# Relationship history for MSHA mine 1515751

Current hierarchy: **Cyprus Amax Minerals Company → Bailey Hill Mining Company → Bailey Hill Number 6**

- 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:** Cyprus Amax Minerals Company → Bailey Hill Number 6; 1981-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bailey Hill Mining Company → Bailey Hill Number 6; 1986-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Bailey Hill Mining Company; 1986-09-01 to current/open; source msha-controller-operator-history