# Relationship history for MSHA mine 4605728

Current hierarchy: **White Mountain Mining Co., LLC → Banner Coal & Land Company → Banner No 1**

- 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:** Banner Coal & Land Company → Banner No 1; 1978-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** White Mountain Mining Co., LLC → Banner No 1; 1978-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** White Mountain Mining Co., LLC → Banner Coal & Land Company; 1978-02-01 to current/open; source msha-controller-operator-history