# Relationship history for MSHA mine 4606171

Current hierarchy: **Banner Holding Ltd → Banner Coal & Land Company → Magnum 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 → Magnum Mine; 1978-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Banner Coal & Land Company → Magnum Mine; 1980-05-01 to 1986-04-02; source msha-controller-operator-history
- **controller_controls_operator:** White Mountain Mining Co., LLC → Banner Coal & Land Company; 1980-05-01 to 1986-04-02; source msha-controller-operator-history
- **operator_operates_mine:** Banner Coal & Land Company → Magnum Mine; 1986-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Banner Holding Ltd → Magnum Mine; 1986-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Banner Holding Ltd → Banner Coal & Land Company; 1986-04-03 to current/open; source msha-controller-operator-history