-01 to current/open; source msha-controller-operator-history