# Relationship history for MSHA mine 5001357

Current hierarchy: **Vernon B  Brice → Silver Gulch Quarry LLC → Silver Gulch 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Lewis F  Vondra et al → Silver Gulch Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Yutan Construction Company → Silver Gulch Quarry; 1980-07-01 to 2017-07-05; source msha-controller-operator-history
- **controller_controls_operator:** Lewis F  Vondra et al → Yutan Construction Company; 1980-07-01 to 2017-07-05; source msha-controller-operator-history
- **operator_operates_mine:** Silver Gulch Quarry LLC → Silver Gulch Quarry; 2017-07-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Vernon B  Brice → Silver Gulch Quarry; 2017-07-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vernon B  Brice → Silver Gulch Quarry LLC; 2017-07-06 to current/open; source msha-controller-operator-history