# Relationship history for MSHA mine 2401668

Current hierarchy: **Oldham Albert → Aurora Creek Mining Company Inc → Aurora Creek 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Aurora Creek Mining Company Inc → Aurora Creek Placer; 1982-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Oldham Albert Et Al → Aurora Creek Placer; 1982-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oldham Albert Et Al → Aurora Creek Mining Company Inc; 1982-05-01 to current/open; source msha-controller-operator-history