# Relationship history for MSHA mine 4608042

Current hierarchy: **White Mountain Mining Co., LLC → Banner Coal & Land Company → Winifrede No 7 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** White Mountain Mining Co., LLC → Winifrede No 7 Mine; 1978-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Banner Holding Ltd → Winifrede No 7 Mine; 1986-04-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Banner Coal & Land Company → Winifrede No 7 Mine; 1991-05-01 to 1992-10-15; source msha-controller-operator-history
- **controller_controls_operator:** Banner Holding Ltd → Banner Coal & Land Company; 1991-05-01 to 1992-10-15; source msha-controller-operator-history
- **operator_operates_mine:** Banner Coal & Land Company → Winifrede No 7 Mine; 1992-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** White Mountain Mining Co., LLC → Banner Coal & Land Company; 1992-10-16 to current/open; source msha-controller-operator-history