# Relationship history for MSHA mine 0504263

Current hierarchy: **Pike'S Peak Mining Company & Golden Cycle Gold Cor → Cripple Creek & Victor Gold Mining Company → Portland Open Pit Mine**

- 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:** Pike'S Peak Mining Company & Golden Cycle Gold Cor → Portland Open Pit Mine; 1984-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cripple Creek & Victor Gold Mining Company → Portland Open Pit Mine; 1987-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pike'S Peak Mining Company & Golden Cycle Gold Cor → Cripple Creek & Victor Gold Mining Company; 1987-10-01 to current/open; source msha-controller-operator-history