# Relationship history for MSHA mine 3004166

Current hierarchy: **Richard  Mirch → TOMPKINS BLUESTONE COMPANY, INC. → YOUNG QUARRY**

- 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:** Richard  Mirch → YOUNG QUARRY; 2002-05-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tompkins Bluestone Company, Inc. → YOUNG QUARRY; 2025-08-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Mirch → Tompkins Bluestone Company, Inc.; 2025-08-26 to current/open; source msha-controller-operator-history