# Relationship history for MSHA mine 4609044

Current hierarchy: **Patriot Coal Corporation → Black Walnut Coal Company → Black Walnut No 2**

- 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

- **operator_operates_mine:** Black Walnut Coal Company → Black Walnut No 2; 2004-05-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Peabody Energy Corporation → Black Walnut No 2; 2004-05-17 to 2007-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Peabody Energy Corporation → Black Walnut Coal Company; 2004-05-17 to 2007-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Patriot Coal Corporation → Black Walnut No 2; 2007-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patriot Coal Corporation → Black Walnut Coal Company; 2007-11-01 to current/open; source msha-controller-operator-history