# Relationship history for MSHA mine 0202071

Current hierarchy: **Dalton Mack W → Copa De Oro Mining Company Ltd → Copa De Oro Custon Ore Processing Plant**

- 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:** Copa De Oro Mining Company Ltd → Copa De Oro Custon Ore Processing Plant; 1981-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dalton Mack W Et Al → Copa De Oro Custon Ore Processing Plant; 1981-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dalton Mack W Et Al → Copa De Oro Mining Company Ltd; 1981-12-01 to current/open; source msha-controller-operator-history