# Relationship history for MSHA mine 3609610

Current hierarchy: **Ryan L Ruark → ENDLESS MOUNTAIN MINERALS, LLC → MDA & Corbin Quarries**

- 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

- **controller_controls_mine:** William M  Ruark → MDA & Corbin Quarries; 1987-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert A  Coleman → MDA & Corbin Quarries; 1996-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Endless Mountain Stone Co → MDA & Corbin Quarries; 2008-04-16 to 2022-05-08; source msha-controller-operator-history
- **controller_controls_operator:** Robert A  Coleman → Endless Mountain Stone Co; 2008-04-16 to 2022-05-08; source msha-controller-operator-history
- **operator_operates_mine:** Meshoppen Stone, Inc. → MDA & Corbin Quarries; 2022-05-09 to 2022-05-09; source msha-controller-operator-history
- **controller_controls_operator:** William M  Ruark → Meshoppen Stone, Inc.; 2022-05-09 to 2022-05-09; source msha-controller-operator-history
- **operator_operates_mine:** ENDLESS MOUNTAIN MINERALS, LLC → MDA & Corbin Quarries; 2022-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ryan L Ruark → MDA & Corbin Quarries; 2022-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ryan L Ruark → ENDLESS MOUNTAIN MINERALS, LLC; 2022-05-10 to current/open; source msha-controller-operator-history