# Relationship history for MSHA mine 0503756

Current hierarchy: **Stewart Steve → Stewart Operation & Construction → Oro Plata Mill**

- 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:** De Luche Don → Oro Plata Mill; 1980-08-01 to 1987-07-06; source msha-controller-operator-history
- **operator_operates_mine:** Oro Plata Mining Inc → Oro Plata Mill; 1981-11-01 to 1987-07-06; source msha-controller-operator-history
- **controller_controls_operator:** De Luche Don → Oro Plata Mining Inc; 1981-11-01 to 1987-07-06; source msha-controller-operator-history
- **operator_operates_mine:** Stewart Operation & Construction → Oro Plata Mill; 1987-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stewart Steve → Oro Plata Mill; 1987-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stewart Steve → Stewart Operation & Construction; 1987-07-07 to current/open; source msha-controller-operator-history