# Relationship history for MSHA mine 0202458

Current hierarchy: **Cyprus Amax Minerals Company → Cyprus Copperstone Gold Corp → Copperstone 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

- **operator_operates_mine:** Cyprus Copperstone Gold Corp → Copperstone Mine; 1988-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Amax Minerals Company → Copperstone Mine; 1988-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Cyprus Copperstone Gold Corp; 1988-09-01 to current/open; source msha-controller-operator-history