# Relationship history for MSHA mine 3503240

Current hierarchy: **Guon Marvin → Hereford Mining Inc → Pine Creek Sullivan Ranch Placer**

- 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

- **operator_operates_mine:** Hereford Mining Inc → Pine Creek Sullivan Ranch Placer; 1985-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Guon Marvin → Pine Creek Sullivan Ranch Placer; 1985-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Guon Marvin → Hereford Mining Inc; 1985-07-01 to current/open; source msha-controller-operator-history